2025 Tax Return: How to Make Corrections

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If you’ve made a mistake or forgotten to declare income on your 2025 tax return, don’t worry—corrections are still possible, whether you filed online or by paper. Here’s what you need to know, according to Service-Public.fr.

If You Filed Online

The online declaration portal remains accessible until the end of July 2025, giving you time to amend your return directly through your personal space on impots.gouv.fr. You can also make changes using the mobile app if you submitted your return that way.

⚠️ Important: Avoid filing a new return at this stage—this may result in late penalties. Use the correction option instead.

After Receiving Your Tax Notice

Your tax notice will be available by late July or early August in your online account. If you spot an error at this point, an online correction tool will be open from July 30 to December 3, 2025.

During this window, you can:

  • Adjust amounts

  • Modify selected checkboxes

Once submitted, you’ll receive an email confirmation. A revised tax notice will be issued, and your withholding tax rate will be updated accordingly.

After the Online Correction Period

Once the correction window closes on December 3, 2025, you’ll need to file a formal claim from your private account. Deadlines apply, so check the relevant guidance here: Tax claims and legal actions.

🛑 Note: Some details cannot be changed via the correction tool, including:

  • Changes in marital or civil status (marriage, PACS, separation, divorce, death)

  • Updates to your identity details

  • Modifications related to addresses or escrow designations

If You Filed a Paper Return

After receiving your notice, you may submit a correction request either online or by mail. Your written claim should include:

  • Full name and address

  • Tax identification number

  • Handwritten signature

  • Details of the tax in question

  • The reason for the correction, along with supporting documents

Good to Know: The “Right to Make Mistakes”

French tax law grants taxpayers a “right to make mistakes”—meaning if you unintentionally submitted incorrect information, you can correct it without incurring a penalty.