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The Belgian tax platform Tax-on-web Mandataire is now open for the 2025 tax year, allowing agents and professionals to begin submitting personal income tax declarations on behalf of their clients.
Key Deadlines for Tax Filing
You can access your client list directly within Tax-on-web Mandataire. This downloadable list includes the official submission deadline for each client.
If a general deadline of 15 July 2025 is shown, note that some clients may be eligible for an extended deadline up to 16 October 2025.
To benefit from this:
- If filing individually, you can indicate this at the final submission step by checking the appropriate box and attaching any necessary supporting documents.
- If filing multiple returns via Tax Files, you can make this indication directly within your accounting software.
No additional action is required; the system will automatically grant the extended deadline if the conditions are met.
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