Box 3 hub
Quick answer: Box 3 taxes a notional return on savings and investments above an exemption under rules that can change by tax year. Use the Box 3 guide for a provisional 2026 planning estimate.
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Coverage gaps
- We do not replace the actual-return calculation in your income-tax return
- We do not model every asset-class edge case or litigation outcome
Verify volatile figures on Belastingdienst pages and our methodology.