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

Double Taxation: Meaning, Causes and Relief Methods

Updated 11 October 2026 · Fact-checked

Double taxation means the same income is taxed twice, in the hands of the same person or of different persons, usually by two countries. It arises from residence-based and source-based taxation overlapping. Relief comes through the exemption, credit or deduction method, under a treaty (section 159) or unilaterally (section 160).

Understand Double Taxation: Meaning, Causes and Relief Methods

Double taxation means the same income is taxed more than once. Think of a person who earns income in one country but lives in another. Both countries may want to tax that income. Without relief, the total tax can become very heavy and discourage cross-border trade and investment.

It arises because countries use two links to claim tax. Under the residence rule, a country taxes a person on global income because the person lives or is based there. Under the source rule, a country taxes income because it arises or is earned within its territory. When one country applies the residence rule and another applies the source rule to the same income, both tax it. Double taxation also occurs when both countries treat the person as resident, or both treat the income as having their source.

There are two types. Juridical double taxation is the same income taxed in the hands of the same person by two or more countries, for the same period. Economic double taxation is the same income taxed in the hands of different persons. Company profits taxed in the company and again as dividend in the shareholder's hands is the usual example.

Relief has two routes. Bilateral relief comes from an agreement between India and another country or specified territory under section 159. Unilateral relief comes from the domestic law under section 160 where no agreement exists. Treaties commonly use three methods: exemption, credit and deduction.

Under the exemption method, the residence country does not tax the foreign income at all. Under the credit method, it taxes the income but allows the foreign tax as a credit against its own tax. Under the deduction method, the foreign tax is only deducted from income as an expense, so relief is the smallest.

Key rules to remember

Purposes of an agreement (section 159(3))
Relief + avoidance of double taxation + exchange of information + recovery of tax
The avoidance purpose must not create non-taxation or reduced taxation through evasion or avoidance, including treaty-shopping.
Beneficial provision rule (section 159(4))
For an assessee covered by an agreement, the Act applies to the extent it is more beneficial
Section 159(6) says the provisions of Chapter XI (anti-avoidance) apply even if not beneficial.
Non-resident's claim condition (section 159(8))
Residence certificate from the other country + prescribed documents and information
Both are needed before a non-resident can claim treaty relief.
Unilateral relief (section 160(1))
Relief = foreign income × lower of (Indian rate, foreign rate)
Applies where no section 159 agreement exists. If rates are equal, use the Indian rate. Relief is a deduction from Indian tax payable.
Indian rate of tax (section 160(3)(c))
Indian income-tax (after reliefs under the Act, before this Part's relief) ÷ total income
Average rate, not marginal rate.
Rate of tax of the said country (section 160(3)(d))
Tax actually paid in that country (before its double-tax relief) ÷ whole income as assessed there
Also an average rate.
Credit method (concept)
Tax payable in residence country = tax on global income − foreign tax credit
Credit is normally limited to the residence country's tax on that income.

How to solve Double Taxation: Meaning, Causes and Relief Methods questions

Use this method for any theory or numerical question on double taxation and its relief.

  1. 1Identify the income, the person and the two countries involved. Note which country claims residence and which claims source.
  2. 2State why double taxation arises: residence versus source, or dual residence, or dual source.
  3. 3Classify it as juridical (same person) or economic (different persons).
  4. 4Check whether an agreement under section 159 exists with the other country. If yes, apply the treaty and the more beneficial rule in section 159(4).
  5. 5If no agreement exists, apply section 160. Compute the Indian rate and the foreign rate as average rates.
  6. 6Take the lower of the two rates, apply it to the doubly taxed income, and deduct the result from Indian tax payable.
  7. 7For a non-resident claiming treaty relief, confirm the residence certificate and documents under section 159(8).
  8. 8Write a one-line conclusion stating the relief and the method used.

Quickest way: Rate comparison shortcut for section 160

When to use it: Use when a numerical question gives Indian tax, total income, foreign income and foreign tax, and says no agreement exists.

  1. Compute Indian rate = Indian tax ÷ total income.
  2. Compute foreign rate = foreign tax ÷ foreign income as assessed there.
  3. Pick the lower rate.
  4. Relief = lower rate × doubly taxed income.
  5. Net Indian tax = Indian tax − relief.

Common mistakes in Double Taxation: Meaning, Causes and Relief Methods

  • Treating juridical and economic double taxation as the same thing.

    Both involve income taxed twice, so the labels blur.

    Fix: Ask one question: is the taxpayer the same? Same person means juridical. Different persons means economic.

  • Giving full foreign tax as relief under section 160.

    Students assume credit equals the foreign tax paid.

