ExpatTaxCare — tax services for expats in the Netherlands
Contact us
Skip to main content
Search terms…
< All Topics

Foreign Assets and Crypto in Box 3

Published
Updated
ByJolande Geerts

Short answer

Foreign assets and crypto are not “informal” just because they sit outside the Netherlands or outside a Dutch bank. Belastingdienst’s current Box 3 guidance expressly refers to cryptocurrency, foreign accounts and second or holiday homes as assets that can matter in Box 3. The hard part is usually not spotting the category. It is collecting the right 1 January value, keeping a usable evidence trail, and deciding whether your case is better handled under the normal notional-return framework or the actual-return route.

Who this article is for

This page is for:

  • expats with foreign bank and investment accounts
  • crypto holders
  • people with property abroad
  • readers whose 30% ruling or residence position may change whether foreign assets are in scope

Start with scope, not with valuation

Before you spend hours on statements and screenshots, answer this first:

Are these assets in Dutch Box 3 for me in the relevant year?

That depends on your wider filing position, including:

  • tax residency
  • non-resident treatment
  • migration-year facts
  • whether partial foreign tax liability under the 30% ruling still applies

Once the asset is in scope, the valuation and evidence work begins.

What Belastingdienst already treats as Box 3-relevant examples

Belastingdienst’s current provisional-assessment guidance says that Box 3 assets can include:

  • balances of payment, savings and investment accounts
  • the value of cryptocurrency
  • the value of a second house or holiday house

That matters because it gives expats a strong official reference point for the most common cross-border fact patterns.

Foreign bank and savings balances

Belastingdienst’s actual-return details page is especially practical for foreign accounts. It says that for bank and savings balances abroad you may need:

  • the name and account number of each account
  • the overview of the interest you received
  • exchange-rate support for foreign-currency accounts

It also says that bank-account costs are not deductible from actual returns. That is a good example of why readers should not improvise a homemade “economic reality” calculation.

Foreign investments

For foreign investments, the main risk is not just the number. It is whether the evidence is complete enough and whether you can explain the category of each holding clearly.

The broader Box 3 system distinguishes between bank balances and investments and other assets, so readers should not dump everything into one spreadsheet line and hope for the best.

Crypto

Crypto causes three recurring errors.

1. Treating it as invisible

Belastingdienst explicitly mentions cryptocurrency. So “it is only on an exchange / wallet” is not a safe reason to ignore it.

2. Using the wrong date

For Box 3 scope and the standard system, the 1 January position remains crucial.

3. Using poor evidence

A neat screenshot taken weeks later is often weaker than a properly preserved account or wallet record tied to the relevant date.

Foreign property

Property abroad often creates confusion because people ask the wrong tax question first.

The first question is not: “Is the property in Spain, India or the UK?”

The first question is: “What is my Dutch tax position for this year?”

If you are in the Dutch resident Box 3 lane, foreign real estate can still be relevant. If you are a non-resident taxpayer, the Dutch non-resident rules are much narrower. That is why this page should be read together with the tax-residency page.

Why the actual-return route matters here

Belastingdienst says that the notional-return system remains in place until likely 1 January 2028, unless your actual return is lower.

Foreign assets and crypto are exactly the kind of facts that can make that comparison important. Belastingdienst’s actual-return page also says that the tax authority does not already have all the necessary details. You must gather them yourself.

So if your standard Box 3 outcome looks too high, a foreign-asset file with good evidence may matter a lot.

What a strong evidence pack looks like

For most expat readers, the evidence pack should include:

  • 1 January balances
  • annual statements
  • foreign-currency conversion support where relevant
  • wallet or exchange records for crypto
  • property documents where relevant
  • debt documentation if those debts reduce the taxable base

Common mistakes

  • treating foreign assets as out of scope without testing residency first
  • valuing crypto on the wrong date
  • relying on weak screenshots or incomplete exchange exports
  • forgetting foreign-currency conversion support
  • starting evidence collection only after Belastingdienst asks for more detail

What to do now

  1. Confirm first that the assets are in scope for your Dutch filing position.
  2. Gather 1 January evidence for every foreign account, investment and crypto holding.
  3. Separate bank balances from investments and other assets.
  4. If the standard Box 3 result seems too high, check whether the actual-return route may be relevant.

Official sources

Related articles

Tags: