Double Taxation Relief and Tax Treaties Explained

Without any coordination between countries, the same income could be taxed twice — once by the country where it was earned, and again by the country where the earning company or individual is resident. Bilateral tax treaties between pairs of countries prevent this double taxation through mechanisms like a foreign tax credit (the home country reduces its own tax bill by the amount already paid abroad) or an outright exemption for certain foreign-sourced income. Treaties also define which country has the primary right to tax specific types of income (dividends, royalties, interest) and typically set reduced withholding tax rates on cross-border payments between treaty countries compared to each country’s standard domestic rate.

Withholding taxes are where treaties pay off most visibly. The US taxes dividends, interest and royalties paid from US sources to a foreign corporation at a flat 30% of the gross amount (26 U.S.C. §881). The 2016 US Model Income Tax Convention cuts the dividend rate to 5% for a company owning at least 10% of the payer and 15% in other cases. On a $10 million dividend that is $10,000,000 × 30% = $3,000,000 without a treaty, $500,000 at 5%: a $2,500,000 difference.

Treaties also decide when a foreign company’s business profits become taxable at all. The test is the permanent establishment (PE): a fixed place of business through which the company carries on its business, such as an office, branch or factory; a building or construction site that lasts longer than the treaty’s period (twelve months in the US Model); or a dependent agent acting for the company. Without a PE, a foreign seller’s business profits are taxed only at home, however much it sells into the country. Before 2015 groups avoided PEs with “commissionaire” arrangements, in which a local affiliate sold in its own name without formally concluding contracts for the principal. Article 12 of the BEPS multilateral convention closes this: a dependent agent who “habitually plays the principal role leading to the conclusion of contracts” that are routinely concluded without material modification creates a PE. Article 14 stops groups from splitting a construction project into short contracts held by related companies to stay under the time limit.

Treaty shopping is routing income through a company in a country with a favorable treaty, purely to claim treaty rates its real owners could not claim. There are two defenses. The US uses limitation on benefits (LOB) articles (Article 22 of the US Model): mechanical tests of ownership, listing and active business that a company must pass to qualify. Most other countries rely on the principal purpose test (PPT), which denies a benefit “if it is reasonable to conclude, having regard to all relevant facts and circumstances, that obtaining that benefit was one of the principal purposes of any arrangement or transaction,” unless granting it matches the treaty’s purpose. The PPT reached the world’s treaty network through the Multilateral Instrument (MLI), concluded in Paris on November 24, 2016, and in force since July 1, 2018, which amends existing bilateral treaties without renegotiating each one; more than 100 jurisdictions have signed. The United States is not a party and relies on LOB clauses in its bilateral treaties.

When two countries tax the same profit, the treaty’s mutual agreement procedure (MAP) lets their tax authorities negotiate it away. In 2024 MAP cases on transfer pricing took 30.9 months on average to close worldwide, and about three-quarters of all cases closed that year ended with the issue fully resolved. To avoid the dispute altogether, a company can seek an advance pricing agreement (APA): a binding agreement with one tax authority (unilateral) or two (bilateral) on the method for future years. The IRS executed 110 APAs in 2025, with a median of 41.6 months to complete, and had 622 pending at year-end; India (35%) and Japan (25%) were the largest partners among bilateral APAs executed.