2026 tax declaration: what you need to know at the end of March
2026 tax return: what is already official as of March 29, 2026, what is not yet and how to prepare your file without delay.
Expert note: This article was written by our chartered accountancy firm. Information is current as of 2026. For a personalised review of your situation, contact us.
2026 tax declaration: what you need to know at the end of March
Update of March 29, 2026 - On this date, the official pages of Service-Public.fr and impots.gouv.fr indicate that the 2026 declaration of 2025 income will begin in April 2026. On the other hand, the final closing dates by department were not yet all publicly specified in the pages consulted at the time of our verification. We must therefore be rigorous: distinguish what is confirmed from what remains to be announced.
What is already official
As of March 29, 2026, two elements are clear:
- ▸the 2026 campaign will focus on 2025 income;
- ▸the opening will take place in April 2026.
What should not yet be affirmed without a fresh source
It is too early, at the end of March, to release a detailed schedule by department as if it were already final if the official update is not yet online. This caution is helpful and protects against miscommunication.
How to prepare your declaration before opening
You can already collect:
- ▸your activity income;
- ▸your IFU and movable income;
- ▸your rents and charges;
- ▸your proof of donations, home employment, childcare or work;
- ▸your possible heritage elements.
Points that justify a specialized review
- ▸rental income;
- ▸dividends;
- ▸capital gains;
- ▸international situation;
- ▸property arbitrations.
To complete, see Hello Taxes 2026, our guide to tax optimization for individuals and our article Tax advisor for individuals.
Hayot Expertise Advice: The best preparation for a tax return is to resolve technical matters before the platform opens, not during the last week.
Our support
We reread sensitive situations before filing and identify the points to arbitrate or document.
👉 Prepare your 2026 declaration with an expert
Conclusion
As of March 29, 2026, the correct information is to say what is official: the campaign starts in April 2026. The correct method is to prepare your documents now to avoid errors and haste.
📞 Do you want to secure your declaration before full opening? We can reread your situation and prepare the necessary arbitrations. Make an appointment with Hayot Expertise
(Official sources: Service-Public.fr - tax return deadline, impots.gouv.fr - tax return submission deadline)
Article written by Samuel HAYOT
Chartered Accountant, registered with the Institute of Chartered Accountants.
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