Payroll - Belgium
Payroll Services in Belgium
Become a compliant Belgian employer, with an accredited social secretariat coordinated on your behalf and one point of contact for everything that follows.
- ONSS identification plus an accredited secretariat, coordinated
- About 25% of gross in employer contributions (two ONSS-published components, added)
- Joint committee fixed before your first hire
Do You Need to Set Up Payroll in Belgium?
A foreign company hiring its first person in Belgium, weighing an employer-of-record platform against opening a payroll, or replacing a provider that turns out not to be accredited: this page covers the decision and the act, becoming an ONSS-identified employer and running the cycle that follows.
A KBO/BCE number has to exist before any of this starts; the ONSS will not open an employer file without one. Still working that out? See Company Registration Belgium: VAT Registration in Belgium. Once the company exists, everything from the joint committee to your first Dimona sits on this page.
What's Included
-
Becoming a Belgian Employer
Determine the competent joint committee, draft and file the compulsory work rules, and identify your company with the ONSS through WIDE, form ID122w.
-
Appointing Your Mandatary
A written mandate plus a procuration, notified to the ONSS, so an accredited social secretariat, not us, calculates and files your gross pay, withholding and DmfA return.
-
Running the Recurring Cycle
Dimona IN and OUT, the quarterly DmfA, the four annual contribution dates, and the annual holiday cycle, with us as your single point of contact throughout.
-
Accident Insurance and Social Documents
Compulsory occupational accident cover arranged before your first worker's first day, plus the personnel register and individual accounts kept current from day one.
-
The Two Alternatives, Weighed Honestly
Case-by-case advice on an employer-of-record platform or a self-employed contractor, and the Belgian rule that makes each riskier than the marketing for it suggests.
We are not an accredited social secretariat and we never use that name: only a body accredited by the Minister of Social Affairs may collect the contributions due. We do not hold or collect a client's ONSS contributions ourselves, and we do not give tax or accounting advice, which is reserved to ITAA members. No price for this service appears on this page.
Already own a ready made bv belgium rather than a new one? It still has to become an employer from its very first hire, the same sequence as any other Belgian company.
Before Your First Employee: The Setup Sequence
- Have the KBO/BCE number in place. The ONSS will not open an employer file without one; this step belongs to formation and is covered there, not repeated here.
- Determine the competent joint committee. Fixed by your real activity; a group with several activities split across separate entities can fall under more than one committee.
- Draft and file the work rules. Compulsory whatever your headcount, filed with the regional Controle des lois sociales or online, within 8 days of entry into force.
- Identify as an employer with the ONSS. Filed through WIDE, form ID122w; a provisional number in the form 51.xxx.xxx-xx issues immediately and is usable straight away for the Dimona.
- Appoint your mandatary. A written mandate plus a procuration, notified to the ONSS in the same submission, so your accredited social secretariat can calculate and file on your behalf.
- Take out occupational accident insurance. Must be in force on your first worker's first day, with no retroactive cover, and the insurer enters your ONSS number in the Fedris register.
- Arrange prevention and an occupational physician. On the official pre-hiring checklist; treat this as a step to arrange rather than a numbered rule, since its exact scope was not verified here.
- Agree the contract and the pay. Checked against the sectoral scale and the CCT 43 floor, since minimum pay in Belgium comes from the joint committee, not from a statute.
Documents You Will Need
- Your KBO/BCE number and the company's articles of association.
- A description of the real activity, precise enough to fix the joint committee.
- The legal representative who will sign the WIDE form and the procuration.
- The employment contract terms: function, pay, hours, start date, place of work.
- The worker's identification data, for the Dimona.
- Bank details for net pay and for the contribution payments.
- The occupational accident insurance policy, or a mandate for us to arrange one.
Bookkeeping for the business once payroll is running is a separate question: see accounting belgium.
Not Sure Which Joint Committee Your Business Falls Under?
The wrong committee delays your very first Dimona and can misprice every pay run that follows.
