Belgium Salary Calculator: Bruto Netto

What it does

In Belgium the employee pays 13.07% of the gross in social security (RSZ/ONSS), reduced for low wages by the work bonus. The employer then withholds the professional withholding tax, calculated with the official key formula of the Federal Public Service Finance, which takes into account your family situation and dependent children, and an advance on the special social security contribution. This calculator applies the rules valid from 1 November 2026.

How to use it

1. Type your gross monthly salary.
2. Choose your family situation and the number of dependent children.
3. See the social security, the work bonus, the withholding tax and the net per month and per year.

The arithmetic runs in your browser. Nothing you type is sent anywhere and nothing is stored, so you can use these with real numbers.

Frequently asked questions

How much is €3,500 gross net in Belgium?
For a single employee without children, €2,408.87 net a month: €457.45 of social security, €608.94 of withholding tax and €24.74 of special contribution.

What is the work bonus?
A reduction of social security for low wages, up to about €300 a month below €2,300 gross and nothing from €3,403.62. Part of it also lowers the withholding tax.

Why did the withholding tax change in November 2026?
The income tax reform of 15 July 2026 raised the tax-free amount and changed the child reductions, so the Federal Public Service Finance published a new key formula for salaries paid from 1 November 2026.

Is the withholding tax the final tax?
No. It is an advance: the final income tax, with the municipal surcharge, is settled in the tax assessment the following year, which can lead to a refund or a payment.

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FOD Financiën — Bedrijfsvoorheffing
RSZ/ONSS — Werkbonus en bijzondere bijdrage