Under the OECD Model Convention, the residence State generally relieves double taxation. However, exceptions shift this obligation to the State hosting a permanent establishment (PE). First, if the residence State is also the source of income attributable to the PE, the PE State must credit the residence State’s source tax. Second, in “triangular cases” where a PE earns income from a third State, the PE State must relieve the third-State tax by extending domestic unilateral relief to the PE via non-discrimination principles, or through specific treaty clauses. Practitioners must carefully account for these exceptions in their cross-border financial models.
I. THE GENERAL RULE
1. The architecture of double taxation relief under the OECD Model Convention rests on a simple division- the State of source taxes first, and the State of residence relieves. Articles 23A (exemption method) and 23B (credit method) apply only to the State of residence (State R). They oblige that State either to exempt income which the Convention permits the other Contracting State to tax, or to credit the tax paid in the other State against its own levy. Paragraph 8 of the Commentary on the said Articles makes this explicit by stating that the Articles “apply only to the State of residence and do not prescribe how the other Contracting State has to proceed.”
2. This general rule, however, is not without exceptions. Paragraphs 9 to 10 of the Commentary on Articles 23A and 23B, read with paragraphs 67 to 70 of the Commentary on Article 24, identify situations in which the obligation to extend relief travels away from the residence State and settles, wholly or partly, on the State in which a permanent establishment (PE) is situated. Two fact patterns dominate this discussion: first, where the residence State is itself the State of source; and second, the classic “triangular case” where income flows from a third State to a PE.
II. FIRST EXCEPTION — RESIDENCE STATE AS SOURCE STATE (PARAGRAPH 9)
3. Paragraph 9 of the Commentary on Articles 23A and 23B deals with the situation where a resident of State R derives income from State R itself through a PE in the other Contracting State (State E). Under Article 7(1) read with Article 21(2), State E may tax such income (other than income from immovable property situated in State R) if it is attributable to the PE. Remarkably, State R must still give relief under Article 23A or 23B for the income attributable to the PE, notwithstanding that the income originally arises in State R.
4. The Commentary then carves the true exception. It provides that where the Contracting States agree to preserve for State R a limited right to tax dividends or interest within the ceilings of Articles 10(2) and 11(2) as would have been taxed by a Source State, the two States “should also agree upon a credit to be given by State E for the tax levied by State R, along the lines of paragraph 2 of Article 23A or of paragraph 1 of Article 23B.” In other words, it is the PE State and not the residence State that extends the credit for the source tax of the residence State.
5. Paragraph 9.1 adds a wrinkle for exemption-method treaties. Where State R applies Article 23A (dealing with exemption method), the combination of Articles 7 and 23A prevents State R from taxing the dividends or interest even as the State of source, although had the same income been paid to a resident of the other State, State R could have taxed it at the rates in Articles 10(2) and 11(2). The Commentary then provides that States finding this unacceptable may insert a clause preserving State R’s source taxation, with State E giving a corresponding credit, though no credit is due if State E, under its domestic law, does not tax the dividends or interest attributed to the PE.
6. The working appended to this article (Sheet “Paragraph 9”) illustrates the rule with an Indian flavour. In the said example, India is the residence State and also the source State of interest of Rs.100. The enterprise has a PE in Sri Lanka to which the interest is attributable. Sri Lanka taxes the PE profits of Rs. 600 (revenue Rs.1,000 less expenses Rs.400) at 20 per cent, i.e. Rs.120. We may assume that India retains a limited source right of 10 per cent on the gross interest, i.e. Rs.10 under the India-Sri Lanka DTAA. [The assumptions have been made solely for illustrative purposes and are not based on the respective domestic laws of the States and the inter-se treaty position between them]
7. Sri Lanka, as PE State, grants the credit contemplated by paragraph 9 of Commentary on Articles 23A and 23B at the lower of the Indian tax on the interest (Rs.10) and the Sri Lankan tax attributable to that interest (Rs.100 × 60% profit ratio × 20% = Rs.12), i.e. Rs.10, leaving a net Sri Lankan tax of Rs.110 (i.e. 120- 10). India, as residence State, then taxes the interest (Rs.10) and the balance PE profits of Rs.540 (i.e. Rs.900 * 60% profit ratio) at 30 per cent (Rs.162), giving credit for the proportionate Sri Lankan tax of Rs.99 (Rs.110 × 900/1,000), restricted to the Indian tax thereon. The net Indian tax is Rs.73 (10+162-99) and the aggregate burden across both States is Rs.183 (110+73). Double taxation stands relieved, but only because each State performed a crediting function: Sri Lanka for India’s source tax, and India for Sri Lanka’s PE tax.

