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Belgium Business Expenses Guide

deductible business expenses in Belgium — the general rule: expenses are deductible if they are "beroepsmatig" / "professionnel" (incurred for the purpose of the business or profession), are supported by adequate documentation, and are not explicitly excluded by the Belgian Income Tax Code. The guide covers: the general deductibility criteria (Article 49 WIB/92 — the "beroepskosten" / "frais professionnels" — expenses must be incurred in the tax period, be made with a view to acquiring or retaining taxable income, and be at arm's length), the specific expense categories (car expenses — the CO2-based deductibility from 50–100% depending on emissions, with the "sloopregeling" phasing out ICE car deductibility to 0% by 2028; business meals — 69% deductible for client meals, 50% for internal staff meals; gifts and hospitality — the €50 per person per year limit for gifts to clients, fully deductible for hospitality costs; home office expenses — the €1,000 flat-rate home office deduction for employees in 2024–2025; the C3 certificate for foreign business travel — the private mileage deduction of €0.15/km), the fixed professional expense allowance (the forfaitaire beroepskosten / frais forfaitaires professionnels — the automatic deduction of 30% of net professional income for employees, capped at €7,770 in 2026), and the non-deductible expenses (the "niet-aftrekbare kosten" / "frais non déductibles" — the secret commission rule, the 50% limit on client entertainment, the non-deductible VAT, the fines and penalties, the corporate tax itself).

Correctly categorising and documenting business expenses is essential for maximising deductions and withstanding a tax audit. All amounts in Euros (EUR). For related reading, see our Corporate Tax Guide →, Starting a Business Guide →, and Payroll Tax Guide →.

General Deductibility Criteria

  • Article 49 WIB/92 — the four conditions: An expense is deductible as a business expense (beroepskost / frais professionnel) if it meets all four conditions: (a) the expense is incurred in the tax period (the "belastbaar tijdperk" / "période imposable" — the calendar year for individuals, the financial year for companies), (b) the expense is made with a view to acquiring or retaining taxable income (the "beroepsdoel" / "but professionnel" — the business purpose test), (c) the expense is at arm's length (the "normaal" / "normal" — the amount must be reasonable compared to what an independent third party would charge), (d) the expense is supported by adequate documentation (the "bewijsstukken" / "pièces justificatives" — invoices, receipts, contracts, and proof of payment). The documentation must be retained for 7 years after the tax year.
  • Mixed-use expenses (gemengde kosten / frais mixtes): Expenses that serve both a business and a personal purpose (mixed-use expenses — such as a home office, a car used for both business and personal purposes, a mobile phone) are deductible only to the extent of the business-use proportion. The taxpayer must document the business-use percentage (e.g., a logbook for the car — the "rittenadministratie" / "relevé kilométrique"; a square-metre calculation for the home office). If no logbook is kept, the FOD Financiën / SPF Finances may apply a flat-rate business-use percentage (typically 50% for a car, 25% for home office).

Specific Expense Categories

  • Car expenses: The deductibility of car expenses (the "autokosten" / "frais de voiture") is determined by the vehicle's CO2 emissions under the "sloopregeling" (the degressive deductibility regime). In 2025–2026: (a) electric vehicles (BEVs) — 100% deductible, (b) petrol vehicles — 50% deductible, (c) diesel vehicles — 37.5% deductible. The deduction applies to: the lease or financing cost, the depreciation, the fuel, the insurance, the maintenance, and the parking. The deduction does NOT apply to tolls and parking (100% deductible regardless of CO2).
  • Business meals and entertainment: Client meals and entertainment (the "relatiekosten" / "frais de relation") are 69% deductible (the limit applies to the total cost of the meal, including the food, drinks, and service). Internal staff meals (the "personeelskosten" / "frais de personnel" — meals provided to employees in the company canteen) are 50% deductible. Gifts to clients (the "geschenken" / "cadeaux d'affaires") are deductible up to €50 per person per year (the limit applies to the total value of gifts given to a single client in a calendar year). Hospitality (the "ontvangstkosten" / "frais de réception" — events, receptions) is 100% deductible if directly related to the business.
  • Home office expenses (thuiswerk / télétravail): For employees working from home (the structural telework — "structureel thuiswerk" / "télétravail structurel"), the employer can pay a tax-free home office allowance of €154.75 per month (the 2025–2026 rate per the CCT 149 / CCT 149 — the sectoral collective bargaining agreement). The allowance covers the employee's home office costs (electricity, heating, internet, office supplies). For self-employed individuals (zelfstandigen / indépendants), the home office expenses can be deducted based on: (a) a flat rate (the "forfait" — approximately 25% of total housing costs, limited to the actual business-use area), or (b) actual costs (the "werkelijk" / "réel" — proportion of rent/mortgage interest, electricity, heating, internet, cleaning allocated to the home office).
  • C3 certificate — foreign business travel: For business trips abroad using a private car, the taxpayer can deduct €0.15 per kilometre (the "C3-certificaat" / "certificat C3" rate for 2026). The C3 rate is updated annually by the FOD Financiën / SPF Finances. The deduction requires a C3 certificate — a form issued by the employer or the tax authorities confirming the business purpose of the trip. The certificate must be retained with the tax records. The C3 rate is not intended to cover the actual cost but is a flat-rate reimbursement for business travel.

Fixed Professional Expense Allowance (Forfaitaire Beroepskosten / Frais Forfaitaires)

  • Employees: Instead of deducting actual business expenses, an employee can choose the fixed professional expense allowance (the "forfait" / "forfaitaire aftrek" / "déduction forfaitaire"). The fixed deduction is: (a) 30% of net professional income (gross salary minus social security contributions), (b) capped at €7,770 (2026 — indexed annually). The fixed deduction takes into account all employee expenses — commuting, home office, work clothing, professional subscriptions, etc. — without needing to document individual expenses. If the employee's actual expenses exceed the fixed deduction, the employee can choose to deduct actual expenses (the "werkelijke kosten" / "frais réels") instead — but must document each expense individually.
  • Self-employed: Self-employed individuals (zelfstandigen / indépendants) have a similar fixed deduction: (a) 25% of professional income (after deducting social security contributions), (b) capped at €7,770 (2026). The self-employed can also choose actual expenses. The fixed deduction is calculated automatically by the tax authorities and applied to the tax return — the taxpayer does not need to request it. The fixed deduction is particularly beneficial for self-employed individuals with low actual expenses.

Non-Deductible Expenses

  • Explicitly non-deductible: The Belgian Income Tax Code explicitly denies the deduction of: (a) 50% of client entertainment expenses (the remaining 50% is deductible — the "50%-regel" / "règle des 50%"), (b) secret commissions (Article 57 WIB/92 — payments to unidentified non-resident recipients — see the Transfer Pricing Guide), (c) fines and penalties (boetes / amendes — traffic fines, tax penalties, criminal fines — these are never deductible), (d) non-deductible VAT (the VAT that cannot be recovered — e.g., VAT on entertainment expenses, VAT on cars — is also not deductible as a business expense), (e) the corporate income tax itself (the "vennootschapsbelasting" / "impôt des sociétés" is not a deductible expense).

For the full corporate tax framework and the calculation of taxable profit, see our Corporate Tax Guide →. For the payroll and employment expense rules, see our Payroll Tax Guide →. For the VAT deductibility rules, see our VAT/BTW Guide →.