What is a Box 3 final assessment?
A final assessment is the Belastingdienst's definitive calculation of your tax for a year.¹ It settles what you owe or get back.
The Dutch call it the definitieve aanslag. It usually follows a provisional assessment (voorlopige aanslag). Once the final assessment lands, the figures are set unless you object.
For Box 3, your savings and investments, this document matters. It shows the deemed return the Belastingdienst applied to your wealth and the tax on it. This is the fictief rendement, a fixed rate, not your actual return. That is where a first assessment often surprises people.
Take Tariq. He moved here a few years ago and built up savings and a small investment account. This is his first assessment with a Box 3 amount on it, and he wants to know whether the figure is right.
In short
The final assessment is definitive. It replaces any provisional assessment and sets what you owe or get back.
Up to three years to arrive. A 2025 assessment can still land as late as 31 December 2028.
Read the Box 3 part closely. The deemed return and the tax-free amount of that tax year drive the figure.
You have six weeks to object (bezwaar), counted from the date on the assessment.
Small amounts drop out. For 2026, below €58 the Belastingdienst imposes no assessment. Below €18 it pays no refund.
No return filed? The Belastingdienst estimates your income itself and adds a penalty.
When do you get your final assessment?
The Belastingdienst has up to three years to send your final assessment.¹ The clock starts on 1 January after the tax year.
So the Belastingdienst can finalise a 2025 return any time until 31 December 2028. Most people get theirs sooner, often within a year, but a complex or audited return can take longer.
A Box 3 assessment can also arrive in waves. Older years caught by the so-called rechtsherstel (the Box 3 legal-redress scheme) work differently. The Belastingdienst sends letters and assessments per tax year, on its own schedule. Is your issue really about reporting your actual return? Then there is a separate route. We cover it on our page about the Box 3 actual return (opgaaf werkelijk rendement).
Living abroad does not change the rule. The same three-year deadline applies, extended by any filing postponement the Belastingdienst granted you.
| Item | Figure or window | Note |
|---|---|---|
| Final assessment deadline | 3 years | e.g. a 2025 return, by 31 December 2028 |
| Objection window (bezwaar) | 6 weeks | from the date on the assessment |
| Assessment threshold (aanslaggrens) | €58 | below this, no assessment follows |
| Refund threshold (teruggaafgrens) | €18 | below this, no refund is paid |
| Amend your own return | up to 5 years | after the end of the tax year. Separate from the objection window. |
How do you review the Box 3 figures on your assessment?
Compare the assessment with your return and that tax year's Box 3 thresholds.¹ Three numbers do most of the work.
First, your tax-free amount. For the 2026 tax year the Belastingdienst leaves the first €59,357 of your wealth untaxed, or €118,714 with a fiscal partner. Only the amount above that counts. An assessment for an earlier year uses that year's own, lower amounts.
Second, the deemed return. Box 3 works with fixed percentages per type of asset. This is the so-called fictief rendement, not what you actually earned. The full rate table sits on our page about Box 3 assets and the calculation.
Third, your own actual return. If your real return was lower than the deemed one, you may be able to report it and pay less. Tariq reviews this before he accepts the figure.
What if you disagree with your assessment?
You can object within six weeks of the date on the assessment.¹ The Dutch call this a bezwaar.
Send it in writing to the Belastingdienst, stating which figure you dispute and why. Miss the six weeks and the assessment stands.
For Box 3 objections tied to the rechtsherstel, the Belastingdienst began working through them from 13 October 2025.² Your own case may still be in that queue.
You do not have to file a bezwaar alone. We review the whole return behind the assessment, not just the one figure. Then we object where it is justified.
You can still correct your return afterwards. That is a different request and it does not replace the objection window.
What if you did not file a return?
The Belastingdienst then estimates your income and sends an assessment itself.¹ This is an ambtshalve aanslag.
It works from the data it already holds, so a Box 3 estimate can run high. On top of it comes a penalty for filing late or not at all.
You can still put this right. You may amend your own return for up to five years after the tax year. A corrected return usually beats an estimate made without your figures.
What does this mean for you?
The next step is your own document.
Read the Box 3 part against your return and the thresholds of the tax year it covers. Note the date on the assessment, so the six-week window does not pass you by. And if your actual return came in lower, treat that as a question worth raising before you pay. Tariq closes his own review there, once the actual-return question is settled.
Common questions about the Box 3 final assessment
When will I get my Box 3 final assessment?
Often within a year, though the legal limit is three years. For a 2025 return that means any time up to 31 December 2028. Older rechtsherstel years follow their own schedule.
What can I do if I disagree with the assessment?
Send a written objection, a bezwaar, before the six-week deadline passes. Say which figure is wrong and why. We look at the whole return behind it, not just that one number.
Do I have to wait for a letter to report my actual Box 3 return?
Not for 2025. For 2025 you report your actual return inside your normal tax return. For older years, the Belastingdienst sends a separate letter per tax year. Our Box 3 actual return guide explains the route.
What is the difference between a provisional and a final assessment?
A provisional assessment is an estimate, a final assessment is definitive. You may pay or receive money on the provisional figure during the year. The final assessment settles the real amount and starts the six-week objection window.
¹ belastingdienst.nl, Definitieve aanslag inkomstenbelasting · Accessed
² belastingdienst.nl, Box 3 objection processing · Accessed
Not sure your Box 3 assessment is right?
We go through the whole return behind your assessment, not just one figure. Where it is justified, we object within the six weeks. You get a dedicated advisor and a clear price for your situation.
