When Do You Become a French Tax Resident? The Tests, the Year of Arrival and the US-France Treaty (2026)

You become a French tax resident, which French law calls having your “domicile fiscal” in France, when you meet any one of three tests: your home or your main place of stay is in France, you work in France, or the centre of your economic interests is in France. Your visa is not one of the tests, and neither is a number of days on its own. This guide sets out each test as the official pages state it, what happens in the year you arrive, and what the US-France tax treaty does when both countries claim you. Pages read on 20 October 2026.

For filing the French return itself, read the guide to the French income tax return for Americans. For the whole picture of two tax systems, start with the guide to US taxes while living in France.

The Rule: Three Tests, One Is Enough

Article 4 B of the Code général des impôts, in force since 16 February 2025, says that these persons have their tax domicile in France:

• those who have their home (foyer) or their main place of stay there;
• those who carry on a professional activity there, employed or not, unless they show that it is only incidental;
• those who have the centre of their economic interests there.

The article adds that a person who meets at least one of these tests cannot be treated as domiciled in France when a tax treaty means they are not regarded as a resident of France. The administration’s own guidance says the same of the criteria: it is enough that one is met (BOFiP, BOI-IR-CHAMP-10, paragraph 310). Nothing in the article refers to a visa, a residence permit or a nationality, and service-public states the tests for anyone, French or not.

The Tests One by One

Source: Légifrance, CGI article 4 B, service-public, Comment déterminer son domicile fiscal (verified 1 January 2026), BOFiP, BOI-IR-CHAMP-10 (current version, in force since 28 July 2016).

Two points where the pages read differently

The 183 days. Service-public states the main place of stay as at least 183 days in the year. BOFiP states the general rule as more than six months and then says the period is not absolute: the Conseil d’État has set it aside where the facts showed a main stay in France, for instance a person who spent clearly more time in France than in each of several other countries. Read the figure as a marker the administration uses, not as a threshold below which the other tests stop applying, since the home test, the work test and the economic test each stand alone.

The BOFiP text is older than the article. The current BOFiP page dates from 2016 and lists the same tests; the 2025 amendment to article 4 B (a presumption for the heads of French-based companies with a turnover above 250 million euros) is in the article and on service-public, not in that page.

Spouses and partners

The tests are applied to each person. BOFiP says that married or PACS partners are in principle taxed jointly in France, whatever their nationality, when either of them meets a test. If only one meets it, the household’s French tax covers all the income of the partner who is domiciled in France and the French-source income of the other, subject to treaties. Service-public gives the same rule for a partner who has their tax domicile outside France under a tax treaty.

What Residency Changes

Article 4 A gives the consequence in two sentences: persons with their tax domicile in France are liable to income tax on all of their income, and those whose tax domicile is outside France are liable only on their French-source income. For you, this means that once you are domiciled in France, the French return covers your US income as well as your French income, subject to the treaty.

The United States does not step back. The IRS says that a US citizen or resident living outside the United States generally files income, estate and gift tax returns in the same way as someone living in the United States, and that gross income from worldwide sources decides whether a return is due (IRS, filing requirements for citizens and residents abroad). How the two returns fit together, with the credit for French tax, is the subject of the guide to the foreign tax credit and Form 1116. State income tax rests on state residency, a separate test, covered in the guide to breaking state residency.

The Year You Arrive

Two official sources speak to the first year.

• Article 166 of the tax code: when a taxpayer previously domiciled abroad transfers their domicile to France, the income that this establishment of domicile brings is counted only from the day the domicile is established (Légifrance, article 166).
• BOFiP: the six-month rule does not apply to the income of the year in which a taxpayer acquires a domicile in France; the taxation follows article 166 (BOI-IR-CHAMP-10, remark under paragraph 150).

The tax office’s page for people arriving in France (impots.gouv.fr, last modified 17 December 2025) describes the filing for someone with no French tax obligation before the move:

• In year N+1, the year after you arrive, you declare your income online or, failing that, on paper on form 2042, to the Service des impôts des particuliers of your new home.
• You declare all the income received from the date of your arrival to 31 December of year N, with the annexes your income calls for, such as form 2044 for property income and form 2047 for income received abroad.
• If you declare your income or assets in France for the first time, the page says you have no access to the online declaration and must file on paper.
• If you had French-source income taxable in France before you came, you were in principle attached to the non-resident tax service. The part of the year before the move goes on form 2042-NR and the part after on form 2042, and you are taxed as a non-resident for the first part and as a resident for the second.

