How to Request a Dutch Tax Filing Extension (Uitstel) as an Expat

This is how uitstel actually works: who can request it, until when, how long it buys you, what it costs in interest, and which route to take if the deadline has already gone past.

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💡 Related: Netherlands tax deadline 2027 expat checklist, how to file Dutch taxes as an expat.

The three routes, in order of how much time they buy

Route one: request it yourself, online. Log in to Mijn Belastingdienst with your DigiD and choose the option to request an extension. This is the standard route and it costs nothing. You can only request uitstel if you received a letter from the Belastingdienst asking you to file (aangiftebrief), and if you file together with a fiscal partner, your partner has to request uitstel separately. For the 2025 return the Belastingdienst’s published instruction was to request before 1 May 2026, with the extension running to 1 September 2026; check the dates for later years on the same page.

Route two: request it by phone or on paper. The Belastingdienst also takes requests on 0800-0543 and by post using its downloadable form. This matters more than it sounds for expats, because not everyone has a working DigiD at the moment they need one — if you have moved recently, deregistered, or never activated a login, the phone route is the one that works.

Route three: go through a registered tax adviser. This is the beconregeling, a different mechanism rather than a longer version of the same one. The adviser registers you under their becon number and files on a schedule agreed with the Belastingdienst; the extension can run until 30 April of the following year. The catch is that the adviser has to enrol you in time: once the Belastingdienst has sent you a formal demand (aanmaning), an adviser can no longer bring your return under the becon arrangement, so involve one well before the deadline.

For what advisers charge and what an expat specialist adds beyond form-filling, see the best tax advisors for expats guide and, if you hold the expat ruling, choosing a tax adviser for the 30% ruling.

What uitstel does not do

An extension moves the date on which your return must arrive. It does not move the date from which the Belastingdienst reckons that you owed money.

The Belastingdienst’s own wording is clear: if you get an extension, you usually pay belastingrente. The interest percentage is set by the government and changes, so we will not quote a figure that ages badly — look it up at the moment you decide, because that calculation determines whether waiting is cheap or expensive for you.

So: if you expect a refund, the interest question is mostly irrelevant and the extension costs you nothing but the delay in getting your own money back. If you expect to owe, an extension can be the expensive option, and the alternative is getting money to the Belastingdienst earlier through a provisional assessment — see voorlopige aanslag explained. That second scenario can apply if you have freelance income on the side, a foreign rental property, or a year in which the ruling started or ended.

Why expats need the extension more often

The Dutch return is not the hard part. The hard part is that the Dutch tax year runs on Dutch paperwork timing while half of your documents come from somewhere else.

Migration-year returns. In the year you arrive or leave, you file a return covering a part-year as a resident and a part-year as a non-resident, usually on an M-form. It is longer and fiddlier, and the date that applies to you is the one printed on your invitation letter rather than the standard date you read about online. Read the letter.

Foreign annual statements. Brokers, banks and pension administrators outside the Netherlands work to their own calendars, and annual statements from abroad can arrive after the Dutch filing window has opened. If your box 3 assets sit abroad, this is a typical reason to need more time.

Payroll corrections. If your employer issues a revised jaaropgaaf, the number you need is not final until they say so.

None of these are unusual, and none of them are a reason to file a guess. A wrong return you have to correct later costs more time than an extension.

If the deadline has already passed

October is late in the cycle. For the 2025 return the Belastingdienst now says it plainly: you could request uitstel until 1 May 2026, you can no longer do so, and if you have not filed you must do it as soon as possible to avoid a fine (Belastingdienst, checked 24 September 2026). The same applies if you had an extension to 1 September and missed it. What remains:

1. File now, voluntarily. An unprompted late return is a far better position than one filed after an aanmaning. The escalation runs reminder, then formal demand, then a verzuimboete and potentially an estimated assessment imposed on you.
2. Call them. The Belastingdienst’s phone line (0800-0543) is the right place to establish which return, year and deadline actually apply to you. Have your BSN ready.
3. Check whether you were even obliged to file. Not every expat gets a filing obligation every year. With no invitation letter, filing may be optional but advantageous — and if you are due a refund, you can generally still file for earlier years.
4. Talk to an adviser about next year’s becon registration.

If an estimated assessment (ambtshalve aanslag) has already been imposed, do not ignore it because the number looks wrong: object within the period stated on it and file the real return.

Getting ahead of it for next year

In January, list the documents you need and who has to send them: jaaropgaaf, foreign statements, mortgage annual overview, broker overviews, allowance decisions. In February, check what the Belastingdienst has pre-filled — it pre-fills Dutch data such as salary and mortgage, while foreign income and assets you usually have to enter yourself, which is exactly where expat returns differ; our checklist for the coming filing season walks through it in order. In March, either file or request the extension — not in late April, when the same thought occurs to everyone. For the 2026 return the Belastingdienst will publish the dates; for the 2025 return filing opened on 1 March and the deadline was 1 May. Check the exact dates for that year on the Belastingdienst’s uitstel page rather than relying on this article.

If your net pay never matches what you expected, the salary after tax calculator shows whether the gap is a payroll or a tax-position issue, and the gross to net explainer covers the components.

My final thoughts

Uitstel is straightforward, provided you request it in time. It is a short online request that buys four months, and the only real cost is interest if you end up owing.

What is worth pushing back on is using it as a default. If you need an extension every year because the documents are always late, the fix is not more time; it is either an adviser with a becon registration or a provisional assessment that keeps your position roughly correct as the year runs.

Verified against Belastingdienst guidance on 20 August 2026 and rechecked on 24 September 2026: uitstel aanvragen and the beconregeling for tax advisers.