| Illustration I —
Paragraph 9 (amounts in Rs.) |
Sri Lanka (E) | India (R) |
| Tax before credit | 120 | 172 (10 + 162) |
| Credit granted | 10 (for Indian source tax) | 99 (for Sri Lankan PE tax) |
| Net tax | 110 | 73 |
| Aggregate tax in both States | 183 |
III. SECOND EXCEPTION — THE TRIANGULAR CASE (PARAGRAPH 10)
8. Paragraph 10 of OECD Commentary on Articles 23A and 23B addresses the triangular configuration- a resident of State R derives income from a third State (State S) through a PE situated in State E. State E may tax the income attributable to the PE (Articles 7(1) and 21(2)), and State R must give relief under Article 23A or 23B for the income attributable to the PE. So far, the general rule holds. The difficulty lies elsewhere in as much as the Convention between R and E contains no provision obliging State E to relieve the tax levied by the third State (State S) where the income arises. The PE thus risks bearing third-State withholding tax with no treaty avenue for credit in the State that actually taxes it on a net basis.
9. The Commentary supplies the answer through the non-discrimination Article i.e. under Article 24(3). By applying such non-discrimination provision the Commentary requires that any relief provided under the domestic laws of State E (double taxation conventions excluded) for its own residents must equally be granted to a PE in State E of an enterprise of State R. Paragraph 10 expressly cross-refers to paragraphs 67 to 72 of the Commentary on Article 24.
IV. THE ARTICLE 24 DIMENSION — PARAGRAPHS 67 TO 70
10. Paragraph 67 of the Commentary on Article 24 states the principle: when foreign income is included in the profits attributable to a PE, it is right to grant the PE credit for the foreign tax borne by such income when such credit is granted to resident enterprises under domestic law. This is the equal-treatment obligation in action. On the basis of the said principle of equal treatment a unilateral relief provision under the domestic law of State E [which may be similar to section 91 of the Income-tax Act, 1961] cannot be confined to its’ residents.
11. Paragraph 68 confronts the harder case. What if State E’s domestic law grants no unilateral credit and relief flows only from tax conventions? The PE is not a “person” and not a “resident”, and is therefore not itself entitled to the benefits of State E’s conventions with third States (State S). Paragraph 69 frames the resulting question for dividends and interest received by the PE from a third State: whether, and to what extent, the PE State should credit the third-State tax that cannot be recovered.
12. Paragraph 70 records the consensus that double taxation does arise and some method of relief should be found. It observes that most member countries can grant credit on the basis of domestic law or of Article 24(3) itself. However it also provides that, States that cannot grant credit under their domestic law owing to absence of such a credit mechanism thereunder, or that wish to clarify the position, may supplement Article 24(3) with wording that permits the PE State (State E) to credit the third-State tax (State S) “by applying the rate of tax provided in the convention between the State of which the enterprise is a resident and the third State”, subject to a ceiling: the credit “shall not exceed the amount that an enterprise that is a resident of the first-mentioned State can claim under that State’s convention with the third State.” If the unrecoverable tax under the treaty or convention between State R and the third State (i.e. State S) is lower than that under the treaty or convention between State E and third State (State S), only the lower tax is credited. The PE, in effect, receives the less favourable of the two treaties, which amounts to a floor of protection and not a charter for treaty shopping.
