Belgian year-end bonus net pay 2026 : 13th month calculator
How much of your year-end bonus or 13th month actually lands in your account? Exceptional remuneration is taxed on a different scale than your ordinary salary. Free, instant calculation.
Parameters
Your usual salary excluding the bonus, it determines the withholding tax rate applied to the bonus.
Enter your normal salary and the bonus amount to see the estimated net.
Why a bonus's net pay differs from your salary
On your ordinary payslip, withholding tax follows a monthly scale that accounts for your usual reductions (work bonus, marital quotient…). A year-end bonus, gratification or bonus payment does not follow that scale: it's classified as an "exceptional allowance" and taxed on its own scale, often perceived as heavier, hence the recurring question: "why is my 13th month taxed so much?"
1. The rate depends on your NORMAL salary, not the bonus
This is the most commonly misunderstood point: the withholding rate applied to the bonus is determined by your normal annual salary (your usual salary × 12), not by the bonus amount itself. An employee on €3,000/month falls in the 46.44% bracket, regardless of the exact bonus amount.
2. Social security first, then withholding tax, just like an ordinary salary
The gross bonus first bears the personal social security contribution (13.07%), same as salary. The withholding rate determined in step 1 is then applied to the taxable remainder (gross bonus − social security).
3. 2026 scale, exceptional allowances
- 0% up to €10,675/year
- 23.22% from €10,675.01 to €13,660
- 25.23% from €13,660.01 to €17,375
- 30.28% from €17,375.01 to €20,840
- 35.33% from €20,840.01 to €23,580
- 38.36% from €23,580.01 to €26,340
- 40.38% from €26,340.01 to €31,830
- 43.41% from €31,830.01 to €34,640
- 46.44% from €34,640.01 to €45,860
- 51.48% from €45,860.01 to €59,900
- 53.50% above €59,900
4. Exemption or reduction for dependent children
If your normal annual salary stays below a threshold that rises with the number of dependent children, the bonus can be fully or partially exempt from withholding tax. Above that threshold but below a second, higher one, a percentage reduction applies instead (7.5% to 75% depending on the number of children, up to 5). This calculator automatically applies whichever rule is more favourable to your situation.
What this calculator does not cover
For accuracy, this tool is limited to the standard case of year-end bonuses, gratifications and bonus payments for a Belgian resident. It does not cover piece-rate/task-based bonuses (flat 16.15% rate), back pay, severance-in-lieu-of-notice or outplacement compensation, non-residents, or the special social security contribution due in the payment month. For double holiday pay, which follows a separate rate column of the same scale, use our dedicated tool. For your ordinary salary, see Gross → net salary.
Frequently asked questions
Why is my year-end bonus taxed differently from my salary?
Belgian withholding tax distinguishes ordinary monthly pay from "exceptional allowances" (year-end bonuses, gratifications, bonuses, holiday pay). These follow a dedicated scale (Annex III to the Belgian income tax code implementing decree, points 53-55): the withholding rate is determined by your NORMAL annual salary, then applied to the bonus amount itself.
What withholding tax rate applies to a year-end bonus?
It depends on your normal annual salary: from 0% (below €10,675/year) up to 53.50% (above €59,900/year), in progressive brackets. An employee earning around €3,000/month gross typically falls in the 46.44% bracket.
Is the bonus also subject to social security?
Yes: like any professional income, the year-end bonus first bears the 13.07% personal social security contribution, before withholding tax is calculated on the taxable remainder.
Is there an exemption for dependent children?
Yes. If your normal annual salary stays below a threshold that rises with the number of dependent children (e.g. €18,858 for 1 child, €22,470 for 2), the bonus benefits from a full or partial withholding tax exemption. Above that threshold but below a second, higher one, a percentage reduction applies instead (7.5% to 75% depending on the number of children, up to 5).
Does the calculation cover every situation?
No. This tool covers the standard case: "other exceptional allowances" (year-end bonuses, gratifications, bonuses) for a Belgian resident. It does not cover piece-rate/task-based bonuses (flat 16.15% rate), back pay, severance-in-lieu-of-notice or outplacement compensation, non-residents, or the special social security contribution due in the payment month.
Am I entitled to a year-end bonus?
There is no general legal right: it depends on your sector's collective agreement (joint committee), a company-level agreement, or an established practice at your employer. This tool assumes the gross bonus amount is already known and only estimates what remains after contributions and tax.
Is this the same as double holiday pay?
No. Holiday pay follows a separate rate column of the same scale (generally more favourable than "other exceptional allowances"). Use our dedicated "Holiday pay (double)" tool to estimate its gross amount.
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