Tax calculators

Belgium income tax calculator: calculate income tax due

Belgium income tax calculator
Estimate Belgian income tax (federal + municipal surcharge) with 2026 brackets, personal allowance, children, marital quotient, and common reductions.
Common scenarios
Basic inputs
Family situation
Advanced mode (optional)
Results
Estimated taxable income37.535,00 €
Gross federal tax13.002,75 €
Tax reduction from personal exemption2727,50 €
Other tax reductions (pension/donations/childcare/other)0,00 €
Net federal tax10.275,25 €
Municipal surcharge719,27 €
Total estimated income tax10.994,52 €
Formula
Step A — Determine taxable income: If you input net taxable income, taxable income = input. If estimating from gross salary (employee): social security = gross × 13.07%; standard professional expenses = min(gross × 30%, €5,930); taxable income = gross − social security − standard expenses. Step B — Gross federal tax: apply progressive 25%/40%/45%/50% brackets. Step C — Personal exemption: exemption amount = €10,910 + children increase + under-3 add-on (if no childcare claimed). Convert the exemption amount to a tax reduction using the exemption scale (25%/30%/40%/45%/50%). If non-resident without the 75% condition, exemption amount = 0. Net federal tax = max(0, gross federal tax − exemption reduction − other tax reductions). Step D — Municipal surcharge: municipal tax = net federal tax × municipal rate. Step E — Total tax and balance: total tax = net federal tax + municipal surcharge; balance = total tax − withholding paid (optional).
Gross-to-taxable estimate
Employee social security (13.07%)6535,00 €
Standard professional expenses (cap €5,930)5930,00 €
Estimated taxable income37.535,00 €
Estimate only. Official assessments can differ due to regional rules, specific income types, and rounding.

Examples

Example 1 — Typical taxed case (single employee)
Gross salary €50,000, resident, no children, municipal 7%, no other reductions → total estimated tax ≈ €10,994.52.
Example 2 — Married, one income, 2 kids (marital quotient)
Gross salary €60,000, resident, 2 children (1 under 3), marital quotient ON, municipal 6% → total estimated tax ≈ €7,415.87.
Quick summary: Estimate Belgian personal income tax (IPP) on your annual taxable professional income (salary/self-employment), including the municipal surcharge. Best for residents (and non-residents who qualify). You’ll need either net taxable income or your gross salary to estimate it. Verified / consulted: 29 Jan 2026. (Rules can vary by year and personal situation.) Belgium’s personal income tax (IPP) is progressive: higher slices of taxable income are taxed at higher rates. For income year 2025 (assessment year 2026), the brackets range from 25% to 50%, and most taxpayers also pay a municipal surcharge on top of the federal tax. A key feature is the personal tax allowance (tax-free amount). For assessment year 2026, the basic amount is €10,910, and it increases if you have dependent children or other dependents. Instead of simply subtracting this from income, Belgium generally converts it into a tax reduction calculated on the “lowest part” of income, using a dedicated scale. This calculator is designed for quick estimation using either your net taxable income or an employee-style estimate from gross salary. For a full official simulation, Belgium provides tools such as Tax-on-web/MyMinfin and an anonymous simulator (Taxcalc).

FAQs

Does this cover dividends, interest, or rental income?

No—many movable or special incomes can be taxed separately at fixed rates. This calculator targets professional income taxed progressively.

What income number should I enter if I have it?

Use your net taxable income shown on your assessment notice / Tax-on-web for the cleanest estimate.

If I only know my gross salary, is the result exact?

It’s an estimate: we subtract 13.07% employee social security and a standard expenses deduction (capped). Your payroll situation can differ.

What is the “personal tax allowance” (€10,910)?

It’s the basic tax-free amount for assessment year 2026; it reduces your tax via a tax-reduction mechanism.

How do children reduce my tax?

They increase your personal exemption amount (e.g., €5,110 for 2 children in assessment year 2026), which increases your tax reduction.

What about a child under 3 years old?

If you don’t claim childcare expenses for that child, the exemption can be increased by €740 per child under 3 (assessment year 2026).

What is the municipal tax and why does it change?

Your commune adds a percentage on top of your personal income tax; each commune sets its own rate.

I’m a non-resident—do I get the same allowances?

Often only if your Belgian professional income is at least 75% of your worldwide professional income.

What is the “marital quotient”?

In some couples, up to 30% of the higher earner’s taxable earned income can be attributed to the lower earner (cap €13,460 for assessment year 2026).

Why might my result differ from my assessment notice?

Belgian taxation can include extra steps: specific income taxed separately, regional tax reductions, detailed expense rules, withholding/prepayments, and official rounding.

Note: This calculator provides an estimate. Rates can vary by region and change over time. It is not tax advice.

See more in calculators for Belgium.

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