How do I change my provisional income tax assessment?
What would you like help with?
Detailed explanation, checklist and sources
Update an estimate that no longer fits your situation through Mijn Belastingdienst. Check the whole year and all the information. Whether you can still make a change depends on your filing deadline and whether you have already filed a return for that year.
On this page
- Check the type of assessment
- Estimate the whole year's figures
- Make the change in Mijn Belastingdienst
- Check the deadline
- Check the response and other schemes
- Keep the basis for your estimate
- No provisional assessment? Prepare your first application
- Will my benefits be updated at the same time?
- Documents to prepare
- Sources
1. Check the type of assessment
This guidance concerns a Dutch provisional income tax assessment. A provisional assessment is based on an estimate. A new job, changed income, a move or different deductions may make an update sensible. The Belastingdienst states that making this change is not compulsory. You do not lodge an ordinary objection against this provisional assessment itself; a final assessment or a decision rejecting requested changes requires a different route.
2. Estimate the whole year's figures
Gather current annual figures rather than relying only on your latest monthly salary. Record what you expect to receive or deduct over the entire tax year and why. Also check information that has stayed the same. A higher or lower provisional amount is not a final calculation of your eventual tax liability.
3. Make the change in Mijn Belastingdienst
Log in directly to Mijn Belastingdienst and choose the correct year and the option to change the provisional assessment. Complete all sections, check the result and sign. For a joint request, each tax partner signs using their own DigiD. You must submit the request and receive confirmation; saving it alone does not complete the application.
4. Check the deadline
If you have already filed a return for that year, you can no longer change its provisional assessment. If you received a filing invitation, you can make the change until the filing deadline, including any extension granted. Without an invitation, the general deadline is 1 May after the tax year; after that, use the tax-return route.
5. Check the response and other schemes
The Belastingdienst states that a response usually takes four to five weeks, and no more than eight weeks. Check the document you receive and keep any payment instructions. Changing this assessment does not automatically change your benefits: use the separate toeslagen route. A changed provisional amount also does not automatically cancel earlier payment instalments. Did you change your provisional assessment for 2026 after 15 October 2026? The Belastingdienst does not automatically carry that change over to 2027. Also check your provisional assessment for 2027 and amend it separately if needed.
6. Keep the basis for your estimate
The checklist and timeline help you organise your estimate and correspondence. Do not enter DigiD, BSN or bank details here. Use the official portal for the request. If a change is rejected, a deadline has been missed or a final assessment differs, you can use our own assistance form to have the appropriate next step assessed.
7. No provisional assessment? Prepare your first application
A provisional income-tax assessment lets you pay tax or receive an expected refund during the year. It is an estimate, not a final award or benefit. An excessive refund may have to be repaid. Estimate all annual income, withholding, home, assets and supported deductions realistically. Use the official application in Mijn Belastingdienst for the correct year and residence situation; check reused old figures. Each partner signs a joint application with their own DigiD. Never share login details. First check whether you already filed that year’s return: you can no longer apply then. Otherwise the invitation deadline, including granted extension, applies; without an invitation, it is 1 May after that year. Keep the receipt and application PDF. The official instructions say a response usually arrives within four, at latest eight weeks. Read the assessment for payment or refund arrangements; do not invent payment instructions. Review your annual estimate and use this page’s amendment steps when circumstances change. The final return remains separate. This preparation submits no application.
Will my benefits be updated at the same time?
No. Changing a provisional income tax assessment does not update your information with Dienst Toeslagen. Check both schemes separately and keep the confirmations.
Documents to prepare
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Tax year and type of assessment received
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For each event, note the date, what happened and where the evidence is kept. Example: 3 October — letter received — correspondence folder.
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- Tax year and type of assessment received
- Current provisional assessment and latest amendment
- Expected annual income and relevant deductions
- Unchanged information checked again
- Return already submitted? Invitation date and any extension granted
- Submitted amendment, confirmation and new correspondence
Contact with a lawyer
You can use the chat and information without a phone number. A contact request requires a phone number, a verified email address and your wish for telephone contact. Our team assesses which partner fits your question. Data is shared only under the stated consent procedure. A partner or engagement is not guaranteed.
View the current application processSources
Need personal assistance? Request a lawyer through our chat. We explain the next step; submitting a request does not engage a lawyer. The links below support the legal information.
Belastingdienst · Voorlopige aanslag wijzigen ↗Belastingdienst · Uiterste wijzigingsdatum ↗Belastingdienst · Wanneer aanpassen verstandig is ↗BD eerste aanvraag ↗BD waarom ↗BD uiterste datum ↗Sources may be in Dutch. General information about Dutch law, not individual legal advice.