Belgium Personal Tax Guide

Progressive Tax Brackets (2026)

• Federal tax brackets: Taxable income (net belastbaar inkomen / revenu net imposable) after the professional expense deduction is taxed at four progressive federal rates: (a) 25% on the first bracket (€0–€15,820), (b) 40% on €15,820–€27,920, (c) 45% on €27,920–€46,440, (d) 50% on everything above €46,440. These brackets are indexed annually to the cost of living (health index).
• Regional surcharges (opcentiemen / centimes additionnels): The three regions add a percentage of the federal tax as their own income tax: Flanders (Vlaanderen): 24.25% of the federal tax (the "Vlaamse belasting"). Wallonia (Wallonie): 7.75% of the federal tax (the "additionnel wallon"). Brussels-Capital Region: 7.00% of the federal tax (the "additionnel bruxellois"). The effective top marginal rate including regional surcharges is approximately 62.1% (50% × 1.2425) for Flanders, 53.9% for Wallonia, and 53.5% for Brussels. The regional rate is applied to the federal tax, not to your income directly — so a 24.25% surcharge on a 50% bracket means 12.125 percentage points extra.
• Municipal surcharge (gemeentebelasting / taxe communale): Individual municipalities add a surcharge of 0–9% of the federal tax (the average is approximately 7.2%). The municipal surcharge is determined by the municipality where the taxpayer resides on 1 January of the tax year. This further increases the effective rate — in a municipality with a 7% surcharge, the municipal component adds approximately 3.5 percentage points at the top bracket.

Tax-Free Threshold (Belastingvrije Som)

• Base threshold: Every taxpayer receives a tax-free allowance (belastingvrije som / quotité exemptée d'impôt) of approximately €10,160 (2026, indexed). This means the first €10,160 of taxable income is effectively taxed at 0%. The threshold is deducted from taxable income before the brackets apply.
• Increased threshold for children: The threshold increases by approximately: (a) €1,740 for one child, (b) €4,400 for two children, (c) €8,990 for three children, (d) €13,580 for four children, plus €4,590 for each additional child. These amounts are indexed annually. The increase is granted for children under 18 (or under 25 if in full-time education). Disabled children receive a doubling of the increase.
• Other threshold increases: Additional increases apply for: (a) disabled taxpayers (approximately €1,740), (b) surviving spouses (€1,740), (c) single parents (€1,740), (d) taxpayers with dependent disabled family members (€1,740 each). The increases are cumulative up to a maximum of approximately €12,000 total.

Work Bonus (Werkbonus)

• Mechanism: The work bonus (werkbonus / bonus à l'emploi) is a reduction of personal income tax for low-to-middle-income earners. It is calculated as a percentage of gross employment income and phased out as income rises. For 2026, the maximum bonus is approximately €2,400 for gross employment income up to approximately €25,000. The bonus phases out gradually and falls to zero at gross income of approximately €65,000.
• Application: The work bonus is automatically applied by the employer through the payroll withholding (bedrijfsvoorheffing / précompte professionnel). The employee does not need to apply separately. If the employer did not apply it correctly, the employee can claim it on the annual tax return.

Professional Expense Deduction (Beroepskosten)

• Two methods: Employees can deduct professional expenses (beroepskosten / frais professionnels) either as actual expenses (with receipts and documentation) or as a fixed flat rate (forfait / montant forfaitaire).
• Fixed rate (forfait): The flat-rate deduction is 30% of gross employment income, capped at €5,480 (2026, indexed). For incomes below approximately €18,260, the 30% deduction is uncapped (the deduction equals 30% of income with no maximum). The flat rate covers all work-related expenses (commuting, home office, tools, professional clothing, etc.). No receipts are required. The flat rate is automatically applied by the tax authorities — the taxpayer must opt out if they prefer actual expenses.
• Actual expenses: If actual professional expenses exceed the flat-rate cap, the taxpayer can deduct the higher amount, provided full supporting documentation (receipts, invoices, mileage log) is maintained. Common actual expenses include: commuting costs (public transport or €0.15/km for car), home office (a portion of rent, utilities, internet), professional development (courses, conferences), IT equipment, professional subscriptions, and work clothing. The tax authorities frequently audit actual expense claims — rigorous documentation is essential.

