Chapter 27: Overview of Model Tax Conventions (OECD, UN & US Models) | CA Final DT Notes

27.1 Introduction & The Need for Model Tax Conventions

Historical Evolution, Standardization, and the Three Leading Model Tax Conventions

Foundations

In an increasingly interconnected global economy, cross-border commercial transactions, multinational investments, and digital service deliveries inevitably trigger concurrent tax claims by multiple sovereign jurisdictions. In order to enable sovereign nations to enter into bilateral Double Taxation Avoidance Agreements (DTAAs) that are uniform, predictable, and standardized, international bodies have developed Model Tax Conventions.

Why Do Countries Need Model Tax Conventions?

Negotiating bilateral tax treaties entirely from scratch between two independent sovereign states would be an extraordinarily complex, protracted, and legally fragmented process. Model Tax Conventions fulfill critical international functions:

Harmonized Starting Template: They provide a structured, internationally recognized baseline text and uniform standard legal phraseology for bilateral negotiations.
Standardized Distributive Rules: They establish common allocation rules determining which state (Residence or Source) possesses the primary or exclusive right to tax specific categories of cross-border income (e.g., business profits, dividends, interest, royalties, capital gains).
Consistent Legal Interpretation: Accompanying official Commentaries (by the OECD and UN) provide authoritative guidance, reducing cross-border interpretive conflicts and treaty disputes.
Mitigation of Economic & Juridical Double Taxation: They formulate standardized relief mechanisms (Exemption and Foreign Tax Credit methods) to ensure enterprise income is not subjected to confiscatory double taxation.

The Three Significant Model Tax Conventions

OECD Model Convention • UN Model Convention (2025 Update) • US Model Convention

Comparative Overview

International treaty practice is overwhelmingly dominated by three model conventions. While they share common architectural roots dating back to the League of Nations, they reflect distinct economic philosophies and sovereign priorities:

1. OECD Model Convention

OECD MC (2025) 32 Articles • VII Chapters

Historical Lineage: Commenced under the League of Nations in 1921. The first model bilateral convention was drafted in 1928, refined under the OEEC (1956–1961), formalized as the OECD Model in 1963/1977, and updated continuously (latest comprehensive update in 2025).
Core Philosophy: Developed primarily in the context of capital-exporting, industrialized OECD member states.
Taxing Rights Bias: Places relatively greater emphasis on Residence-State taxation, seeking to minimize or eliminate withholding taxes at source on passive income (e.g., zero source taxation on royalties under Article 12) and restricting Source-State taxing rights over business profits strictly to fixed physical PEs.

2. UN Model Convention

UN MC (Sept 2025) 31 Articles • VII Chapters

Historical Lineage: Initiated in 1968 by an Ad Hoc Group of Experts appointed by the UN ECOSOC. First published in 1980, with major updates in 2001, 2011, 2017, 2021, and the landmark March 2025 session (published September 2025).
Milestone 2025 Title Amendment: The words “between Developed and Developing Countries” were formally deleted from its title in 2025, cementing its status as a universally applicable global convention.
Core Philosophy: Generally favors the retention of greater Source-State taxing rights to safeguard the tax base of capital-importing developing nations.
Balanced Approach (The 3 Corollaries):
1. Foreign capital taxation must factor in allocable expenses incurred in earning the income;
2. Tax rates must not be so excessively high as to discourage inbound foreign investment; and
3. Revenue must be appropriately shared between source and capital-providing states.

3. US Model Convention

US MC US Bilateral Practice

Origin & Scope: Drafted and published periodically by the United States Department of the Treasury. Serves as the official baseline text whenever the United States negotiates bilateral income tax treaties with foreign nations.
Citizenship-Based Taxation: Uniquely accommodates the United States' domestic system of taxing its citizens on their worldwide income regardless of their foreign residence, enforced through robust Saving Clauses.
Limitation on Benefits (LOB): Features an exceptionally comprehensive, objective, multi-pronged anti-treaty shopping article (Article 22 LOB) designed to deny treaty perks to third-country conduit entities.

Master Article-by-Article Comparison: OECD (2025) vs. UN (2025)

Exhaustive Structural Mapping Across All VII Chapters

2025 Updates Incorporated

The OECD Model Convention (2025) contains VII Chapters comprising 32 Articles. The UN Model Convention (2025) also contains VII Chapters comprising 31 Articles. The statutory comparative inventory across all 32/31 articles is set out below:

