Tax package deadline 2026: deadlines

Updated March 2026 - The deadline for submitting the 2026 tax package depends on your closing date, your tax regime and the transmission method chosen. In practice, companies today use teleprocedures, which changes the truly operational date to remember. To avoid a delay, rejection or penalty, it is necessary to distinguish between the theoretical rule and the practical date of teletransmission.

For companies that closed their financial year on December 31, 2025, the reference date appears in the tax calendar for professionals.

Closing date December 31, 2025

• ▸May 5, 2026: principle deadline for the declaration of results;
• ▸May 20, 2026: practical deadline with the additional period of 15 calendar days granted to users of teleprocedures.

As remote transmission is the norm for professionals, May 20, 2026 is generally the target date for a company closing on December 31.

Closing on another date

The rule remains as follows:

• ▸deposit within 3 months of closing;
• ▸with, when the teleprocedure applies, the additional period of 15 calendar days.

Useful example: for a financial year ending March 31, 2026, the basic deadline falls on June 30, 2026 and the practical teletransmission date is in principle 15 days later.

In the event of cessation of activity

The logic changes. The declaration of results must then be produced within a specific, shorter deadline, which must be anticipated very early with your firm.

The keyword "tax package" actually covers several obligations.

Most frequent forms

• ▸2065 for companies subject to IS;
• ▸2031 for certain companies falling under the BIC;
• ▸2035 for BNCs;
• ▸2072 for SCI at IR.

Each package involves its own annexes, tables and controls. This is why a simple date reminder is not enough. You must also check the consistency of the file with your tax deadlines 2026, your VAT 2026 for SMEs and, if necessary, your outsourced repository organization.

Wait for final closing to begin

Companies that close at the last minute often have:

• ▸balance not revised;
• ▸missing supporting documents;
• ▸unpaid fixed assets;
• ▸VAT not reconciled;
• ▸remuneration arbitrations not finalized.

Confusing preparation date and sending date

It is necessary to plan:

• ▸accounting review time;
• ▸the validation time by the manager;
• ▸teletransmission time;
• ▸correction time in the event of technical rejection.

Forget the annexes

The risk is not just the delay. A package sent without consistent documents, without complete tables or with a poorly documented tax result exposes you to subsequent requests and corrections.

Hayot Expertise advice: set an internal closing date at least 10 to 15 days before the official deadline. You thus retain a real margin to correct the last deviations.

Build a retroplan

Your retroplan must include:

• ▸the accounting statement;
• ▸the tax review;
• ▸validation of the package;
• ▸anticipation of IS installments;
• ▸archiving of supporting documents.

Centralize data

A single document space avoids the last-minute hunt for invoices, loan contracts, bank statements, inventory entries and proof of provisions.

The deadline is only valid if your file is ready, coherent and teletransmittable. A check before sending avoids delays and unnecessary corrections.

👉 Discover our tax and closing support

Remote procedures and proof of sending

Systematically keep:

• ▸the acknowledgment of deposit;
• ▸details of the EDI;
• ▸the validated version of the package;
• ▸the documents which justify the restatements.

Alignment with other declarations

Your package must be consistent with:

• ▸your VAT declarations;
• ▸your payroll entries;
• ▸your annual accounts;
• ▸your possible tax options.

In 2026, the correct answer to the question "what is the deadline for filing the tax return?" is rarely a single isolated day. For a closing date of December 31, 2025, May 20, 2026 is the practical date to remember in the teleprocedure. For other closings, it is necessary to think about 3 months after the closing, then integrate the additional period applicable to teleprocedures. The most important thing is to anticipate.

📞 Need to confirm your exact deadline and secure shipping? Our firm can verify your calendar, your plan and your file before filing. Make an appointment with an expert

(Official sources: impots.gouv.fr - Professional tax calendar May 2026, impots.gouv.fr - Professional tax calendar June 2026, impots.gouv.fr - professional results formalities, Légifrance - CGI and reporting obligations of companies)