Asked about Belgian payroll processing, employee salary calculations, précompte professionnel (professional withholding tax), ONSS/RSZ social security contributions, employer cost calculations, net-to-gross or gross-to-net conversions, Belgian payslip structure, DmfA declarations, or any question…
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This Guide is general tax/accounting reference material for AI-assisted workflows. It has not been reviewed for your personal facts, documents, elections, deadlines, residency, filing status, or local procedures. Do not rely on it to file, pay, amend, or take a tax position without review by a qualified professional in the relevant jurisdiction.
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Income tax bracket — 25% rate
25% on taxable income EUR 0 – 16,720Income Tax Code 1992 (CIR/WIB 92)
Income tax bracket — 40% rate
40% on taxable income EUR 16,721 – 29,510Income Tax Code 1992 (CIR/WIB 92)
Income tax bracket — 45% rate
45% on taxable income EUR 29,511 – 51,070Income Tax Code 1992 (CIR/WIB 92)
Income tax bracket — 50% rate
50% on taxable income EUR 51,071+Income Tax Code 1992 (CIR/WIB 92)
Tax-free allowance (quotité exemptée / belastingvrije som) — base
EUR 10,570Income Tax Code 1992 (CIR/WIB 92); Annex III of AR/CIR 92
Employee ONSS/RSZ contribution rate
13.07% of gross salary (no cap)Social Security Act (Law of 27 June 1969)
Employer ONSS basic rate
~25.00%Social Security Act (Law of 27 June 1969)
Employer ONSS special contributions rate (sector-dependent)
~2–3%Social Security Act (Law of 27 June 1969)
Total employer ONSS rate (varies by sector/joint committee)
~27–28%Social Security Act (Law of 27 June 1969)
Employer ONSS basic contribution cap per employee per quarter (from 1 July 2025)
EUR 85,000 gross per quarter per employeeSocial Security Act (Law of 27 June 1969)
Employer ONSS cap indexation trigger
2% each time health index increases by 2%Social Security Act (Law of 27 June 1969)
Special social security contribution (employee) — monthly range
EUR 9.30 – 60.94/month (based on family income)Social Security Act (Law of 27 June 1969)
Special social security contribution (employee) — annual maximum
Max EUR 731.28/yearSocial Security Act (Law of 27 June 1969)
Work bonus (werkbonus) — gross salary threshold
Monthly gross salary below approximately EUR 2,900Social Security Act (Law of 27 June 1969); AR of 17 January 2000 (werkbonus)
Work bonus (werkbonus) — maximum monthly reduction on employee ONSS
~EUR 280/month (decreasing as salary increases)Social Security Act (Law of 27 June 1969); AR of 17 January 2000 (werkbonus)
Withholding tax reduction — 1st dependent child
EUR 48/monthAnnex III of AR/CIR 92
Withholding tax reduction — 2nd dependent child
EUR 133/monthAnnex III of AR/CIR 92
Withholding tax reduction — 3rd and subsequent dependent children (each)
EUR 299/month eachAnnex III of AR/CIR 92
Withholding tax reduction — disabled dependent
Additional EUR 48/monthAnnex III of AR/CIR 92
Double holiday pay — upper portion withholding rate
85% rate for withholdingAnnex III of AR/CIR 92
GGMMI/RMMMG — monthly gross (full-time, 18+) until 31 March 2026
EUR 2,154.81/monthCAO nr. 43 (National Labour Council / NAR/CNT)
GGMMI/RMMMG — monthly gross (full-time, 18+) from 1 April 2026
EUR 2,189.81/monthCAO nr. 43 (National Labour Council / NAR/CNT)
Standard working week
38 hoursEmployment Contracts Act (3 July 1978); Law of 16 March 1971 on Labour
Maximum daily working hours (standard)
9 hours (extendable to 11 in certain sectors)Law of 16 March 1971 on Labour
Overtime premium — first 2 hours
50% supplementLaw of 16 March 1971 on Labour