Article #	OECD Model Convention (2025)	UN Model Convention (2025)	Key Divergence & 2025 Structural Amendments
CHAPTER I: SCOPE OF THE CONVENTION
Article 1	Persons covered	Persons covered	UN Model 2025 inserted a new Article 1(3) Subject-to-Tax Rule (STTR) addressing low-taxed income. Saving clause renumbered to Art. 1(4).
Article 2	Taxes covered	Taxes covered	Substantially identical. Covers taxes on income and capital imposed on behalf of a Contracting State or its political subdivisions/local authorities.
CHAPTER II: DEFINITIONS
Article 3	General definitions	General definitions	Defines "person", "company", "enterprise", "international traffic", and "competent authority". Identical ambulatory interpretation rule under Art. 3(2).
Article 4	Resident	Resident	UN Model explicitly includes "place of incorporation" in paragraph 1. Dual-resident individuals resolved via 5-tier tie-breaker; non-individuals via MAP.
Article 5	Permanent establishment	Permanent establishment	UN Model has shorter building site threshold (6 months vs OECD 12 months), explicit Service PE (Art. 5(3)(b)), and delivery agent PE. Former Insurance PE (Art. 5(6)) deleted in UN 2025.
Article 5A	[No corresponding Article]	Income from exploration for, or exploitation of, natural resources	Specific UN Model provision allowing Source State to tax income derived from offshore natural resource extraction and related activities.
CHAPTER III: TAXATION OF INCOME
Article 6	Income from immovable property	Income from immovable property	Identical. Full, unrestricted right of taxation given to the State where the immovable property is situated (situs state).
Article 7	Business profits	Business profits	OECD permits taxation only of profits directly attributable to the PE. UN Model applies the Force of Attraction (FOA) Rule, taxing direct sales of similar goods or similar business activities.
Article 8	International shipping and air transport	International shipping and air transport (Alternatives A & B)	OECD grants exclusive taxing right to the Residence State. UN Model provides Alternative A (residence exclusive) and Alternative B (source state taxes regular shipping if more than casual).
Article 9	Associated enterprises	Associated enterprises	Identical arm's length transfer pricing adjustment and corresponding relief mechanisms.
Article 10	Dividends	Dividends	Shared taxing rights with source withholding ceiling. UN Model provides lower withholding thresholds for direct corporate shareholdings (e.g. 10% or 25%).
Article 11	Interest	Interest	Shared taxing rights with source withholding ceiling. Broad definition of debt-claims. Late payment penalty charges excluded in both models.
Article 12	Royalties	Royalties	Major divergence: OECD grants exclusive taxing rights to Residence State. UN provides shared taxing rights with source withholding. UN 2025 added sub-paragraph (c) for software!
Article 12A	[No corresponding Article]	Fees for Technical Services Deleted 2025	Formerly introduced in 2017 UN Model. Deleted in 2025 upon being superseded by the broader Article 12AA regime!
Article 12AA	[No corresponding Article]	Fees for services New 2025	Comprehensive new UN Article providing source taxation on all cross-border service fees (not restricted to technical/managerial/consultancy). Replaces deleted Arts. 12A & 14.
Article 12B	[No corresponding Article]	Income from automated digital services (ADS)	Preserves Source-State taxing rights over digital business models (9 enumerated categories) without requiring physical presence. Gross or net election.
Article 12C	[No corresponding Article]	Insurance premiums New 2025	Standalone article inserted in UN 2025 replacing former Article 5(6) Insurance PE. Source State may tax cross-border insurance premiums paid to foreign insurers.
Article 13	Capital gains	Capital gains	Both models allow source taxation of shares deriving >50% value from immovable property (Art. 13(4)). UN 2025 added paragraph 5 for natural resource rights alienation.
Article 14	[Deleted in 2000]	Independent personal services Deleted 2025	OECD deleted Art. 14 in 2000 (subsuming into Art. 7). UN Model deleted Art. 14 in 2025 (subsuming professional income into the new Article 12AA Fees for Services).
Article 15	Income from employment	Dependent personal services	Substantially identical 183-day rule and employer residence conditions for cross-border employment income.
Article 16	Directors’ fees	Directors’ fees and remuneration of top-level managerial officials	UN Model expands source taxing rights beyond formal board directors to include top-level managerial executives of resident companies.
Article 17	Entertainers and sportspersons	Artistes and sportspersons	Source State taxes performance income directly or where income accrues to another person (star-company structures).
Article 18	Pensions	Pensions and social security payments (Alternatives A & B)	OECD grants exclusive taxing right to Residence State. UN Alternative B grants Source State the right to tax pensions paid under public schemes/social security.
Article 19	Government service	Government service	Salaries and pensions paid by a Contracting State/subdivision for governmental functions taxed exclusively by the paying State.
Article 20	Students	Students	Payments received from abroad for education or training are tax-exempt in the host State. UN Model includes trainees and business apprentices.
Article 21	Other income	Other income	Major divergence: OECD gives exclusive right to Residence State. UN Model (Art. 21(3)) provides shared taxing rights to Source State!
CHAPTER IV: TAXATION OF CAPITAL
Article 22	Capital	Capital	Allocates taxing rights over elements of capital (real estate, PE business capital, ships/aircraft).
CHAPTER V: METHODS FOR ELIMINATION OF DOUBLE TAXATION
Article 23A	Exemption method	Exemption method	Full exemption or exemption with progression in the Residence State.
Article 23B	Credit method	Credit method	Ordinary credit (deduction of tax paid in source state up to domestic tax limit) or full credit.
CHAPTER VI: SPECIAL PROVISIONS
Article 24	Non-discrimination	Non-discrimination	Protects nationals and enterprises of a Contracting State from more burdensome taxation than domestic nationals under identical circumstances.
Article 25	Mutual agreement procedure (MAP)	Mutual agreement procedure (Alternatives A & B)	OECD has mandatory binding arbitration (2 years). UN Alternative B allows arbitration after 3 years only if requested by a competent authority. 2025 updates clarify non-recourse to GATS.
Article 26	Exchange of information	Exchange of information	Standard of "foreseeably relevant" information. Bank secrecy cannot justify non-cooperation. 2025 OECD Commentary update allows third-party tax use.
Article 27	Assistance in collection of taxes	Assistance in collection of taxes	Mutual assistance in collecting final revenue claims and adopting conservancy measures.
Article 28	Members of diplomatic missions and consular posts	Members of diplomatic missions and consular posts	Preserves fiscal privileges granted under customary international law or Vienna Conventions.
Article 29	Entitlement to benefits	Entitlement to benefits	Anti-abuse provisions codifying the Principal Purpose Test (PPT) and optional detailed LOB rules (post-BEPS Action 6).
Article 30	Territorial extension	[No corresponding Article]	OECD-only article permitting extension of the convention to overseas territories.
CHAPTER VII: FINAL PROVISIONS
Article 31 / 30	Entry into force (Art. 31)	Entry into force (Art. 30)	Ratification procedures and date of practical legal effect.
Article 32 / 31	Termination (Art. 32)	Termination (Art. 31)	Formal bilateral diplomatic notification procedures for denouncing the treaty.

Title and Preamble to the Model Conventions

Convergence on Anti-Treaty Shopping and BEPS Action 6 Minimum Standards

Preamble Architecture

Under public international law and Article 31 of the Vienna Convention on the Law of Treaties (VCLT), the Title and Preamble form an integral part of the context for interpreting treaty provisions. In recent years, both the OECD and UN Model Conventions have undergone convergence to firmly close the door on abusive treaty-shopping arrangements.

UN Model Convention Title & Preamble

Official Title:

“Convention between (State A) and (State B) for the elimination of double taxation with respect to taxes on income and capital and the prevention of tax avoidance and evasion”

Official Preamble:

“(State A) and (State B), Desiring to further develop their economic relationship and to enhance their cooperation in tax matters, Intending to conclude a Convention for the elimination of double taxation with respect to taxes on income and on capital without creating opportunities for non-taxation or reduced taxation through tax avoidance or evasion (including through treaty-shopping arrangements aimed at obtaining reliefs provided in this Convention for the indirect benefit of residents of third States)...”

