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CA Final · Direct Tax Laws & International Taxation

Overview of Model Tax Conventions for CA Final Direct Tax Laws & International Taxation

A model tax convention is a template that countries use to draft bilateral tax treaties. It allocates taxing rights and prevents double taxation. The OECD Model favours residence-country taxation, the UN Model gives more to the source country, and the US Model has its own anti-abuse features. Solve questions by identifying the model, the article and the facts.

What this chapter covers

This chapter introduces the templates on which most tax treaties are built. A model tax convention is not a treaty. It is a draft text that two countries can adopt, change or reject when they negotiate a double taxation avoidance agreement (DTAA). The chapter covers the OECD Model, the UN Model, the US Model, and how a treaty is read once it is signed.

The core idea is the split of taxing rights between the residence country (where the person lives or is based) and the source country (where the income arises). The OECD Model leans towards the residence country. The UN Model leans towards the source country, which matters for developing countries that receive more investment than they send out. The US Model reflects the United States' own treaty policy, including its limitation-on-benefits and anti-abuse approach.

This chapter is the base for the rest of International Taxation in the paper. When you later study treaty articles such as permanent establishment, business profits, royalties and fees for technical services, you will keep asking which model the rule comes from and how the models differ. It also links to the domestic provisions of the Income-tax Act, 2025 on relief for foreign tax and the use of the more beneficial of the Act and the treaty. Read the model chapter first and the later chapters will feel easier.

This chapter is mostly conceptual, so it rewards clear understanding over heavy calculation. Questions are often short, theory-based or case-scenario based: a fact pattern is given and you must say which model or approach applies, why the treaty position differs, or how a term should be interpreted. Comparison questions between the OECD and UN Models are a natural fit for written answers, and MCQs can test one distinguishing point. Since the concepts also feed into later treaty and permanent establishment topics, a solid grasp here saves effort across the paper and helps in Paper 6 case studies with cross-border facts.

Overview of Model Tax Conventions: topics in the order to study them

  1. 1OECD Model Tax Convention OverviewStart here because it is the most widely used template and the baseline against which the other models are compared.
  2. 2UN Model Tax Convention OverviewStudy it second so you see how it adjusts the OECD structure to favour the source country.
  3. 3Difference Between OECD and UN ModelsDo this only after both models are clear, because the comparison is built on the points you have just learned.
  4. 4US Model Tax Convention and Treaty InterpretationFinish with the US approach and the rules on reading treaties, which apply to all models and tie the chapter together.

How to prepare Overview of Model Tax Conventions

Treat this chapter as a comparison exercise. Build one clear picture of how each model allocates taxing rights, then practise applying it to short facts.

  1. Read the OECD Model first and note its structure: scope, definitions, taxing rights over each type of income, methods for eliminating double taxation, and special provisions such as non-discrimination and mutual agreement.
  2. Write one line for each model on whose taxing right it favours: residence country or source country. Keep this as your anchor for every later point.
  3. Read the UN Model and mark only where it departs from the OECD Model. Do not relearn the whole structure.
  4. Make a two-column comparison table in your notes (on paper or in a notes app) covering each point of difference. Revise it until you can reproduce it from memory.
  5. Read the US Model for its distinctive features, especially its anti-abuse approach, and then the principles for interpreting treaties, including the role of commentaries and the meaning of terms not defined in the treaty.
  6. Practise short case scenarios: given two countries and a type of income, state the model logic, the likely allocation of taxing right and the reason. Write answers in the form of rule, facts and conclusion.
  7. In the last week, revise only your comparison table and one-line points, and attempt a few MCQs to check that you can pick the single correct distinguishing feature.

Common mistakes in Overview of Model Tax Conventions

  • Treating a model convention as if it were a treaty in force.

    Fix: Remember that only the signed bilateral treaty applies. The model is a drafting template and a guide to interpretation.

  • Mixing up which model favours the source country and which favours the residence country.

    Fix: Write the anchor line in your notes: OECD leans residence, UN leans source. Test every difference against it.

  • Learning differences as a random list without reasons.

    Fix: For each difference, add the reason: developing countries want wider source-based taxing rights. Reasons make points easy to recall and to write in an answer.

  • Giving a general answer without applying it to the facts in a case scenario.

    Fix: Practise writing rule, facts and conclusion. Name the countries and income type in your conclusion.

  • Ignoring treaty interpretation and the US Model as minor topics.

    Fix: Give them proper revision time. Interpretation principles apply to every treaty question and the US features are easy marks if known.

  • Quoting article numbers or details from memory without being sure of them.

    Fix: Use only the article numbers and terms you have checked in your study material. A correct principle with clear reasoning scores better than a wrong number.

Last-day revision: Overview of Model Tax Conventions

  • A model tax convention is a template for bilateral treaties, not a binding treaty itself.
  • Its main aims are to prevent double taxation and to allocate taxing rights between countries.
  • Residence country taxes based on where the person is resident; source country taxes based on where income arises.
  • The OECD Model generally favours the residence country.
  • The UN Model generally favours the source country, which suits capital-importing developing countries.
  • The UN Model departs from the OECD Model mainly in business profits, permanent establishment and service-related provisions.
  • The US Model reflects US treaty policy and puts weight on anti-abuse and limitation-on-benefits rules.
  • Commentaries on the models are used as aids when interpreting treaty text.
  • Under OECD Article 3(2), a term not defined in the treaty is read with reference to the domestic law of the state applying the treaty, unless the context requires otherwise. Separately, Section 90(3) of the Income-tax Act, 1961 lets the Central Government notify the meaning of a term used in the agreement but not defined in the Act or the agreement, provided the meaning is not inconsistent with the treaty. The Income-tax Act, 2025 replaces the 1961 Act from 1 April 2026 and carries the corresponding provision.
  • In any answer, first name the model, then the article or principle, then apply it to the facts.
  • In India, under Section 90(2) of the Income-tax Act, 1961 (and the corresponding provision of the Income-tax Act, 2025), the assessee may choose the Act or the treaty, whichever is more beneficial. GAAR and other anti-abuse provisions can still apply.

Overview of Model Tax Conventions practice questions

Overview of Model Tax Conventions in other exams

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

Overview of Model Tax Conventions: frequently asked questions

What is a model tax convention?

It is a standard draft text that countries use as a starting point to negotiate bilateral tax treaties. It is not binding by itself. The final treaty can follow it closely or depart from it.

What is the main difference between the OECD and UN Models?

The OECD Model leans towards taxation by the residence country, while the UN Model gives more taxing rights to the source country. The UN Model is designed with developing countries in mind. Learn the specific points of difference from your study material and attach this reason to each.

Is this chapter more theory or numerical?

It is mainly theory. Expect short written answers and case-scenario MCQs where you apply a principle to given facts. You need clear comparisons and reasoned conclusions more than calculations.

How should I study the US Model?

Study it after the OECD and UN Models. Focus on what makes it distinctive, especially its anti-abuse approach, and note that it reflects one country's treaty policy. Do not try to relearn the whole structure.

How much time should I give this chapter?

It is a compact chapter, so a few focused sessions are usually enough for a first read. Spend extra time on the comparison table and on practising short case scenarios, then revise it briefly before the exam.