Overtime premium — Sundays and public holidays
100% supplementLaw of 16 March 1971 on Labour
Voluntary overtime (no reason required) — annual limit
Up to 120 hours/year (extendable to 360)Law of 16 March 1971 on Labour
Internal overtime limit before mandatory rest
143 hours above normalLaw of 16 March 1971 on Labour
Annual statutory holiday entitlement
20 days (based on prior year's work)Royal Decree of 30 March 1967 (Annual Holidays Act)
Double holiday pay rate
92% of gross monthly salary (paid in May/June)Royal Decree of 30 March 1967 (Annual Holidays Act)
Guaranteed salary during illness — white-collar
30 days at full payEmployment Contracts Act (3 July 1978)
Guaranteed salary during illness — blue-collar (days at full/reduced pay)
7/7/14 daysEmployment Contracts Act (3 July 1978)
Meal voucher — maximum employer contribution per day worked
EUR 6.91/day workedIncome Tax Code 1992 (CIR/WIB 92); AR/CIR 92
Meal voucher — employee contribution (common arrangement)
EUR 1.09/dayIncome Tax Code 1992 (CIR/WIB 92); AR/CIR 92
Eco-cheques — maximum annual amount
Max EUR 250/yearCAO nr. 98 (National Labour Council / NAR/CNT)
Statutory public holidays per year
10 legal public holidaysLaw of 4 January 1974 on Public Holidays
Company car BIK — employer solidarity contribution minimum
Minimum EUR 31.34/month (CO2-based)Income Tax Code 1992 (CIR/WIB 92); Social Security Act (Law of 27 June 1969)
DmfA (quarterly social security declaration) — filing and payment deadline
Last day of month following end of quarterSocial Security Act (Law of 27 June 1969)
Précompte professionnel (withholding tax) — monthly payment deadline
15th of the following monthIncome Tax Code 1992 (CIR/WIB 92)
Dimona (employment start/end declaration) — deadline
Day of start/end of employmentLaw of 27 June 1969; Dimona Royal Decree
Fiche 281.10 (employment income) — annual filing deadline
28 February of following yearIncome Tax Code 1992 (CIR/WIB 92)
Fiche 281.20 (directors' income) — annual filing deadline
28 February of following yearIncome Tax Code 1992 (CIR/WIB 92)
Work accident declaration — deadline
Within 8 calendar daysLaw of 10 April 1971 on Work Accidents
Salary margin (loonmarge/marge salariale) for 2025–2026
0% (no collective salary increases beyond automatic indexation)Law of 26 July 1996 on Promotion of Employment and Safeguarding of Competitiveness (Wet Concurrentievermogen)
First hire (1st employee) — employer ONSS reduction
Full basic ONSS exemption for unlimited periodSocial Security Act (Law of 27 June 1969); Programmatic Law
Quick Reference
| Field | Value |
|---|---|
| Country | Belgium (Kingdom of Belgium) |
| Currency | EUR |
| Payroll frequency | Monthly (typically paid last working day of month) |
| Tax year | Calendar year (1 January -- 31 December) |
| Primary legislation | Income Tax Code 1992 (CIR/WIB 92); Social Security Act (Law of 27 June 1969); Employment Contracts Act (3 July 1978) |
| Tax authority | SPF Finances / FOD Financiën |
| Social security authority | ONSS (Office National de Sécurité Sociale) / RSZ (Rijksdienst voor Sociale Zekerheid) |
| Employee SS rate | 13.07% of gross salary (no cap) |
| Employer SS rate | ~25% basic + ~3% special contributions (total ~27-28%) |
| Employer SS cap | EUR 85,000/quarter (basic contributions only, from 1 July 2025) |
| Withholding tax | Précompte professionnel / Bedrijfsvoorheffing (progressive, per Annex III) |
| Minimum wage (GGMMI) | EUR 2,189.81/month (from 1 April 2026, 18+ full-time) |
| DmfA filing | Quarterly, due by end of month following quarter |
| Skill version | 1.0 |
Annual Income Tax Brackets
| Taxable Income (EUR) | Marginal Rate |
|---|---|
