Financial Calculators

Free interactive tools to help you plan your investments and understand your taxes.

📊 Compound Interest Calculator

See how your investments grow over time with the power of compound returns. Adjust your initial investment, monthly contributions, expected return, and time horizon to visualize your wealth accumulation.

Initial investment (€) Monthly contribution (€) Expected annual return (%) Time horizon (years)

🇳🇱 Box 3 Tax Estimator

Estimate your Box 3 tax liability based on your total assets and the forfait return rate. This calculator uses the 2026 tax rates and thresholds (heffingsvrij vermogen €59,357/person, 6.00% forfait rate for investments, 36% tax rate) to give you an estimate of what you'll owe to the Belastingdienst.

Total assets (€) Actual return (%) Filing as

👴 Pension Gap Calculator

Calculate how much you need to save monthly to fill your pension gap and maintain your desired lifestyle in retirement. Takes into account AOW, occupational pension, and your investment returns.

Current age Desired retirement age Current annual income (€) Desired income replacement (%) Expected AOW (€/month) Expected occupational pension (€/month) Expected annual return (%)