France determines tax residency under Article 4B of the Code général des impôts (CGI) using four independent tests — meeting just ONE makes you French tax resident, subject to any overriding tax treaty. There is no single 183-day shortcut in domestic law, though spending more than 183 days in France in a calendar year automatically satisfies the 'principal place of stay' test. The other three tests (household/foyer, professional activity, center of economic interests) can trigger residency well before 183 days.
Test 1 — Household (foyer): your spouse/partner and minor children habitually live in France, even if you personally travel abroad for work.
Test 2 — Principal place of stay: France is the country where you spend the most time; if present >183 days in a calendar year, tax domicile is automatically in France.
Test 3 — Professional activity: you carry out your professional activity in France (employed or not), unless purely accessory.
Test 4 — Center of economic interests: the location of your main investments, business seat, or the source of most of your income.
Meeting only ONE of the four tests is sufficient to be treated as a French tax resident, absent an overriding double tax treaty.
Steps
Check the household test first — If your spouse/children live in France, you are likely resident regardless of your own travel.
Count days only as a secondary check — 183+ days is sufficient but not necessary — residency can trigger sooner via the other three tests.
Check for an overriding tax treaty — If a treaty exists between France and your other country of residence, its tie-breaker rules can override the domestic 4B result.
Common Mistakes
Assuming a 183-day threshold is required for French tax residency — it is only one of four independent, sufficient tests.
Ignoring the household (foyer) test — a family living in France can make someone tax resident even if they personally spend most of the year working abroad.