Disclaimer. The English translations provided herein are generated by artificial intelligence from Dutch and French content. While every effort has been made to ensure accuracy, we cannot guarantee that the translations will be error-free. The translated content is for readability purposes only and should not be considered as legal advice. For accurate information, employers and HR professionals are advised to consult the original versions in Dutch or French, or to consult your Securex Legal Advisor.
Tax-on-web and Tax-on-web Mandatary
In the digital age, the majority of citizens choose to access and fill in their tax returns digitally through Tax-on-web.
Those who still opt for a paper declaration, however, will soon receive it.
Are you a mandatary, such as a bookkeeper or accountant? If so, you can submit your clients' returns via Tax-on-web Mandatary.
What are the filing deadlines?
Since 2023, the filing deadlines for personal income tax have changed substantially.
For example, the difference between the filing deadlines for citizens and mandate holders disappeared and was replaced by a new distinction between ‘simple’ and ‘complex’ returns.
Filing deadlines for a simple return
The new filing deadlines for a simple declaration are:
- Paper return: 30 June 2025
- Electronic declaration: 15 July 2025
Inserting terms for a complex return
A complex return is a return involving profits or gains, remuneration to company directors, remuneration to assisting spouses or foreign professional income.
The new filing deadlines for a complex return are:
- Paper return: 30 June 2025
- Electronic declaration: 16 October 2025
Discover what is changing in your tax return this year
The model personal income tax return form for the assessment year 2025 (income 2024) already appeared in the Belgian Official Gazette in March. We have summarised the most important changes compared to last year for you.
Read more about the novelties in our news release
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