OECD Model Comparison & Legal Effect

Identical Substance: The Title and Preamble of the OECD Model Convention is virtually identical to that of the UN Model. The only minor stylistic variance is the sequence of words: the OECD refers to “tax evasion and avoidance”, whereas the UN refers to “tax avoidance and evasion”.
Strict Teleological Effect: The Preamble explicitly declares that the treaty is not intended to generate double non-taxation or reduced taxation through treaty abuse.
Interpretive Significance: Under VCLT Article 31, domestic courts and tax authorities are legally mandated to interpret the substantive articles of the convention in light of this anti-abuse purpose, effectively disallowing colorable conduit routing and treaty-shopping schemes.

Article 1: Persons Covered & Fiscally Transparent Entities

Scope of Application, Hybrid Entities, Saving Clause & the New 2025 UN Subject-to-Tax Rule (STTR)

2025 STTR Update

Article 1 delineates the personal scope of the convention. Under Article 1(1), both the OECD and UN Model Conventions apply to persons who are residents of one or both of the Contracting States.

1. Fiscally Transparent Entities & Arrangements (Article 1(2))

Under Article 1(2), income derived by or through an entity or arrangement that is treated as wholly or partly fiscally transparent under the tax law of either Contracting State is considered to be income of a resident of a Contracting State, but only to the extent that the income is treated, for the purposes of taxation by that State, as the income of a resident of that State.

ICAI UN Commentary Example: Partnership with Mixed Resident/Non-Resident Partners

State A and State B have concluded a bilateral treaty identical to the Model Tax Convention. An entity established in State B receives interest income from a debtor resident in State A:

State A's Domestic Law: Treats the entity as an opaque company and seeks to tax it as the recipient.
State B's Domestic Law: Treats the entity as a fiscally transparent partnership. Under State B law, the entity itself pays no tax; instead, its two 50% members are each taxed directly on half of the interest income.
Status of Members: Member 1 is a resident of State B. Member 2 is a resident of a third country with which neither State A nor State B has a tax treaty.

Statutory Treaty Result under Article 1(2):
Because State B treats only half of the interest as income of a resident of State B (Member 1), only that half shall be considered, for the purposes of Article 11 (Interest), to be the income of a resident of State B entitled to the concessional withholding tax rates under the State A–State B treaty! The remaining 50% attributable to Member 2 (third-country resident) is ineligible for treaty benefits.

2. The Saving Clause (Article 1(4))

With the exception of specified articles (such as corresponding adjustments under Art. 9(2), relief from double taxation under Arts. 23A/23B, non-discrimination under Art. 24, MAP under Art. 25, and diplomatic privileges under Art. 28), the Convention does not affect the taxation by a Contracting State of its own residents.

3. UN 2025 Subject-to-Tax Rule (STTR - Article 1(3))

The 2025 UN Model inserted a landmark Subject-to-Tax Rule in Article 1(3). Under this rule, the Convention does not restrict a Contracting State from taxing income arising in its territory derived by a resident of the other State where that income is subject to a low level of taxation in that other State.

Low level of taxation exists if:
• Subject to a statutory rate at or below a bilaterally negotiated percentage; OR
• Benefiting from an exemption, exclusion, or special tax regime.

Application to Collective Investment Vehicles (CIVs)

Collective Investment Vehicles (CIVs) pool funds from numerous retail or institutional investors and adopt diverse legal forms (companies, trusts, partnerships, contractual funds). Where a widely held CIV is treated as a resident entity liable to tax under domestic law, it may claim treaty benefits on behalf of its investors, avoiding complex look-through compliance while preventing abusive routing.

Article 2: Taxes Covered

Substantive Scope: Taxes on Income and Capital & Future Substantially Similar Taxes

Art. 2

Article 2 defines the material scope of the treaty, specifying the exact sovereign levies to which the convention applies. The provisions in the OECD and UN Model Conventions are substantially identical:

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Article 2(1): Sovereign Scope

Applies to taxes on income and on capital imposed on behalf of a Contracting State or of its political subdivisions or local authorities, irrespective of the manner in which they are levied.

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Article 2(2): Broad Concept of Taxes on Income & Capital

Covers all taxes imposed on total income, on total capital, or on elements of income or of capital, including taxes on gains from the alienation of movable or immovable property, taxes on the total amounts of wages or salaries paid by enterprises, as well as taxes on capital appreciation.

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Article 2(3): Specified Existing Taxes

Explicitly enumerates the existing domestic tax enactments of each Contracting State (e.g., in the Indian context: “the income-tax, including any surcharge thereon”).

4

Article 2(4): Substantially Similar Future Taxes

Extends automatically to any identical or substantially similar taxes that are imposed after the date of signature of the Convention in addition to, or in place of, the existing taxes. Competent authorities must notify each other of significant tax law changes.

Article 4: Resident & Dual Residence Tie-Breakers

Liability to Tax, Inclusion of Place of Incorporation & The 5-Tier Individual Tie-Breaker Waterfall

Core Exam Concept

Because treaty entitlement under Article 1 is restricted to "residents", Article 4 determines whether a person is a resident of a Contracting State and resolves cases where domestic tax laws cause an assessee to be a dual resident.

Significance of the Concept of Resident

Determines the convention’s personal scope of application;
Solves dual-residence conflicts where both states claim taxing rights on worldwide income; and
Solves source-residence conflicts where income arises in one state to a resident of the other.

Meaning of Resident & UN vs. OECD Textual Distinction (Article 4(1))

Under Article 4(1), "resident of a Contracting State" means any person who, under the laws of that State, is liable to tax therein by reason of his domicile, residence, place of management, place of incorporation (UN Model only), or any other criterion of a similar nature.

Key Divergence: The UN Model explicitly includes “place of incorporation” in Article 4(1), whereas the OECD Model omits it, relying instead on "place of management" or domestic connection criteria. Neither model treats a person as a resident if they are liable to tax only on income from sources within that State.

