Residency vs citizenship vs domicile: what each one decides

What this covers

These four ideas are often mixed up because the same word, resident, is used for several of them. Immigration residence comes from a visa or permit under immigration law. Tax residence comes from tax law tests such as days present, a home or the center of economic interests. Domicile is a legal concept, strongest in common law systems such as the UK, that ties a person to a permanent home and can matter for some taxes and private law. Citizenship, or nationality, comes from birth, descent, naturalization or another route in nationality law, and usually brings a passport and political rights.

Compare the four statuses side by side

The table sets out who decides each status, what it usually gives and how it usually ends. Details vary by country, and a single person can hold different statuses in different countries at the same time.

Know what immigration residence gives

Immigration residence is permission to stay. It comes as a visa, a residence permit or permanent residence. USCIS, for example, describes a green card as a permanent resident card that allows you to live and work permanently in the United States. In the EU, the European Commission says a non-EU national who has lived legally in an EU country for an uninterrupted period of five years can obtain long-term resident status, with conditions on income and health insurance.

Residence permits give rights in one country, not citizenship. They usually do not give a passport or the right to vote in national elections. Investor and remote work permits are covered in golden visas in Europe and digital nomad visas compared, and the wider topic in the living base flag.

Separate tax residence from your permit

Tax residence is a tax law status, decided by each country's own tests. Spain's tax agency says a person can hold a residence permit or administrative residence in a state and still not be tax resident there. Spain treats a person as resident after more than 183 days in the calendar year, or if the main base of their activities or economic interests is in Spain. See Spain.

This works both ways. You can be tax resident without any permit, for example as a citizen living at home, and you can hold a permit somewhere without becoming tax resident there. People who move often should read digital nomads and tax residency. Two countries can also both treat you as resident in the same year. See tax residence, the 183-day rule and when two countries claim you.

A US green card is a case where immigration status drives tax status. IRS Publication 54 says a lawful permanent resident at any time in the calendar year is a US resident under the green card test, and US residents are generally taxed on worldwide income. See green card holders abroad.

Understand domicile and why it lasts longer

Domicile is meant to be more permanent than residence. GOV.UK says your domicile is usually the country your father considered his permanent home when you were born, and that it may have changed if you moved abroad and do not intend to return.

For UK income tax, domicile mattered much less after 6 April 2025. GOV.UK says that before that date UK residents whose permanent home was outside the UK did not have to pay UK tax on foreign income in some cases, and that from that date UK residents who meet its conditions may claim foreign income and gains relief instead. It also says there are additional rules for domicile and inheritance tax. See the non-dom entry, the UK FIG regime guide and United Kingdom.

Other legal systems use similar words for different things. In civil law countries, domicile can simply mean a registered address. Check what the word means in the law you are reading.

Know what citizenship adds

Citizenship is membership of a state. It usually gives a passport, the right to enter and live in the country, consular help abroad, and the right to vote. It can also bring duties such as military service. See the citizenship flag, second citizenship basics, citizenship by descent and naturalization.

Holding two citizenships is allowed in some countries and not in others. GOV.UK says dual citizenship is allowed in the UK, that many countries do not accept it, and that a dual national cannot get diplomatic help from the British government while in their other country of citizenship. See dual citizenship.

Watch for citizenship-based taxation in the United States

In most countries, citizenship has no direct tax effect. The United States is the main exception. IRS Publication 54 says the worldwide income of a US citizen or resident alien is generally subject to US income tax regardless of where they live. The IRS says US citizens and residents abroad generally must file income, estate and gift tax returns if their worldwide income meets the filing threshold.

That means a US citizen can be tax resident in another country and still file in the United States. Treaties and credits may reduce double tax, but they do not remove the filing duty. See citizenship-based taxation, US citizens abroad and United States.

Check how each status affects voting and passports

Passports follow citizenship, not residence. A permanent resident usually travels on the passport of their own country, with the residence card as proof of the right to return.

Voting rights also follow citizenship in national elections, but countries treat citizens abroad differently. GOV.UK says British citizens who previously lived in the UK can register as overseas voters for UK Parliament elections and must renew the registration every three years. USA.gov says US citizens abroad who used to live in the United States can vote absentee using the Federal Post Card Application, and must know their voting residence, while citizens born abroad who never lived there may not be able to.

For a US citizen abroad, the state used as a voting residence is a separate question from state tax residence. Ask a tax adviser whether voting from a former state address could matter for that state's tax rules. See state taxes after moving abroad.

Common misconceptions

Questions to take to a professional

1. Which countries could treat me as tax resident this year, whatever permits I hold?
2. Does my immigration status anywhere, such as a green card, create a tax status as well?
3. Where is my domicile under the law of each country that might use the concept, and does it matter for any tax there?
4. Do I hold, or could I hold, a citizenship that brings tax or military duties?
5. If I give up a permit or a citizenship, what formal steps and tax consequences follow?
6. Could registering to vote at a former address affect any tax position?

Questions people ask

Sources

• Agencia Tributaria: Persona física residente en EspañaOfficial guidance
• Green Card (USCIS)Official guidance
• Long-term residents (European Commission, Migration and Home Affairs)Official guidance
• Tax on foreign income: Non-domiciled residents (GOV.UK)Official guidance
• Dual citizenship (GOV.UK)Official guidance
• Publication 54, Tax Guide for U.S. Citizens and Resident Aliens AbroadOfficial guidance
• U.S. citizens and residents abroad: Filing requirements (IRS)Official guidance
• Voting when you're abroad (GOV.UK)Official guidance
• Absentee voting (USA.gov)Official guidance