Can You Correct a Mistake or Omission on Your Income Tax Return?

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After receiving your tax assessment notice, you may realize that certain information was entered incorrectly or that some income, expenses, deductions, or tax credits were omitted from your return. Fortunately, the French tax administration allows taxpayers to correct their declarations under specific conditions.

If You Submitted Your Tax Return Online

Taxpayers who filed their return electronically can access the online correction service through their personal account on the French tax portal. This service enables users to update or complete information that may affect the calculation of their tax liability.

You can generally modify:

  • Information relating to dependents;
  • Declared income;
  • Deductible expenses and charges;
  • Tax reductions and tax credits;
  • Information concerning the Real Estate Wealth Tax (IFI);
  • Certain supporting declarations that can be added or removed.

However, some details cannot be changed through the online correction tool, including:

  • Civil status information;
  • Changes in family situation (marriage, PACS, divorce, separation, or death);
  • Tax residence details;
  • Certain administrative information linked to representatives or attached students.

When modifications concern these elements, taxpayers must either send an amended declaration to their local tax office along with supporting documents or submit a request through the secure messaging service available in their personal online account.

If no correction is made before the closure of the online correction period, taxpayers may still request a review of their tax assessment by filing a formal claim. Such claims can generally be submitted online through secure messaging or by post to the relevant tax office within the applicable legal deadline.

Once the request has been processed, the tax administration issues a revised tax notice reflecting the corrected information.

Important: The online correction service is intended for use on a computer and may not be available on smartphones or tablets.

If You Filed a Paper Tax Return

Taxpayers who submitted their declaration in paper format cannot use the online correction service. To amend their return, they must contact their tax office directly, either by:

  • Sending a written request explaining the correction;
  • Filing a new paper return that replaces the original declaration.

In the case of a replacement return, it is recommended to clearly indicate that the new declaration cancels and replaces the previous one. All information must be completed again, including items that were correct in the initial filing.

Even after receiving the tax notice, taxpayers generally retain the right to challenge or correct their tax assessment within the statutory claim period established by the French tax authorities.

Obtaining a New Tax Return Form

A blank income tax return form can be obtained by downloading it from the official tax administration website or by collecting a copy directly from a local public finance office. Contact details for tax offices are available through the administration’s online contact and appointment services.