Most European countries dismantled automatic wage indexation after the inflation of the 1970s, on the reasoning that linking pay to prices turns a one off shock into a spiral. Belgium kept it. Pay in most of the private and public sector adjusts automatically to a price index, without a negotiation, and it is one of the few systems of its kind left in the euro area.
The index used is not the headline consumer price index. It is the health index, which strips out tobacco, alcohol, petrol and diesel, a construction designed to keep excise duties and fuel volatility from feeding directly into pay. Public sector wages and social benefits then move when a threshold known as the pivot index is crossed, which triggers an uplift of two percent. Private sector arrangements vary by joint committee, some adjusting on a fixed date each year, others when the threshold is passed.
The effect on households is straightforward. When prices rise sharply, Belgian real incomes hold up better than those of neighbours where wages catch up only through bargaining, and they catch up faster. During the energy price shock this was visible in consumption data: the mechanism transferred the hit from households towards employers and the state.
The effect on the economy is more contested. Employers argue that indexation raises Belgian labour costs relative to Germany, France and the Netherlands whenever inflation runs faster here, and successive governments have used a wage norm law to cap negotiated increases on top of the automatic ones as a partial offset. Economists disagree about the size of the competitiveness loss rather than about its direction.
For anyone reading Belgian inflation data, the practical point is timing. An inflation shock does not pass through the Belgian economy in a single move. It arrives, it is absorbed, and then it reappears months later inside labour costs. Comparisons between Belgian and euro area inflation that ignore that lag will usually reach the wrong conclusion about what is happening.