Tax Residency: What It Is and How It Is Determined

What tax residency means for your taxes

Tax residency sets the rules for which country gets to tax your worldwide income and capital gains. It's usually about where you actually live, not where your bank account is or what citizenship you hold. Some people pay taxes in places where they've never even set foot, but that's rare and tied to special cases.

Every country has its own method for working out who counts as resident. Sometimes the guidance doesn't match up, so you can end up a resident in two places at once. That's where double tax treaties step in, often choosing the country where you keep a home you can return to year-round.

If you're trying to figure out when something is a capital gain or income after you become resident, see capital gains vs income tax.

Common tests countries use to decide residency

Day counting is a widespread rule: spend more than a certain number of days, such as 183, in a country in the year, and you may trigger tax residency. But that's not the only rule. Permanent homes matter. So does the location of your immediate family and where your social and economic life is centered (what's called your center of vital interests). Some authorities also look at habitual living patterns, or even nationality.

If different tests point to different countries, a double tax treaty typically chooses for you. Some treaties apply the rules in an order that's set in writing, which can mean the answer surprises people who go by intuition alone.

The United States has its own system. US citizens and green card holders get taxed on income from anywhere on the planet, whether they've lived in the States recently or not. That means residence doesn't always decide who taxes you if you have US status.

Why holding money abroad does not make you resident

Just opening a bank account or keeping investments in another country doesn't normally mean that country now treats you as resident. But your home country might still ask you to report the account. That's a separate requirement, without changing your residency status.

Most countries tax their residents on every dollar or euro earned worldwide, not just what's earned within their borders, and only tax non-residents on money that's tied to their territory. Moving to a new country can shift where you owe taxes on future profits, which is why some countries apply an exit tax on any deemed gains you haven't yet realized when you leave.

Suppose you split your year between two countries

Say you spend 200 days in Country A and lease an apartment there. In Country B you stay 120 days but own a house, and your family keeps living there. Country A's day count rule would typically make you resident. However, Country B might still claim you as resident based on that family home and those ties being your real center of life.

If there's a tax treaty between A and B, it'll break the tie, using its own tests and sometimes reaching an answer that doesn't just follow the day count.

Frequently asked questions

Does spending 183 days in a country make me a tax resident?

It often does, but not every time. Plenty of countries use 183 days as the threshold for established residency, while others need more than just the day count, such as a permanent place to live, or other links. Some countries count even part-days, so you'll want to check local definitions wherever you spend time.

Can I be a tax resident in two countries at once?

Yes, that's possible. Because each country's tests work on their own, you can wind up resident in both for the same tax year. In that case, a double tax treaty, if there is one, uses its own set of tie-breaker rules to choose which country treats you as a resident under the treaty. But both can still claim certain tax rights on some kinds of income. For anything complex, check with the tax authority or a qualified tax adviser.