Heffingvrij Vermogen

Heffingvrij vermogen is the tax-free allowance for Box 3 assets in the Netherlands. The first €57,000 of net assets per person (or €114,000 for fiscal partners) is exempt from Box 3 taxation. Only assets above this threshold generate a deemed return subject to the 36% tax rate.

Impact on prediction market traders

If your total savings and investments — including prediction market account balances, crypto wallets, stocks, and bank deposits — are below €57,000 on January 1, you owe zero Box 3 tax regardless of how much profit you made trading during the year.

Example

You have €90,000 in total Box 3 assets on January 1 (including €15,000 in a Polymarket wallet). The taxable base is €90,000 − €57,000 = €33,000. The deemed return on €33,000 is taxed at 36%.

Planning tip

Since Box 3 is measured on January 1 only, some Dutch taxpayers strategically reduce their asset holdings around the reference date. However, the tax authorities have anti-abuse rules for artificial structuring.

How prediction market platform balances are valued

For Box 3 reporting, your prediction market holdings on January 1 include:

• Cash balances: USD deposits on Kalshi, converted to EUR at the ECB reference rate
• Open positions: The market value of unsettled contracts
• Crypto wallets: USDC or other stablecoins held for Polymarket trading, valued at the January 1 exchange rate

These all count toward your total Box 3 assets and are compared against the heffingvrij vermogen threshold.

Frequently asked questions

If my total assets are below €57,000, do I still need to report them?

Yes. You must still complete Box 3 of your tax return even if your assets are below the threshold. The Belastingdienst needs to verify your declaration. You simply won't owe any Box 3 tax.

Does the threshold change each year?

The heffingvrij vermogen amount is adjusted periodically. It was raised from €50,650 to €57,000 in recent years. Check the Belastingdienst website for the current year's threshold.