Objecting to a Dutch income tax assessment
Does your income tax assessment look wrong? Compare it with your return and supporting records, and identify the amount or item that differs. This guide concerns income tax; benefits and local taxes have their own decision instructions.
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1. Check the assessment and deadline
Object to a final assessment within six weeks of its date. A provisional income tax assessment is changed through an amendment. Compare the assessment and return: same tax year, income and deductions? Mark the difference and write down the result you believe is correct. Keep the original records.
2. Explain precisely what is wrong
Use the official form or a signed letter with your details, assessment number and reasons. Attach clearly organised evidence. For example, identify a missing deduction and the supporting document instead of simply saying the amount is wrong. Keep your submission. The Belastingdienst states that acknowledgement follows within three weeks; check receipt if it does not arrive.
3. Track payment separately
Payment of the disputed part is deferred during the objection; pay the rest on time. Collection interest may still apply. Record the payment deadline too. If your objection is late, investigate whether a reduction request is possible. This does not automatically restore the expired objection period. For a complex dispute, seek targeted help from a tax adviser or tax lawyer.
Documents to prepare
- Assessment, date and tax year
- Return and evidence for the disputed item
- Your calculation of the difference
- Objection copy, receipt and payment deadline
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Belastingdienst · Bezwaar maken ↗Belastingdienst · Voorlopige aanslag wijzigen ↗Belastingdienst · Reactie op bezwaar ↗Belastingdienst · Betaling tijdens bezwaar ↗Belastingdienst · Te laat voor bezwaar ↗Het Juridisch Loket ↗Sources may be in Dutch. General information about Dutch law, not individual legal advice. Updated 11 September 2026.