Tax return filing deadline 2026: complete guide

The tax return filing deadline 2026 is one of the most critical dates in the French corporate tax calendar. Late filing exposes companies to automatic penalties, while a poorly prepared return can trigger an in-depth audit by the DGFiP. Whether your financial year ends on December 31 or any other date, this guide provides exact deadlines, applicable forms, and best practices for filing with confidence.

In brief: For a company closing on December 31, 2025, the tax return filing deadline 2026 is set at May 5, 2026 (paper) or May 20, 2026 via EDI-TDFC electronic filing, thanks to the additional 15-day period. This deadline applies to forms 2065 (corporate tax), 2072 (real estate companies) and 2031 (BIC/BNC). Dates vary depending on your financial year-end.

The DGFiP professional tax calendar determines filing deadlines based on two parameters: the form concerned and the financial year-end date. Here are the référence dates for the main situations:

The calculation rule is as follows: the tax return must be filed within three months of the financial year-end, or before the second business day following May 1 for years ending December 31. The additional 15-calendar-day period automatically applies to companies that file electronically through a chartered accountant or an approved EDI-TDFC provider.

Consult the official calendar at impôts.gouv.fr - Tax calendar.

Form 2065 is the tax return for companies subject to corporate income tax (SARL, SAS, SA, SASU, EURL opting for IS, SELARL, SELAS, etc.). It is the centerpiece of the tax return and includes, in addition to the main form, numerous mandatory annexes.

Essential annexes for form 2065#

A tax return 2065 is not limited to the main form. Depending on your activity and situation, you must attach:

• 2050 to 2059: tables of fixed assets, depreciation, provisions and capital gains;
• 2058-A: détermination of taxable income (reintegration and deduction of non-déductible expenses);
• 2059-A and 2059-B: table of results from subsidiaries and shareholdings;
• 2067: tax credit table (CIR, CII, CICE for relevant years);
• 2079: table of financial flows with related companies.

Each annex must be consistent with the others. An inconsistency between the depreciation schedule (2051) and the taxable income (2058-A) is a classic red flag for DGFiP control algorithms.

The link between form 2065 and corporate tax balance#

Be careful not to confuse the tax return filing deadline with the corporate tax balance payment deadline. For companies closing on December 31, 2025, the corporate tax balance is due at the same time as the return filing, no later than May 20, 2026 by electronic payment. For more on all tax deadlines, see our article on Taxation and déclarations: VAT, IS, advance payments.

Not all companies file form 2065. Depending on your legal structure and tax régime, the tax return filing deadline 2026 concerns other forms.

Form 2072: SCI and partnerships#

Form 2072 is the tax return for real estate investment companies (SCI) and partnerships not subject to corporate tax. Partners then declare their share of results in their personal income tax return (form 2042 C).

The filing deadline for form 2072 follows the same calendar as 2065: May 5, 2026 for years ending December 31, 2025, May 20, 2026 for electronic filing. Form 2072 is accompanied by form 2072-S (détermination of each partner's share) and, where applicable, form 2048-IMI (real estate capital gains).

Form 2031: BIC and 2035: BNC#

Sole proprietorships under the standard real taxation régime file:

• form 2031 for industrial and commercial profits (BIC);
• form 2035 for non-commercial profits (BNC).

These déclarations follow the same calendar: three months after the financial year-end, with the additional 15-day period for electronic filing.

The general rule is simple: the tax return must be filed within three months of the financial year-end. But this rule has important adjustments.

The three-month rule#

For a year ending:

• December 31: deadline March 31, extended to the first business day after May 1 → May 5, 2026;
• January 31: deadline April 30 → electronic filing possible until May 15, 2026;
• February 28: deadline May 31 → electronic filing possible until June 15, 2026;
• March 31: deadline June 30 → electronic filing possible until July 15, 2026.

The additional 15-day period for electronic filing#

Article 1683 bis of the French Tax Code grants an additional 15-calendar-day period to taxpayers who file electronically. This applies when the return is transmitted via an approved EDI-TDFC provider, which is the case in virtually all situations where a chartered accountant is involved.

In practice, this additional period transforms a May 5 deadline into a practical date of May 20 for December 31 year-ends. This is a considerable advantage, but it does not exempt you from preparing the return on time. Your accountant needs time to verify accounts before electronic transmission.

Failure to meet the tax return filing deadline 2026 has financial and legal consequences that every business owner should know.

Penalties for late filing#

In case of late filing of the tax return, the DGFiP applies the following sanctions:

• 10% surcharge on the tax due (Article 1738 of the CGI);
• in the absence of tax due, a flat fine of €150 or 9% of undeclared profits, whichever is higher (Article 1758 of the CGI);
• in case of total absence of déclaration after formal notice, the surcharge rises to 40% (Article 1728 of the CGI).

Risk of ex officio taxation#

Beyond simple late filing, failure to file a tax return can lead to ex officio taxation. The administration then estimates your taxable profit, usually upward, and you lose the benefit of VAT deduction rights and actual expense deductions.

Practical case: the real cost of a delay#

Take the example of a SARL owing €15,000 in corporate tax that files its return one month late. The 10% surcharge represents €1,500 in penalties. If the company does not respond to a formal notice, the surcharge rises to 40%, or €6,000. These penalties are added to late interest (0.20% per month, or 2.40% per year). The total cost of a delay can quickly exceed several thousand euros.

Anticipating the preparation of your tax return is the best way to meet the tax return filing deadline 2026 without stress or errors. Here are the key steps we recommend to our clients.

Account review before year-end#

Ideally, tax return preparation begins well before the year-end date. We recommend an interim closing at 9 months (end of September for a December 31 year-end) to:

• verify the consistency of accounts with current bookkeeping;
• identify sensitive items requiring specific tax treatment;
• anticipate tax decisions (provisions, exceptional depreciation, loss carryforwards).

Key checkpoints before electronic filing#

Before transmitting your return to the DGFiP, every élément must be controlled:

• annex consistency: the fixed assets table (2051) must match accounting entries;
• FEC (Fichier des Écritures Comptables): it must be reliable, complete, and compliant with Article A. 47 A-1 of the LPF;
• VAT consistency: figures declared in the return must be consistent with annual CA3 returns;
• provisions and impairments: they must be justified and documented (probable and quantifiable risks);
• tax credit integration: CIR, CII, tax credits — each credit must be correctly filled in annex 2067.

Hayot Expertise Advice: The real mistake is not only filing late. It is submitting a return on time with inconsistent annexes, an unreliable FEC, or undocumented tax decisions. A tax audit doesn't just penalize delays: it penalizes inconsistencies.

We secure the production of the tax return, the calendar, the annexes and the vigilance points before electronic transmission. Our service covers a complete account review, justification of sensitive items, inter-déclaration consistency checks, and on-time electronic filing.

Entrust your tax return to Hayot Expertise

(Official sources: impôts.gouv.fr - Professional tax calendar 2026, BOFiP - Corporate reporting obligations, service-public.fr - Results déclaration, Légifrance - Article 1683 bis CGI)