From 2028, the Netherlands will tax actual annual returns in Box 3 instead of a fictional assumed yield. This means you will pay tax on your real profit: the difference between your assets on 1 January and 31 December, including unrealised gains. The proposed rate is 36% on taxable return, after deducting eligible costs and applying the annual tax-free return allowance.

This Box 3 tax calculator helps you quickly estimate:

• Your absolute annual profit

• Your return in percentage terms

• The deductible amount (such as financing costs or custody fees)

• The tax-free return allowance

• Your expected Box 3 tax liability

Simply enter the value of your assets at the beginning and end of the year to see how the new Dutch wealth tax rules could affect you.

Use this tool to plan smarter, compare scenarios, and understand your potential tax exposure under the new 2028 Box 3 system.

Disclaimer: This calculator provides an estimate only and does not constitute tax advice.