| 0 -- 16,720 | 25% |
| 16,721 -- 29,510 | 40% |
| 29,511 -- 51,070 | 45% |
| 51,071+ | 50% |
Key Withholding Rules
| Rule | Detail |
|---|---|
| Calculation base | Gross salary minus 13.07% ONSS = taxable base |
| Work bonus (werkbonus) | Reduces ONSS for low earners (gross < ~EUR 2,900/month) |
| Fiscal work bonus | Reduces withholding tax proportional to social work bonus |
| Holiday pay | Taxed separately at special withholding rates |
| 13th month / end-of-year premium | Taxed at exceptional rate (often higher marginal) |
| Double holiday pay | Upper portion taxed at 85% rate for withholding |
Withholding Reductions (2026)
| Reduction | Amount (2026) |
|---|---|
| Per dependent child (1st) | EUR 48/month reduction |
| Per dependent child (2nd) | EUR 133/month |
| Per dependent child (3rd+) | EUR 299/month each |
| Disabled dependent | Additional EUR 48/month |
Employee Deductions
| Contribution | Rate | Base | Cap |
|---|---|---|---|
| Personal ONSS/RSZ | 13.07% | Gross salary | No cap |
| Special social security contribution | EUR 9.30 -- 60.94/month | Based on family income | Max EUR 731.28/year |
Employer Contributions
| Contribution | Rate | Notes |
|---|---|---|
| Basic employer ONSS | ~25.00% | Funds pensions, healthcare, unemployment, etc. |
| Special contributions (Closure Fund, Asbestos, etc.) | ~2-3% | Sector-dependent |
| Total employer ONSS | ~27-28% | Varies by sector and joint committee (CP/PC) |
Employer Contribution Cap
| Parameter | Detail |
|---|---|
| Cap threshold | EUR 85,000 gross per quarter per employee |
| Scope | Basic employer contributions (~25%) only |
| Excluded from cap | Special contributions (~3%), employee contributions (13.07%) |
| Indexation | 2% each time health index increases by 2% |
| Part-time workers | Full EUR 85,000 threshold (not pro-rated) |
Target Group Reductions
| Target Group | Reduction |
|---|---|
| First hires (1st employee) | Full basic ONSS exemption for unlimited period |
| Young workers (< 26, low-qualified) | Significant quarterly reduction |
| Older workers (55+) | Quarterly reduction based on age bracket |
| Long-term unemployed | Quarterly reduction for 2+ years registered |
Minimum Wage Schedule
| Period | Monthly Gross (full-time, 18+) |
|---|---|
| Until 31 March 2026 | EUR 2,154.81 |
| From 1 April 2026 | EUR 2,189.81 |
Working Hours and Overtime
| Parameter | Standard |
|---|---|
| Standard working week | 38 hours |
| Maximum daily hours | 9 hours (extendable to 11 in certain sectors) |
| Overtime premium (first 2 hours) | 50% supplement |
| Overtime on Sundays/holidays | 100% supplement |
| Voluntary overtime (no reason) | Up to 120 hours/year (extendable to 360) |
| Internal overtime limit | 143 hours above normal before mandatory rest |
Mandatory Benefits
| Benefit | Detail |
|---|---|
| Annual holiday | 20 days (based on prior year's work) |
| Single holiday pay | Normal salary during vacation |
| Double holiday pay | 92% of gross monthly salary (paid in May/June) |
| 13th month / end-of-year premium | Sector-dependent (most CPs mandate it) |
| Guaranteed salary (illness) | 30 days at full pay (white-collar); 7/7/14 days (blue-collar) |
| Meal vouchers | Employer max EUR 6.91/day worked (common: EUR 8 total, EUR 1.09 employee) |
| Eco-cheques | Max EUR 250/year |
| Commuting allowance | Mandatory (amount depends on transport mode and CP) |
| Group insurance (2nd pillar pension) | Common via sector or company plan |
| Hospitalisation insurance | Widespread (not strictly mandatory but often via CP) |
Belgium has 10 legal public holidays. If a holiday falls on a weekend or rest day, it must be replaced by another paid day off.
