What is a Dutch tax return extension?
A Dutch tax return extension is extra time to file. You ask the Belastingdienst for it yourself¹.
Three different dates sit behind the word extension. Without an extension you file before 1 May of the year after the tax year¹. Ask before that date and you have until 1 September instead¹. A tax advisor can go further, to 30 April of the second year after the tax year³.
We cover filing itself on how a Dutch tax return works. Changing a return you have already filed runs through correcting a Dutch tax return.
An extension moves the filing date. It does not move the moment you pay. And it does not switch off belastingrente, the interest the Belastingdienst charges on tax you still owe².
Take Nadia. She has filed here once before. Her aangiftebrief, the letter inviting her to file, arrives in April. One statement from her previous country will not reach her before the summer.
So how does she actually ask for it?
In short
1 May: the standard filing deadline for your income tax return, in the year after the tax year¹.
1 September: your new deadline if you ask for an extension before 1 May¹.
30 April: how far a tax advisor can move your deadline, into the second year after the tax year³.
Belastingrente: with an extension the interest clock starts on 1 July². A provisional assessment can keep the amount it is based on small.
Ask separately: your fiscal partner submits their own request¹. You can do it for them with a written authorisation.
How do you request a Dutch tax return extension?
You request it online in Mijn Belastingdienst, before 1 May¹.
One condition comes first. You can only ask for an extension if the Belastingdienst has sent you an aangiftebrief¹. No letter means no extension¹.
With the letter in hand, log in to Mijn Belastingdienst with DigiD, the Dutch digital ID. Then choose the option for asking for more time with your income tax return¹. Cannot use Mijn Belastingdienst? Then call 0800-0543 with your bsn (citizen service number) to hand¹. Or download the form Aanvraag uitstel aangifte inkomstenbelasting, fill it in and post it¹.
The Belastingdienst then sends a confirmation letter within three weeks¹.
Filing together does not mean asking together. Your fiscal partner submits their own request¹. You can also submit it for them if you hold a machtiging, a written authorisation¹.
Living abroad and paying tax here does not change the dates. Non-residents, who file their return on form C, ask before 1 May in the same way¹.
Nadia has her aangiftebrief, so the online route is open to her. She asks in April, well before the deadline.
Three different deadlines are now in play.
| Route | Who arranges it | Your filing deadline |
|---|---|---|
| No extension | nobody, this is the default | 1 May of the year after the tax year |
| Extension you request | you, before 1 May | 1 September of that same year |
| Advisor scheme (becon-uitstel) | your tax advisor, under a set schedule | 30 April of the second year after the tax year |
What does a Dutch tax return extension cost you?
With an extension the Belastingdienst counts belastingrente from 1 July².
Belastingrente always counts from 1 July², whenever your return arrives. File before 1 May and the Belastingdienst accepts your return unchanged? Then you pay none². The Belastingdienst sets the percentage per calendar year⁴.
The clock does not run forever. It stops at most nineteen weeks after your return comes in². If your assessment arrives sooner, it stops six weeks after the date on that assessment². The Belastingdienst calculates using months of 30 days and years of 360 days². It rounds the result down to whole euros².
Filing late without an extension is a different matter. You first get a reminder, then an aanmaning, which is a formal demand⁵. Miss the date on the aanmaning and a verzuimboete, the penalty for filing late, can follow⁵. The Belastingdienst does not impose one if the delay was not your fault in any way⁵.
What that costs in practice depends on the percentages and amounts in the table below.
| What | How much | When it applies |
|---|---|---|
| Belastingrente with an extension | 5% | from 1 July, up to 19 weeks after your return comes in |
| Verzuimboete for filing late | €469 | you file after the date on the aanmaning |
| Verzuimboete when it happens again | up to €6,709 | you filed late in an earlier year as well |
| Betaalverzuimboete (penalty for paying late) | 5% of the amount due, at least €50 and at most €6,709 | you pay your assessment late |
What does an extension look like in practice?
Your filing date moves, but the interest still counts from 1 July².
Nadia files in June, well inside her new deadline. Her return shows €1,000 still to pay. Belastingrente starts on 1 July². In her case it runs for about ten weeks². Her assessment arrives in late July, so the clock stops six weeks after that date².