V. THE TRIANGULAR CASE IN NUMBERS
13. The second and third sheets of the workings model the triangle with India as residence State (30 per cent), a PE in Sri Lanka (20 per cent) and interest of Rs.100 arising in Bangladesh suffering withholding at 25 per cent (Rs.25). PE profits are Rs.600 on revenue of Rs.1,000. [Again these assumptions are for illustrative purposes and do not represent the actual position under the respective domestic laws and the inter-se treaty position between the States.]
14. Route one — domestic-law relief (Sheet “Paragraph 10 of Commentary on Articles 23A and 23B read with Paragraph 67 on Article 24”). Sri Lanka is assumed to have a unilateral relief provision similar to section 91 of the Income Tax Act, 1961. Its tax of Rs.120 is reduced by credit at the lower of the Bangladesh rate (25%) and its own effective rate (12%), applied to the doubly taxed interest of Rs.100 resulting in a credit of Rs.12, leaving net Sri Lankan tax of Rs.108 (120-12). By applying Article 24(3), this domestic relief must be extended by Sri Lanka to the Indian enterprise’s PE. India then levies Rs.180 on the income inclusive of interest, allowing credit of Rs.18 for the Bangladesh tax (lower of Rs.25 and the Indian tax attributable to such interest of Rs.18) and Rs.108 for the Sri Lankan tax. The total foreign tax credit thus extended by India would be Rs.126 (Rs.108 + Rs.18), resulting in net Indian tax Rs.54 (180-126). Aggregate outflow across the three States would be Rs.187 (25+108+126).
15. Route two — the paragraph 70 treaty clause (Sheet “Paragraph 10 of Commentary on Articles 23A and 23B read with Paragraph 70 of Commentary on Article 24”). Here Sri Lanka is assumed to have no unilateral relief under its’ domestic law, but the India–Sri Lanka treaty contains the clause suggested by paragraph 70 of the Commentary on Article 24. Sri Lanka computes the credit under the India–Bangladesh treaty (Rs.18, being the lower of Rs.25 being Bangladesh Tax on interest and the Indian tax attributable to the interest) and caps it at what its own resident could claim under the Sri Lanka–Bangladesh treaty (Rs.12, being the lower of Rs.25 and the Sri Lankan tax attributable to the interest income). The credit is the minimum of the two i.e. Rs.12, and the net Sri Lankan tax is again Rs.108 (120-12). The Indian computation is unchanged, and the aggregate outflow is again Rs.187.
| Illustration II — Triangular case (amounts in Rs.) | Para 10 (Art. 23A and 23B) r.w. Para 67 (Art 24) route | Para 10 (Art. 23A and 23B) r.w. Para 70
(Art 24) route |
| Tax in Bangladesh (source) | 25 | 25 |
| Sri Lanka: tax before credit | 120 | 120 |
| Sri Lanka: credit for Bangladesh tax | 12 (s. 91-type relief) | 12 (treaty clause) |
| Sri Lanka: net tax | 108 | 108 |
| India: tax before credit | 180 | 180 |
| India: total foreign tax credit (18 + 108) | 126 | 126 |
| India: net tax | 54 | 54 |
| Aggregate tax outflow | 187 | 187 |
16. Two features of the illustrations deserve emphasis. First, in both routes the PE State’s credit is rate-capped at its own effective tax attributable to the doubly taxed income (12 per cent), so a residue of Bangladesh tax (Rs.13) remains unrelieved at the PE level. This difference however gets absorbed downstream while computing the tax credit given by India as State of residence as India being the State of residence extends credit for the taxes paid in Sri Lanka. However, with respect to taxes paid in Bangladesh, India does not extend full credit of Rs.25 (being the tax paid in Bangladesh on interest), but limits it to the Indian tax attributable to such interest being Rs.18. The difference of un-credited Bangladesh Tax of Rs.7 (i.e. 25-18) has resulted in the aggregate burden of Rs.187 exceeding the tax of Rs.180 (i.e. Rs.1000 * 60% profit percentage * 30% being tax rate in India) that a pure residence taxation would have produced. Relief in triangular cases is real but imperfect. Secondly, the paragraph 70 clause and a section 91-type domestic provision converge on the same result in this fact pattern, which is precisely its design i.e. to place PEs on par with, but not better than, local residents.
