Ask most people when you become a French tax resident and they will say "183 days". That is not how France tax residency actually works. Under Article 4B of the French tax code you are resident if any one of four tests applies: your family home is in France, France is your principal place of stay, you mainly work there, or your economic life is centred there. One test is enough, and the household test regularly catches people who spend most of the year abroad. Here is how the four tests work in 2026, and how to keep a day count that actually proves your position.
How France decides residency: four tests, any one is enough
France defines tax residence (domicile fiscal) in Article 4B of the General Tax Code. You are a French tax resident for a calendar year if any of the following applies:
- Your foyer is in France - the household home where your family habitually lives - or, failing a foyer, France is your principal place of sojourn (lieu de sejour principal), which is where the famous 183-day figure comes in.
- You carry on a professional activity in France, salaried or self-employed, unless you can show it is merely ancillary to your main activity elsewhere.
- France is the centre of your economic interests - your main investments, the seat of your business, or the place the bulk of your income comes from.
The tests are alternatives, not a checklist: the tax authority only needs to win on one. The stakes are high because residents are taxed on worldwide income, plus French social levies, while non-residents are taxed only on French-source income.
The foyer: the household test that catches families first
The foyer is where your household - you, your spouse or PACS partner, and your children - habitually and permanently lives. It is the test the authorities reach for first, and it has nothing to do with counting your own days. If your family home stays in France, you can spend most of the year working abroad and still be a French tax resident, because temporary absences for work do not move the foyer.
This is the trap that catches cross-border commuters and rotational workers: a contract in Dubai or Singapore, 250 days out of France, but a spouse and children in Lyon means the foyer test is met on day one. Residency is assessed per person, so spouses can genuinely hold different statuses - but expect the tax office to presume the family home wins unless the facts clearly show your own home life is established elsewhere. If you are single with no dependants, the analysis usually slides straight to the day-count test below.
Principal place of sojourn: where 183 days actually fits
Only if the foyer test does not settle things does France look at your lieu de sejour principal, your principal place of stay. This is where the 183-day figure lives, and even here it is a rule of thumb rather than a statutory bright line:
- 183 days or more in France in a calendar year (1 January to 31 December) and you are treated as having your principal sojourn there. Hotel stays count; you do not need to own or rent a home.
- Fewer than 183 days can still be enough. Case law says that if you spent more days in France than in any other single country - say 150 in France, 120 in Spain, 95 elsewhere - France can still be your principal place of stay.
- Every day of presence counts in practice: arrival and departure days, weekends, holidays and short business trips back in.
The second point changes what you need to track. A France-only tally cannot prove your principal stay was elsewhere; you need a credible day count for every country in the year, so you can show the comparison, not just the French total. See how the 183-day rule works globally for how other countries handle the same threshold.
Work and money: the two tests people forget
The last two tests need no day counting at all. You are resident if you carry on a professional activity in France, employed or self-employed, unless you can show it is ancillary - a sideline, not your main activity. Your main activity is the one you devote the most effective time to, or failing that the one producing the bulk of your income. Since 2019 there is also a special rule for executives: run a company headquartered in France with revenue above 250 million euros and you are deemed to work in France unless you prove otherwise.
Finally, you are resident if France is the centre of your economic interests: your main investments, the seat of your business, the place you administer your assets, or simply the source of the majority of your income. This one catches landlords with a French property portfolio and retirees living abroad whose only meaningful income is a French pension. It is deliberately elastic, which is why leaving France cleanly usually means moving your economic life, not just your suitcase.
Calendar year, treaties and the 2025 law change
France measures everything against the calendar year. There is no rolling window in the domestic residency test, and returns for a year are filed the following spring, typically May to June. In arrival and departure years, residency in practice starts or ends on the day you move, with the year split between resident and non-resident treatment.
If France and another country both claim you, the double-tax treaty decides. Most French treaties use the OECD cascade - permanent home, centre of vital interests, habitual abode, nationality, then mutual agreement - explained in our guide to tie-breaker rules. Since the Finance Act for 2025, treaty primacy is written directly into Article 4B: if a treaty makes you a resident of the other country, France cannot treat you as tax-domiciled under its domestic tests. A treaty can shield you from double taxation - but only if your day evidence supports the residency you are claiming.
Track France tax residency automatically on your iPhone
Every French test ultimately leans on facts you should be recording now: where you were, how long, and can you prove it. Tax Residency Tracker builds that record continuously:
- Automatic GPS day counting logs a dated stay every time you cross a border, even with the app closed - and it counts every country in parallel, which is exactly what the principal-sojourn comparison needs: your French days next to your days everywhere else.
- Real-time 183 countdown shows your French total for the calendar year and how many days remain before the threshold, alongside every other country you visit.
- Threshold alerts warn you before you cross a line, so a quietly accumulating French count never surprises you in December.
- Planned-stay previews let you add a future trip to Paris or Nice and see the projected year-end totals before you book.
- Schengen 90/180 card tracks the separate rolling short-stay limit that non-EU visitors must respect across France and the rest of the Schengen Area.
- Documents and CSV export attach boarding passes, hotel bills and receipts to each stay, then export a dated stays-and-days record for your accountant or an audit.
- Private by design: everything is processed on your device and never uploaded, so your location history stays yours.
The default 1 January tax year matches France exactly, so your French count is scoped to the right window out of the box.
Frequently asked questions
My spouse and children live in France but I work abroad. Am I resident?
Very likely yes under the foyer test, even if you personally spend far fewer than 183 days in France. Your household's home is in France, and work absences do not move it. A double-tax treaty may still tie-break you to your work country, but you will need strong evidence of your home and life there.
If I stay under 183 days in France, am I safe?
No. You can be resident with fewer days if France is still the country where you spent the most days in the year, or through the work or economic-interest tests, or through your family's foyer. Under 183 days is necessary for the day-count route, but it is not sufficient on its own.
What period does France count days over?
The calendar year, 1 January to 31 December. There is no rolling residency window. The separate Schengen 90/180 rule for non-EU short-stay visitors is a rolling window, though, so many visitors need to watch both at once.
Does a tax treaty override the French tests?
Yes. Since the Finance Act for 2025, Article 4B itself says you cannot be treated as French tax-domiciled if a treaty makes you a resident of the other country. Your day records feed directly into the treaty's habitual-abode tie-breaker.
Next, see the 183-day rule explained, how the Schengen 90/180 rule works, Spain's 183-day rule, or browse all tax-residency guides.