Ten weeks counts as 70 days. With the 5% from the table above, that is 70/360 × 5% × €1,000 = €9.72. The Belastingdienst rounds down to whole euros, so Nadia pays €9². This is an indication, not a final calculation.
The percentage is the same whatever you owe. Only the amount changes. So the way to keep the interest small is to owe less by 1 July.
You can ask the Belastingdienst for a voorlopige aanslag, a provisional assessment you pay during the year. We explain how that works on the provisional assessment.
Nadia does exactly that the following year. Same extension, less interest.
What if an advisor takes the filing off your hands?
“Most people who call in April think they have left it too late. Interest only counts from 1 July, whenever they file. So we first look at what they still owe.”
How does an extension through a tax advisor work?
A tax advisor can move your deadline much further, to 30 April³.
That is 30 April of the second year after the tax year³. The scheme has a Dutch name, becon-uitstel³. Tax service providers file for many clients at once, so the Belastingdienst spreads their returns across the year³.
It is not a form you submit. The advisor holds a beconnummer and a certificate³. A beconnummer is the advisor's own registration number with the Belastingdienst. They work to a schedule the Belastingdienst sets³. Missing that schedule can cost the extension³.
We hold a beconnummer, so we can file your return under this scheme³.
There is a trade-off worth naming. A year of extra room is a year of belastingrente on anything you still owe². The voorlopige aanslag above is the counter-move. It works the same way here.
Which route fits you depends on your own dates and figures.
What does this mean for your own tax return?
Start with the date on your aangiftebrief, then with what you expect to owe¹.
A letter in hand and one missing document is the classic case for asking before 1 May. Nadia is exactly that case, so her April request was the right move.
Expecting a refund changes the weight of the decision. Belastingrente applies to tax you owe, so a refund year makes the extra time cheap². Expecting to pay pushes the voorlopige aanslag up your list.
Statements that arrive after 1 September every year point at the advisor scheme rather than at one more September deadline³.
We do this every filing season. You tell us your situation once and we take in the whole of it: the return, the deadline and anything that touches either.
Would you rather hand the filing over? Look at our tax return service. Want the wider context first? Read about the Dutch tax system or about help with your tax return. Already filed and something is off? Then read on about correcting a Dutch tax return.
¹ belastingdienst.nl, Uitstel aanvragen voor de belastingaangifte 2025 - hoe doe ik dat? · Accessed
² belastingdienst.nl, Belastingrente betalen bij inkomstenbelasting · Accessed
³ belastingdienst.nl, Uitstel aanvragen voor fiscaal dienstverleners (becon-uitstel) · Accessed
⁴ belastingdienst.nl, Overzicht percentages belastingrente · Accessed
⁵ belastingdienst.nl, Boete · Accessed
Common questions about extending your Dutch tax return deadline
Do I get an extension automatically?
No, you ask for it yourself, before 1 May¹. You do that in Mijn Belastingdienst, by phone on 0800-0543 or with the paper form¹. The Belastingdienst confirms it in writing within three weeks¹.
What if I never received an aangiftebrief?
Without that letter you cannot ask for an extension¹. The Belastingdienst only opens the request to people it has invited to file¹. Call them if you think a letter should have reached you. Filing for the first year after arriving? The same rule applies, ask once your letter is in.
Does my fiscal partner get the extension too?
No, your partner submits a separate request¹. You can do it for them if you hold a machtiging, a written authorisation¹.
Does an extension also give me more time to pay?
No, it moves the filing date only². Belastingrente still runs from 1 July on anything you owe². Paying a voorlopige aanslag during the year keeps that amount small.
I missed 1 May. What happens now?
File as soon as you can, because a fine can follow a late return⁵. Belastingrente counts from 1 July on anything you still owe². The Belastingdienst first sends a reminder, then an aanmaning⁵. A verzuimboete can follow once that date passes⁵.
Can I still file before 1 September?
Yes. Filing earlier shortens the period the interest can run over². That 1 September date only applies if you asked for an extension before 1 May¹. An extension sets a ceiling, not an instruction. The clock stops at most nineteen weeks after your return comes in².