2025 income tax return: what is the deadline in your department?

You can file your 2026 2025 income tax return on April 9. If you reported your income online last year, you did not receive a paper return. The tax administration generalizes the dematerialized approach. Online or in paper form, the tax return is already pre-filled with the information known to the administration.

You must declare your income if you are in one of the following situations:

• you reside and have a main professional activity in France;
• you reside abroad but your income comes from a French source;
• you turned 18 last year and you are not attached to your parents' tax household.

The 2026 calendar

The service of online declaration will be open until the following deadlines, different according to the departments:

• the thursday, 21 may at the latest (23:59) for departments 01 to 19 and for persons who do not reside in France;
• the thursday, 28 may no later than 11.59pm for departments 20 to 54;
• the thursday, 4 june at the latest (23:59) for departments 55 to 974 and department 976.

For the territorial collectivity of Saint-Pierre-et-Miquelon (975), the deadline for online declaration is Thursday 30 April (paper declaration closed since 31 March).

The paper declaration will have to be filed tuesday, may 19 by midnight at the latest, including for French residents abroad.

How to declare your income?

Online declaration

If you already have a tax number, an online access number and a reference tax income, you must declare your income online on the site impots.gouv.fr as follows:

• log in to your “Public Finance” area at the top of the home page of the site and fill in your tax number and password;
• select the “Declare” section;
• check the pre-filled information and if necessary, correct and complete your declaration.

Once the return is complete, you will be able to find out the withholding tax rate that will apply to your income starting in September 2026. After signing it, you can still change it if you wish until the deadline for declaration.

During the summer, you will receive your 2026 tax notice based on your 2025 income tax return. If you notice an error, you can always make a correction directly online from your Public Finance area.

Automatic declaration

The automatic declaration validates the tax return by a simple verification of the elements held and completed by the tax administration. If you reported your income online in 2025 and chose to no longer receive the paper return, you are eligible under 2 conditions:

• you are taxed only on 2025 income pre-filled by the tax authority;
• and your information has not changed in 2025 (address, family situation, amount of income and expenses, expenses eligible for reduction or tax credit, etc.).

If you are eligible, you will receive directly in your Public Finance area your return containing all the information known to the tax administration regarding your income and expenses (an email announcing the availability of the document is sent to you).

The automatic return shows the amount of income tax calculated on the basis of these elements and the resulting withholding tax rate that will apply from September 2026:

• if the information is correct and complete: you don't have to do anything. Your return will be automatically validated and your 2026 tax notice will be available from this summer in your Public Finance area;
• if the pre-filled information needs to be amended or supplemented: you must file a new return. To do this, from the automatic declaration, click on the button “Declare online”.