Erfbelasting: The Inheritance-Tax Risk Expats Don't See Coming

Most expat financial planning stops at retirement math: contributions, allocation, withdrawal rate. Almost nobody building toward FI in the Netherlands has looked at what happens to that portfolio if they die while still resident here, or shortly after leaving. That gap is worth closing before it matters, not after.

The core exposure

If you're a Netherlands resident when you die, the Belastingdienst can tax your worldwide estate under erfbelasting — not just the assets physically in the Netherlands. Your NL brokerage account, your home-country pension pot, property abroad, all of it potentially falls inside the taxable estate.

How much tax gets owed depends heavily on who inherits. Dutch inheritance tax uses steep, relationship-dependent brackets: spouses and children get materially larger exemptions and lower rates than more distant relatives, and unrelated heirs — which, critically, can include an unmarried partner without the right legal arrangement in place — are taxed far more harshly. The exact exemption amounts and rate brackets change and are not something to estimate from memory; check the current figures directly on belastingdienst.nl before doing any planning math with them.

Why this is an FI problem specifically

Generic inheritance-tax guidance assumes a modest estate: a house, some savings, maybe a small investment account. That's not the profile of someone who has spent years deliberately building an FI-sized portfolio. A stash designed to fund decades of living expenses is, by construction, a large taxable estate — often much larger than the person holding it thinks of it as, because they're mentally categorizing it as "my number," not "my estate."

Two failure modes show up constantly in this specific situation:

• No will covering NL assets at all. Plenty of expats have a will from their home country, if they have one, and assume it covers everything. Whether it actually reaches Dutch-situated assets — and which country's succession law even applies — is not something to assume either way.
• Dutch intestacy rules apply by default when there's no valid election in place. Dutch intestacy law has its own logic about who inherits what, and it doesn't know or care what you'd actually have wanted. For an unmarried couple in particular, intestacy can leave a partner with far less protection than either of them assumes.

The larger the portfolio, the more expensive it is to leave this to default rules.

Cross-border complexity: the law that applies isn't automatic

Under the EU Succession Regulation (Brussels IV), you can generally choose to have your home country's law govern the succession of your entire estate, instead of the law of your country of residence — but only if you make that choice explicitly, in a will. Without that election, Dutch law can end up governing succession of your Dutch-situated assets by default, simply because you're a Dutch resident when you die.

This is a choice-of-law mechanism, not a choice of tax outcome — electing your home country's succession law doesn't automatically mean Dutch inheritance tax stops applying. And very few countries have a tax treaty with the Netherlands that specifically covers inheritance tax, unlike the dense network of income-tax treaties most expats are used to relying on. That means double taxation — your estate taxed once by the Netherlands and again by your home country — is a real, live risk in a lot of expat situations, not a corner case. Working out whether a specific treaty applies, and how the two systems interact for your specific combination of nationality, residency, and asset location, is exactly the kind of question that needs a cross-border-qualified notary or adviser, not a generic guide.

The unmarried-partner gap

This is the sharpest edge in the whole system. Two people who have lived together for years, who consider themselves partners in every practical sense, can be treated by Dutch inheritance tax as complete strangers to each other if they haven't put the right legal agreement in place — meaning the highest rate bracket and the smallest exemption, applied to whatever one partner leaves the other.

The gate here is the same one that governs fiscal partnership for Box 3 purposes, covered in Box 3 for couples: splitting the allowance as fiscal partners — a notarial cohabitation agreement meeting specific conditions, not just living together or being registered at the same address. If you haven't checked whether your relationship meets that bar for tax purposes, it's very likely also not protecting your partner for inheritance purposes either. These aren't two separate boxes to tick; it's the same underlying gap showing up twice.

The practical next step

Get a will that explicitly does two things: covers your Dutch-situated assets, and makes an explicit governing-law election under Brussels IV rather than leaving it to default. A home-country will that never mentions the Netherlands is not the same thing.

Revisit it after any of the events that actually change the analysis — marriage, buying a home, having children, a partner's situation changing, or planning to leave the Netherlands, since departure changes your residency status but not necessarily your exposure to Dutch inheritance tax on assets that stay behind. A will written for your situation five years ago is not a will written for your situation now.

None of this replaces sitting down with a notary who specifically handles cross-border estates. The mechanics above describe the shape of the exposure — the numbers, the treaty position for your specific country pair, and the drafting itself need a professional who can see your actual situation, not a guide written for expats in general. If financial independence is part of your plan, the plan isn't finished until it accounts for what happens to the stash if you don't get to spend it yourself.