Dual Residence Tie-Breaker for Individuals (Article 4(2) 5-Tier Waterfall)

Where an individual is found to be a tax resident of both Contracting States under their respective domestic tax laws, dual residence is conclusively broken using the sequential 5-tier waterfall test under Article 4(2):

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Test 1: Permanent Home Available

The individual is deemed to be a resident only of the State in which he has a permanent home available to him. A permanent home requires a dwelling (house, apartment, rented flat) arranged and retained for continuous, permanent use, rather than for a temporary stay.

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Test 2: Centre of Vital Interests (Personal & Economic Relations)

If the individual has a permanent home available in both States, or in neither State, he is deemed to be a resident only of the State with which his personal and economic relations are closer (family, social ties, occupations, political, cultural, or other activities, and place of business).

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Test 3: Habitual Abode

If the State of vital interests cannot be determined, or if he has no permanent home in either State, preference is given to the Contracting State in which he has an habitual abode (determined by frequency, duration, and regularity of physical stays over a reasonable period).

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Test 4: Nationality / Citizenship

If the individual has an habitual abode in both States or in neither of them, he is deemed to be a resident only of the State of which he is a national.

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Test 5: Mutual Agreement Procedure (MAP)

If the individual is a national of both States or of neither of them, the competent authorities of the Contracting States shall settle the question by mutual agreement under Article 25.

Dual Residence for Non-Individuals (Article 4(3) - Post-BEPS MAP Approach)

Historically, both models resolved corporate dual residence using the "Place of Effective Management" (POEM) tie-breaker. Following BEPS Action 6, both the OECD and UN Model Conventions revised Article 4(3) to eliminate the automatic POEM rule:

Where a non-individual is resident in both States, the competent authorities shall endeavor to determine residence by mutual agreement, having regard to its place of effective management, place of incorporation, and any other relevant factors.
Severe Treaty Sanction: In the absence of such mutual agreement, the entity shall not be entitled to any relief or exemption from tax provided by the Convention, except to the extent agreed upon by the competent authorities!

Article 5: Permanent Establishment (PE)

Basic Rule PE (6 Criteria), Building Site PE, Service PE, Agency PE & 2025 Updates

Art. 5 Threshold

The concept of Permanent Establishment (PE) is the foundational nexus rule in international taxation. It serves as the legal threshold granting the Source State the sovereign right to tax business profits under Article 7. Its broadly comparable domestic-law concept in India is a “business connection” under Section 9 of the Income-tax Act, 2025.

1. Basic Rule PE (Article 5(1) - 6 Cumulative Conditions)

Under Article 5(1), a Permanent Establishment means a “fixed place of business through which the business of an enterprise is wholly or partly carried on.” A Basic Rule PE exists only if all 6 conditions are satisfied cumulatively:

There must be an enterprise;
The enterprise must be carrying on a business;
There must be a place of business (premises, facilities, installations, tangible assets);
The place of business must be at the disposal of the enterprise (right to use / effective control);
The place of business must be fixed (established at a distinct geographical point with a certain degree of permanence); and
The business of the enterprise is carried on wholly or partially through this fixed place.

If any single condition is missing (e.g., place is purely transient or not at disposal), a basic rule PE does not exist!

Article 5(2): Specific Examples Especially Included

The term "permanent establishment" includes especially: (a) a place of management; (b) a branch; (c) an office; (d) a factory; (e) a workshop; and (f) a mine, an oil or gas well, a quarry, or any other place of extraction of natural resources.

PE Type	OECD Model Convention (2025)	UN Model Convention (2025)
Construction / Building Site PE (Art. 5(3))	A building site or construction or installation project constitutes a PE only if it lasts more than 12 months.	A building site, construction, assembly or installation project, or connected supervisory activities constitute a PE if lasting more than 6 months.
Service PE (Art. 5(3)(b))	No Service PE Clause OECD Model has no explicit Service PE provision. Service taxation requires a fixed place under Art. 5(1).	Explicit Service PE Furnishing of services through employees or personnel for the same/connected project aggregating more than 183 days in any 12-month period constitutes a PE. (Words “including consultancy services” deleted in 2025 due to new Art. 12AA).
Agency PE (Art. 5(5) & 5(6))	Dependent agent habitually concludes contracts or habitually plays the principal role leading to contract conclusion in the name of the enterprise.	Includes the OECD contract-conclusion rule, PLUS a dependent agent who habitually maintains a stock of goods or merchandise from which he regularly delivers goods on behalf of the enterprise!
Insurance PE	No Insurance PE provision. Standard Agency PE rules apply.	Deleted in UN 2025: Former Article 5(6) Insurance PE was removed and replaced by standalone Article 12C (Insurance Premiums)!
2025 OECD Commentary Update	Home Office & Teleworking: Guidance clarifying when cross-border telework / home office of an employee creates a PE (requires factual disposal and employer insistence).	Similar teleworking considerations evaluated in light of physical presence and service duration.

Article 7: Business Profits & The Force of Attraction Rule

Taxing Rights Allocation, Attribution of Profits & UN Force of Attraction (FOA)

Art. 7

Article 7 governs the taxation of business profits earned by an enterprise of a Contracting State. The universal baseline principle is that business profits of an enterprise can only be taxed by the Residence State, unless the enterprise carries on business in the Source State through a Permanent Establishment situated therein.

1. OECD Approach: Direct Attribution Only

Under the OECD Model Convention, if an enterprise carries on business through a PE in the Source State, the Source State is permitted to tax only such profits as are directly attributable to that specific PE.

Profits derived from direct sales or transactions executed by the foreign head office independently into the Source State cannot be taxed by the Source State, even if they involve identical products.

2. UN Approach: Force of Attraction (FOA) Rule

Under Article 7(1) of the UN Model Convention, once a foreign enterprise sets up a PE in the Source State, it brings the enterprise within the fiscal jurisdiction of that State. The Source State can tax:

(a) Profits directly attributable to that PE;
(b) Profits from sales in the Source State of goods or merchandise of the same or similar kind as those sold through that PE; and
(c) Profits from other business activities carried on in the Source State of the same or similar kind as those effected through that PE.

