Spilindex Crossed: 5 Million Belgians to Receive 2% Wage Increase This Summer
More than 5 million Belgians are set to receive an automatic 2% wage increase this summer after the country’s spilindex (pivot index) was exceeded in late June 2026. The mechanism, which triggers when the smoothed health index crosses a predetermined threshold, affects approximately 2 million private and public sector workers and 3.5 million benefit recipients, including pensioners and those receiving unemployment or sickness benefits.
How the Spilindex Works
Belgium’s automatic wage indexation system is one of the most comprehensive in Europe. When the spilindex is crossed—meaning the cost of living has risen by 2% since the last threshold crossing—wages and social benefits are automatically adjusted upward. The health index, calculated monthly by the national statistics office Statbel, measures consumer price evolution excluding alcohol, tobacco, gasoline, and diesel.
According to Het Laatste Nieuws, the last spilindex crossing occurred in December 2025. The current crossing means that consumer prices have risen 2 percent since that point, driven primarily by higher energy costs linked to the ongoing Middle East conflict.
Sector-by-Sector Timing
The timing of the wage increase varies significantly depending on the sector and employer:
July 2026: Multiple private sector joint committees (PCs) receive their 2% increases immediately, including the diamond sector (PC 324), sheltered workshops (PC 327), private hospitals and elderly care (PC 330), and childcare (PC 331). The metal, machine, and electrical construction sectors (PC 111, 209) receive a higher 2.8% increase, as they index wages only once per year. HLN work expert Stijn Baert noted that “in this sector, wages rise the most, namely by 2.8 percent.”
August 2026: Non-profit sectors linked to government funding receive their increases, including Flemish home care (PC 318), educational institutions (PC 319), and the socio-cultural sector (PC 329).
September 2026: Government employees (over 1 million) and benefit recipients (3.5 million) receive their 2% increase. Under new rules introduced by the De Wever government, these increases are delayed by three months from the spilindex crossing.
First Application of the Centenindex
This indexation cycle marks the first application of the new “centenindex” (cent-index) mechanism, a budget consolidation measure introduced by Prime Minister Bart De Wever’s government. As reported by the Flemish Government, the centenindex limits full percentage-based indexation for higher incomes.
Starting September 2026, wages above €4,000 gross per month will only receive full indexation on the portion up to €4,000, with the excess receiving a fixed €80 increase. For social benefits above €2,000, the cap is €40. According to Attentia, employers must remit half of the savings from the cap to the government through the National Social Security Office (RSZ).
Economic Context
Inflation in Belgium stood at 3.4% in June 2026, up from 1.65% in March 2026. The Federal Planning Bureau had initially forecast the spilindex would be exceeded in July 2026, later revising its projection to late June as energy prices surged. The Planning Bureau now expects a second spilindex crossing in December 2026, which would trigger another indexation in March 2027.
Since inflation at 3.4% exceeds the 2% indexation rate, purchasing power will still decline in real terms for most workers despite the automatic adjustment. The Planning Bureau forecasts inflation peaking at 4.43% in January 2027.
Analysis and Implications
The centenindex has generated controversy since its announcement. Unions (ACV, ABVV) oppose the measure as an attack on the indexation system, while employers’ organizations have raised concerns about its complexity. The measure was delayed from its original January 1, 2026, target to June 1, 2026, as a political compromise.
Belgium’s automatic wage indexation system has long been criticized by international institutions such as the IMF and OECD for potentially harming export competitiveness. The centenindex partially addresses these concerns while preserving the core mechanism that protects purchasing power for lower and middle incomes.
What to Watch For
A second spilindex crossing is forecast for December 2026, which would trigger another 2% increase in March 2027. The centenindex will apply a second time in 2028, with the exact timing dependent on wage growth. The long-term sustainability of Belgium’s indexation system remains a subject of ongoing political and economic debate, particularly as inflation continues to outpace automatic adjustments.