Biztax is now available

Biztax is now open for the assessment year 2026. You may submit your declaration for corporate tax, the tax on legal entities, or the tax for non-residents/companies. Those who submit their declaration by 28 August 2026 at the latest can anticipate certain advantages.

This AI-generated translation may contain errors and should not be considerd legal advice. For accurate info, refer to the Dutch or French version or consult your Securex Legal Advisor.

When must you submit your declaration?

In general, you have until the last day of the seventh month following the end of the financial year to submit your declaration.

If the deadline for submission falls on a Saturday, Sunday, or public holiday, an extension is granted until the next working day.

For declarations with balance dates from 31 December 2025 to 28 February 2026, the deadline for submission has been set at 30 September 2026.

The models of the declaration forms for corporate tax and legal entities tax, as well as for the tax on non-residents/companies for the assessment year 2026 (income 2025), were published in the Moniteur belge.

Receive your refund faster

Individuals who submit their declaration by 28 August 2026 can also expect a benefit. These declarations will be processed preferentially, allowing for a faster refund, which will be issued by the end of December 2026 at the latest (unless exceptions apply).