VI. CONCLUSION
17. The proposition that the residence State alone bears the burden of relieving double taxation is accurate only as a first approximation. Paragraph 9 of the Commentary on Articles 23A and 23B shows that where residence and source converge in one State and the income is attributable to a PE in the other, the PE State must credit the residence State’s source tax. Paragraph 10 of Commentary on Articles 23A and 23B, read with paragraphs 67 to 70 of the Commentary on Article 24, shows that in triangular cases the PE State must extend to the PE whatever unilateral relief its domestic law gives its own residents, or may by treaty bind itself to a credit capped at the less favourable of the two relevant conventions.
18. For Indian practice the lessons are concrete. Indian enterprises with foreign PEs earning Indian-source interest or dividends should examine whether the PE State has granted the paragraph 9 credit before computing relief under section 90 read with relevant article of the applicable treaty. Conversely, where a foreign enterprise operates a PE in India that receives third-country income, Article 24(3)-type non-discrimination clauses oblige India to extend section 91-type relief to that PE on par with residents. In triangular structures, the residual, unrelieved sliver of source-State tax is a costing reality that deserves a line in every cross-border financial model. The general rule tells us who usually pays for relief, the exceptions remind us that in treaty law, as in life, the burden does not always fall where one first expects.
WORKINGS AS PER PARAGRAPH 9 OF 2017 OECD COMMENTARY ON ARTICLES 23A AND 23B
Nature of case: There is a convergence of residence and source in the same State and income is effectively connected with a PE in the other State.
Assumptions made:
1. India is the resident State. India is also the source State inasmuch as interest is arising in India.
2. Enterprise has a PE in Sri Lanka and interest is attributable to such PE and is taxed as business profits in Sri Lanka at say 20%.
3. India has limited taxing rights under the Indo–Sri Lanka Treaty to tax the interest at a lower rate of say 10% on gross basis.
| Tax on PE profits in Sri Lanka | |
| PE revenue | 1,000 |
| Less: PE expenses | 400 |
| PE profits | 600 |
| Tax at 20% | 120 |
| Tax on Interest income in India | |
| Interest | 100 |
| Tax at 10% | 10 |
| Tax on reworked PE profits in India | |
| PE revenue (excluding interest) | 900 |
| Less: Proportionate PE expenses (i.e. 400 × 900/1000) | 360 |
| PE profits | 540 |
| Tax at 30% | 162 |
| Tax in Sri Lanka as per Paragraph 9 of OECD Commentary | |
| Tax on PE profits | 120 |
| Less: Credit for Indian tax paid on interest included in PE profits in accordance with Article 23B(1) | |
| 1) Income tax paid in India on interest income (i.e. interest of Rs. 100 × 10% being tax rate in India) | 10 |
| 2) Income tax payable in Sri Lanka which is attributable to interest income taxed in India (i.e. interest of Rs. 100 × 60% being profit percentage × 20% being tax rate in Sri Lanka) | 12 |
| Lower of the two amounts eligible for tax credit | 10 |
| Net tax in Sri Lanka | 110 |
| Tax in India | |
| Tax on Interest [A] | 10 |
| Tax on PE profits | 162 |
| Less: Credit of Sri Lankan tax paid on PE profits | |
| 1) Income tax paid in Sri Lanka on PE profits [Rs. 110 being total tax paid in Sri Lanka × (Rs. 900 being income other than interest / Rs. 1000 being total income)] | 99 |
| 2) Income tax payable in India which is attributable to PE profits taxed in Sri Lanka [Since income of Rs. 900 is taxed both in India and Sri Lanka, the tax of Rs. 162 which is paid in India on such income of Rs. 900 is considered] | 162 |
| Lower of the two amounts eligible for tax credit | 99 |
| Net Tax on PE profits [B] | 63 |
| Net Tax in India [A] + [B] | 73 |
| Total tax in India and Sri Lanka | 183 |
WORKINGS AS PER PARAGRAPH 10 OF 2017 OECD COMMENTARY ON ARTICLES 23A AND 23B READ WITH PARAGRAPH 67 OF 2017 OECD COMMENTARY ON ARTICLE 24
Nature of case: Income derived by a resident of Residence State (R), from a source in Source State (S) but is considered as income of a PE situated in a Third State (€).