    Fix: Relief is the lower of the Indian rate and the foreign rate, applied on the doubly taxed income.

  • Using the marginal rate instead of the average rate.

    Slab rates make the top rate look like the rate of tax.

    Fix: Use the definitions in section 160(3): tax divided by total income, and foreign tax divided by foreign income.

  • Applying section 160 when a treaty exists.

    Students skip checking for a section 159 agreement.

    Fix: Section 160 applies only to countries with which there is no agreement under section 159. Check this first.

  • Saying the Act always overrides or always yields to the treaty.

    The beneficial rule is remembered loosely.

    Fix: Under section 159(4), the Act applies to the extent it is more beneficial to the assessee. Chapter XI applies regardless, under section 159(6).

  • Mixing up exemption, credit and deduction methods.

    All three reduce the burden, so they sound alike.

    Fix: Exemption: foreign income not taxed at home. Credit: foreign tax set off against home tax. Deduction: foreign tax treated only as an expense.

Worked examples

Example 1

Mr. Rohan Mehta, a resident in India, earns ₹10,00,000 from a country with which India has no section 159 agreement. He pays tax of ₹1,50,000 there on that income as assessed. His total income is ₹30,00,000 and Indian tax (after reliefs under the Act, before this relief) is ₹6,00,000. Find the relief and net Indian tax.

Show the solution
  1. No agreement exists, so section 160(1) applies.
  2. Indian rate = 6,00,000 ÷ 30,00,000 = 20%.
  3. Foreign rate = 1,50,000 ÷ 10,00,000 = 15%.
  4. Lower rate = 15%.
  5. Relief = 15% × 10,00,000 = ₹1,50,000.
  6. Net Indian tax = 6,00,000 − 1,50,000 = ₹4,50,000.

Answer: Relief is ₹1,50,000 and net Indian tax is ₹4,50,000.

Example 2

Priya Nair, a resident in India, earns ₹8,00,000 abroad in a non-treaty country, where she paid ₹2,40,000 tax on that income as assessed. Her total income is ₹20,00,000 and Indian tax (before this relief) is ₹3,00,000. Compute the relief and explain why it is not the full foreign tax.

Show the solution
  1. Section 160(1) applies because there is no agreement.
  2. Indian rate = 3,00,000 ÷ 20,00,000 = 15%.
  3. Foreign rate = 2,40,000 ÷ 8,00,000 = 30%.
  4. Lower rate = 15% (the Indian rate).
  5. Relief = 15% × 8,00,000 = ₹1,20,000.
  6. Net Indian tax = 3,00,000 − 1,20,000 = ₹1,80,000.
  7. The excess foreign tax of ₹1,20,000 is not relieved in India, because relief is capped at the Indian rate.

Answer: Relief is ₹1,20,000 and net Indian tax is ₹1,80,000. Relief is capped by the lower rate, so the full ₹2,40,000 is not allowed.

Exam tips

  • Define double taxation, then give both causes (residence and source) before the relief methods. Examiners reward that order.
  • In numerical questions, first state whether section 159 or section 160 applies. This earns marks even if arithmetic slips.
  • Show the Indian rate and foreign rate as separate lines. Marks are often given per step.
  • For case-based questions, write provision, analysis of facts, conclusion. Quote the section 159(8) residence certificate condition when the claimant is a non-resident.
  • Do not claim exemption or credit method details as Indian law unless the question states the treaty wording.

Practice questions from Double Taxation Avoidance Agreement (DTAA)

Double Taxation: Meaning, Causes and Relief Methods in other exams

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

Double Taxation: Meaning, Causes and Relief Methods: frequently asked questions

What is the difference between juridical and economic double taxation?

Juridical double taxation is the same income taxed in the hands of the same person by more than one country. Economic double taxation is the same income taxed in the hands of different persons, such as company profits taxed in the company and again as dividend in the shareholder's hands.

How does double taxation arise from residence and source rules?

One country taxes global income because the person is resident there. Another taxes the same income because it arises in its territory. Both claims overlap on the same income, so it is taxed twice.

What are the methods of relief from double taxation?

The main methods are exemption, credit and deduction. Exemption leaves the foreign income untaxed at home. Credit allows foreign tax against home tax. Deduction only allows foreign tax as an expense.

When does section 160 apply instead of section 159?

Section 160 applies where a resident has paid tax in a country with which there is no agreement under section 159. Relief is calculated at the lower of the Indian rate and the foreign country's rate on the doubly taxed income.

Can a non-resident always claim treaty relief?

No. Under section 159(8), a non-resident must obtain a residence certificate from the government of that country or specified territory and provide the prescribed documents and information.