Before you start

A BSN, so payroll can run
A Dutch withholding agent, or a KVK registration if self-employed
DigiD, to file and to see provisional assessments
For the 30% ruling: recruitment from abroad, over 16 of the 24 months before starting spent more than 150 km from the Dutch border, and a salary above the annual threshold

Step-by-step

1
Work out which tax regime actually applies to you
An ordinary employee of a Dutch company is a straightforward box 1 case. A staff member of a treaty organisation usually has that salary exempted under the headquarters agreement while remaining potentially liable on other Dutch-source income. A locally recruited Dutch national in the same building often has no exemption at all. Get this confirmed in writing by your organisation before your first filing season.
Via employerWho: You, with your organisationBefore the first filing seasonFree
2
Hand the BSN to payroll and let loonheffing run
From your first working day a Dutch employer withholds combined wage tax and national insurance premiums. For most employees this is close to the final liability, which is why the system feels lighter than the headline rates suggest.
Via employerWho: Employer runs payroll; you supply BSN and IBANFrom day oneDeducted from gross pay
3
File the 30% ruling inside four months of the first working day
The employer applies jointly with you and the Belastingdienst issues a beschikking. Within four months it backdates to your start date; later, it starts only from the month after approval and those months are lost permanently. A decision takes roughly eight weeks.
Via employerWho: Employer, jointly with youApply within 4 months; ≈8 weeks for a decisionUsually absorbed by the employer
4
Check your box 3 position before the 1 January snapshot
Box 3 is assessed on the assets you hold on 1 January. Assumed returns are applied by asset class above the tax-free allowance and the notional income is taxed at 36%. If your actual return was lower, the tegenbewijs route lets you be taxed on the real figure — but you must claim it and evidence it.
OnlineWho: You, or a belastingadviseurPosition fixed on 1 JanuaryFree to claim
5
File between 1 March and 1 May, and expect separate municipal and water bills
Mijn Belastingdienst opens 1 March with a 1 May deadline. Separately, gemeente Den Haag bills afvalstoffenheffing — €412.56 for a one-person household in 2026, the highest of the four big cities — and Hoogheemraadschap van Delfland charges a watersysteemheffing of €137.51 per household plus a zuiveringsheffing of €115.33 for a one-person household. Renters pay both, and all three tariffs are reset each January.
OnlineWho: You1 March to 1 May; municipal bills early in the year≈€665 a year in local charges for a single renter in 2026

Documents you’ll need

BSN and DigiD
Jaaropgaaf annual income statement and payslips
30% ruling beschikking, if granted
Written confirmation of any treaty tax exemption from your organisation
1 January statements for all accounts and investments, for box 3

Things most newcomers don’t know

A treaty salary exemption covers the salary and nothing else, and partners are usually not covered at all.

Headquarters agreements exempt the organisation's remuneration from Dutch income tax. They do not exempt a spouse's Dutch job, freelance income, Dutch rental income, or in many cases assets. A household can easily have one member fully outside the Dutch system and another fully inside it, filing separately on different bases. Assuming the exemption is a household-level status is a common and expensive misreading.

Source: Ministry of Foreign Affairs; Belastingdienst

Box 3 taxes a return the state assumes you earned, and it is the most surprising rule in the Dutch system.

Assets above the allowance are assigned fixed notional yields by category — low for bank deposits, much higher for everything else — and that imaginary income is taxed at 36%. Someone whose investments fell in value can still owe tax on a gain they never made. The tegenbewijs counter-proof route now allows taxation on the real return, but the burden of claiming and evidencing it is entirely yours.

Source: Belastingdienst

The four-month deadline on the 30% ruling is a cliff, and employers new to expats miss it.

Apply within four months of the first working day and the ruling backdates to that day. Apply on day 125 and it starts only after approval, and those months are gone for good — typically several thousand euros. Organisations that hire internationals rarely miss it; Dutch employers hiring their first foreign specialist very often do. Chase it in week one and get the submission date in writing.

Source: Belastingdienst; Business.gov.nl

Whether you get 30% or 27% depends on when your ruling started, not on the calendar year.

Rulings granted before 1 January 2024 keep 30% for their remaining term. Rulings granted from 2024 onward hold 30% through 2026 and step down to a flat 27% from 1 January 2027. Two people doing the same job on the same salary can take home materially different amounts purely because of start date, and the later starter should budget for the step-down rather than treat it as a surprise.

Source: Business.gov.nl

Common mistakes to avoid

Assuming a treaty tax exemption extends to a partner's Dutch salary or to Dutch-source investment income.
Letting the 30% ruling application drift past four months and losing the backdating permanently.
Budgeting on 30% when a ruling granted from 2024 steps down to 27% in 2027.
Being caught by box 3 on a 1 January balance after a late-December bonus or property sale.
Skipping the first-year M-form, which sits outside the online portal and usually produces a refund.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.