Commercial & Tax Impact of the Force of Attraction Rule

The Force of Attraction rule prevents multinational enterprises from bypassing their local branch/PE. If an enterprise establishes a PE in the Source State to distribute specialized industrial machinery, and the foreign head office simultaneously sells the exact same line of machinery directly to local buyers via direct shipments from abroad, the UN Model "attracts" the profits from those direct head-office sales into the Source State's tax net!

Articles 11 & 12: Interest & Royalties (2025 Software Scope)

Taxing Rights Allocation, Scope of Debt-Claims & The 2025 UN Software Royalties Revolution

2025 Software Amendment

1. Article 11: Interest — Scope & Allocation

Article 11 governs cross-border interest flows. Paragraph 1 grants the Residence State the right to tax interest. Paragraph 2 establishes a shared taxing right, allowing the Source State to also tax interest, but capping the withholding tax rate at a bilaterally agreed ceiling if the recipient is the beneficial owner.

Feature	Statutory Rule under OECD & UN Models
Definition of Interest	Income from debt-claims of every kind, whether or not secured by mortgage and whether or not carrying a right to participate in the debtor's profits, and in particular, income from government securities, bonds, or debentures, including premiums and prizes attaching to such securities.
Statutory Exclusion	Penalty charges for late payment are expressly excluded from the definition of interest in both models.
PE Override (Art. 11(4))	If the beneficial owner carries on business through a PE in the Source State and the debt-claim is effectively connected with that PE, Article 7 (Business Profits) applies instead of Article 11.

2. Article 12: Royalties — Fundamental Divergence & UN 2025 Software Update

Article 12 exhibits one of the sharpest ideological divides between the OECD and UN Model Conventions:

OECD Model: Exclusive Residence Taxation

Under the OECD Model, royalties arising in the Source State and beneficially owned by a resident of the other State are taxable ONLY in the Residence State. The Source State is stripped of all taxing rights at source!

Exclusions: OECD excludes equipment leasing (ICS equipment), excludes radio/TV broadcasting tapes/films, and refuses to treat payments for software distribution or standard software copies as royalties.

UN Model: Shared Source & Residence Taxation

Under the UN Model, royalties are subject to shared taxing rights — taxable in the Residence State and also taxable in the Source State at a negotiated withholding rate ceiling.

Broad Scope: Includes copyright of literary/artistic/scientific works (including films/tapes for radio/TV), patents, trademarks, designs, plans, secret formulas, industrial, commercial or scientific (ICS) equipment, and ICS know-how.

The Landmark 2025 UN Model Expansion: Software Payments (Sub-paragraph (c))

In the September 2025 UN Model Update, the definition of “royalties” under Article 12 was decisively expanded by inserting sub-paragraph (c):

“payments of any kind received as a consideration for the use of, or the right to use, any software, or paid as a consideration for the acquisition of any software...”

Critical Legal Rule: Under the 2025 UN Model, a transfer of copyright in the software is NOT required for such payments to fall within the definition of royalties! Payments for off-the-shelf software, software licenses, SaaS subscriptions, and digital acquisition now qualify squarely as royalties under the UN Model, aligning with developing country litigation positions.

Article 12AA: Fees for Services (The 2025 UN Overhaul)

Deletion of Article 12A (FTS) & Article 14 (Independent Services) • Universal Service Scope

2025 Overhaul

The 2025 UN Model Convention introduced a monumental structural transformation in cross-border services taxation:

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Historical Evolution: From Art. 12A FTS to Art. 12AA

In 2017, the UN Model inserted Article 12A on Fees for Technical Services (FTS), allowing source taxation on managerial, technical, or consultancy services. India has had domestic FTS provisions since 1976 under Section 9(1)(vii).

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The 2025 Deletion of Article 12A and Article 14

In the 2025 UN Model, Article 12A (Fees for Technical Services) and Article 14 (Independent Personal Services) were both formally DELETED! They were completely superseded by the new, comprehensive Article 12AA (Fees for services).

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Universal Scope: "Any Payment in Consideration for Any Service"

Under Article 12AA(3), “fees for services” means any payment in consideration for any service. The qualifying adjectives “managerial, technical, or consultancy” have been discarded! Any service fee arising in a Contracting State paid to a resident of the other State may be taxed in the Source State at a negotiated ceiling.

Provision	Mechanics & Rules under Article 12AA
Specific Exclusions	To prevent overlap, Article 12AA does not apply to payments governed by specific articles: • International transport (Art. 8); • Automated digital services (Art. 12B); • Insurance premiums (Art. 12C); • Employment (Art. 15); • Directors’ fees & top managers (Art. 16); • Artistes & sportspersons (Art. 17); • Pensions (Art. 18); • Government service (Art. 19).
PE Override (Art. 12AA(4))	Where the beneficial owner carries on business through a PE in the Source State and the fees are effectively connected with that PE, Article 7 (Business Profits) applies.
Sourcing Rule (Art. 12AA(6))	Fees for services are deemed to arise in a Contracting State if paid by a resident of that State, or if paid by a non-resident who has a PE in that State and the fees are borne by that PE.

Article 12B: Income from Automated Digital Services (ADS)

UN Model Taxation of the Digital Economy Without Physical Nexus • The 9 Enumerated Categories

UN Art. 12B

With the exponential expansion of telecommunications and digital commerce, multinational tech conglomerates generate massive revenues from user markets without maintaining any physical footprint or Permanent Establishment. Article 12B was added to the UN Model Convention (introduced in 2021, refined in 2025) to preserve the sovereign domestic taxing rights of source countries. There is no corresponding article in the OECD Model Convention!

1. Definition & Core Mechanics of ADS (Art. 12B(5))

“‘Automated digital services’ means any service provided on the Internet or an electronic network requiring minimal human involvement from the service provider.”

Key Benchmark — Scalability: The defining test of an automated digital service is its capacity to scale up and provide identical automated services to millions of global users with negligible additional human intervention.

2. Dual Taxing Mechanism: Gross vs. Net Election

Gross Withholding Tax (Art. 12B(2)): Source State may tax gross ADS payments at a bilaterally negotiated withholding rate (e.g., 3%, 4%, or 5%).
Net Basis Election (Art. 12B(3)): The non-resident taxpayer has the unilateral legal right to elect to be taxed on a net profit basis, computed by applying the qualified profitability ratio of the enterprise's digital business segment to its Source-State revenues.

