Rent indexation in Brussels: registration, EPB and correction factors
Last reviewed on 2026-06-10 · reading time ± 3 min
Brussels has the strictest conditions of the three regions. Before you calculate a single figure, two formalities must be met:
- the lease is registered (free of charge, via MyMinfin);
- the EPB certificate was presented/handed over to the tenant.
If either is missing, indexation is not allowed for as long as that remains the case. The tenant may then reclaim an indexation that was charged anyway.
The standard calculation
After that, the usual formula applies: basic rent × new index ÷ starting index, using the health index. The new index is that of the month before the anniversary of the entry into force; the starting index is that of the month before the signing of the contract.
The Brussels energy freeze and the correction factors
Between 14 October 2022 and 13 October 2023, indexation in Brussels was limited based on the EPB label: label E could index at 50%, labels F and G not at all. For contracts that entered into force before 14 October 2022 with label E, F or G, that restriction carries on permanently through a correction factor (ordinance of 13 October 2023):
- Label F or G: correction factor = index A ÷ index B
- Label E: correction factor = 0.5 × (index A + index B) ÷ index B
Which years "A" and "B" are depends on when your contract's anniversary fell during the freeze year: if it fell between 14 October and 31 December 2022, you use the index figures of 2021 and 2022; if it fell between 1 January and 13 October 2023, those of 2022 and 2023 — in each case the month before the anniversary. The factor remains in force until you can present a better EPB certificate (A through D).
In practice
Because of the cohort system, the Brussels calculation is more error-prone than the Flemish one. Our calculator automatically determines the right cohort and factor based on your contract dates and EPB label, and points out the registration and EPB conditions. You turn the result into an indexation letter with one click.