The pages read do not say how the day of establishment is fixed in a given case, so for a move with overlapping dates, ask the tax office or an adviser rather than counting days.

When Both Countries Claim You: The Treaty

The US-France income and wealth tax treaty (consolidated text of the 1994 convention as amended by the protocols of 2004 and 2009, published by the French tax administration) has its own definition of residence in article 4.

• Who is a resident. A person who is liable to tax in a state by reason of domicile, residence, place of management, registered office or any similar criterion. A person taxed in a state only on income from sources there is not a resident.
• US citizens and green card holders. France treats a US citizen or green card holder as a US resident for the treaty only when that person stays mainly in the United States, or would be a US resident and not a resident of a third state under the article’s principles.
• The tie-breaker. When a person is a resident of both states, the treaty settles it in this order: the state where the person has a permanent home; if there is one in both, the state with which the personal and economic ties are closer (centre of vital interests); if that cannot be determined or there is no permanent home in either, the state where the person habitually lives; if both or neither, the state of nationality; if the person has both nationalities or neither, the two tax authorities decide by mutual agreement.

French law gives the treaty the last word: article 4 B itself says that a person who meets a test is not domiciled in France if a treaty regards them as not resident, and BOFiP says that the rule of international law always prevails over domestic law.

Treaty residence does not release a US citizen from US tax. Under article 29(2) the United States may tax its residents and its citizens as if the treaty did not exist, with exceptions listed in paragraph 3, among them article 24 on the elimination of double taxation. The Form 1116 guide explains how the US credit for French tax is claimed.

What This Guide Does Not Settle

The pages read do not answer several questions a real move raises, so none is answered here: how the administration fixes the day a domicile is established when you split a year between countries, how a person living in France on a visitor visa with a remote US job is assessed under the work and economic tests, and the US-side form for claiming a treaty position. A case that sits between two tests is one for the tax office or an adviser. The 90/180-day guide covers the separate, immigration question of how long you may stay.

Questions to Put to Your Own Dates

These follow from the tests above and decide which one applies to you.

• Where does your household (spouse, partner, children) usually live, and is that residence permanent?
• If you live alone, where do you usually live apart from work trips?
• How many days will you spend in France in the calendar year, and where else?
• Where is your main activity, in time and in income?
• Where are your main investments, the seat of your business and the place you administer your property from?
• From which day do you count yourself established in France, and what income do you receive before and after it?

FAQ

Is 183 days the rule for French tax residency?

Service-public gives at least 183 days in the year as the main place of stay. It is one of the tests, not the only one: BOFiP says the six-month period is not an absolute criterion and the Conseil d’État has looked at the facts, and a person whose home, work or economic interests are in France is domiciled there whatever the number of days.

Does my visa decide whether I am a French tax resident?

Article 4 B lists three tests and none is a visa or residence permit. The tests turn on where your home is, where you stay, where you work and where your economic interests are.

I arrive in October. Do I declare that year’s income?

The tax office says you declare it in the following year: all income received from the date of your arrival to 31 December, and the page says a first-time declarant files on paper. Article 166 of the tax code counts the income from the day the domicile is established.

Can I be a tax resident of both France and the United States?

Each country applies its own rules and can claim you, and the treaty then uses its ordered tie-breaker tests: permanent home, closer personal and economic ties, habitual abode, nationality, and mutual agreement. The treaty does not stop the United States from taxing its citizens, which is why the credit for French tax matters.

Do I stop filing US returns when I become a French resident?

No. The IRS says US citizens and residents abroad generally file in the same way as people living in the United States, and the treaty lets the United States tax its citizens as if the treaty did not exist, with the exceptions in article 29(3).

Conclusion

French tax residency is not granted or refused by a visa. It follows from where your home or main stay is, where you work and where your economic interests are, and one test is enough. In the year you arrive, the income is counted from the day you establish your domicile in France, and the tax office asks for it the following year. If you are an American, the second tax system stays in place, and the treaty tells you which country comes first only where both claim you. Tax residency is one of the subjects covered in a Consulting Call.