Belgium Income Tax Calculator 2026 — 25% to 50% + Social Security

Belgium has 4 progressive income tax brackets for 2026: 25% on €0–€15,820, 40% on €15,820–€27,920, 45% on €27,920–€48,320, and 50% on all income above €48,320. These are federal brackets; a municipal surcharge (communal tax) is added on top, which averages approximately 7% of the federal income tax across Belgium.

Belgium provides a tax-free amount (belastingvrije som) of €10,570 per taxpayer for 2026. This amount is not exempt from the calculation — instead, it creates a tax reduction equivalent to the 25% rate applied to €10,570, giving a tax reduction of €2,643. Additional tax-free amounts are available for dependents, disability, and single parent status.

Belgian employees pay social security contributions of approximately 13.07% on their gross salary. This is a mandatory deduction and reduces the gross salary before income tax is applied in some calculations. For tax purposes, Belgian social security is deductible from income. The employer also pays approximately 25–30% social security on top of the gross salary.

The municipal surcharge (gemeentebelasting or opcentiemen) varies by municipality but averages approximately 7% of the federal income tax across Belgium. Brussels city is around 5.5%, Antwerp 6.95%, Ghent 7%, Liège 8%. This means the same federal taxable income can result in different total tax depending on where you live in Belgium.

Belgium and the Netherlands have broadly similar high tax burdens but different structures. Belgium uses 4 brackets (25%–50%) with a 13.07% social security contribution. The Netherlands uses 2 main brackets (36.97% to €76,817, then 49.5% above), with social security bundled into the first bracket rate. For most income levels between €40,000–€80,000, Belgian and Dutch net pay are comparable, though the Netherlands has been reducing rates recently while Belgium's top rate remains at 50%.