Zorglane explains, checks, compares and reminds. It never gives medical advice, never ranks or recommends a specific provider, and never decides whether care is urgent or necessary. Answers are drafted with AI and checked by a person during the founding period; sources are always shown. In an emergency, call 112. Evenings and weekends, call your huisartsenpost.
When your obligation starts
The obligation to have Dutch basic insurance starts on one of two triggers, living in the Netherlands or working here for a Dutch employer while paying Dutch wage tax.
It isn't the day a BSN arrives. A BSN is what's needed to sign up for a policy. The obligation itself can already have started before that.
A residence permit still pending is a different case. While it's pending, Dutch insurance can't be taken out at all. Once the permit is granted, the policy has to start from the date the permit takes effect, not from whenever the application gets filed.
Who this applies to
| Situation | Required? | Source |
|---|---|---|
| Live and work here | Yes, from the first day. | |
| Live here, don't work | Usually yes. The SVB decides unclear cases. | |
| Waiting for a residence permit | Not yet, then from the date it takes effect. | |
| Only studying | Depends on the SVB's assessment. A part-time job makes it yes. | |
| Working here for a foreign employer | Possibly not. The SVB decides, often based on an A1 certificate. | |
| Children under 18 | Yes. Register them, no premium, no deductible. |
The 4-month window
Signing up within 4 months of the obligation starting backdates the policy to the day it began. That back premium isn't a fine. It pays for months already covered.
Insurers have to accept the application. For basic insurance, age or health can't be a reason to refuse someone. Only supplementary cover can be turned down.
A worked example
Mei moves to the Netherlands on 1 March and starts work straight away. Her obligation begins that day. She signs up for insurance on 20 June, inside the 4-month window, so her policy is backdated to 1 March.
Her first bill covers March through June, about €634 at the 2026 average premium of €158.39 a month (an average, her own policy may cost more or less).
If Mei had waited until August instead, she'd be outside the window. No backdating, and no cover for the months before she signed up.
You can claim for those months
Backdated premiums mean backdated cover. Care paid for out of pocket in those months can often still be claimed back from the insurer. In practice, collect the invoices, submit them through the insurer's app or portal, and the normal rules still apply. The deductible still counts, and a provider without a contract with the insurer may only be partly reimbursed. It isn't a guaranteed refund, but it's worth checking rather than writing the cost off.
Healthcare allowance can go back too
Healthcare allowance (zorgtoeslag) works the same way. It has to be applied for, and that can happen after the year it covers. For 2025, applications stay open until 31 December 2026.
If you miss the 4 months
Past the window, cover starts on the date the insurer receives the application. Whatever care happened before that is paid out of pocket, with no backdating to fall back on.
If the CAK (the body that checks insurance status) finds someone uninsured, this is what follows.
- A letter arrives, with 3 months to insure or show that insurance isn't required.
- Miss that, and a fine follows, €529.74 in 2026.
- After 2 fines, the CAK signs the person up itself and withholds the premium from their income for 12 months, at 110% of the standard premium.
Myths, checked
"Travel or international insurance counts"
It doesn't. International and private policies aren't Dutch basic insurance.
"My obligation starts with my BSN"
It starts when living or working here begins. A BSN is just what's needed to sign up.
"I can ignore a CAK letter, I'm already insured"
Act on it anyway. Ask the insurer to confirm the policy is actually registered as Dutch basic insurance.
"They can refuse me over my health"
Not for basic insurance. Insurers must accept everyone, whatever their age or health.
What to check now
- Find the date the obligation actually started, when living or working here began.
- Count 4 months from that date.
- Inside the window, sign up, and gather receipts for care already paid for, to claim them back.
- Outside the window, sign up today. The gap won't be backdated, and waiting longer only costs more.
- Got a CAK letter? Act within 3 months, whatever the situation.
- Lower income? Check whether healthcare allowance applies.
Get the insurance basics as a free PDF →
This guide explains how backdated Dutch insurance and healthcare allowance work. It isn't legal or financial advice. If a situation is unclear, the SVB or CAK can give a definitive answer. Spotted something out of date? Email hello@zorglane.com.
Sources
- rijksoverheid.nl, Ben ik verplicht een zorgverzekering af te sluiten?
- Government.nl, Health insurance and residence permit
- CAK, I am an international student. Why have I received a letter saying I am uninsured?
- Zorgverzekeringswet art. 5, wetten.overheid.nl
- rijksoverheid.nl, Moet een zorgverzekeraar mij accepteren voor een zorgverzekering?
- NZa, Informatiekaart Zorgverzekeringen 2026
- Belastingdienst, Tot wanneer kan ik een toeslag aanvragen?
- rijksoverheid.nl, Wat gebeurt er als ik niet verzekerd ben voor de zorgverzekering?
- CAK, I received a letter that I'm uninsured
- rijksoverheid.nl, Moet ik een zorgverzekering afsluiten als ik in Nederland ga werken?
Get this as a free PDF: download the kit. Want it worked out for your own policy? The Zorglane agent can explain this for your situation. Get started →