Tax Credits and Deductions

• Children and dependents: In addition to the increased tax-free threshold (above), taxpayers with children receive: (a) the "kinderbijslag" (child benefit) from the Flemish/Walloon/Brussels family benefit agency — approximately €195/month per child (varies by region and age), (b) a tax credit for childcare costs (kinderopvang / frais de garde) — 45% of actual childcare costs up to €15/day per child, with a maximum of approximately €960 per child per year, (c) the "schoolbonus" for secondary and higher education costs (up to approximately €300 per child).
• Energy renovation credits: Belgium offers generous tax credits for energy-saving home improvements ("energielening" and "woonbonus" — though the form varies by region). In Flanders: the "Mijn VerbouwPremie" (renovation premium) and "Mijn VerbouwLening" (0% loan) for energy renovation. In Wallonia: "Rénov'Ex" and "Habitations Mères" premiums. In Brussels: "Rénolution" premiums. These are regional, not federal, and amounts vary. Typical credits: 25–40% of renovation costs for insulation, heat pumps, solar panels, and high-efficiency glazing, up to €10,000–€20,000 per project.
• Home security credit: A tax credit of 30% (up to €1,270 per year) is available for the installation of home security systems (alarms, cameras, sensors) by recognised installers. The system must meet specific technical standards (NBN EN 50131).
• Long-term savings (pension savings): Contributions to a Belgian "pensioensparen" (third-pillar pension) scheme are deductible: (a) 30% rate on contributions up to €1,270 (for the "old regime" — 30% deduction on contributions), (b) or 25% rate on contributions up to €3,420 (for the "new regime" — 25% deduction). The 25% regime is generally more advantageous for higher earners. The pension savings product must be a qualifying Belgian pension savings fund or insurance contract (tak 21, tak 23, pensioenspaarfonds).
• Cycling allowance (fietsvergoeding): Employers can provide a tax-free cycling allowance of up to €0.35/km (2026) for commuting by bicycle. The allowance is exempt from personal income tax and social security.

Filing and Payment

• Filing deadline: The personal tax return (Personenbelastingaangifte / Déclaration IPP) must be filed annually. Deadlines: 30 June for paper returns (increasingly rare), 15 July for online returns via Tax-on-Web (Tax-on-Web / MyMinfin), and 15 October for returns filed through a recognised tax intermediary (accountant or tax lawyer). The tax year is the income year (e.g., 2025 income is declared in 2026 — "aanslagjaar 2026").
• Pre-filled returns: The tax authorities provide a pre-populated return (the "vooringevulde aangifte" / déclaration préremplie) based on data from employers, banks, insurers, and pension funds. The taxpayer must verify the data and add any missing information (foreign income, deductions, credits). The pre-filled return is available online from early May.
• Joint filing: Spouses and legally cohabiting partners must file a joint return (gezamenlijke aangifte / déclaration commune). Each partner reports their own income on the same return. The tax is calculated separately for each partner (individual taxation within the joint return — the "huwelijksquotiënt" / quotient conjugal allows a limited transfer of income from the lower-earning to the higher-earning spouse).
• Payment: Tax is due within 2 months of the assessment notice (aanslagbiljet / avis d'imposition). The notice is typically issued between June and October of the year following the tax year. Voorafbetalingen (prepayments) can be made to avoid interest — recommended if you have significant non-withheld income (freelance, rental, foreign income). Insufficient prepayment attracts a penalty of 2.25% on the tax due (for personal income tax, the penalty on insufficient voorafbetalingen is 2.25% of the shortfall, versus 6.75% for corporate tax).

Taxation of Specific Income Types

• Employment income: Fully taxed at progressive rates (25–50%), subject to payroll withholding by employer (bedrijfsvoorheffing). Includes salary, bonuses, commissions, fringe benefits (company car, meal vouchers, group insurance, hospitalisation insurance).
• Director fees (bestuurdersbezoldiging / tantièmes): Directors of Belgian companies are taxed as employment income (at progressive rates), not as independent contractors. The company must withhold payroll tax (bedrijfsvoorheffing) on director fees. The minimum director salary requirement (€45,000 for SME reduced rate eligibility) is a common planning point.
• Rental income: Non-furnished rental income from Belgian property is taxed on the indexed cadastral income (KI/RC) plus a 40% flat deduction — so only 60% of the KI is taxed at progressive rates. Actual rent received is not directly taxed. Furnished rental income: the actual rent is taxed (minus expenses) at progressive rates. Foreign rental income: generally taxable in Belgium (with foreign tax credit if treaty allocates taxing rights to the source country).
• Investment income (dividends, interest): Most investment income is subject to a final 30% withholding tax (roerende voorheffing / précompte mobilier). If the withholding tax has been correctly applied, the income does NOT need to be reported on the personal tax return (for most taxpayers). The first €1,020 (€2,040 for couples) of savings account interest is exempt. See our Investment and Securities Guide.
• Capital gains: Capital gains on shares and securities are generally tax-free if realised in the course of "normal management" (normaal beheer / gestion normale) of a private portfolio. Speculative gains (holding period <6 months or >1 year under certain conditions) may be taxed at 33% (plus municipal surcharge). Gains on real estate: exempt for own home; 16.5% (Vlaanderen) on speculative gains within 5 years; 33% for professional/speculative real estate trading.

For related reading, see our Corporate Tax Guide →, VAT/BTW Guide →, Property Tax Guide →, and Cross-Border Tax Guide →.