Belgium net salary calculator 2026
Work out your take-home pay in Belgium for income year 2026. The calculator deducts employee ONSS/RSZ social security (13.07% of gross, no ceiling), the standard 30% professional-expenses deduction (capped at €6,070), then federal income tax (IPP/PB) at 25%/40%/45%/50% less the tax-free allowance, plus a municipal surcharge (a representative 7%). Single taxpayer, no dependants.
| Gross salary | €40,000.00 |
| Income tax (federal IPP) | -€6,177.80 |
| Municipal surcharge | -€432.45 |
| Social security (ONSS) | -€5,228.00 |
| Net pay (take-home) | €28,161.75 |
Effective deduction rate 29.6 % · of which income tax 16.5 %
How this is calculated
- Deduct employee social security (ONSS/RSZ) at 13.07% of gross salary — Belgium applies no earnings ceiling to employee contributions.
- Subtract the standard professional-expenses deduction: 30% of your income net of ONSS, capped at €6,070 for 2026 (the cap applies above roughly €23,300 gross).
- Apply federal income tax (IPP/PB) marginally: 25% up to €16,720, 40% to €29,510, 45% to €51,070, then 50% above, on the taxable income.
- Subtract the tax-free allowance credit — the tax that would fall on the exempt amount (€11,180 for a single person, at the lowest bracket rate = €2,795) is deducted from the federal tax.
- Add the municipal surcharge (opcentiemen / taxe communale additionnelle), a percentage of the federal tax set by each commune (0–9%; this calculator uses a representative 7%). Take-home pay = gross − ONSS − federal tax − surcharge.
FAQ
Why is the municipal surcharge only an estimate?
Every Belgian commune sets its own surcharge on the federal income tax, from 0% (a few communes) up to about 9%. The national average is around 7%, which this calculator uses as a default. Your exact figure depends on where you are domiciled on 1 January of the assessment year.
What is the professional-expenses deduction?
Employees automatically deduct a lump-sum for work expenses — 30% of income after ONSS, capped at €6,070 in 2026 — without needing receipts. If your real, documented expenses are higher, you can deduct those instead, but that is uncommon.
Is the werkbonus included?
No. The werkbonus (bonus à l'emploi) is a reduction of employee social contributions for lower wages, which increases net pay below roughly €3,300/month. This v1 calculator omits it, so for lower salaries your actual net may be slightly higher than shown.
How does the tax-free allowance work?
The first €11,180 of income (for a single person, 2026) is exempt. In practice the exemption is applied by computing the tax on that amount at the lowest bracket (€2,795) and subtracting it from your total federal tax — so it acts as a tax credit rather than reducing your taxable income directly.
Official sources
Data last verified 2026-07-18 · tax year 2026 · 21 sourced values
Every rate, threshold and formula is read from a versioned dataset of official primary sources — no numbers are hardcoded. Values without a published 2026 primary source are flagged, never guessed.
6 sources
- SPF Finances — IPP bracket 1 upper €16,720 (income year 2026)
- SPF Finances — Standard professional-expenses deduction 30% of income net of ONSS
- SPF Finances — Municipal surcharge rates 2026 (avg ~7%)
- ONSS/RSZ — Employee ONSS/RSZ 13.07% of gross (no ceiling)
- Xerius (INASTI fund) — INASTI self-employed tier 1 ceiling €75,024.54 (2026)
- Xerius (citing Code TVA) — Belgium VAT standard rate 21%
⚠️ Informational estimate, not tax advice. Payroll software may differ in edge cases. Verify with a professional.
Belgium tax guides
- How Income Tax Works in Belgium (2026): Brackets, Tax-Free Allowance and Municipal Surcharge →
- Social Security Contributions in Belgium (2026): ONSS Rate, Werkbonus and What It Funds →
- Self-Employed Taxes in Belgium (2026): INASTI Contributions, IPP and Quarterly Payments →
- How VAT Works in Belgium (2026): Three Rates, What They Cover and the Registration Threshold →
- Debt Relief & Personal Insolvency in Belgium (2026): How It Works →