Tax return filing deadline 2026: complete guide

The 2026 tax return filing deadline is 5 May 2026 on paper and 20 May 2026 by EDI-TDFC electronic filing, for a financial year ending 31 December 2025. Since electronic filing is mandatory, keep 20 May in mind. Year ending mid-year: three months after closing, plus 15 days.

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 reference 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.

In everyday language, the deadline to file the balance sheet and the tax return deadline are used interchangeably. They are in fact two distinct formalities, with two different recipients and two calendars.

Filing with the registry does not follow the tax calendar: the period runs from the general meeting approving the accounts, which must itself be held within six months of the year-end (Article L. 223-26 of the French Commercial Code for SARLs). In practice, for a year ending 31 December 2025 whose accounts are approved on 30 June 2026, the filing with the registry is due by 31 July 2026, or by 31 August 2026 electronically (Articles L. 232-22 and L. 232-23 of the French Commercial Code). The tax return itself had already been filed on 20 May.

The obligations specific to this second formality, including the confidentiality declaration, are covered in our article on filing annual accounts.

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: determination of taxable income (reintegration and deduction of non-deductible 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 (payment slip no. 2572) is due no later than May 15, 2026 (Article 1668, 2 of the CGI), i.e. five days before the EDI-TDFC filing deadline (May 20): these are two separate deadlines. For more on all tax deadlines, see our article on Taxation and declarations: VAT, IS, advance payments.

Three corporate tax deadlines overlap in spring 2026 for a 31 December 2025 year-end. Do not confuse them:

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Tax return filing (form 2065 + annexes): 20 May 2026#

The corporate tax return is filed via EDI-TDFC no later than 20 May 2026 (the 5 May legal date, extended by 15 calendar days).

Corporate tax balance (payment slip no. 2572): 15 May 2026#

The corporate income tax balance is due on 15 May 2026 (Article 1668, 2 of the CGI). Contrary to a common belief, it does not coincide with the return filing: the balance payment precedes it by five days.

Corporate tax instalments (form no. 2571): 15 March, 15 June, 15 September, 15 December#

The four 2026 corporate tax instalments are paid on 15 March, 15 June, 15 September and 15 December 2026 (form no. 2571, Article 1668 of the CGI). :::

Not all companies file form 2065. Depending on your legal structure and tax regime, 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 (determination 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 regime file:

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

These declarations 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 second 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#

This additional 15-calendar-day period stems from an administrative tolerance published in the BOFiP (BOI-BIC-DECLA-30-10-10-20, § 60), enforceable against the tax authority under Article L. 80 A of the LPF, and not from an article of the Tax Code. It applies to users of the EDI-TDFC or EFI electronic procedures, which is the case in virtually all situations where a chartered accountant is involved. The underlying legal deadline itself derives from Article 223, 1 of the CGI for companies subject to corporate income tax: filing within three months of the year-end, and no later than the second business day after 1 May where the year ends on 31 December.

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.

Here is the verified 2026 calendar, month-end by month-end (postponed to the next business day when the deadline falls on a weekend or public holiday):

Calculation rule: the last day of the 3rd month after year-end for paper filing, plus 15 calendar days for EDI-TDFC. A 31 December year-end escapes this three-month rule: the return is then due no later than the second business day after 1 May (Article 223, 1 of the CGI), i.e. 5 May 2026.

What about earlier years, the 2025 tax return and before?#

The calculation method does not change from one campaign to the next, only the dates shift with the calendar. For a year ending 31 December 2024, 1 May 2025 fell on a Thursday: the first business day after it was Friday 2 May and the second was Monday 5 May 2025, hence an electronic filing deadline of 20 May 2025. A 2025 tax return still not filed remains due: filing voluntarily, as long as no formal notice has been received, keeps the surcharge at 10% instead of 40% (Article 1728 of the CGI).

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, for late or missing filing without a formal notice (Article 1728, 1-a of the CGI);
• in the absence of tax due, a flat fine of €150 per document not filed on time (Article 1729 B of the CGI);
• in case of total absence of declaration 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.

Representative example (illustrative): a year ending mid-year. A company subject to corporate tax closes on 30 June 2025. Its tax return is due within three months, i.e. 30 September 2025, postponed to 15 October 2025 for EDI-TDFC filing. Filed two months late, without a formal notice, it bears late interest of 0.20% per month (Article 1727 of the CGI) and the 10% surcharge (Article 1728). An often-overlooked point: a good-faith director who regularises voluntarily may request, in writing, a discretionary waiver of the penalties from their business tax office under Article L. 247 of the LPF. The administration assesses each case individually, with no automatic relief.

Summary of the applicable penalties, legal basis by legal basis:

The Article 1728 surcharges apply to the tax due; the Article 1729 B fine takes over where no tax is payable. They are cumulative with late interest, which runs from the first day of the month following the deadline.

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 element 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-declaration 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 declaration, BOFiP - Filing deadlines (BOI-BIC-DECLA-30-10-10-20 §60))