Tax
Crypto and tax
Crypto is taxed very differently in the Netherlands and Belgium. The Dutch system looks at wealth on a reference date; the Belgian system looks at how you behave as an investor. Below we set out the main lines, explains which records you need and where the boundary sits between ordinary management and professional trading. It is general information, not tax advice; consult an adviser for your own situation.
Netherlands: crypto in box 3
For Dutch private individuals, crypto sits in box 3, the levy on wealth. You declare the value of your holdings on 1 January of the tax year, converted into euros at the rate applying then. A tax-free allowance applies; above it, a deemed or actual return is taxed depending on the regime in force.
Gains realised during the year by buying and selling are not separately taxed in box 3, because the levy targets wealth rather than transactions. That changes if trading becomes so intensive and professional that the tax authority treats it as income from other activities or as a business.
- Reference date 1 January, euro value across all wallets and accounts
- The allowance applies to total box 3 wealth, not per asset
- Staking, lending or mining can be treated differently
Belgium: normal management or speculation
Belgium has no general wealth tax on crypto. Treatment depends on behaviour. If you manage your assets as a prudent person, holding long term and without borrowed money, gains are generally untaxed. Where trading is speculative, gains count as miscellaneous income and are in principle taxed at 33%, plus municipal surcharges.
If the activity becomes professional, judged on frequency, organisation and the scale of resources deployed, income falls under progressive rates for professional income. The Belgian ruling commission can issue an advance decision on a specific situation.
Records you need either way
Whatever the jurisdiction, complete records are the foundation. Log per transaction: date and time, assets bought and sold, quantity, euro rate at that moment, fees paid, and the counterparty or wallet used. Export CSV files from every platform periodically; access to history often disappears when a service shuts down.
Keep evidence of the origin of your funds too, such as bank statements for the first deposit. Banks and providers regularly ask for it at larger amounts, and it is useful material in an audit.
- Transaction log with date, amount, rate and fees
- Annual export from every platform and wallet
- Proof of the origin of deposited euros
Common mistakes
The most frequent error is forgetting small balances in old wallets or barely used platforms; they count too. A second is failing to convert crypto-to-crypto swaps, which in many jurisdictions can be a realisation event.
Finally, people underestimate staking and lending rewards. These may be taxed separately and therefore need recording at the moment of receipt, at the rate applying then.
Frequently asked questions
Do I declare crypto if I sold nothing?
In the Netherlands, yes: box 3 looks at holdings on the reference date, not at sales. In Belgium it depends on how your activity is qualified; holding as such is not taxed.
Is swapping bitcoin for ether a taxable event?
In the Netherlands a swap only changes the composition of your box 3 wealth. In Belgium a swap can weigh in the assessment of whether trading is speculative or professional.
What about staking rewards?
Rewards are usually valued at the moment of receipt and, depending on scale and nature, may count as income. Always record the receipt date and rate.
Do tax authorities receive data from platforms?
Yes. Under European reporting rules, service providers share user and transaction data with tax authorities, including across borders. Non-declaration is increasingly visible.
Read next
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How to buy crypto in the Netherlands using euros, iDEAL or SEPA, which providers are MiCA-registered, and what it costs. A practical checklist, not investment advice.
What is MiCA?
MiCA governs licensing, stablecoins and disclosure for crypto across the EU. What changes for users, providers and banks.
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