How to file your first Dutch tax return (the M-form)

The short version

• You file your first Dutch tax return on the M form, not the ordinary one, because you lived outside the Netherlands for part of that year.
• You can file it online in Mijn Belastingdienst with a DigiD. The paper form M exists for people who cannot.
• If the Belastingdienst wrote to you, the date in that letter is binding. It is usually 1 May.
• No letter does not mean no return. You still have to file if you owe more than the published minimum, and you can claim a refund up to 5 years after the year ends.
• Part of a year in the Netherlands on Dutch wages is on the Belastingdienst's own list of situations where money usually comes back.

For the year you moved to the Netherlands you were a resident taxpayer for part of it and not for the rest. The return built for that split year is the M return. M for migration.

It has a reputation for being the difficult one, and most of that reputation comes from the paper version. Here is who has to file, when it is due, what to have in front of you, and why so many first returns end with money coming back.

What the M-form is

The Belastingdienst, the Dutch tax authority, describes it as the return for "taxpayers living outside the Netherlands for part of the year", and it is used for the year you immigrate or emigrate. One form covers both halves of that year, which is why it asks more questions than a normal return.

You do not have to hunt for a separate M-form online. Log in to Mijn Belastingdienst, the tax authority's portal, and under income tax pick the option named "Aangifte inkomstenbelasting voor belastingplichtigen die een deel van het jaar buiten Nederland wonen doen". That mouthful is the M return. The naming is your first warning that the interface is in Dutch.

The paper form M is still there for people who cannot or would rather not file online. You order it from the Belastingdienst and it arrives within 2 weeks, so it is not something to start once a deadline is close.

Whether you have to file at all

Two separate things can put you in scope, and people usually only know about the first.

A letter arrived. If the Belastingdienst sent you an aangiftebrief, the letter inviting you to file, filing is compulsory and the date printed on it is the one that counts.

No letter arrived. You still have to file if you owe more than the aanslaggrens, the minimum amount the Belastingdienst will raise an assessment for. And you can choose to file when you are owed more than the teruggaafgrens, the minimum it pays out. Both are reset every year and published per tax year, so check the figure for your year rather than assuming a small refund is not worth the hour.

Nothing about this is limited to full-time employees. The Belastingdienst's own check for whether you get income tax back names studying and not having worked the whole year as situations to look at. If you arrived in September with a bijbaan, a part-time job alongside your studies, you are the case it is describing.

Why your first return often ends in a refund

Your employer already withholds loonheffing, the payroll tax deducted before your salary reaches you. That is an advance, not a final bill. The Belastingdienst works out the tax on your whole year, subtracts what was already withheld, and pays back or charges the difference.

Arriving part way through a year is exactly the situation where those two numbers drift apart. The Belastingdienst lists living in the Netherlands for only part of the year while receiving wages or a benefit among the cases where you should check for a refund.

When your return has to be in

Your return has to reach the Belastingdienst before the date printed on your aangiftebrief. That date is usually 1 May.

If you cannot make it, you can ask for postponement. Ask before 1 May through Mijn Belastingdienst, by phone, or on the paper form, and you get until 1 September.

If no letter ever came, that date is not yours to miss. You can file up to 5 years after the end of the tax year, which is what makes it worth going back to the year you arrived even if you have been here a while. Read that window as a way to claim money back, not as permission to sit on tax you owe.

What you need before you start

Gather this first. The online return is a bad place to discover a missing document.

• A DigiD, or a European login from your own EU country
• Your BSN, and your partner's and children's if you have them
• A Dutch bank account number in your own name for the refund
• The jaaropgaaf, the annual income statement, from every employer you had that year, or your payslips if a statement never came
• Statements for your current, savings and investment accounts
• If you own property here: the WOZ valuation your gemeente sets, and your mortgage annual statement
• Proof of anything you want to deduct, such as healthcare costs or gifts to charity

The bank account matters more than it looks. The Belastingdienst pays refunds into an account it already holds for you, and its immigration checklist asks new arrivals to supply one for exactly that reason.

How to file your first Dutch tax return online

The Belastingdienst sets the process out in order: prepare, open the return, check, then sign and submit.

The check step is the real work. Parts of the return are pre-filled from data the Belastingdienst already holds, and you are asked to compare that against your own documents and correct it. Pre-filled is not the same as verified, particularly in a year when you were only here for part of it.

No DigiD yet? You can apply for one from abroad, use a European login from your country of residence, or fall back to the paper form M.

What happens after you file

File before 1 April and the Belastingdienst tells you where you stand before 1 July. File later and it aims for 3 months.

Aims is the right word. The first thing you receive may only confirm that your return arrived and that an assessment follows. On paper the Belastingdienst has up to 3 years after the end of the tax year to issue the final assessment, and it repeats that on the migration page itself. Silence well past the target is not a sign that something went wrong.

When to pay a tax advisor

A year with one Dutch employer, one address and no property is a return you can file yourself in an evening. Paying someone to do that is buying convenience, not accuracy.

The case for hiring changes when the year does not fit inside one country. Income from two tax systems, a business, property abroad, a 30% ruling question, or a paper M form you cannot read are the situations where an English-speaking advisor earns the fee. Both firms below work in English and take on internationals. Ask what a migration year costs before you commit, because it is not the same job as an ordinary return.

Tax advisors who work in English

B

Blue Umbrella

English-speaking tax service for internationals. Specializes in 30% ruling and expat situations.

J

J.C. Suurmond

Established Dutch tax consultancy with a strong international practice. Good for complex situations with multiple income sources.