What is Tax Treaty?

A tax treaty (double-taxation agreement) is a bilateral or multilateral agreement between countries that allocates taxing rights over cross-border income and provides procedures to relieve double taxation, exchange information and resolve disputes.

There are more than 3,000 bilateral tax treaties in force globally, most based on the OECD Model Tax Convention. They cover income from employment, business profits, dividends, interest, royalties, real estate, capital gains and pensions. Each article allocates taxing rights between the source country and the residence country, with maximum withholding rates often reduced from domestic statutory levels.

Switzerland has treaties with more than 100 countries, including all major economies. The US-CH treaty reduces dividend withholding from 30% to 15% for portfolio investors and to 5% for substantial corporate holdings. The CH-DE treaty allocates pension taxation primarily to the residence country.

To benefit, the taxpayer must usually file a certificate of residence and a treaty claim form with the source country. Procedures vary: Form W-8BEN for US payments, formulaire 5000 for France, Antrag auf Freistellung for Germany. Failing to file usually means no treaty relief.

Example

A Swiss resident receives EUR 10,000 of French dividends. The default French withholding is 12.8%. By filing formulaire 5000 with the paying agent under the CH-FR treaty, the resident reclaims the excess above the treaty 15% cap, smoothing the residual into the Swiss tax credit.

Related terms

Double Taxation

Double taxation occurs when the same income or capital is taxed twice — most commonly by two different countries claiming taxing rights — and is mitigated through bilateral tax treaties and domestic relief mechanisms.

Tax Residency

Tax residency determines which country has the primary right to tax your worldwide income, based on rules such as days physically present, location of permanent home, centre of vital interests and family location.

Withholding Tax

Withholding tax is an amount that the payer (employer, bank, custodian) deducts from a payment to a beneficiary and remits directly to the tax authority on the beneficiary's behalf, as a prepayment of the beneficiary's eventual tax bill.

Transfer Pricing

Transfer pricing is the set of rules that determines the prices at which related companies within a multinational group charge each other for goods, services, intangibles and financing, requiring those prices to reflect what independent parties would have agreed (the 'arm's length principle').

Frequently asked questions

Does every country have a treaty with every other?+

No — coverage is patchy in Africa and Latin America. Without a treaty, only domestic unilateral relief applies.

How long does treaty relief take?+

Reduced rates apply at source if forms are pre-filed; refunds of over-withheld tax take 3–18 months.

Are treaties updated?+

Yes — the OECD BEPS multilateral instrument modified ~1,800 treaties to add anti-abuse rules.