Income tax in the Netherlands for newcomers: the M-form for your migration year, why refunds are common, and the 30% ruling

Dutch income tax mostly runs on its own. Your employer withholds tax from every salary payment, and for many people that is the end of it. The year you move here is different. You lived in the Netherlands for only part of the year, so the standard online return does not fit, and the Belastingdienst (Tax Administration) uses a special migration return instead: the M-aangifte, historically the paper 'form M' (M for migration). That return often ends in a refund. Separately, employees recruited from abroad may qualify for the 30% ruling (expatregeling), which makes part of the salary tax-free for up to 5 years. This guide covers both, plus the deadlines, the letters, and the problems newcomers actually run into.

Every payslip shows your gross wage, your net wage, and the amount in between: the loonheffing (wage withholding). Your employer deducts it and pays it to the Belastingdienst for you. It covers wage tax plus national insurance contributions for state pension and long-term care. The official rule is short: wage tax is an advance levy of income tax. The annual income tax return (aangifte inkomstenbelasting) then calculates your real tax over the whole year. If too much was withheld, you get the difference back. If too little was withheld, you pay the rest. The employment contracts guide explains how to read the payslip and the jaaropgaaf (annual wage statement) behind these numbers.

The return sorts your income into three boxes. Almost all newcomers with a job only deal with Box 1. Box 3 becomes relevant once your savings and investments pass the tax-free amount.

The first Box 1 bracket of 35.75% is mostly not income tax: 27.65 percentage points are national insurance contributions and 8.10 points are income tax. Tax credits (heffingskortingen) then reduce the bill. Your employer already applies them in the monthly withholding. This is why the deduction on your payslip is far below 35.75% of your gross salary.

The M return exists for one situation: you lived in the Netherlands for only part of the year, because you immigrated or emigrated. It replaces the standard return for that one year. The next year you file a normal return like everyone else.

You file it online. Log in to Mijn Belastingdienst with your DigiD or with an EU-approved login key from another EU country. Under 'Inkomstenbelasting', choose the return for people who lived outside the Netherlands for part of the year: 'Aangifte inkomstenbelasting voor belastingplichtigen die een deel van het jaar buiten Nederland wonen'. The online migration return opens later than the standard one: the 2025 version became available on 1 May 2026. Online filing works for the previous 5 years.

If you cannot or do not want to file online, request the paper tax return form M from the Belastingdienst. It arrives within 2 weeks. The paper M forms exist in Dutch only, so most people are better off with the online version plus a translation tool, or with help. Where to find help in English is covered under common problems below.

The loonheffing on your payslip is an advance, calculated per month. The tax return calculates the final amount over your actual income for the whole year. In a migration year those two numbers usually do not match, because you earned a Dutch salary for only part of the year. The Belastingdienst itself lists 'you lived in the Netherlands for only part of the year and received wages' as a standard situation in which you get money back.

An example: you arrive on 1 September 2026 and start a job at €4,000 gross per month. From September to December your employer withholds loonheffing on four salary payments. Your actual Dutch annual income for 2026 is €16,000. The M return calculates the final tax on that €16,000, including your tax credits. If the four months of withholding add up to more than that final amount, the difference is paid back to you after the assessment.

The refund only comes after you file. Filing is voluntary when you owe nothing and received no aangiftebrief, and it pays whenever the refund is more than the refund limit (€18 for 2025). You can file up to 5 years back: the 2025 return can be filed until 31 December 2030. After filing an M return you usually hear back within 3 months.

The aangiftebrief (tax return letter) is the letter that tells you to file. If you receive one, filing is mandatory. For a standard year the letter typically arrives in February and the deadline is 1 May. Migration years run later: the online M return opens on 1 May, and for the 2025 migration year the Belastingdienst set the deadline at 1 July 2026. The date in your own letter is the one that counts. The letter about the M return goes to your Dutch home address, provided your details in the BRP (the municipal population register) are correct. Registering correctly is covered in the BSN and gemeente registration guide.

You can have a duty to file even without a letter. If you expect to owe more than the assessment limit (€57 over 2025), you must file without waiting for an invitation. If you expect money back, filing is your own choice, and usually a profitable one.

If you need more time, request a postponement (uitstel) before your deadline passes. For migration and foreign returns this does not work online. Download the form 'Aanvraag uitstel aangifte inkomstenbelasting' and post it, or arrange it by phone via the Tax Information Line for non-resident tax issues. Postponement does not stop the interest rule: if a payable assessment is imposed after 1 July, the Belastingdienst charges interest from 1 July. Postponement also extends the Belastingdienst's own deadline. The period of your uitstel is added to the 3 years they have for the final assessment.

