Note: This calculator uses the official 2025 (assessment year 2026) tax brackets from the Belgian tax authorities. The basic personal tax allowance is €10,900, with additional allowances for dependent children. The calculator includes the regular social security contribution (13.07%) and the special social contribution ("Cotisation sociale spéciale"). This is a simplified calculation and does not account for all deductions, special tax statuses, or other factors that might affect your actual tax liability.