Tax package submission deadline 2026: guide

Updated March 2026 - The correct date for submitting a tax return always depends on two elements: the nature of the declaration and the closing date of the financial year. In 2026, the official tax calendar of the DGFiP already makes it possible to secure several important deadlines, starting with companies closing on December 31, 2025.

The professional tax calendar published by impots.gouv.fr shows, for companies closing on December 31, 2025, a deadline of May 5, 2026 for the main results declarations, with the additional period of 15 calendar days granted to users of teleprocedures.

In practice, for EDI-TDFC filings, this leads to a reference date of May 20, 2026.

This practical date concerns in particular:

• ▸2065 for IS companies;
• ▸2072 for SCIs not subject to IS;
• ▸the main results declarations relating to the classic annual calendar.

The 2026 calendar also shows that deadlines move depending on the closing date.

Official example: for a company whose financial year ends on February 28, 2026, the DGFiP shows a deadline of May 29, 2026 for declaration of results no. 2065 and its annexes, always with the additional time reserved for teleprocedures.

The tax package is not the IS balance. In May 2026, several dates can coexist:

• ▸deposit of the bundle;
• ▸electronic payment of the IS balance;
• ▸VAT deposits or obligations depending on the regime.

To keep an overview, complete with our article on Taxation and declarations: VAT, IS, advance payments, our guide on the VAT declaration and our pillar page Taxation 2026.

Hayot Expertise Advice: The real mistake is not only filing late. It is to submit a package on time with inconsistent annexes, an unreliable FEC or undocumented tax arbitrations.

We recommend preparing in advance:

• ▸review of accounts;
• ▸the justification of sensitive positions;
• ▸control of fixed assets and depreciation;
• ▸arbitration on provisions;
• ▸consistency between bundle, VAT and IS balance.

We secure the production of the tax package, the calendar, the annexes and the points of vigilance before teletransmission.

👉 Entrust your tax package to Hayot Expertise

In 2026, the deadline is only part of the story. The real challenge is to submit a fair, documented and consistent package with the rest of your tax obligations.

📞 Do you want to make your 2026 deposit more reliable before maturity? Our office can review your calendar and annexes before teletransmission. Make an appointment with Hayot Expertise

(Official sources: impots.gouv.fr - professional tax calendar 2026, impots.gouv.fr - professional reporting obligations)