Assumptions made:
1. India is the resident State. India taxes profits as a resident State at full rate (assuming 30%).
2. Enterprise has a PE in Sri Lanka and interest is attributable to such PE and is taxed as business profits in Sri Lanka at 20%.
3. The interest is derived from a third State say Bangladesh (source State). Tax rate in Bangladesh presumed at 25%.
4. It is presumed that Sri Lanka has a provision similar to section 91 of the IT Act, 1961 in its domestic law.
| Tax on profits in India | |
| Revenue | 1,000 |
| Expenses | 400 |
| Profits | 600 |
| Tax on profits at 30% | 180 |
| Tax on PE profits in Sri Lanka | |
| PE revenue | 1,000 |
| Less: PE expenses | 400 |
| PE profits | 600 |
| Tax at 20% | 120 |
| Tax in Bangladesh on interest income | |
| Interest | 100 |
| Tax at 25% | 25 |
| Tax in India | |
| Tax on profits | 180 |
| Less: Credit for Bangladesh tax paid on interest | |
| 1) Income tax paid in Bangladesh on interest income | 25 |
| 2) Income tax payable in India which is attributable to interest income taxed in Bangladesh [Rs. 100 × 60% profit percentage × 30% tax rate in India] | 18 |
| Lower of two amounts eligible for credit | 18 |
| Less: Credit for Sri Lanka tax paid on profits | |
| 1) Income tax paid in Sri Lanka [Rs. 108 being tax paid on income of Rs. 1000 is considered] | 108 |
| 2) Income tax payable in India [Rs. 180 being tax payable on income of Rs. 1000 is considered] | 180 |
| Lower of two amounts eligible for credit | 108 |
| Total FTC | 126 |
| Net Tax in India | 54 |
| Tax in Sri Lanka | |
| Tax on PE profits | 120 |
| Less: Credit as per provision similar to section 91 of ITA | |
| 1) Bangladesh Tax Rate [(Rs. 25 / Rs. 100 interest income taxable in Bangladesh) × 100] | 25 |
| 2) Sri Lanka Tax Rate [(Rs. 120 Sri Lanka Tax / Rs. 1000 total income) × 100] | 12 |
| Lower of two tax rates at which credit is available | 12 |
| Doubly taxed interest income | 100 |
| Eligible credit on doubly taxed income | 12 |
| Net Tax in Sri Lanka | 108 |
| Tax paid in Bangladesh | |
| Tax paid in Bangladesh | 25 |
| Total tax outflow in India, Sri Lanka and Bangladesh | 187 |
WORKINGS AS PER PARAGRAPH 10 OF 2017 OECD COMMENTARY ON ARTICLES 23A AND 23B READ WITH PARAGRAPH 70 OF 2017 OECD COMMENTARY ON ARTICLE 24
Nature of case: Income derived by a resident of Residence State (R), from a source in Source State (S) but is considered as income of a PE situated in a Third State (€).
Assumptions made:
1. India is the resident State. India taxes profits as a resident State at full rate (assuming 30%).
2. Enterprise has a PE in Sri Lanka and interest is attributable to such PE and is taxed as business profits in Sri Lanka at 20%.
