French tax for foreign nationals: what you file, and when

The tax question newcomers ask is how much. The question that actually costs money is what has to be declared, because the heaviest French penalties punish omission rather than avoidance.

France taxes its residents on worldwide income (article 4 A of the French tax code, residency itself being defined at article 4 B) and non-residents only on French-source income (article 164 B). Which side you fall on is not a choice: it follows from four alternative tests, and meeting any one of them is enough. Once you are resident, the annual French return covers far more than income. It also carries a declaration of the bank accounts, life assurance contracts, digital asset accounts and trusts you hold outside France, and those obligations attach to holding, not to earning.

That second layer is where newcomers get hurt. The fine set by article 1736 IV of the French tax code for an undeclared foreign bank account is €1,500 per account per year, and it is due whether or not the account produced a cent of income or a cent of tax. An omission also extends the period during which the tax authority may reassess you, from three years to ten. A dormant account left open in your home country, forgotten because it holds nothing, is the single most common file this firm sees.

The four things worth settling in the first year

The date you became resident, documented rather than declared. It splits the year of arrival in two and decides which income belongs to which half.
The treaty that applies to you, read article by article. A treaty does not exempt you generally; it allocates each category of income, and it specifies the method by which double taxation is relieved.
The full inventory of what you hold outside France, including accounts you no longer use. The obligation covers accounts opened, held, used or closed during the year.
Whether you qualify for the impatriate regime of article 155 B, which has to be organised around your arrival and cannot be claimed afterwards.

None of this requires you to become an expert in French tax. It requires the file to be built once, in the right order, in the first year. Corrections afterwards are possible, and they are more expensive than the original work. Your first French tax return, and how to get it right walks through that first filing in practice, and How to read the tax treaty that actually applies to you explains the document that decides most of these answers.

This page describes general mechanisms and does not constitute personalised tax advice. French filing deadlines vary by year and by department and are deliberately not reproduced here; they must be checked against the tax authority's own publication for the year in question. Rates, thresholds and allowances change with each finance act. Your treatment depends on the applicable treaty and on your personal situation.

Becoming a French tax resident Four alternative tests, any one of which is enough, and the treaty tie-breaker when two countries both claim you.Your first French tax return The tax number you do not yet have, the paper filing that often comes first, and the annexes almost every newcomer needs.Reporting foreign accounts and trusts The obligations that attach to holding rather than earning, and the penalties that follow omission rather than evasion.Reading your tax treaty Residence, allocation by category, and the two relief methods that produce very different bills.Reducing your French tax, in order Four levers ranked by what they save and what they risk. Most newcomers start at the bottom of the list.The French PER A deduction now against tax later, and the interaction with impatriate exemption that changes the arithmetic.Tax reduction schemes, and their cost Girardin, innovation funds and property deficits: what each buys, and which one can be recovered from you.

Frequently asked questions

Do I have to file a French return in my first year?

If you became a French tax resident during the year, then yes, for the part of the year from that date. The year of arrival is split: income from before your residency date is generally assessed under the non-resident rules on French-source income only, and income from after it under the resident rules on worldwide income. Both halves are reported, and the residency date you use has to be supportable by evidence, because it determines which income falls on which side.

What is the most expensive mistake newcomers make?

Failing to declare a foreign account, usually one that holds almost nothing and was forgotten rather than hidden. The fine set by article 1736 IV of the French tax code applies per account and per year, is due regardless of whether any income or tax was involved, and the omission extends the authority's reassessment window from three years to ten. Declaring an account costs nothing, takes a line on a form, and removes an exposure that compounds silently every year it goes unreported.

Do I need a French accountant, or can the firm handle this?

The two roles are different and both are legitimate. A chartered accountant or a lawyer prepares and signs filings and represents you in a dispute; this firm does not practise either profession and does not replace them. What it does is build the position that the filings then express: the residency date and its evidence, the treaty reading, the inventory of foreign holdings, the timing of income. Where an accountant is needed, the firm works alongside one rather than instead of one.

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Also worth reading: the White paper — Private Equity 2026 published by Private Equity Valley — Unlisted assets: selection, risks, access.

Written by Stéphane Molère, Président d'Éthique et Patrimoine — page last reviewed on 2026-08-30 — rules quoted are those in force at that date.