Belgium self-employed tax calculator 2026
Estimate take-home income as a self-employed person (indépendant / zelfstandige) in Belgium for 2026. It deducts INASTI/RSVZ social contributions (about 20.5% on net income, with an annual minimum), which are tax-deductible, then federal income tax (IPP) at 25%–50% less the tax-free allowance, plus a representative 7% municipal surcharge. Enter your annual net profit.
| Net profit | €50,000.00 |
| Income tax (federal IPP) | -€11,109.00 |
| Municipal surcharge | -€777.63 |
| Social contributions (INASTI) | -€10,250.00 |
| Net income (take-home) | €27,863.37 |
Effective deduction rate 44.3 % · of which income tax 23.8 %
How this is calculated
- Compute INASTI/RSVZ social contributions on your net professional income: about 20.5% on income up to roughly €75,000, then 14.16% on the next band, subject to an annual minimum (~€3,670).
- INASTI contributions are fully tax-deductible, so subtract them from your income to get the taxable base.
- Apply federal income tax (IPP) at the same 25%–50% brackets as employees, less the tax-free allowance credit.
- Add the municipal surcharge (representative 7%). Net income = net profit − INASTI − federal tax − surcharge. Note that provisional INASTI is paid quarterly and regularised later against actual income.
FAQ
How are self-employed social contributions calculated?
INASTI/RSVZ contributions are charged on your net professional income at about 20.5% (a lower 14.16% band applies above ~€75,000, with a ceiling near €110,000), with a quarterly minimum. They are recalculated (regularised) two to three years later against your actual income for the year.
Are the self-employed figures exact?
The INASTI rates and thresholds here are sourced from a licensed social-insurance fund and marked provisional; the exact 2026 brackets should be confirmed against the official INASTI tables. The contribution is also charged here directly on the entered net income, a simplification of the statutory net-of-contributions base.
Do the self-employed use the 30% expenses deduction?
No — that lump-sum deduction is for employees. The self-employed deduct their actual documented business expenses (so the profit you enter should already be net of expenses), and separately deduct their INASTI contributions from the tax base.
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 →