Last updated: 16 September 2026
On the published rates, Belgium costs the employer more. Belgium's National Social Security Office, the ONSS, sets the basic employer contribution in the for-profit private sector at 25% of gross pay. Luxembourg charges several smaller rates instead. Added together, the 2026 employer rates published by the Centre Commun de la Sécurité Sociale come to roughly 12% to 15% of gross pay for a private employer.
That is not the whole answer. Luxembourg stops charging most contributions above a salary ceiling, so the gap grows as pay rises. Belgium states its rates as a share of gross pay and publishes no ceiling of that kind. The two countries also run different work permit routes, with different response times, and a different person files the application.
This page sets out the published employer rates, the permit route in each country, and the things that move the answer. It stays general on purpose. Your own figure depends on the salary, the role, and who is moving with the employee.
What does an employer pay on top of salary?
Belgium puts almost all of it in one rate. The ONSS sets the basic employer contribution at 25% of gross pay for the for-profit private sector. Employees pay 13.07% of gross salary on top of that. Extra charges can apply on some items, such as company cars, and reductions can apply for some groups of workers.
Luxembourg splits the same job into separate lines. The CCSS publishes a rate for each risk for 2026: pension, health cover, accident, occupational health and the employers' mutual insurance. Some are shared with the employee, some are paid only by the employer. The accident rate moves with a bonus or malus factor, and the mutual insurance rate moves with the company's own absence record.
| Item | Luxembourg, 2026 | Belgium, 2026 |
|---|---|---|
| Headline employer rate | Charged as separate rates per risk, listed below | 25% of gross pay, basic rate, for-profit private sector |
| Pension, employer share | 8.50% | Inside the 25% basic rate |
| Health cover, employer share | 2.80%, plus 0.25% for cash benefits | Inside the 25% basic rate |
| Accident insurance | 0.65% base rate, then a bonus or malus factor | Inside the 25% basic rate |
| Occupational health | 0.14% for private employers using the STM service | Not published as a separate line |
| Employers' mutual insurance | 0.23% to 2.66%, by absence class | Not published as a separate line |
| Employee's own contribution | 8.50% pension, 2.80% health, 0.25% cash benefits, 1.40% dependency insurance | 13.07% of gross salary |
| Ceiling on the pay charged | Five times the minimum social wage, €13,856.63 a month from 1 June 2026 | Rates stated as a share of gross pay, with no ceiling of that kind published |
| Main permit route from outside the EU | Temporary authorisation to stay, or the EU Blue Card for highly qualified roles | Single permit, covering work and residence, for stays over 90 days |
| Who files it | The worker, who may ask the employer to act for them | The employer, to the region where the job sits |
| Response time the body states | Normally up to 4 months, or up to 3 months for the Blue Card | Up to 120 days in the Brussels region |
Sources for the table: the CCSS rate notice for 1 January 2026 and Guichet.lu for Luxembourg, and the ONSS, Working in Belgium and Brussels Economy and Employment for Belgium. Each is linked once elsewhere on this page.
Which employer costs are capped?
Luxembourg's are, for the most part. Guichet.lu publishes the contribution ceiling with the rest of the social parameters. From 1 June 2026 it is €13,856.63 a month, which is five times the minimum social wage for an unskilled adult worker. Pay above that line does not attract most contributions, for the employer or the employee.
Belgium works differently. The ONSS states its rates as a share of gross pay and does not publish a general ceiling in the same way. Reductions and extra charges exist, but they depend on the worker, the sector and the pay items involved, so they are not something to assume.
The practical effect is simple. At a modest salary the two countries sit closer together than the headline rates suggest. As pay climbs past the Luxembourg ceiling, the Luxembourg employer cost flattens while the Belgian one keeps rising with salary. That single point moves a lot of comparisons, which is why a like-for-like figure needs a real salary in it. Our employer cost calculator is a starting point for that.
How does someone from outside the EU get permission to work?
Luxembourg runs a two step route. Guichet.lu says the worker must apply for a temporary authorisation to stay from the Ministry of Home Affairs before coming to Luxembourg, and that an application made from inside the country is not admissible. The worker files it, though they may ask the employer to act for them. The reply normally takes up to four months. Before that, the employer has to declare the vacant post to ADEM, the national employment agency.
For a highly qualified role there is a second option. Guichet.lu sets out the EU Blue Card, which needs a contract of at least six months and a gross annual salary of at least €65,652. The stated reply time is normally up to three months. Whether a role clears that bar is a question about the job description and the pay, not about the country.
Belgium uses one document. The federal Working in Belgium service explains that the employer applies for a single permit, which covers work and residence together for stays of more than 90 days, and that the competent region handles it. That means Flanders, Wallonia or Brussels, depending on where the job sits. Brussels Economy and Employment states that its procedure takes at most 120 days from the point it holds a complete file. The other regions publish their own conditions, so the region is part of the answer, not a detail.
What about the employee's own take-home pay?
Both countries take social contributions and income tax from the employee, and both tax income at rising rates. The contribution side is set out in the table above. The tax side depends on the person, not just the country, because family situation, allowances and the tax class all feed into it.
One point is worth flagging early. If the employer fixes the gross salary rather than the total cost of employment, every difference between the two tax systems lands on the employee's net pay. If the employer fixes the total cost instead, the gross salary has to move to fit it. Those are two different conversations, and it is better to have the right one before a destination is chosen. The Luxembourg hiring guide and the Belgium hiring guide cover the wider employment rules in each country.
Which one should you choose?
We are not going to pick for you, because four things change the answer and none of them is on this page. The first is the salary. Because of the Luxembourg ceiling, the two countries can look close at one salary and far apart at another. The second is who is moving. A partner and children change the permit picture and the household cost, and the rules for family members are set separately in each country.
The third is the region in Belgium, since the permit conditions and timing are regional, not federal. The fourth is how long the person is staying. A move meant to last two years and a move meant to last ten are not the same decision, and neither is a move where the employee later wants to settle. The right answer depends on your employee's situation. Talk to an Expert at Teamed to work through yours.