What an Employee Costs, and What the State Charges
No competitor in the market publishes even one of these rates. The lead figure is ours, not the ONSS's: the regulator publishes 19.88% and up to 5.12% wage moderation for category 1 and 3 workers as two separate figures in its instructions on social security contributions, and this page adds them to about 25% of gross. The employer share also splits by branch: pensions 8.86%, health care 3.80%, sickness indemnities 2.35%, unemployment 1.46%, occupational diseases 1.00%, work accidents 0.30%.
| What the state charges | Amount | Source and year |
|---|---|---|
| Basic employer contribution | 24.92% of gross | ONSS instructions 2026/3, 2026 |
| Reduced rate, categories 1 and 3, from Q1 2018 | 19.88% of gross | ONSS instructions 2026/3, 2026 |
| Wage moderation, general formula, capped for categories 1 and 3 | 5.67% of pay plus 5.67% of employer contributions, plus 0.40% under the holiday laws, capped at 5.12% for categories 1 and 3 | ONSS instructions 2026/3, 2026 |
| Employee personal contribution | 13.07% of gross | ONSS instructions 2026/3, 2026 |
| Blue-collar annual holiday contribution | 15.84% of gross at 108%, due 31 March, payable by 30 April | ONSS instructions 2026/3, 2026 |
| Additional contribution once averaging 10 or more workers | 1.60%, or 1.69% with wage moderation | ONSS instructions 2026/3, 2026 |
| Asbestos-fund special contribution, 2026, quarters 1 to 3 | 0.01% | ONSS instructions 2026/3, 2026 |
| Work-accidents special contribution | 0.02% | ONSS instructions 2026/3, 2026 |
| DmfA correction made ex officio | flat EUR 50.00 plus EUR 4.00 per missing or changed line | ONSS instructions, DmfA omission, 2026 |
| DmfA not filed by the deadline | flat EUR 495.79 plus EUR 247.89 per tranche of EUR 24,789.35 above EUR 49,578.70 | ONSS instructions, DmfA omission, 2026 |
| Penalty relief | not charged if filed within two months by an employer who usually files on time; an imposed penalty reducible up to 50%, or 100% by the Management Committee, once all contributions are paid | ONSS instructions, DmfA omission, 2026 |
| Fedris fine for an uninsured employer | scaled to the uninsured period and headcount, described as a fine, not a premium | ONSS instructions, occupational accidents, 2026 |
Payroll is not the only recurring filing a Belgian employer owes: see filing annual accounts with the National Bank of Belgium.
Once You're Running Payroll: The Recurring Cycle
- Dimona IN for each new worker. Due at the latest the moment the worker starts working; the recorded data become final after a 5-working-day window to contest them.
- Run the monthly pay. Gross calculated on the sectoral scale, the 13.07% employee contribution and the wage-tax withholding taken out, net paid: the accredited secretariat's job, on your instruction.
- Employer contributions provisioned. Collected quarterly by the accredited secretariat where one is appointed, against the four payment dates below.
- File the DmfA. Due 30 April, 31 July, 31 October and 31 January; a late filing carries the penalties in the table above.
- Pay both contribution shares. Must reach the ONSS by the same four dates; an employer share not withheld in time cannot be reclaimed from the worker later.
- Annual holiday debit notice. Issued by the ONSS in March for blue-collar staff, due 31 March, payable at the latest 30 April.
- Dimona OUT on departure. Due at the latest the first working day after the relationship ends, plus a 15.34% exit holiday pay bill for a departing white-collar worker.
- Keep the social documents current. The general personnel register and the individual account, maintained continuously and in practice kept up to date by the mandatary.
Problems We Solve
-
The Employer-of-Record Trap
Belgium prohibits lending staff to a user exercising employer authority (Law of 24 July 1987, Arts. 31, 32, 32bis). Cross that line and the contract is void, the client becomes employer, liability joint and several.
-
The Joint Committee Foreign Founders Never Expect
Minimum pay is not set by a statute; it comes from the sector's collective agreement. The committee number is a mandatory field on your very first Dimona, so it cannot wait past the first morning.
-
Accreditation as a Buying Test
The list of accredited social secretariats is published every year in the Moniteur belge and available from the ONSS Inspection directorate; an unaccredited provider may not collect the contributions due.
-
What the Two Deadlines Cost If Missed
Dimona is due the moment work starts; the DmfA and the payment fall on four fixed dates. Miss either and the penalties, the two-month grace period and the reduction mechanism are exact figures, not estimates.
-
Holiday Pay and the Thirteenth Month, Told Honestly
Holiday pay is large and sourced: 15.84% for blue-collar staff, 15.34% exit pay for a white-collar leaver. The thirteenth month has no federal statute behind it: where owed, the sector's own agreement creates it.
Weighing an Employer of Record Against Your Own Entity?
The Belgian rule on lending staff decides more of that comparison than either provider's pitch does.
Why Work With Us
Payroll files are prepared for the joint-committee determination, the ONSS identification through WIDE, the work rules and the accident-insurance arrangement, coordinating with an accredited social secretariat as your mandatary and staying the single point of contact for the recurring cycle that follows.
