Every entry below is the rule as France publishes it. It is a reference, not a calendar: where a deadline runs from something only you know, this page says so instead of showing a date.
This is the rule as published by the registry, checked against the primary source on the date shown. It is not your filing date. Where a deadline runs from incorporation, from a fiscal year the company itself elects, or from an event only you know about, no date can be derived here at all — the figure you see is the formula, not the answer. Extensions, transitional regimes and entity-specific exemptions are not reflected. Confirm with the registry before you rely on a date.
The French exercice social is not a statutory constant: the closing date is set in the company's articles and may be any date, so the financial year end is a value the user must supply. The calendar year is the common but not the compulsory choice, and the tax administration writes the rule in terms that presuppose the choice: the corporate income tax return is due «dans les trois mois de la clôture de l'exercice, lorsque la date de clôture n'intervient pas le 31 décembre», and «le 2e jour ouvré suivant le 1er mai N+1, si l'exercice coïncide avec l'année civile (N)». Two consequences follow. First, no deadline counted from the financial year end is shown here as a calendar number. Second, the deadlines in this jurisdiction run off three different clocks: the accounts-filing deadline runs from the shareholders' meeting that approves the accounts (itself within six months of the closing for an SARL or an SA), the income tax return runs from the closing, and the VAT return runs from the calendar VAT period and ignores the financial year entirely. The text of Code de commerce art. L.123-12 et seq., which governs the accounting period itself, was not read for this record.