Belgian payroll and employment law glossary

An accident at work is a sudden event during and because of the performance of work, or on the way to and from work, that causes an injury. The employer reports it to its accident insurer within 8 days.

ADV days are paid rest days an employee gets because they work longer each week than the average working time. ADV stands for arbeidsduurvermindering, Dutch for reduction of working time. Someone who works 40 hours a week reaches the statutory average of 38 hours with about 12 ADV days a year.

A benefit in kind is a non-cash benefit an employee gets from the employer, such as a company car, a phone or a laptop for private use. It is valued at a flat rate and taxed. For a company car it is at least € 1,690 a year in 2026.

Bogus self-employment is a working relationship that is self-employed on paper but in practice runs under authority, as for an employee. The NSSO assesses it with 4 general criteria and can reclaim contributions if it is requalified.

The C4 is the unemployment certificate the employer issues when an employment contract ends, stating the length of employment and the reason for the end. The employee needs it to claim unemployment benefit. The employer issues it on the last working day at the latest.

A CAO, or collective labour agreement, is a written agreement between unions and employers or employers' organisations on pay and working conditions. A sector agreement binds every employer in the joint committee 15 days after the filing notice is published in the Belgian Official Gazette.

A control doctor is a doctor the employer sends at its own expense to check that a sick employee is really unfit for work. The employee may not refuse the check.

Dimona is the electronic declaration in which the employer reports the start and end of every employment to the NSSO, before the employee starts. Letting someone work without a Dimona risks an administrative fine of € 3,000 to € 35,000 per employee.

The DmfA is the quarterly return in which the employer reports each employee's pay and working time to the NSSO. It is due by the last day of the month after the quarter. A late return costs at least € 495.79.

Double holiday pay is an extra premium on top of pay for holiday days. A white-collar employee gets 92% of gross monthly pay from the employer. For manual workers, the holiday fund pays it together with single holiday pay.

The end-of-year bonus is a bonus imposed by the joint committee's collective agreement, often equal to a month's pay and paid in December. There is no general statutory end-of-year bonus: without an agreement it is not mandatory.

A flexi-job is a side job for someone who already works at least 4/5 elsewhere or is retired. The employer pays no ordinary RSZ but a special contribution of 28%. Since 1 July 2026 it has been possible in almost all sectors.

Gross pay is pay before deductions. The personal RSZ contribution of 13.07%, withholding tax and the special social security contribution are taken off it. What remains is net pay.

Guaranteed pay is the pay the employer itself continues when an employee is sick. A white-collar employee gets full pay for 30 calendar days. For a manual worker, the employer pays the first week in full and then a decreasing share.

Holiday pay is pay for the statutory holiday days, single holiday pay, plus a premium, double holiday pay. A white-collar employee gets it from the employer. A manual worker gets it from the holiday fund: 15.38% of their pay at 108% from the previous year.

Indexation is the adjustment of pay and benefits to rising living costs. Each joint committee decides when and how: in JC 200, pay rose by 2.21% on 1 January 2026.

A joint committee (paritair comité) is the consultation body of employers and unions for a sector. It concludes the collective agreements on pay scales, bonuses and working conditions. Each employee falls under a committee according to the employer's main activity and their status as a manual or white-collar worker.

Limosa is the mandatory notification to the NSSO before a foreign employee or self-employed person comes to work temporarily in Belgium. The Belgian principal asks for the L1 notification receipt before work starts.

Meal vouchers are a fringe benefit of at most € 10 per day worked, free of RSZ and tax if the conditions are met. The employer's share is at most € 8.91, the employee pays the rest.

The GGMMI, the guaranteed average minimum monthly income, is the statutory minimum wage for a full-time adult employee in Belgium. Since 1 July 2026 it has been € 2,233.61 gross a month.

A non-compete clause bars an employee from carrying out a competing activity after leaving. It is only valid above gross annual pay of € 44,447 and if the employer pays compensation.

The notice period is the time between notice of dismissal and the end of the employment contract, during which the employee keeps working and being paid. Its length depends on seniority. For contracts starting from 1 August 2026, the employer gives 1 week's notice in the first 6 months.

The NSSO employer number is the number the NSSO uses to identify an employer. The employer gets it through the WIDE application when hiring the first employee, and needs it for every Dimona and DmfA.

Outplacement is support from a specialised agency to help a dismissed employee find new work faster. It is mandatory with a notice period or payment in lieu of notice of at least 30 weeks, and in some cases for older employees.

Parental leave lets an employee interrupt or reduce work to care for a child, with a benefit from the National Employment Office. Full-time it lasts 4 months per child. The employer can postpone it but not refuse it if the conditions are met.

A pay scale, or barema, is the minimum wage a joint committee sets in a collective agreement for a job, usually by category and seniority. The employer may pay more, never less.

Payment in lieu of notice is the pay the employer owes when it ends the employment contract immediately without having the notice period worked. It equals current pay for the notice period or the part that remains.

A reintegration process is the procedure that lets a long-term sick employee return to adapted or other work. If the company has 20 or more employees, the employer starts a process for a sick employee with work potential no later than 6 months after the sickness began.

The RSZ, the National Social Security Office (NSSO), collects social security contributions on pay. For most employees, the employer pays 25% of gross pay and deducts 13.07% from the employee.

Serious cause is a grave fault that makes any further working relationship immediately and permanently impossible. The employer then dismisses without notice or compensation, but must do so within 3 working days of knowing the facts with certainty.

Short leave (klein verlet) is paid absence for family events and civic duties, such as a wedding, a death or a summons as a witness. The law sets the minimum number of days, the joint committee can grant more.

A social bureau is an office that takes over employers' staff administration: payroll, Dimona, contracts and leave, with one fixed contact. It is not a social secretariat itself and may not collect NSSO contributions. It works with a recognised social secretariat that files the returns, or acts as a service provider itself.

A social secretariat is a non-profit association approved by the authorities that, as the employers' agent, handles payroll administration, files returns with the NSSO and collects and pays over contributions. The official list of 20 June 2025 counts 25 social secretariats with an active head office.

The special social security contribution (BBSZ) is an extra deduction from the employee's pay, on top of ordinary RSZ. It depends on quarterly pay and family situation and amounts to at most € 182.82 per quarter.

In temporary unemployment, the employer suspends the employment contract for a while, for instance due to lack of work for economic reasons or force majeure. The National Employment Office then pays the employee a benefit, for economic reasons 60% of capped pay.

Time credit lets an employee interrupt their career full-time or part-time with a benefit from the National Employment Office, for a reason such as caring for a child or training. In a company with at most 10 employees, the employer decides whether to allow it.

With wage garnishment, the employer withholds part of net pay at a creditor's request and passes it on. Part of pay is protected: in 2026 a net monthly wage up to € 1,419 cannot be seized at all.

The withholding obligation requires a principal to withhold part of an invoice and pass it on if its contractor has debts: 35% for debts to the NSSO, 15% for tax debts. You check it before every payment on checkinhoudingsplicht.be.

Withholding tax (bedrijfsvoorheffing) is the advance on personal income tax that the employer deducts from pay and passes on to the FPS Finance every month or quarter. The employee offsets it in their tax return. In 2026 the brackets run from 26.75% to 53.50%, municipal tax included.

The work bonus is a reduction of the personal RSZ contribution of 13.07% for employees on a low wage, so they keep more net. The employer applies it automatically on the payslip, its own cost does not change.

The work rules are the mandatory document in which the employer sets out working hours, how pay is made, notice rules, sanctions and the rights and duties of staff. Every employer must have them from the first employee and file them with the Social Legislation Inspectorate.