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Belgium tax & financial deadlines

FOD Financiën and RSZ obligations: VAT, professional withholding tax, corporate tax and social security.

This information is provided for general planning and reference only. Tax obligations and deadlines can depend on taxpayer status, fiscal year, reporting period and other circumstances. Dates shown on Wait Until are indicative only and may be subject to change, extensions or jurisdiction-specific rules. Wait Until, its parents, subsidiaries and affiliates do not accept responsibility for any loss, penalty, interest, filing failure or other consequence arising from reliance on the information or any error or omission in the deadlines shown. Final confirmation of all applicable deadlines must be obtained from the relevant tax authority or a qualified tax adviser.

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Upcoming deadlines

Depends on your own dates or a set rule

These follow your financial year, reporting period, payment date or a business-day rule, so no single calendar date is shown.

  • Professional withholding tax return and payment (bedrijfsvoorheffing / précompte professionnel)

    File & pay

    By the date published for each month in FOD Financiën's bedrijfsvoorheffing calendar (around the 15th of the following month).

    Return and payment for each month by the date in FOD Financiën's withholding-tax calendar.

    Applies to: Employers and other debtors of professional withholding tax (monthly declarants)

    Authority: FOD Financiën / SPF FinancesFOD Financiën — Bedrijfsvoorheffing: kalenderLast checked Wednesday 7 October 2026

  • Corporate income tax return (Biztax)

    File
    Verification pending

    Statutory deadline: the last day of the seventh month after the financial year closes (next working day if that is a Saturday, Sunday or public holiday).

    Annual corporate income tax return.

    Applies to: Companies and other legal entities filing via Biztax

    The official Biztax deadlines page blocked automated access, so the rule could not be confirmed on the official page itself; pending.

    Authority: FOD Financiën / SPF FinancesFOD Financiën — Biztax: indieningstermijnen aangiftenLast checked Wednesday 7 October 2026