fireplotThe full calculation, step by step
Most calculators give you one number and no explanation. Here is exactly how your figure above is built, in the order Belgian payroll applies it.
How your income fills the 2026 tax brackets
Belgian income tax is progressive. Only the slice of income inside each bracket is taxed at that bracket's rate. Here is how far your taxable income reaches.
Understanding a Belgian payslip
Social security comes first. 13.07% of your gross salary goes to social security before any tax is calculated. It funds healthcare, your state pension, unemployment insurance and family allowances. Your employer pays a further contribution of roughly 25% on top of your gross, which never appears on your payslip.
Then the professional expense deduction. Every employee automatically gets a standard deduction of 30% of income after social security, up to a yearly cap, without needing receipts. You can claim real expenses instead if they are higher.
Then progressive tax with a tax-free allowance. What remains is taxed in four brackets from 25% to 50%. The first 11,180 euros are effectively tax free: you receive a credit equal to the tax that would have been due on that amount.
Finally, your commune takes a percentage of the tax. The municipal surcharge is not a tax on income but a tax on your federal tax, between 0% and 9% depending on where you live. Moving one street over can genuinely change your net pay.
If you are searching in Dutch or French, this is the bruto netto calculator or calculateur brut net for Belgium, using the same official rates.
Accuracy and assumptions
Frequently asked questions
Why is the gap between gross and net so large in Belgium?
Belgium combines a 13.07% employee social security contribution with progressive tax that reaches 50% from about €51,000 of taxable income, plus a municipal surcharge. In return, social security covers healthcare, pensions, unemployment insurance and family allowances, and many employees receive strong non-cash benefits on top of salary.
What is the 13.92 months rule?
Most Belgian white-collar employees receive double holiday pay (about 92% of one month) and a 13th month bonus on top of 12 salaries. Annual packages are therefore often quoted as monthly gross times 13.92. The toggle above includes this in the annual figure.
What is the municipal tax exactly?
Each commune levies a surcharge on your federal income tax, typically between 0% and 9%, with a national average around 7%. A handful of communes charge 0%. Because it is a percentage of tax rather than income, its real cost is usually 1 to 2% of gross salary.
How much do you keep from a raise in Belgium?
At most professional salary levels, a raise lands in the 45% or 50% bracket. After social security and municipal tax, roughly 40 to 45 cents of each extra gross euro reaches your account. The calculator shows your exact number based on your salary.
Does this include the expat (impatriate) regime?
No. Belgium has a special regime for qualifying foreign hires that allows a tax-free cost reimbursement of up to 30% of salary on top of gross pay, subject to conditions. If you qualify, your net will be noticeably higher than the standard calculation shown here.
Which rates does this calculator use, and are they current?
It uses the official figures for income year 2026: tax brackets of €16,720, €29,510 and €51,070, a tax-free allowance of €11,180, and 13.07% employee social security. The professional expense cap is the indexed 2026 estimate. Rates are reviewed when Belgium publishes new index adjustments.
Now see what you would actually keep elsewhere
Fireplot compares your income after tax, social security, rent and living costs across 23 countries, using the same engine as this calculator, and shows the age you could reach financial independence in each one.
Compare your net across countries