Article 12B(6): The 9 Specific Inclusions of Automated Digital Services

Under Article 12B(6), Automated Digital Services specially include the following 9 categories:

(a) Online advertising services

(b) Supply of user data

(c) Online search engines

(d) Online intermediation platforms

(e) Social media platforms

(f) Digital content services

(g) Online gaming

(h) Cloud computing services

(i) Standardized online teaching

Non-Exclusivity: These categories are not mutually exclusive (e.g., digital content platforms funded by advertising). If payments qualify as royalties under Art. 12 or insurance under Art. 12C, those specific articles prevail.

Article 12C: Insurance Premiums (New 2025 UN Model)

Transition from Former Article 5(6) Insurance PE to Standalone Withholding Regime

New 2025 Article

Under Article 12C of the 2025 UN Model, insurance premiums arising in a Contracting State and paid to an insurer resident in the other Contracting State may be taxed in the Source State at a negotiated withholding rate ceiling.

Structural Shift from Former Article 5(6)

Article 12C represents a fundamental modernizing shift. Formerly, insurance was governed by Article 5(6), which deemed an Insurance PE to exist if a foreign enterprise collected premiums or insured risks in the Source State through an agent. Article 12C discards the cumbersome PE fiction and establishes a direct gross withholding mechanism on cross-border premiums.

Definitions & PE Override

Insurance Premiums: Amounts paid to an insurer pursuant to a contract in which the insurer undertakes, in return for a premium, to indemnify the insured against loss, damage, or liability.
Insurer: A person or arrangement the majority of whose income consists of insurance premiums and investment returns.
PE Override: Where the insurer carries on business through a local PE and the insurance policy is effectively connected with that PE, Article 7 applies.

Article 13: Capital Gains

Real Property Situs, Indirect Immovable Property Transfers (>50% Rule) & Natural Resource Rights

Art. 13

Article 13 allocates taxing rights over capital gains arising from the alienation of property. Computation and cost indexation mechanics are left to domestic tax legislation.

Category of Asset Alienated	Taxing Right Allocation	Statutory Rules & UN 2025 Additions
Immovable Property (Art. 13(1))	Taxable in the Situs State (where real estate is located).	Both models grant full taxing rights to the State in which the real property is situated.
Movable Property of a PE (Art. 13(2))	Taxable in the Source State where the PE is situated.	Includes gains from the alienation of the PE itself (alone or with the whole enterprise).
Ships & Aircraft in International Traffic (Art. 13(3))	Taxable only in the Residence State of the enterprise.	Exclusive taxing right to the enterprise's state of effective management/residence.
Shares Deriving Value from Immovable Property (Art. 13(4))	Taxable in the State where the Immovable Property is situated.	Applies to gains from shares or comparable interests (e.g. partnership, trust) deriving more than 50% of their value directly or indirectly from immovable property situated in that State.
Natural Resource Exploration Rights (Art. 13(5) - UN 2025)	Taxable in the Situs State of Natural Resources.	New UN 2025 Allows a State to tax gains from alienation of rights granted under its law to explore for or exploit natural resources located in that State.
Residual Alienation Gains (Art. 13(6) / 13(5) OECD)	Taxable only in the Residence State of the alienator.	Exclusive right to Residence State for general portfolio shares, bonds, or intellectual property.

Article 21 & Chapter V: Other Income & Double Tax Elimination

Residual Income Allocation • Exemption Method (Art. 23A) vs. Credit Method (Art. 23B)

Arts. 21, 23A & 23B

1. Article 21: Other Income — Fundamental OECD vs. UN Divergence

Article 21 serves as the sweep-up article, governing items of income not specifically dealt with in the preceding distributive articles of the Convention (e.g., lottery winnings, gambling proceeds, awards, punitive damages, and financial derivatives).

OECD Approach: Exclusive Residence Taxation

Under Article 21(1) of the OECD Model, items of income of a resident of a Contracting State, wherever arising, not dealt with in the foregoing Articles shall be taxable ONLY in the Residence State. The Source State has zero right to tax.

UN Approach: Shared Source & Residence Taxation (Art. 21(3))

Under Article 21(3) of the UN Model, items of income of a resident of a Contracting State not dealt with in the foregoing Articles and arising in the other Contracting State may ALSO be taxed in that other State (Source State)!

PE Override (Art. 21(2)): In both models, if the recipient carries on business through a PE in the Source State and the right/property in respect of which income is paid is effectively connected with that PE, Article 7 applies.

2. Chapter V: Methods for the Elimination of Double Taxation (Articles 23A & 23B)

The provisions of Chapter V address juridical double taxation — where the same taxpayer is subjected to tax in two sovereign jurisdictions in respect of the same economic income or capital. They do not automatically eliminate economic double taxation (where two distinct taxpayers are taxed on the same income).

Method	Sub-Types	Mechanics & Statutory Operation
Article 23A: Exemption Method	• Full Exemption • Exemption with Progression	The Residence State does not tax foreign-source income. Under exemption with progression, while the foreign income is exempt, the Residence State takes that income into account for determining the graduated progressive tax rate to be applied to the taxpayer’s remaining domestic income.
Article 23B: Credit Method	• Ordinary Credit • Full Credit	The Residence State taxes worldwide income but grants a foreign tax credit (FTC) for taxes paid in the Source State. Under the ordinary credit (standard practice in India under Section 160 / old Sec. 91), the credit is capped at the domestic income tax attributable to that foreign income.

Article 25: Mutual Agreement Procedure (MAP) & GATS

Dispute Resolution, Mandatory Arbitration Rules & The 2025 Non-Recourse to GATS Safeguard

Art. 25 MAP

Article 25 provides a bilateral dispute-resolution mechanism where a taxpayer considers that actions of one or both Contracting States result or will result in taxation not in accordance with the Convention.

