Tax Return in the Netherlands: A 2026 Guide for Expats

Filing a tax return in the Netherlands feels daunting the first time, but the system is more automated than most newcomers expect, and getting it right often means money back rather than a bill. Here’s how the aangifte inkomstenbelasting works, when it’s due, and the one form that trips up almost every new arrival.

Do you even need to file?

You must file if the tax office (the Belastingdienst) sends you an invitation letter (the aangiftebrief) or if you have income from several sources, are self-employed, own a home here, or hold assets above the tax-free threshold. Even when you’re not obliged to, it’s often worth filing voluntarily, because deductions like mortgage interest, healthcare costs or study expenses can trigger a refund. If you freelance, this sits alongside the wider picture in our ZZP and self-employment guide.

The 2026 deadlines

For the 2025 tax year, the portal opens on 1 March 2026 and the standard deadline is 1 May 2026. If you can’t make that, you can request an extension to 1 September, and registered tax advisers can file later still under a separate arrangement. Refunds, when you’re owed one, typically land within three to six months of filing.

What you need before you start

Filing online is the standard route, and for that you need a DigiD – which in turn requires a BSN number and a registered Dutch address, so sort those early as DigiD activation can take weeks. Beyond the login, gather your annual salary statement (jaaropgave) from each employer, bank statements, any mortgage paperwork and receipts for deductible costs.

The pre-filled return makes life easier

From 1 March, the Belastingdienst offers a pre-filled return (vooraf ingevulde aangifte) at mijn.belastingdienst.nl. Log in with your DigiD and quite a chunk of your data like salary, bank details, and property value, is already populated. It’s usually accurate, but the legal responsibility to check it is yours, so review every section and add anything missing: freelance or foreign income, rental income, and deductions the system can’t see.

The M-form: your arrival (or departure) year

This is the big one for newcomers. If you moved to (or left) the Netherlands partway through the tax year, you don’t file the standard return; you file the M-form (M for migratie). You were resident for only part of the year, which changes the calculation, and the M-form exists to handle exactly that split. It can be done online through the portal, or on paper if you prefer, but be aware it’s more involved than the regular return – many people use a tax adviser for their first filing precisely because the arrival year is the fiddliest.

How the tax itself is structured

Dutch income tax runs on a three-box system: Box 1 covers income from work and your home, Box 2 covers substantial business interests, and Box 3 covers savings and investments. If you arrived on a skilled-worker package, the 30% ruling interacts directly with your taxable income here, and it changed again for 2026 – so it’s worth reading that guide alongside this one before you file.

Couples can file together

Married couples and registered partners count as fiscal partners and can file jointly, allocating deductions like mortgage interest to whichever partner has the higher income to lower the overall bill. It’s one of the simplest ways to legitimately reduce what you owe.

After you file

Your filing feeds into more than just your tax bill – income verification underpins benefits like the healthcare and rent allowances (toeslagen), so an accurate return matters for those too. To see how your take-home pay and tax fit your overall budget, our cost of living guide sets out the numbers by city, and if your work situation changes, our explainer on the UWV covers the benefits side. New arrivals working through the whole setup can keep the sequence straight with our first weeks checklist.

One honest note for some readers: US citizens in the Netherlands generally have to file both a Dutch return and a US return, which is genuinely complex – that’s a case where a specialist adviser earns their fee.