Belgian employers MUST issue a payslip (fiche de paie / loonfiche) for each salary payment. Required elements:
Payslip Required Elements
| Element | Mandatory |
|---|---|
| Employer identification (name, address, ONSS number) | Yes |
| Employee identification (name, NISS/INSZ number) | Yes |
| Pay period | Yes |
| Gross salary | Yes |
| All salary components (base, premiums, overtime, BIK) | Yes |
| ONSS employee deduction (13.07%) | Yes |
| Work bonus (if applicable) | Yes |
| Taxable base (after ONSS) | Yes |
| Précompte professionnel withheld | Yes |
| Special social security contribution | Yes |
| Net salary | Yes |
| Employer contributions (information) | Recommended |
| Meal vouchers / eco-cheques (if applicable) | Yes |
| Holiday pay details (when paid) | Yes |
| Cumulative year-to-date figures | Recommended |
Annual Tax Documents
| Document | Deadline |
|---|---|
| Fiche 281.10 (employment income) | 28 February of following year |
| Fiche 281.20 (directors' income) | 28 February of following year |
Filing Obligations
| Filing | Frequency | Deadline | Authority |
|---|---|---|---|
| DmfA (quarterly social security declaration) | Quarterly | Last day of month after quarter end | ONSS/RSZ |
| Précompte professionnel (withholding tax) | Monthly | 15th of following month | SPF Finances |
| Dimona (employment start/end declaration) | Per event | Day of start/end of employment | ONSS/RSZ |
| Fiche 281.10/20 | Annual | 28 February | SPF Finances |
| Work accident declaration | Per event | Within 8 calendar days | Fedris |
DmfA Details
| Parameter | Detail |
|---|---|
| Content | Worker data, salary, working days, contributions per employee |
| Submission | Electronic via ONSS portal or batch file |
| Penalties | Flat-rate penalty + interest for late/incorrect filing |
| Payment | Same deadline as filing (end of month after quarter) |
| Correction | Modification DmfA possible within limitation period |
Key Annual Calendar
| Month | Obligation |
|---|---|
| January | DmfA Q4 prior year; monthly PP |
| February | Fiches 281.10/20 deadline |
| April | DmfA Q1 |
| May/June | Double holiday pay processing |
| July | DmfA Q2 |
| October | DmfA Q3 |
| December | 13th month / end-of-year premium processing |
Gross monthly salary: EUR 3,500.00
Employer cost: Gross salary: EUR 3,500.00
Gross monthly salary: EUR 2,189.81
Holiday Pay Calculation
| Component | Calculation |
|---|---|
| Single holiday pay | Normal salary for days taken |
| Double holiday pay | 92% of gross monthly salary for full year of service |
| Timing | Paid by employer (white-collar) typically in May/June |
| ONSS on double holiday | 13.07% on the full 92% amount |
| Withholding on double holiday | Higher exceptional rate on upper portion |
Interaction with Other Skills
| Skill | Interaction |
|---|---|
| belgium-bookkeeping | Payroll journal entries (620 accounts), accruals for holiday pay and 13th month |
| belgium-einvoice | No direct interaction (e-invoicing relates to B2B transactions, not payroll) |
| payroll-workflow-base | General payroll processing workflow; Belgium-specific overrides in this skill |
This skill and its outputs are provided for informational and computational purposes only and do not constitute tax, legal, or financial advice. Open Accountants and its contributors accept no liability for any errors, omissions, or outcomes arising from the use of this skill. All outputs must be reviewed and signed off by a qualified professional before filing or acting upon.
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Other Belgium computations in the OpenAccountants Tax Library.
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