Tax and government mail
Definitieve aanslag
Final tax assessment
What does Definitieve aanslag mean?
A definitieve aanslag is the final income tax assessment for a year. The Belastingdienst issues it after checking your return, and it settles the difference with any provisional assessment you already paid or received. The Belastingdienst normally has until 3 years after the end of the tax year to issue it. If you disagree, you have 6 weeks from the date on the letter to file a bezwaar.
Key facts
| Issued within | 3 years after the end of the tax year (longer if you had a filing extension) |
| Objection deadline | 6 weeks from the date on the letter |
| Cost of objecting | Free |
| Later correction by the tax office | Possible through a navorderingsaanslag, up to 5 years |
What to do
- Compare it line by line with your return: income, deductions, box 3 assets and tax credits.
- Look for a line stating the Belastingdienst deviated from your return (afwijking). That is where corrections are explained.
- Check the result against your provisional assessment: extra to pay, or an extra refund.
- If something is wrong, file a bezwaar within 6 weeks. It is free and can be done online.
- Keep it for at least 5 years. You need it for mortgages, benefit checks and when you leave the country.
Worth knowing
If you find an error in your favour after the 6 weeks have passed, you can still ask the Belastingdienst to reduce the assessment ambtshalve (of its own motion). It is not a right, but it is accepted for clear mistakes within 5 years.
Frequently asked questions
How long does the Belastingdienst take to send the definitieve aanslag?
It varies from a few months to the legal limit of 3 years after the end of the tax year. Simple returns that match the pre-filled data are often settled quickly; returns with deductions or foreign income can take much longer.
What happens if I file a bezwaar?
The Belastingdienst reviews the assessment and sends a decision on your objection. If you still disagree, you can appeal to the court. Filing the objection does not automatically pause a payment, so ask for deferral (uitstel van betaling) in the same objection.
Can the Belastingdienst still change a final assessment?
Yes, within 5 years it can issue a navorderingsaanslag if it discovers new facts, such as undeclared foreign income or assets.
Read next
Official sources
More Dutch terms: tax and government mail
Plain-English explanations of the words on your letters and contracts.