Advanced Direct Tax Laws and Practice · Double Taxation Avoidance Agreement (DTAA)

OECD and UN Model Conventions and Treaty Interpretation

Updated 11 October 2026 · Fact-checked

The OECD and UN Model Conventions are templates that countries use to negotiate bilateral tax treaties. The OECD Model favours residence-country taxation. The UN Model gives more taxing rights to the source country. India's treaties follow neither exactly; courts read each treaty by its own text, using the Models and Vienna Convention principles as aids.

Understand Model Conventions: OECD and UN and Treaty Interpretation

A Double Taxation Avoidance Agreement (DTAA) is a bilateral treaty. Two countries negotiate it to decide who may tax which income. Negotiating from a blank page every time is slow, so countries start from a Model Convention. A Model is a standard draft with ready-made articles. It is not a law and does not bind anyone. It becomes binding only when two countries sign a treaty based on it and, in India, the Central Government notifies it.

There are two main Models. The OECD Model was prepared by the Organisation for Economic Co-operation and Development. It suits countries that invest and send capital abroad about as much as they receive it. It leans towards the residence country: the country where the taxpayer lives gets the main right to tax. The UN Model was prepared for treaties between developed and developing countries. It leans towards the source country: the country where the income arises keeps more taxing rights. India is a capital-importing country in many treaties, so most Indian treaties borrow heavily from the UN Model, with many negotiated variations.

Both Models have a similar structure. They begin with scope: persons covered and taxes covered. Then come definitions, including residence and the tie-breaker rule, and the permanent establishment (PE) article. Next are the distributive articles, one for each class of income: business profits, shipping and air transport, associated enterprises, dividends, interest, royalties and fees, capital gains, independent and dependent personal services, directors' fees, artistes and sportspersons, pensions, government service, students and others. Then come the methods for eliminating double taxation, and the administrative articles: non-discrimination, mutual agreement procedure, exchange of information, and entry into force and termination.

The main differences you should remember are in a few places. The UN Model has a wider PE definition, for example a shorter threshold for building sites and installation projects and a service PE. It allows source taxation of royalties and fees for technical services at a limited rate, where the OECD Model gives that right only to the residence country. It keeps a fixed-base concept for independent personal services. The UN Model also allows source taxation of more capital gains. Always check the actual treaty, because India's treaties differ from both Models.

Treaty interpretation is the second half of this topic. The Vienna Convention on the Law of Treaties sets the general rules. A treaty is read in good faith, in the ordinary meaning of its terms, in their context and in the light of its object and purpose. Context includes the text, preamble and related agreements. If the meaning stays unclear, supplementary material such as preparatory work can be used. In India, courts treat the OECD and UN Commentaries as persuasive aids, particularly where the treaty follows the Model's wording. They are not binding. The treaty's own text always prevails. Where the treaty is silent on a term, the domestic law meaning is usually used, subject to the treaty's context. The Income-tax Act, 2025 gives the power to enter into such agreements under section 159, covered in a separate topic.

Key rules to remember

Nature of a Model Convention: Model = template for negotiation, not binding law; It binds only after two countries sign a treaty and India notifies it.
OECD vs UN allocation: OECD Model → residence-country bias; UN Model → source-country bias; Say 'bias' or 'tendency', not that the Models are always opposite on every article.
Structure of a typical treaty: Scope → Definitions → Distributive articles → Elimination of double taxation → Special and administrative articles → Final provisions; Use this order as a skeleton when you describe any treaty in an answer.
General rule of interpretation (Vienna Convention): Ordinary meaning + context + object and purpose, read in good faith; Preparatory work is only a supplementary means when the text is ambiguous or leads to an absurd result.
Status of Commentaries: OECD/UN Commentaries = persuasive aids, not binding; Most useful where the treaty wording matches the Model; treaty text prevails on conflict.
Associated enterprise threshold (domestic law, section 162): Voting power ≥ 26%; loan ≥ 51% of book value of total assets; guarantee ≥ 10% of total borrowings; Domestic definition used for transfer pricing. A treaty's associated enterprises article has its own wording, so do not mix them.

How to solve Model Conventions: OECD and UN and Treaty Interpretation questions

Use this method for any question on Model Conventions or treaty interpretation. It keeps your answer in the provision, analysis, conclusion order that the written paper rewards.

1Identify what is asked: a comparison of Models, the structure of a treaty, or how to interpret a clause in a given fact situation.
2Name the relevant Model and say what it is: a template, not binding law. State which country it favours.
3If it is a comparison, pick four or five clear points, such as the basis of taxation, the PE definition, royalties and fees, and capital gains. Do not list every article.
4If it is an interpretation problem, quote or paraphrase the treaty clause first. Then apply the Vienna rules: ordinary meaning, context, object and purpose.
5Use the Commentaries only as a persuasive aid. Say that the treaty text governs if it differs from the Model.
6Check whether the treaty is silent on a term. If so, refer to the domestic law meaning, read in the treaty's context.
7Link to the practical point: the treaty must be in force and notified, and the assessee should hold the documents needed to claim treaty benefit.
8Conclude in one clear sentence that answers the question asked.

Quickest way: Three-line answer frame

When to use it: When you have under ten minutes for a short note or a comparison question.

