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 / year€27,863.37from €50,000.00 gross

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 %

Dataset last reviewed 2026-07-18 · tax year 2026 · 22 documented values⚠️ Informational estimate, not tax advice. Payroll software may differ in edge cases. Verify with a professional.

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.

Sources and verification

Dataset last reviewed 2026-07-18 · tax year 2026 · 22 documented values

Rates and thresholds use official primary sources where available, reputable secondary sources when primary access is unavailable, and clearly labelled derived formulas. Each value retains its verification status.

8 sources

SPF Finances — IPP bracket 1 upper €16,720 (income year 2026)
SPF Finances — Standard professional-expenses deduction 30% of income net of ONSS
PayCalcEU editorial default, informed by SPF Finances' 2026 per-commune rate table (derived) — Representative default (7%): a round figure chosen within the 0%-9% range of commune-set surcharges, since SPF Finances' 2026 rate table lists all 565 communes individually and publishes no single national-average figure to source instead
ONSS/RSZ — Employee ONSS/RSZ 13.07% of gross (no ceiling)
INASTI/RSVZ — INASTI: 20,50% sur un revenu professionnel jusqu'a 75.024,54 euros
INASTI/RSVZ — INASTI, Cotisations 2026 — Independant en activite principale: 14,16% sur la partie du revenu professionnel reevalue... qui depasse 75.024,54 EUR sans exceder 110.562,42 EUR
Xerius (citing Code TVA) — Belgium VAT standard rate 21%
SPF Finances — Regime de la franchise de taxe pour les petites entreprises -- seuil de 25.000 euros (hors TVA)

⚠️ Informational estimate, not tax advice. Payroll software may differ in edge cases. Verify with a professional.

Belgium tax guides

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