What are the Belgian income tax brackets?

Belgium uses four national brackets: 25 percent on the lowest band, then 40 percent, 45 percent, and 50 percent on the highest. A tax-free allowance is applied first so the lowest income is untaxed.

What is the municipal surcharge?

On top of national tax, your commune levies additional centimes (opcentiemen / centimes additionnels), typically 6 to 9 percent of the national tax due. A few communes charge 0 percent and some charge more.

How is the tax-free allowance applied?

A basic allowance (around EUR 10,160) is taxed at the lowest rate of 0, effectively exempting it. This calculator subtracts the allowance from the taxable base before applying the brackets, which is a simplified version of the official method.

Does this include social security or tax credits?

No. It estimates income tax plus the municipal surcharge only. Social-security contributions, the marital quotient, dependent-child reductions and other credits are not included, so your actual result will differ.

Is this an official calculation?

No. It is a planning estimate. Brackets, the allowance and reductions change yearly and depend on personal circumstances. Use the FPS Finance Tax-on-web simulator or an accountant for a binding figure.

Belgium Income Tax Calculator

Belgium taxes personal income (personenbelasting / impôt des personnes physiques) with steep national brackets and then adds a municipal surcharge set by your commune. This free calculator estimates the combined bill in your browser using the national progressive scale, the tax-free allowance, and your local surcharge rate.

How it works

Tax-free allowance. A basic amount (around €10,160) is effectively exempt, so it is subtracted from your taxable income first.
National brackets. The remaining income is taxed progressively: 25%, then 40%, then 45%, then 50% on the top band.
Municipal surcharge. Your commune adds opcentiemen / centimes additionnels — a percentage (often 6–9%) charged on the national tax due, not on income directly.

National tax plus the surcharge gives the estimated total.

Example

On €40,000 of taxable income, the allowance is removed, the brackets are applied step by step up through the 45% band, and a 7% municipal surcharge is then added to the national tax. The tool prints each component so you can see how the surcharge scales with the underlying tax.

Notes

This is a simplified planning estimate. It omits social-security contributions, the marital quotient, dependent reductions, and other personal credits, so your assessed tax will differ. For a binding figure use the official Tax-on-web simulator.