Feature	OECD Model Convention (Article 25)	UN Model Convention (Article 25B)
Alternatives Provided	Single standard provision containing mandatory arbitration under Art. 25(5).	Provides two options: Alternative A (no arbitration) and Alternative B (arbitration).
Arbitration Timeline Threshold	Arbitration may be initiated if competent authorities fail to reach agreement within 2 years.	Arbitration may be initiated only if competent authorities fail to resolve the case within 3 years.
Who Can Request Arbitration?	Arbitration is triggered on request of the taxpayer.	Arbitration must be requested in writing by the competent authority of a Contracting State (taxpayer cannot directly compel it).
Authority to Depart from Award	Arbitration decision is final and binding on both States.	Competent authorities are empowered to depart from the arbitration decision if they agree on a different bilateral solution within 6 months!

The 2025 OECD & UN Updates on GATS Article XXII(3) & Investment Treaties

Both the 2025 OECD Update (new Art. 25(6)) and the 2025 UN Model incorporated groundbreaking provisions governing the interaction between tax treaties and other international agreements:

Exclusive Tax Forum: A dispute as to whether a taxation measure falls within the scope of the tax Convention can be brought before the WTO Council for Trade in Services under GATS Article XXII(3) ONLY with the consent of both Contracting States!
MAP Primacy: In the absence of mutual consent, any such dispute must be settled exclusively under the Mutual Agreement Procedure of the tax convention.
Protection Against Investment Treaty Claims: A taxation measure taken by a Contracting State in accordance with the DTAA shall not be regarded as breaching any other international treaty or investment pact. Recourse to external investor-state dispute settlement (ISDS) tribunals is barred.

Article 26: Exchange of Information

Administrative Assistance, Bank Secrecy Override & 2025 OECD Commentary on Third-Party Use

Art. 26

Article 26 is the primary international legal mechanism for cross-border tax transparency. It facilitates the effective exchange of information to enforce domestic tax laws, prevent cross-border tax evasion and aggressive tax avoidance, and curtail illicit capital flight.

1. Mandatory Obligations & Bank Secrecy

Foreseeable Relevance: Information must be exchanged if it is "foreseeably relevant" for carrying out the convention or administering domestic tax laws.
No Bank Secrecy Defense: A Contracting State cannot decline to supply information solely because it is held by a bank, other financial institution, nominee, or person acting in an agency or fiduciary capacity.
No Domestic Interest Defense: A State cannot refuse to collect information solely because it has no domestic tax interest in that specific taxpayer or transaction.

2. Legitimate Grounds of Refusal & 2025 Update

Attorney-Client Privilege: A State is not required to disclose confidential communications between an attorney and client protected under domestic law.
Trade Secrets & Public Policy: A State may decline to supply information that would disclose any trade, business, industrial, or professional secret, or information contrary to public policy (ordre public).
2025 OECD Commentary Clarification: Information exchanged under Article 26 may, subject to applicable domestic conditions, be utilized for tax matters concerning persons other than the person in respect of whom the information was initially exchanged!

Test Your Knowledge (TYK) Questions & Solutions

Exhaustive Solutions to All 5 ICAI Module Questions with Toggle Cards

5 ICAI TYKs Solved

TYK Question 1: Significant Differences Between UN and OECD Model Tax Conventions

Question: Explain briefly the significant differences between the UN and OECD Model Tax Conventions.

Comprehensive Comparative Analysis: UN vs. OECD Model Tax Conventions:

While the OECD and UN Model Conventions share substantial textual convergence post-BEPS, they embody fundamentally distinct economic philosophies regarding the allocation of taxing rights between Residence and Source States:

Area / Article	OECD Model Convention (2025)	UN Model Convention (2025)
Primary Economic Orientation	Favors Residence-State taxation, reflecting the interests of capital-exporting developed economies. Seeks to minimize source withholding taxes.	Favors Source-State taxation, safeguarding the tax base of capital-importing developing nations while preserving investment incentives.
Subject-to-Tax Rule (Art. 1(3))	No STTR in Article 1.	Inserted in 2025: Article 1(3) STTR preserves source taxation where income is subject to a low level of taxation in the residence State.
Definition of Resident (Art. 4(1))	Does not include "place of incorporation".	Explicitly includes "place of incorporation" as a criterion of residence.
Building Site PE (Art. 5(3))	Threshold of more than 12 months.	Threshold of more than 6 months.
Service PE (Art. 5(3)(b))	No explicit Service PE provision in Article 5.	Explicit Service PE clause where service duration exceeds 183 days in any 12-month period.
Agency PE & Stock of Goods (Art. 5(5))	Restricted to dependent agents concluding contracts or playing the principal role.	Includes agents who maintain a stock of goods from which they regularly make deliveries.
Business Profits Attribution (Art. 7)	Direct attribution only: Taxes only profits directly attributable to the PE.	Force of Attraction (FOA) Rule: Taxes PE profits PLUS direct sales of similar goods or similar business activities in that State.
Royalties (Art. 12)	Taxable exclusively in Residence State (0% source tax). Excludes ICS equipment and software acquisition.	Shared taxing rights: Source State may levy withholding tax. In 2025, sub-paragraph (c) added software payments without requiring copyright transfer!
Fees for Services (Art. 12AA)	No article on fees for services (deleted Art. 14 in 2000).	New 2025 Article 12AA: Replaces deleted Arts. 12A & 14, granting source taxation over all cross-border service fees.
Automated Digital Services (Art. 12B)	No corresponding article.	Article 12B: Grants Source State gross or net taxing rights over 9 categories of Automated Digital Services without physical nexus.
Insurance Premiums (Art. 12C)	No corresponding article.	New 2025 Article 12C: Standalone gross withholding tax on cross-border insurance premiums paid to foreign insurers.
Other Income (Art. 21)	Taxable exclusively in Residence State.	Shared taxing rights: Article 21(3) allows Source State to also tax items of other income arising in its territory.
MAP Arbitration (Art. 25)	Mandatory binding arbitration triggered by taxpayer after 2 years.	Alternative B allows arbitration only after 3 years, requested only by a competent authority, with 6-month departure power.

TYK Question 2: Dual Residence Tie-Breaker Rule Application

Question: When does it become necessary to apply the tie-breaker rule? Discuss the manner of application of the tie-breaker rule.

1. Necessity of the Tie-Breaker Rule:

Every sovereign jurisdiction prescribes its own criteria in domestic tax law to determine residential status (e.g., physical stay of 182 days in India, domicile/citizenship in other countries). Because domestic rules operate autonomously, an individual may satisfy the residence criteria of both Contracting States simultaneously, becoming a "dual resident".

