Calculate Belgian income tax with official FPS Finance rates. Belgium has one of the highest tax burdens in the EU with progressive rates up to 50% plus municipal surcharge and 13.07% social security.
Enter your income for accurate 2026 Belgium tax calculations
Federal progressive tax rates apply to taxable income (after social security). Municipal surcharge (0-9%) is added on top of federal tax.
| Taxable Income (EUR) | Federal Rate | + Municipal (7%) | Combined Marginal |
|---|---|---|---|
| €0 - €15,820 | 25% | +1.75% | 26.75% |
| €15,820 - €27,920 | 40% | +2.8% | 42.8% |
| €27,920 - €48,320 | 45% | +3.15% | 48.15% |
| Over €48,320 | 50% | +3.5% | 53.5% |
Belgium's social security system funds healthcare, pensions, unemployment benefits, and family allowances.
See how Belgian income tax affects different income levels (municipal rate: 7%)
Belgium has progressive federal income tax rates: 25% (up to €15,820), 40% (€15,820-€27,920), 45% (€27,920-€48,320), and 50% (over €48,320). Additionally, municipalities levy a surcharge of 0-9% on the federal tax (average ~7%), making effective top marginal rates around 53-54% before social security.
Belgian employees pay 13.07% of gross salary in social security contributions (ONSS/RSZ). This is deducted from your salary before calculating income tax. There is no cap on employee contributions - it applies to your entire salary. Employers pay an additional 25-33% on top, making total labor costs very high.
For 2026 (Assessment Year 2027), Belgium's basic tax-free allowance is €10,910. This works as a tax credit of €2,727.50 (€10,910 × 25%). Additional allowances apply for spouse and children. If your net taxable income (after social security) is below €10,910, you pay no income tax.
Belgian municipalities levy a surcharge on your federal income tax ranging from 0% to 9% depending on where you live. Brussels municipalities average 6-7%, Flanders averages ~7%, and Wallonia averages 7-8%. This is calculated as a percentage of your federal tax, not your income.
Belgium has one of the highest tax burdens in the OECD due to its extensive social safety net including universal healthcare, generous unemployment benefits (up to 65% of salary), and comprehensive pension system. The tax wedge (total tax on labor) averages 52.6% - second highest in OECD after France.
The Belgium tax filing deadline is typically June 30 for paper returns and mid-July for online filing via Tax-on-web (MyMinfin). For income earned in 2026, you file in 2027 (Assessment Year 2027). Most employees receive pre-filled returns from FPS Finance based on employer reports.
To calculate Belgian income tax: 1) Deduct social security (13.07%) from gross salary to get taxable income, 2) Apply federal progressive brackets (25-50%), 3) Subtract the tax-free credit (€2,727.50), 4) Add municipal surcharge (e.g., 7% of federal tax). Use our calculator above for instant results.
See how Belgium's high taxes compare to neighbors and other destinations
Data Source: FPS Finance (SPF Finances) Belgium
Verified for 2026 | Official government rates | Last updated: January 2026
This calculator provides estimates based on official Belgian FPS Finance rates and ONSS social security contributions. For personalized tax advice regarding deductions, family situations, or regional benefits, please consult a qualified Belgian tax advisor (fiscalist).