Related Services
Frequently Asked Questions
Do I need a Belgian company before I can put someone on a Belgian payroll?
Yes. The ONSS will not identify a company as an employer, and the WIDE application will not issue an ONSS number, until a KBO/BCE number already exists. That number is delivered at the formation stage, not here: once it is in place, the joint-committee and Dimona steps below can start straight away.
What is an accredited social secretariat (secretariat social agree), and why does almost every Belgian employer use one?
An ASBL accredited by the Minister of Social Affairs, holding the exclusive right to collect the ONSS contributions of its affiliated employers. Almost every Belgian employer uses one because calculating and filing payroll correctly is complex, and accreditation carries a legal standing that an ordinary provider does not have.
How do I check that a payroll provider is genuinely accredited, and what can an unaccredited provider not do?
The list of accredited social secretariats is published every year in the Moniteur belge, and a copy is available from the ONSS Inspection directorate. An unaccredited provider may not use the name "secretariat social," and it may not collect the contributions due, whatever its marketing says.
Which joint committee (commission paritaire) am I in, and why does it decide my minimum wage?
Your joint committee is fixed by your company's principal activity. Minimum pay in Belgium is not set by a statute but by the sector's own collective agreement, and the committee number is one of four mandatory fields on the very first Dimona you file, so it cannot be decided later.
What do I have to do before my first employee's first working day?
Determine the competent joint committee, draft and file the work rules within 8 days of entry into force, identify as an employer with the ONSS through WIDE, appoint your mandatary, and have occupational accident insurance in force. All of this has to be settled before day one, not after it.
When is the Dimona due, and what happens if it is late?
At the latest the moment the worker starts working; you then have five working days to contest the recorded data before it becomes final. A Dimona that is never filed at all carries criminal sanctions under Article 181 of the Social Criminal Code.
When is the DmfA due, and what does a late filing cost?
The DmfA falls due on 30 April, 31 July, 31 October and 31 January. A late filing costs a flat EUR 495.79 plus EUR 247.89 per tranche of EUR 24,789.35 of contributions due above EUR 49,578.70, waived if you file within the following two months and usually file on time.
What does an employee really cost me on top of gross salary?
The ONSS publishes a 19.88% reduced employer rate and a maximum 5.12% wage moderation for category 1 and 3 workers as two separate figures. Add them together and gross pay costs about 25% more in employer contributions, though that combined total is our own arithmetic, not one the ONSS itself prints.
What is holiday pay in Belgium, and why is it charged differently for white-collar and blue-collar staff?
Blue-collar holiday pay, 15.84% of gross at 108%, is paid out of the holiday fund rather than by the employer directly. White-collar staff are paid holiday pay by the employer itself, with a 15.34% exit holiday pay bill falling due the day the employment ends.
Is the thirteenth month compulsory?
No federal statute creates a thirteenth month in Belgium. Where one is owed, it is owed because the sector's own collective agreement creates it, the same mechanism that sets the joint committee's minimum wage. Check your own committee's agreement rather than assuming the answer either way.
Is automatic wage indexation real, and does it apply to me?
Yes, indexation is real and required, tied to the smoothed health index under Article 3bis of the Law of 23 April 2015. Each joint committee runs its own system and its own timing, so no single rate or date applies across every sector, and none is published here as a general figure.
Can I use an employer of record in Belgium instead of setting up my own entity?
Belgium prohibits lending staff to a user who exercises employer authority (Law of 24 July 1987, Articles 31, 32 and 32bis). Cross that line and the contract is void from the start, the user becomes the employer on an indefinite contract, both parties jointly and severally liable. We name the test; we do not rule on any named platform.
Can I just pay someone as a self-employed contractor instead?
Only if the relationship genuinely carries no subordination link. A rebuttable presumption of employment applies in six sectors once more than half of nine listed criteria are met, including working mainly for a single counterparty while carrying no financial or economic risk of your own.
Do I need occupational accident insurance, and when does it have to start?
Yes, and it is compulsory from the first day of your first worker's employment, with no retroactive cover available. Without it, Fedris affiliates the employer automatically and charges a fine, not an insurance premium, for the period the worker went uncovered.
Do I have to be in Belgium to run a Belgian payroll?
No requirement to be physically present turned up in the ONSS or FPS Employment sources for this page. The identification, the mandate and the recurring filings run through your appointed mandatary, though whoever signs the WIDE form and the procuration needs signing authority matching the company's published powers.
Ready to Set Up Belgian Payroll?
One enquiry gets the joint committee determined, the mandatary appointed, and the recurring cycle running, not a guess at what your first hire will cost.