What is automatic salary indexation?
Automatic salary indexation is the Belgian system that raises wages in line with the cost of living without a new negotiation. Collective labour agreements in each joint committee link minimum pay scales, and in most sectors actual salaries, to the health index, so pay goes up when prices do.
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Schedule a strategy callHow indexation works
The reference is the health index, a version of the consumer price index that leaves out alcohol, tobacco and motor fuel. Most mechanisms use the smoothed health index, the average of the last four months. Each joint committee sets its own method, and there are two main types:
- Fixed dates. Salaries are indexed on set dates by the change in the index over the previous period. Joint Committee 200, the largest committee for white-collar employees, indexes once a year on 1 January: the increase in January 2026 was 2.21%.
- Pivot index. Salaries rise by 2% each time the smoothed health index passes a threshold called the pivot index, so the timing depends on inflation. Public sector pay and social benefits follow this system.
The 2026 cap on salaries above €4,000
From 1 June 2026, a temporary measure limits indexation for higher salaries. For a fixed monthly base salary above €4,000 gross, measured on a full-time basis, the first 2% of indexation is calculated on €4,000 only, and any indexation above 2% applies to the full salary. A €4,500 salary indexed by 2.2% becomes €4,589 instead of €4,599. Salaries of €4,000 or less are indexed as usual.
Employers pay half of what they save to the National Social Security Office as a special wage moderation contribution. In Joint Committee 200, the cap first applies to the indexation of 1 January 2027, and a second period is planned from 1 January 2028.
What it means for employers
Indexation is not optional. Where the sector agreement provides for it, the employer must apply it on the dates and to the pay the agreement sets, which in most sectors includes actual salaries and not only the minimum scales. A salary agreed today will therefore rise at the next indexation date, and the cost of a Belgian hire depends on the joint committee’s method.
Indexation when TopSource runs your payroll
When TopSource runs your payroll in Belgium, we apply each indexation on the date your joint committee sets, including the 2026 cap and the special contribution where they apply, and show the effect in your cost projections before it reaches payroll.
Frequently asked questions
How often are salaries indexed in Belgium?
It depends on the joint committee. Some index once a year, like JC 200 on 1 January, others on several fixed dates a year, and others by 2% each time the smoothed health index passes the pivot index.
Can a Belgian employer skip salary indexation?
Not where the sector agreement provides for it. Indexation clauses in generally binding sector agreements apply to every employer in that joint committee.
What is the indexation cap on salaries above €4,000?
From 1 June 2026, for full-time base salaries above €4,000 gross a month, the first 2% of indexation is calculated on €4,000 only. Indexation above 2% applies to the whole salary.