Double tax treaties and Czechia: how they stop two countries taxing you

Suppose a software developer living in Prague receives royalties from a publisher in the United States, a pension from Germany and rent from a flat in Bratislava. Three countries could each claim a slice. Without some referee, the same euro of income could be taxed twice, and international work, investment and retirement would be a lot less attractive. The referee is the double tax treaty (smlouva o zamezení dvojího zdanění), a bilateral agreement that most developed economies have been signing for a century.

This piece explains how treaties work in general, not what any particular treaty says. Each one is a separate text, and the Ministry of Finance publishes them.

What a treaty actually does

A treaty does two things. It decides which country may tax a given kind of income, and it tells the other country how to avoid taxing the same income again. It does not create a tax, and it does not exempt you from filing. It can only limit what the two states could otherwise do under their own laws.

Almost all treaties follow a model drafted by the OECD, with a United Nations model used more by developing countries. The shared structure explains why a treaty with Austria and a treaty with Japan feel familiar. Articles define who is a resident, what a permanent establishment is, and then deal with each type of income in turn: business profits, dividends, interest, royalties, employment, pensions, capital gains. The numbers, and sometimes the wording, vary.

Where Czechia sits

Czechoslovakia signed tax treaties before 1989, and the Czech Republic has expanded the network since. Under the Constitution, a ratified and promulgated international treaty that Parliament has approved takes precedence over an ordinary law that conflicts with it. So if the Income Tax Act says 15% and the treaty says 10%, the treaty rate applies to a qualifying recipient. Our explainer on Czech withholding taxes shows where this bites.

The Ministry of Finance keeps a current list of treaties in force, with texts in Czech and often in English. The list changes when a treaty is renegotiated, so use it, not an old article.

Who qualifies: residency

Treaties protect residents of one or both states, so the first question is always residence. The domestic tests are described in our piece on Czech tax residency. If both countries treat you as resident, the treaty applies a tie-breaker: permanent home, centre of vital interests, habitual abode and nationality, then a mutual agreement between the authorities.

A person who is resident of only one state for treaty purposes can ask the authorities of that state for a certificate. Foreign payers, banks and tax authorities will often refuse a reduced rate without one.

The two ways of avoiding double tax

Once the treaty has decided that one state has the main right to tax, the residence state removes the overlap in one of two ways.

The exemption method means the residence state leaves the income out of its tax base, though it may take it into account in deciding the rate on the rest. The credit method means the residence state taxes the income but gives a credit for the tax paid in the source state, limited to the amount of its own tax on that income.

Neither method works on its own. You also have to claim relief on your return, with proof of the foreign tax paid. A foreign tax receipt, a certificate of withholding or a statement from the payer often serves.

Passive income and the beneficial owner

Dividends, interest and royalties usually get a capped rate in the source state. A treaty may allow 10% or 15% where domestic law says more. The reduced rate, however, goes to the beneficial owner, meaning the person who actually enjoys the income and not a conduit passing it on. Treaties and EU directives alike are wary of structures built only to reach a lower rate.

Since the OECD's multilateral convention (MLI), which Czechia signed in 2017, many treaties include a principal purpose test: a benefit can be denied if obtaining it was one of the main purposes of an arrangement. In practice that means you need commercial reasons for your structure and records to prove it.

Permanent establishment

A business with no Czech presence normally pays Czech tax on its profits only if it has a permanent establishment here: a fixed place of business such as an office or a factory, or in some cases a dependent agent who concludes contracts in its name. A foreign company that sends staff to Prague for a long project can create one without noticing. The treaty defines the threshold, and national law and practice fill in the detail.

Employees, pensioners and artists

Treaties give special rules to income from employment, pensions, directors' fees, and performers and sportspeople. The employment article usually lets the home country keep taxing short-term work abroad if the employee is present for less than 183 days, the employer is not resident in the work country and the costs are not borne by a local branch. Treaties differ over how the days are counted, so a calendar-year count and a rolling twelve-month count can give different answers.

Pensions are often taxed in the country of residence, though government pensions, social security and private pensions can be treated differently. Anyone retiring between countries should read the pension article of the relevant treaty, as well as our note on the Czech pension system for expats.

Reading a treaty

Most treaties follow the OECD model's order, which makes them easier to navigate once you know it. Article 4 defines who is a resident. Article 5 defines a permanent establishment. Article 7 covers business profits. Articles 10, 11 and 12 deal with dividends, interest and royalties, and Article 13 with capital gains. Article 15 covers employment income, Article 18 pensions. Near the end, one article sets out how double taxation is removed, another bars discrimination against nationals of the other state, and others set up the mutual agreement procedure and the exchange of information. The numbering varies between treaties, but the sequence is usually recognisable.

Check also for a protocol or a later amendment. A treaty from the 1990s may have been updated, and the consolidated text on the Ministry of Finance site is the one to use.

What the treaty does not do

It does not remove the obligation to report. It does not cover social security, which is coordinated by other agreements or by EU rules. It does not apply to taxes outside its scope: VAT, for example, is usually excluded. And it does not help a person who is not resident of either state. If the other country has no treaty with Czechia, domestic relief rules still often give some credit for foreign tax, but with less certainty.

Common mistakes

Assuming a treaty rate applies without paperwork. Reading a treaty from an old consolidated source and missing a later protocol. Using the wrong residency for the treaty test. Counting days wrongly for the employment article. And treating a treaty as a reason not to file, when its main function is to tell you what to put on the return.

Frequently asked questions

Does a tax treaty mean I pay no tax at all on foreign income?

Not necessarily. It decides which country has the first right to tax and how the other removes the overlap. You may still pay tax in one of them.

How do I know whether Czechia has a treaty with my country?

Check the list of treaties on the Ministry of Finance website.

Do I need a certificate to claim a reduced withholding rate?

Almost always. The payer usually wants proof of residency and, for passive income, confirmation that you are the beneficial owner.

This is a general explainer, not legal or tax advice.