From April 9, you will be able to access the tax website's online service to file your income tax return of 2025. You must make this declaration even if you have perceived low resources (or no resources).

You can already use the official tax calculation simulator 2026 on 2025 income, to obtain an indication of the amount of your tax and your reference tax income. This simulator takes into account new income brackets, which each correspond to a different tax rate.

The simulator can only be used if you live in France.

You can use:

• the simplified simulator model, if you only have to declare salaries or pensions, for example, and you deduct the most common expenses (child support, childcare expenses, donations to associations and organizations of general interest, etc.);
• the full simulator model, if you also have to declare income from commercial, professional or agricultural activities, investments in overseas departments and regions, overall deficits, etc.