Scenario comparison
| Scenario |
Federal tax |
Communal tax |
Total tax |
Net salary |
Belgian federal income tax brackets
| Rate | 2025 income range | 2026 income range |
|---|
How Belgian communal tax works
Belgian municipalities levy an additional surcharge on top of federal personal income tax. This communal tax (gemeentebelasting / taxe communale) is calculated as a percentage of the federal income tax amount — not of gross income.
Core calculation logic
Gross salary → employee NSSO (13.07%) → taxable base
taxable base − personal allowance − deductions = net taxable income
federal tax = Belgian progressive brackets applied to net taxable income
communal tax = federal tax × municipal rate ÷ 100
total tax = federal tax + communal tax
net salary = gross − NSSO − total tax
Personal tax allowance
Every Belgian tax resident receives a personal tax-free allowance: €10,910 for 2025 and €11,180 for 2026. This is deducted from taxable income before brackets are applied. Children at charge increase this allowance.
Municipal rates vary
Municipal rates across Belgium range typically from 0% to around 9% depending on your commune. Major cities tend to be at the higher end. Communes publish their rates annually. This calculator uses your entered rate.
Assumptions
This calculator estimates Belgian employee net salary using employee social security, Belgian progressive income tax, and municipal surcharge. Monthly results are estimates and may differ from final payroll or assessment due to withholding rules, dependants, holiday pay, bonus treatment, and employer-specific payroll settings.
Frequently Asked Questions
What is Belgian communal tax?+
Communal tax is a municipal surcharge levied by Belgian municipalities on top of federal personal income tax. It is a percentage of your federal income tax, not of your gross income. Rates differ per municipality.
What is the average communal tax rate in Belgium?+
Most Belgian municipalities charge between 6% and 8%. The calculator defaults to 7% as a midpoint estimate. You should enter your specific municipality rate for an accurate result.
What is employee NSSO in Belgium?+
NSSO (Nationale Sociale Zekerheid / ONSS) is Belgian social security. Private sector employees pay 13.07% of gross remuneration as employee social security contribution. This is deducted from gross salary before income tax is calculated.
What are the Belgian income tax brackets for 2025?+
For 2025: 25% on income up to €16,320; 40% from €16,320 to €28,800; 45% from €28,800 to €49,840; 50% above €49,840. These are federal brackets published by FPS Finance.
Does communal tax apply to non-residents?+
Non-residents generally pay a flat surcharge of 7% instead of municipal communal tax. They also may not receive the full personal tax allowance unless at least 75% of their total professional income is taxable in Belgium.
Why does my monthly net differ from annual divided by 12?+
Belgian professional withholding (bedrijfsvoorheffing) uses specific FPS Finance formula rules, not a simple annual/12 division. This calculator uses the annualised method for monthly estimates. Your actual payslip may differ.