Line 1: define the Model in one sentence and state that it is a non-binding template.
Line 2: give the core contrast: OECD favours residence; UN favours source. Add two concrete differences, for example the PE threshold and source taxation of fees for technical services.
Line 3: add the interpretation rule: treaty text first, read under the Vienna Convention approach, with the Commentaries as persuasive aids only.

Common mistakes in Model Conventions: OECD and UN and Treaty Interpretation

Saying the OECD or UN Model is binding on India.
Students confuse a Model with a signed treaty.
Fix: Write that a Model is only a template. A treaty binds after signing and notification by the Central Government.
Saying India's treaties copy the UN Model exactly.
Notes say India follows the UN Model, and students stretch this.
Fix: Say India's treaties are influenced mostly by the UN Model but each has negotiated variations. Always read the actual article.
Treating Commentaries as law.
Commentaries are quoted often, so they feel authoritative.
Fix: Call them persuasive aids. If the treaty text differs from the Model, the text prevails.
Writing the Models differ on everything.
The residence versus source contrast is memorised as a slogan.
Fix: Both Models share the same basic structure and many articles. Give only specific points of difference.
Using the domestic associated enterprise test of 26% voting power to decide a treaty article.
Section 162 numbers are fresh from the transfer pricing chapter.
Fix: Section 162 defines the term for domestic transfer pricing. Apply the treaty's own wording when the question is about the treaty article.
Skipping the conclusion in a case question.
Students spend the time describing the Models.
Fix: After analysing the facts, state clearly which reading applies and what follows for the assessee.

Worked examples

Example 1

Explain how the OECD Model Convention differs from the UN Model Convention. Why do many of India's treaties follow the UN approach?

Show the solution

Definition: both are non-binding templates for bilateral tax treaties. They bind only after two countries adopt the text in a treaty.
Basis: the OECD Model favours taxation in the residence country. The UN Model preserves more taxing rights for the source country.
PE: the UN Model has a wider PE concept, for example a shorter time threshold for building sites and installation projects and a service PE.
Royalties and fees: the UN Model allows the source country to tax them at a limited rate. The OECD Model gives the right to the residence country.
Capital gains: the UN Model gives the source country more scope to tax them.
Reason for India: India is largely a capital-importing and source country in many of its treaties, so it prefers to retain taxing rights over income arising in India. Final treaty text is still negotiated treaty by treaty.

Answer: The OECD Model leans to residence taxation and the UN Model to source taxation, with differences in PE, royalties and fees, and capital gains. India's treaties lean towards the UN approach because India is mainly a source country, but each treaty is separately negotiated.

Example 2

An Indian treaty with Country X uses the term 'fees for included services' but does not define it fully. A dispute arises on whether a payment is covered. The assessee cites the OECD Commentary, which supports its view, but the treaty wording points the other way. How should the clause be interpreted?

Show the solution

Provision: a treaty is read in good faith, in the ordinary meaning of its terms, in their context and in the light of its object and purpose, as per the Vienna Convention principles.
Start with the treaty text. The wording of the clause and the rest of the article and protocol form the context.
Commentary: the OECD Commentary is a persuasive aid, mainly where the treaty follows the Model language. It is not binding.
Conflict: here the treaty wording differs from the position in the Commentary. The treaty text prevails, so the Commentary cannot override it.
Gap: if a term is still undefined, the domestic law meaning may be used, read in the treaty's context. Supplementary material such as preparatory work is used only if the meaning stays ambiguous.
Conclusion: decide using the treaty wording and its context, and treat the Commentary only as supporting material.

Answer: The clause is interpreted by its ordinary meaning in context and with regard to the treaty's object. The treaty wording prevails over the OECD Commentary, so the assessee's reliance on the Commentary does not succeed where the text points the other way.

Exam tips

Write the sentence 'A Model is a template, not binding law' early. It sets up everything else in your answer.
For comparison questions, give four or five specific differences with clear labels instead of general statements.
In interpretation problems, structure your answer as treaty clause, Vienna rule, role of Commentary, conclusion.
Do not quote an article number of a specific treaty unless you are certain. Describe the article by its subject instead.
Keep section 162 for transfer pricing answers. If a question mixes it with a treaty, state clearly which test applies.

Practice questions from Double Taxation Avoidance Agreement (DTAA)

Model Conventions: OECD and UN and Treaty Interpretation in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Model Conventions: OECD and UN and Treaty Interpretation: frequently asked questions

What is the main difference between the OECD and UN Model Conventions?

The OECD Model favours the residence country in allocating taxing rights. The UN Model gives more rights to the source country. This shows up in the PE definition, taxation of royalties and fees, and capital gains.

Is the Vienna Convention directly applicable to Indian DTAAs?

Its interpretation principles are widely used as guidance when reading treaties, including India's. They stress ordinary meaning, context, object and purpose. Always base your answer on the treaty text first.

Are the OECD Commentaries binding on Indian courts?

No. They are persuasive aids and are most useful where the treaty wording follows the Model. If the treaty text differs, the text prevails.

What is the typical structure of a DTAA?

It begins with scope and definitions, including residence and PE. Then come articles on each class of income, methods to eliminate double taxation, and administrative articles such as non-discrimination, mutual agreement procedure and exchange of information. It ends with entry into force and termination.