3. The interest is derived from a third State say Bangladesh (source State). Tax rate in Bangladesh presumed at 25%.
4. It is presumed that Sri Lanka does not have a provision similar to section 91 of the IT Act, 1961 in its domestic law. However, it is presumed that the DTAA between India and Sri Lanka has a clause similar to that provided in paragraph 70 of the OECD Commentary on Article 24 which enables Sri Lanka to extend the credit available under the DTAA between India and a third State, subject to such credit not exceeding what is available as per the DTAA between Sri Lanka and such third State.
5. It is presumed that the tax rates at which credit is available in respective treaties is based on the rates mentioned above in respect of each jurisdiction.
| Tax on profits in India | |
| Revenue | 1,000 |
| Expenses | 400 |
| Profits | 600 |
| Tax on profits at 30% | 180 |
| Tax on PE profits in Sri Lanka | |
| PE revenue | 1,000 |
| Less: PE expenses | 400 |
| PE profits | 600 |
| Tax at 20% | 120 |
| Tax in Bangladesh on interest income | |
| Interest | 100 |
| Tax at 25% | 25 |
| Tax in India | |
| Tax on profits | 180 |
| Less: Credit for Bangladesh tax paid on interest | |
| 1) Income tax paid in Bangladesh on interest | 25 |
| 2) Income tax payable in India attributable to interest taxed in Bangladesh [Rs. 100 × 60% profit percentage × 30% tax rate in India] | 18 |
| Lower of two amounts eligible for credit | 18 |
| Less: Credit for Sri Lanka tax paid on profits | |
| 1) Income tax paid in Sri Lanka on profits [Rs. 108 being tax paid on income of Rs. 1000] | 108 |
| 2) Income tax payable in India on profits [Rs. 180 being tax payable on income of Rs. 1000] | 180 |
| Lower of two amounts eligible for credit | 108 |
| Total FTC | 126 |
| Net Tax in India | 54 |
| Tax in Sri Lanka | |
| Tax on PE profits | 120 |
| Less: Credit for Bangladesh tax paid on interest | |
| 1) Tax credit under Indo–Bangladesh DTAA | |
| a) Tax paid in Bangladesh on interest | 25 |
| b) Tax payable in India attributable to interest taxed in Bangladesh [Rs. 100 × 60% profit percentage × 30% tax rate in India] | 18 |
| Lower of two amounts eligible for tax credit [A] | 18 |
| 2) Tax credit under Sri Lanka–Bangladesh DTAA | |
| 1) Tax paid in Bangladesh on interest | 25 |
| 2) Tax payable in Sri Lanka attributable to interest taxed in Bangladesh [Rs. 100 × 60% profit percentage × 20% tax rate in Sri Lanka] | 12 |
| Lower of two amounts eligible for tax credit [B] | 12 |
| Tax credit eligible being minimum of [A] and [B] | 12 |
| Net tax in Sri Lanka | 108 |
| Tax paid in Bangladesh | |
| Tax paid in Bangladesh | 25 |
| Total tax outflow in India, Sri Lanka & Bangladesh | 187 |
This article is based on the 2017 OECD Model Tax Convention and Commentary: paragraphs 8, 9, 9.1 and 10 of the Commentary on Articles 23A and 23B, and paragraphs 67 to 70 of the Commentary on Article 24, with illustrative computations assuming Indian tax at 30%, Sri Lankan tax at 20%, Bangladesh withholding at 25% and an Indian limited source rate of 10% on interest. Figures are illustrative only and do not represent the actual domestic law positions and the inter-se treaty positions between the Contracting States referred to.


































































