The Expat Scheme, still commonly called the 30% ruling, lets your employer pay up to 30% of your salary untaxed, as compensation for the extra costs of a temporary stay in the Netherlands. Your employer applies it in the payroll, so your monthly net salary goes up. In 2026 the untaxed part is capped at €78,600 for a full year, the maximum at a salary of €262,000 or more. The scheme is not automatic: you and your employer apply for it together, and the Belastingdienst issues a decision (beschikking).

The conditions, checked at the start and during the scheme:

• You are in paid employment, and your employer recruited you outside the Netherlands.
• You lived more than 150 kilometres from the Dutch border, as the crow flies, for more than 16 of the 24 months before your first working day in the Netherlands.
• Your taxable salary in 2026 is above €48,013. Under 30 with a Dutch academic master's degree or an equivalent foreign degree: above €36,497.
• Scientific researchers at designated institutions and doctors training to become specialists have no salary norm.

Send the application within 4 months of your first working day. The scheme then applies from that first working day. Apply later, and it can no longer start from day one, so the first months of tax advantage are gone. The Belastingdienst decides within 8 weeks. The decision runs for a maximum of 5 years, and earlier periods of living or working in the Netherlands are deducted from those 5 years. The end date is printed on the decision.

The percentage is changing. From 1 January 2027 the maximum drops from 30% to 27% for everyone who entered the scheme after 1 January 2024; Business.gov.nl explains the change. Employees who already used the scheme before 2024 keep 30% for their full term. Older articles also mention 'partial foreign tax liability', an option for ruling holders to keep most savings out of Box 3. That option ended: from the 2025 tax return you can no longer choose it.

A tax refund normally arrives once, after the year has ended and you have filed. A provisional assessment (voorlopige aanslag) turns that into monthly amounts during the year itself. It works in both directions: a monthly refund when you expect deductions, such as mortgage interest on a bought home, and a monthly payment when you expect to owe tax on income without withholding. You apply in Mijn Belastingdienst and hear back within 8 weeks. A provisional assessment renews automatically each year, with a letter in mid-December. Check it every December and change or stop it when your income changes. Otherwise you receive money now that the final assessment claims back later.

The online return requires a DigiD login, and DigiD requires a BSN (citizen service number). So the order is: BSN first, then DigiD, then the return. Apply for DigiD at digid.nl as soon as you have your BSN; the first 90 days checklist walks through the setup. If the deadline is near and you still have no DigiD, three routes remain: log in with an EU-approved login key from another EU country if you have one, request the paper form M, or request postponement before the deadline and file once your DigiD works.

The Belastingdienst states plainly that the paper M forms are available in Dutch only, and the letters, starting with the aangiftebrief, carry Dutch names for the same reason. The deadlines apply even when you did not understand the letter; the system counts on you arranging the translation. Three things help. The English section of belastingdienst.nl explains most letters and procedures. The Tax Information Line for non-resident tax issues answers questions on +31 555 385 385, from within the Netherlands (055) 5 385 385, Monday to Thursday 8:00-20:00 and Friday 8:00-17:00. And DigiD lets you authorise someone you trust to manage your tax affairs for you, so a Dutch-speaking friend or a tax adviser can file on your behalf.

If you moved in 2025 and did not file before 1 July 2026, file now. The sequence after a missed deadline is predictable: the Belastingdienst sends a reminder (herinnering), then a formal demand (aanmaning) with a final date. A fine of €469 only follows when you also miss the date in the aanmaning, and it can grow to €6,709 for repeated failure. No fine is imposed when the delay is not your fault. If your late return leads to a payable assessment after 1 July, interest runs from 1 July. A refund stays claimable for 5 years, so a late return still pays out.

The scheme only works through your employer, and nothing starts until someone sends the application. Employers with little international staff experience sometimes assume it happens automatically. Raise it yourself in your first weeks. You and your employer fill in the application form together, and only an application within 4 months of your first working day secures the scheme from day one. If you apply later, the scheme cannot start from your first working day, and the months in between lose the advantage. Changing jobs while you hold the ruling follows the same rule: submit the new application within 4 months of starting at the new employer, and the scheme continues from your first working day there.

The Belastingdienst says you usually hear within 3 months of filing an M return. The legal outer limit is much longer: the final assessment for a migration year may take up to 3 years, so for a 2025 return no later than 31 December 2028, and postponement stretches that limit further. Two practical consequences follow. File as early as the online return allows, from 1 May. And do not plan your budget around the refund before the assessment letter has arrived.

Income tax touches two neighbouring subjects with their own guides. Your employment contract determines what appears on the payslip that feeds your return; the employment contracts guide covers contract types, the payslip and the jaaropgaaf. And toeslagen (benefits such as rent and healthcare allowance) are not income tax, but they use the same income figure, so a wrong income estimate hits both; the toeslagen overview explains how that system works.