Belgium Income Tax 2026: PB/IPP Brackets, RSZ, and Net Salary Calculator
June 2026 · 9 min read
Belgium has one of the most complex income tax systems in Europe, combining federal income taxes, communal (local) surcharges, and a mandatory social security contribution of 13.07%. On top of this, a professional expense deduction and a personal exemption reduce the taxable base before any bracket rates apply. This guide breaks down every layer so you know exactly what your Belgian net salary looks like in 2026.
The Belgian federal income tax brackets (PB / IPP)
Belgium's personal income tax, known as Personenbelasting (Dutch) or Impôt des Personnes Physiques (French), uses four progressive brackets at the federal level:
| Annual taxable income | Federal rate |
|---|---|
| Up to €15,820 | 25% |
| €15,820 to €27,920 | 40% |
| €27,920 to €48,320 | 45% |
| Above €48,320 | 50% |
These rates are marginal: the 50% rate only applies to the portion of taxable income above €48,320.
How taxable income is calculated
Taxable income in Belgium is not simply your gross salary. Before applying the brackets, two key deductions are applied:
1. Professional expense forfait (Aftrek voor beroepskosten): Employees can deduct a flat-rate professional expense allowance of 30% of gross salary, subject to a minimum of €540 and a maximum of €5,870 (2026 figures). This is applied before computing income tax.
2. Personal exemption (Belastingvrije som): Every resident taxpayer receives a basic personal exemption of approximately €9,270. This amount is deducted from net professional income (after the professional expense deduction) before brackets are applied.
So the calculation runs: Gross salary minus professional expenses minus personal exemption equals taxable income.
The communal tax surcharge
On top of the federal tax, Belgian municipalities levy an additional surcharge on your federal tax bill. This surcharge varies by municipality, ranging from roughly 0% (certain Brussels communes) to over 9% in some cities. The national average is approximately 7%, which is the figure used in our calculator. If you live in a lower-tax commune, your actual bill will be slightly less.
Social security: RSZ / ONSS (13.07%)
Belgian employees pay a flat 13.07% social security contribution on their gross salary. There is effectively no ceiling for most workers. This contribution funds pensions, unemployment benefits, and health insurance through the RIZIV/INAMI system.
| Gross salary | RSZ (13.07%) | Federal tax + communal | Net salary |
|---|---|---|---|
| €30,000 | €3,921 | €3,520 | €22,559 |
| €50,000 | €6,535 | €9,620 | €33,845 |
| €75,000 | €9,803 | €18,640 | €46,557 |
Key takeaways
- Belgium has a relatively high top rate of 50%, reached at just €48,320 of taxable income.
- The professional expense deduction and personal exemption significantly reduce the taxable base for most workers.
- The communal surcharge varies by municipality. Moving to a lower-tax commune can meaningfully improve your net pay.
- Social security at 13.07% is among the highest flat-rate employee contributions in the EU.
Use the GrossToNet Belgium calculator to get your precise net salary for 2026.