Income tax - How to correct your return?

Verified 01 January 2026 - Public Service / Directorate of Legal and Administrative Information (Prime Minister)

Income tax: 2026 income tax return for 2025

This page is up to date at 1er January 2026.

However, forms, online services and information materials are not yet available for the 2026 tax year of the 2025 tax return. They will be put online as soon as they are available.

In addition, the draft budget law for 2026 could not be promulgated before 1er January 2026.

The law n°2025-1316 of 26 december 2025 The Special Authorizes the Government to Collect Taxes, Without Modifying the Scales, Until the Adoption of a Budget Law for 2026.

If the Finance Law for 2026 changes the rules presented on this page, the content will be updated after the publication of the Finance Law in the Official Journal.

In case of error or omission, you can correct your tax return. Terms and conditions vary depending on whether you file online or on a paper form.

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You reported your income online

The correction depends on the declaration concerned.

This is the 2026 return of income for 2025

The approach depends on the date of the correction.

Before the deadline for filing your return

From the opening of the online return (in April 2026), you will be able to modify your return from your particular space on the tax website (we talk about amending declaration).

You can do it as many times as you need.

Taxes: access to your space Private

You will be able to correct the amounts entered in the boxes, check or uncheck the incorrect boxes.

A confirmation email will be sent to you at the end of the procedure.

After the reporting deadline

The approach depends on the date of the correction.

Until the closure of the online reporting service

The online reporting service will be open.

You can correct your statement.

Taxes: access to your space Private

Warning  

If you file your return, not just a correction, after the online filing deadline, you risk a penalty for late declaration.

Between July and December 2026
General case

In the event of a finding of an error after receiving your tax notice, it will be possible to correct your return online, in your Personal area on the tax website.

Taxes: access to your space Private

You can also use this service if you have benefited from a automatic declaration.

Please note

If you have declared your income online on the mobile application "taxes.gouv", you can correct your declaration on smartphone or tablet.

You will be able to correct the amounts entered in the boxes, check or uncheck the incorrect boxes.

A confirmation email will be sent to you at the end of the procedure.

You will receive a new tax notice.

Then, your withholding tax rate will be updated.

Warning  

As with any statement, the administration may, if necessary, ask you for clarification, and possibly refuse the requested correction.

You will not be able to correct some errors through the online correction service.

This is the case in particular for the following:

  • Change in family status (marriage, Civil partnerships, divorce, death, etc.)
  • Updating the civil status
  • Change of address.

You will need to request these changes using your secure messaging from your Personal Space.

Self-employed

In the event of a finding of an error after receiving your tax notice, it will be possible to correct your return online, in your Personal area on the tax website.

Taxes: access to your space Private

As a self-employed person (tradesman, practitioner or medical assistant and liberal profession), you can correct your social and tax tax returns.

Changes will be made automatically transmitted to the Urssaf(and the liberal professions pension fund if you are a member).

The amount of your social contributions will be adjusted.

You will be able to correct the amounts entered in the boxes, check or uncheck the incorrect boxes.

A confirmation email will be sent to you at the end of the procedure.

You will receive a new tax notice.

Then, your withholding tax rate will be updated.

Warning  

As with any declaration, the administration may, if necessary, ask you for clarification and possibly refuse the requested correction.

You will not be able to correct some errors through the online correction service.

This is the case in particular for the following:

  • Change in family status (marriage, Civil partnerships, divorce, death, etc.)
  • Updating the civil status
  • Change of address.

You must request these changes using your secure messaging from your Personal Space.

From December 2026

After the end of the correction period of the online declaration, you will have to lodge a complaint from your private space.

Taxes: access to your space Private

Prepare a folder containing the following information:

  • Your name, address and handwritten signature
  • Name and characteristics of the tax concerned
  • Reasons for the claim
  • Supporting documents (as applicable, a copy of the tax assessment notice, a copy of the assessment notice, a document justifying the amount of the withholding tax or payment in the case of tax collected by withholding tax).
This is another tax return

If you have not made the correction in time, you can lodge a complaint.

You can do it until december 31, 2026 for the 2024 tax return.

You can file your claim online from your specific area.

Taxes: access to your space Private

Prepare a folder containing the following information:

  • Your name, address and handwritten signature
  • Name and characteristics of the tax concerned
  • Reasons for the claim
  • Supporting documents (as applicable, a copy of the tax assessment notice, a copy of the assessment notice, a document justifying the amount of the withholding tax or payment in the case of tax collected by withholding tax).

You reported your income on paper

This is the 2026 return of income for 2025
Before the deadline for the submission of the declaration

You can't use the online correction service.

You will have to file a new paper tax return at your personal income tax department.

You will need to specify the following:

  • Specify "AMENDING, CANCELING AND REPLACING DECLARATION" on the first page
  • Re-enter all items you need to declare, including the correct items in 1re declaration.

2025 Income Tax Return 2024 (paper)

After the deadline for the submission of the declaration

After receiving your tax notice, you can lodge a complaint.

Prepare a folder containing the following information:

  • Your name, address and handwritten signature
  • Name and characteristics of the tax concerned
  • Reasons for the claim
  • Supporting documents (as applicable, a copy of the tax assessment notice, a copy of the assessment notice, a document justifying the amount of the withholding tax or payment in the case of tax collected by withholding tax).

You can make your claim by one of the following means:

  • Online
  • By post
  • By phone
  • At the counter.

You will be able to make your claim online from your particular space:

Taxes: access to your space Private

Alternatively, you can contact your public finance center.

This is another tax return

If you have not made the correction in time, you can lodge a complaint.

You can do it until december 31, 2026 for the 2024 tax return.

Prepare a folder containing the following information:

  • Your name, address and handwritten signature
  • Name and characteristics of the tax concerned
  • Reasons for the claim
  • Supporting documents (as applicable, a copy of the tax assessment notice, a copy of the assessment notice, a document justifying the amount of the withholding tax or payment in the case of tax collected by withholding tax).

You can make your claim by one of the following means:

  • Online
  • By post
  • By phone
  • At the counter.

You will be able to make your claim online from your particular space:

Taxes: access to your space Private

Alternatively, you can contact your public finance center.

Who can help me?

Find who can answer your questions in your region

  • For general information

    Tax Information Service

    By phone:

    0809 401 401

    Monday to Friday from 8:30 am to 7 pm, excluding public holidays.

    Free service + price call

  • To contact the local service managing your file

    Tax department (treasury, tax department...)