Netherlands exit tax: the conserverende aanslag explained

The Dutch exit tax is the one European founders most often misunderstand — not because the rules are obscure, but because the name promises something the mechanism does not deliver.

A conserverende aanslag is a preservation assessment. The Belastingdienst calculates what you would owe if you had sold your shares on the day you stopped being a Dutch tax resident, records that number against you, and then, if you meet the conditions, does not collect it. Founders hear “deferred” and relax. The number is fixed, it is real, and for anyone leaving today it does not expire.

This page is the drilldown on the charge itself. For the full departure sequence — the Article 4 AWR duurzame band test, the BRP uitschrijving, the M-biljet — see how to leave Netherlands tax residency.

The one condition that matters

That middle row is the difference that catches people, and it is worth stating plainly: the Dutch regime has no minimum-residency condition.

Spain’s Article 95 bis requires ten of the previous fifteen years as a resident. Germany’s §6 AStG requires seven of the last twelve. Those tests quietly exempt most of the recent-arrival founder population in both countries. The Netherlands applies no such filter. A founder who moved to Amsterdam two years ago on the 30% ruling, incorporated a BV, and now wants to leave for Bangkok is fully inside the regime — where the identical founder leaving Munich or Madrid would walk away owing nothing.

The 5% threshold also aggregates with a fiscal partner. Two founders who are partners, each holding 3%, are treated as holding 6% between them.

What it costs

The unrealised gain is taxed at box-2 rates. In 2026:

The lower band is small, so the blended rate converges on 31% quickly:

Model anything substantial at roughly 30–31%. Unlike the German calculation, there is no partial-income mechanism reducing the taxable base, and unlike the Spanish one there is no long progressive ladder — box 2 is two bands and the second one arrives almost immediately.

How the Netherlands compares

The same founder — 100% of a company worth €1.5M, incorporated with €25,000, so a €1,475,000 unrealised gain — leaving three different countries:

The headline rates are close. The applicability is not, and that is where the real money sits. The Dutch charge is the most likely of the three to actually fire, because it is the only one with no residency-duration escape hatch. Full workings for the other two: Spain’s Article 95 bis and Germany’s §6 AStG.

Deferral — and the bankgarantie nobody plans for

The assessment is preserved rather than collected, but the terms depend entirely on where you are going:

For a Thailand or Paraguay move this is the operational crux. Deferral requires acceptable security lodged with the Belastingdienst — in practice a guarantee from a Dutch bank equal to the whole assessment. On a €1,000,000 gain that means arranging a guarantee for roughly €305,000 at precisely the moment you are funding an international relocation.

ABN AMRO, ING and Rabobank all process these, but branch-level familiarity varies and the process runs two to four weeks. Start it six weeks before departure. Members who left it to the final fortnight have missed their planned departure date — this is the most common cause of a slipped Dutch exit, ahead of anything in the tax analysis itself.

What lifts the deferral

The preserved assessment becomes payable on:

• Actual sale of the shares
• Gift or transfer to another person
• Dissolution of the BV
• Substantial dividend distribution, in some cases

And on the timing question founders always ask: for assessments issued after 15 September 2015 there is no expiry. The pre-2015 rule wrote the claim off after ten years without a realisation event. That rule is gone. Anyone leaving today should plan on the assessment sitting on the books indefinitely.

The practical consequence is subtle but expensive. The valuation and the rate are fixed on your departure date. If your BV is worth €1.5M when you leave and €400,000 when you eventually wind it down, the Belastingdienst’s claim was set against the €1.5M figure. The assessment does not follow the company down.

What can still be done

Everything runs through the same constraint: the charge crystallises when Dutch tax residency ends, and the BRP uitschrijving is what fixes that date.

1. Sell down below 5%. The threshold is a cliff. Where the cap table and shareholder agreements allow it, moving from 5.5% to 4.9% before departure exits the regime completely.
2. Fix the valuation properly. The assessment follows you indefinitely at the departure-date number. A defensible valuation prepared in advance is worth materially more here than in regimes where the claim expires.
3. Sequence the departure date. Where a funding round or a down-round is in prospect, which side of it you leave on changes the assessment permanently.
4. Budget the guarantee, not just the tax. The bankgarantie ties up capital or credit for an open-ended period. That is a cash-flow constraint on the move itself, distinct from the tax.

What most readers should actually do

If you hold less than 5% of any corporation, the conserverende aanslag is not your problem. Your Dutch exit is the BRP and M-biljet sequence in the leaving Netherlands guide, and the substantive tax bill is zero.

If you hold 5% or more, note that you have no residency-duration defence — the question is only what the shareholding is worth and when you leave. Model it before you fix a departure date, and start the bankgarantie conversation with your bank six weeks out.

Run the Thailand tax calculator for the destination side, compare the Thailand vs Netherlands position, or see the EU exit tax cheatsheet for all eight jurisdictions side by side.

When you want it modelled against your actual cap table and departure window, book the diagnosis call. We will tell you what the assessment looks like on your numbers and whether the guarantee is arrangeable in your timeline.