Since Article 1 restricts treaty benefits to residents and distributive articles allocate taxing rights based on which State is the "Residence State", dual residence creates total paralysis and double worldwide taxation. It therefore becomes indispensable to apply the tie-breaker rule under Article 4(2) to assign the individual a single fiscal residence for treaty purposes.

2. Sequential Manner of Application of Article 4(2) Waterfall:

First Test — Permanent Home Available:
The individual is deemed a resident only of the State in which he has a permanent home available to him. A permanent home is a dwelling (house, flat, apartment) arranged and retained for continuous, permanent use, rather than for a stay of temporary duration.
Second Test — Centre of Vital Interests:
If the individual has a permanent home available in both States, or in neither State, preference is given to the State with which his personal and economic relations are closer (centre of vital interests). Regard is had to family and social ties, occupations, political, cultural, and business activities.
Third Test — Habitual Abode:
If the State of vital interests cannot be determined, or if he has no permanent home in either State, he is deemed a resident only of the State in which he has an habitual abode (evaluated by the frequency, duration, and regularity of stays of the individual in each State over a reasonable period).
Fourth Test — Nationality / Citizenship:
If he has an habitual abode in both States or in neither of them, he shall be deemed to be a resident only of the State of which he is a national.
Fifth Test — Mutual Agreement Procedure (MAP):
If he is a national of both States or of neither of them, the competent authorities of the Contracting States shall settle the question by mutual agreement under Article 25.

TYK Question 3: Meaning of "Interest" and "Royalty" under the UN Model Convention

Question: Explain the meaning of “interest” and “royalty” under the UN Model Convention.

1. Meaning of "Interest" under Article 11 of the UN Model Convention:

As per Article 11(3) of the UN Model Convention, the term “interest” essentially means income from debt-claims of every kind, whether or not secured by mortgage and whether or not carrying a right to participate in the debtor's profits. In particular, it covers:

Income from government securities;
Income from bonds or debentures, including premiums and prizes attaching to such securities, bonds, or debentures;
Statutory Exclusion: Penalty charges for late payment are NOT regarded as interest for the purposes of this Article.

2. Meaning of "Royalties" under Article 12 of the UN Model Convention (Incorporating 2025 Update):

As per Article 12(3) of the UN Model Convention, the term “royalties” means payments of any kind received as a consideration for:

Use of, or right to use, Intellectual Property:
Any copyright of literary, artistic, or scientific work (including cinematograph films, or films or tapes used for radio or television broadcasting);
Industrial & Commercial IP:
Any patent, trademark, design or model, plan, secret formula or process;
Equipment Rentals:
The use of, or the right to use, industrial, commercial, or scientific (ICS) equipment;
Commercial Know-How:
Information concerning industrial, commercial, or scientific experience; or
Software Payments (2025 Sub-paragraph (c) Addition):
The use of, or the right to use, any software, or paid as a consideration for the acquisition of any software. A transfer of copyright in the software is not required for such payments to constitute royalties!

TYK Question 4: Meaning of Automated Digital Services (ADS)

Question: What is the meaning of Automated Digital Services? Elucidate.

1. Statutory Definition under Article 12B of the UN Model Convention:

As per Article 12B(5) of the UN Model Convention, “Automated digital services” (ADS) means:

“any service provided on the Internet or an electronic network requiring minimal human involvement from the service provider.”

The Benchmark of Scalability: The quintessential characteristic of an automated digital service is whether the enterprise can scale up and deliver the service to an expanding customer base with minimal additional marginal human labor.

2. The 9 Enumerated Categories under Article 12B(6):

Under Article 12B(6), Automated Digital Services specially include:

Online advertising services: Programmatic display ads, sponsored links, pay-per-click ads.
Supply of user data: Monetization and transfer of behavioral, demographic, or search data collected from platform users.
Online search engines: Search retrieval services monetized via user traffic.
Online intermediation platform services: Digital marketplaces connecting third-party buyers and sellers (e.g., e-commerce, ride-sharing, food delivery).
Social media platforms: Digital networks facilitating user networking, messaging, and content sharing.
Digital content services: Streaming or downloading of digital music, videos, films, podcasts, or electronic publications.
Online gaming: Interactive multi-player gaming services provided over the Internet.
Cloud computing services: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS).
Standardized online teaching services: Automated or pre-recorded online instructional courses where human grading or live tutoring is negligible.

TYK Question 5: Taxation of Royalties under Article 12 (OECD vs. UN Model)

Question: Explain the provisions relating to taxation of royalties under Article 12 of the OECD Model Convention and the UN Model Convention.

Comprehensive Analysis of Article 12 (Royalties):

Article 12 allocates taxing rights over royalty income between the Residence and Source States. The two model conventions diverge fundamentally on both taxing rights and definition:

Feature	OECD Model Convention (Article 12)	UN Model Convention (Article 12)
Allocation of Taxing Rights	Royalties arising in a Contracting State and beneficially owned by a resident of the other State are taxable ONLY in the Residence State. The Source State has no right to tax.	Shared taxing rights: Taxable in the Residence State and also taxable in the Source State at a negotiated withholding rate ceiling.
Industrial, Commercial or Scientific (ICS) Equipment	Excluded: Rental of industrial, commercial, or scientific equipment is excluded from Article 12 (governed by Article 7 as business profits).	Included: Payments for the use of, or right to use, ICS equipment are expressly included in the definition of royalties.
Radio & Television Broadcasting Media	Excluded: Films or tapes used for radio or television broadcasting are not treated as royalties.	Included: Explicitly includes cinematograph films or films/tapes used for radio or television broadcasting.
Software Payments (2025 Update)	Narrow approach: Payments for standard software licenses or software distribution are treated as business profits (Art. 7) rather than royalties, unless copyright itself is transferred.	Expanded in 2025: Sub-paragraph (c) expressly includes payments for the use of, or right to use, any software, or consideration for acquisition of software. Transfer of copyright is not required!
PE Override Rule	If the beneficial owner carries on business through a PE in the Source State and the right/property is effectively connected with that PE, Article 7 applies.	Identical PE override rule: Article 7 applies if effectively connected with a PE in the Source State.