Dependent children and net salary in Belgium
Having fiscally dependent children directly increases the worker's monthly net salary. SPF Finances publishes annually a progressive lump sum reducing the professional withholding tax based on the number of children. The more children in the family, the larger the reduction per child — the progression is not linear.
1. Conditions for a child to be dependent
A child is fiscally dependent if three conditions are met on January 1st of the tax year: they are part of the worker's household, they do not receive professional income above the annual cap (around €3,900 net taxable for a couple), and they are not married.
Student children remain dependents as long as they meet these conditions, sometimes up to 25 years old for certain higher education programs.
2. The progressive lump sum
The monthly lump-sum reduction is not the same per child: it increases by tiers. Indicatively (2024 indexed amounts):
• 1 child: ~€49 / month;
• 2 children: ~€130 / month;
• 3 children: ~€345 / month;
• 4 children: ~€660 / month;
• 5 children: ~€980 / month;
• 6 children: ~€1,295 / month.
Beyond that, each additional child adds about €315 of monthly reduction. Exact amounts are published in the official schedule.
3. Disabled dependent child
A dependent child fiscally recognized as disabled counts double for the progressive lump-sum. For example, a couple with one able-bodied child and one disabled child benefits from the lump sum for three children (1 + 2 × 1 = 3).
Recognition must result from a medical-social assessment (AVIQ, Iriscare, Kind en Gezin, etc.) on January 1st of the tax year.
4. Other dependents
Ascendants (parents, in-laws) and siblings sharing the household and not exceeding the income cap are also dependents. The lump sum per other dependent is more modest (~€49/month) and does not progress with the number.
A disabled dependent person opens an additional lump sum identical to that for the worker themselves being disabled.
5. Effect on annual net
The cumulative effect over a year is substantial: a couple with 3 dependent children sees their net increase by about €345 × 12 = €4,140 / year versus the same salary without children. For an average worker, that equals several weeks of work.
Important: the reduction is a uniform monthly lump sum, independent of salary — a high and a low income receive the same nominal reduction, making the relative effect more significant for lower wages.