Tax declaration deadline: what do we know as of March 30, 2026?

Updated March 30, 2026 - The search for tax declaration deadline increases each year as the declaration campaign approaches. As of March 30, 2026, you must remain cautious: the details of the deadlines must be verified on the official media of the DGFiP and Service-Public.

To complete, also see Tax package submission deadline 2026, Mandatory tax declarations 2026 and Tax or social question.

• ▸check the effective opening of the online campaign;
• ▸check the dates according to your department;
• ▸follow DGFiP updates;
• ▸do not reuse an old calendar without control.

Conseil Hayot Expertise: in tax reporting, it is more useful to say that a date is not yet fully confirmed than to display a fragile date.

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As of March 30, 2026, the best approach is to check the tax declaration deadline directly on official channels before final validation of your calendar.

📞 Do you want to secure your declarations rather than chasing dates at the last moment? We can help you make your reporting organization more reliable. Make an appointment with an expert

(Official sources: Service-Public.fr and impots.gouv.fr, consulted as of March 30, 2026)