Belgian payroll is among the most complex in Europe. We coordinate salary processing, social security declarations, DIMONA filings, and employment law compliance through licensed social secretariats.
Belgian payroll involves complex salary calculations, social security contributions, tax withholding, and strict employment law compliance. As part of our accounting services in Belgium, LawSupport coordinates payroll setup and ongoing processing through licensed Belgian social secretariats — ensuring your company is fully compliant from the first hire.
What Belgian Payroll Covers
Gross-to-net salary calculation — applying correct tax brackets, deductions, and social security rates
Social security (ONSS/RSZ) — employer (~25–27%) and employee (~13.07%) contributions
Tax withholding — bedrijfsvoorheffing/précompte professionnel (personal income tax advance)
DIMONA declarations — real-time hire/termination reporting to ONSS/RSZ
DmfA filings — quarterly multifunctional social security declarations
Pay slips — compliant loonfiche/fiche de paie generation
Holiday pay — single and double holiday pay calculation (Belgian-specific system)
13th month salary — end-of-year premium per sectoral agreements
Year-end tax fiches — 281.10 fiches for each employee, filed with the SPF Finances
Belgian Payroll Cost Structure
Belgian employment costs are among the highest in Europe. Here is a typical breakdown for a white-collar employee earning €4,000 gross/month:
Belgian employment law is heavily influenced by joint committees (paritaire comités/comités paritaires) — sector-specific bodies that set minimum wages, working conditions, and benefits. Every Belgian company is classified under one or more joint committees based on its primary activity.
Key elements determined by joint committees:
Minimum salary scales (barema's/barèmes)
13th month salary entitlement and calculation
Meal voucher amounts
Working time arrangements (38-hour week is standard)
Notice periods for dismissal
Training obligations
Common joint committees for international companies: PC 200/CP 200 (auxiliary joint committee for white-collar workers — the default for many service companies), PC 226 (international trade), and PC 218 (ANPCB — national auxiliary committee).
Key Employer Obligations
Obligation
Frequency
To Whom
DIMONA declaration
Each hire/termination
ONSS/RSZ
Social security contributions
Quarterly
ONSS/RSZ
DmfA filing
Quarterly
ONSS/RSZ
Tax withholding payment
Monthly/quarterly
SPF Finances
Pay slips
Monthly
Employees
Year-end fiches (281.10)
Annual (Feb/March)
SPF Finances + employees
Holiday pay
Annual (May/June)
Employees (or via holiday fund)
Work regulations
At hire (+ updates)
Employees
Social Secretariat — Why You Need One
Belgian law does not require using a social secretariat, but the complexity of Belgian payroll makes it virtually essential. Licensed social secretariats (erkend sociaal secretariaat/secrétariat social agréé) handle:
All salary calculations and pay slip generation
DIMONA and DmfA declarations
Tax withholding calculations and payments
Holiday pay and 13th month calculations
Employment contract templates (compliant with applicable joint committee)
Dismissal calculations (notice period, severance)
HR advisory and legal updates
LawSupport coordinates with leading Belgian social secretariats (SD Worx, Securex, Acerta, Partena, Liantis) to set up your payroll and manage it in English.
Belgian payroll processing includes: gross-to-net salary calculation, personal income tax withholding (bedrijfsvoorheffing/précompte professionnel), employer and employee social security contributions (ONSS/RSZ), DIMONA declarations, monthly/quarterly DmfA filings, pay slip generation, year-end tax fiches (281.10), holiday pay calculation, and 13th month salary processing.
Employer social security contributions (ONSS/RSZ patronale bijdragen) are approximately 25-27% of gross salary for most private-sector employees. Employee contributions are approximately 13.07% of gross salary. Combined, the social security burden is approximately 38-40% on top of the gross salary.
DIMONA (Déclaration Immédiate / Onmiddellijke Aangifte) is the mandatory real-time employment declaration system. Employers must declare every new hire (DIMONA IN) and every termination (DIMONA OUT) to the ONSS/RSZ before the employee starts or on the day of departure. Failure to declare carries fines.
A 13th month salary (eindejaarspremie/prime de fin d'année) is not legally mandatory by law, but it is required by most sectoral collective bargaining agreements (CAOs/CCTs). In practice, the vast majority of Belgian employees receive a 13th month payment, typically paid in December.
Belgium has a unique dual holiday pay system. Single holiday pay is the normal salary during vacation days. Double holiday pay is an additional premium (typically 92% of one month's salary for white-collar workers) paid once a year, usually in May or June. Blue-collar workers receive holiday pay through a holiday fund.
Yes, and it is strongly recommended. Belgian payroll is among the most complex in Europe due to joint committees (paritaire comités), multiple tax brackets, regional variations, and frequent legislative changes. Most Belgian companies use a licensed social secretariat (sociaal secretariaat/secrétariat social) for payroll processing.
A social secretariat (sociaal secretariaat/secrétariat social agréé) is a licensed Belgian payroll provider authorised to handle salary calculations, social security declarations, and tax withholding on behalf of employers. Major providers include SD Worx, Securex, Acerta, Partena, and Liantis.
Payroll processing costs typically range from €25–€50 per employee per month through a social secretariat for basic payroll. Additional services (HR advisory, employment contracts, dismissal calculations) are charged separately. LawSupport coordinates payroll setup and ongoing processing with licensed providers.
Set Up Belgian Payroll the Right Way
We coordinate with licensed social secretariats to get your payroll running — fully compliant, fully in English.
