Indexing a residential rent in Belgium
Pick the region, the base rent from the lease, the signing and start months and the energy label: the tool applies the formula and the regional correction.
Belgian residential rents are not reviewed by a national index of rents but indexed once a year on the health index (indice santé, gezondheidsindex), the consumer price index without tobacco, alcoholic drinks and motor fuel except LPG. The latest value published by Statbel is 140.67 for September 2026 (base 2013). The formula is the same in the three regions: base rent written in the lease, multiplied by the new index and divided by the starting index. What differs is the detail. In Brussels and Wallonia the starting index is that of the month before the lease was signed; in Flanders it is the month before the lease took effect. The new index is that of the month before the anniversary of the start date. Indexation is never automatic: the landlord must ask in writing, and can claim it for at most three months before the request. Each region also cuts the indexation of homes with a poor energy label for leases that started before autumn 2022, and those cuts still apply today.
Indexed rent (Brussels-Capital)
€1,066.77
from June 2026 · +25.50% on the base rent
€850.00
| Starting index | 110.93 · April 2021 |
| New index | 139.22 · May 2026 |
| Fully indexed rent | €1,066.77 |
| Rent that can be charged | €1,066.77 |
Assumptions
Statbel health index, base 2013. Indexation must be requested in writing and can go back three months at most; in Flanders a late request uses the index at the time of the request. Method and sources
Checked by Radif Partners · Editorial policy · Method and sources
The three regions compared
| Brussels | Wallonia | Flanders | |
|---|---|---|---|
| Starting index | Month before signing | Month before signing | Month before the start date |
| New index | Month before the anniversary | Month before the anniversary | Month before the anniversary (or of a late written request) |
| Energy-label correction | EPB E, F, G; lease in force before 14 October 2022 | EPB D to G or none; anniversary between 1 November 2022 and 31 October 2023 | EPC D, E, F or none; lease in force before 1 October 2022 |
| Other condition | Lease registered, valid EPB given to the tenant | Main-residence lease registered | Oral lease: only if the indexation was agreed and can be proven |
Same lease, two answers
A lease signed in May 2021, in force from 1 June 2021, base rent €850, energy label C, indexed in June 2026. In Brussels or Wallonia the starting index is April 2021 (110.93) and the indexed rent €1,066.77. In Flanders it is May 2021 (110.99) and the result €1,066.20. Both use May 2026 (139.22) as new index.
Regional details and sources
Brussels: Brussels rent indexation and be.brussels, rent indexation with a correction factor. Wallonia: Wallonia rent indexation and Wallonie.be, indexing a rent. Flanders: Flanders rent indexation and Vlaanderen.be, rent indexation with correction factors. Index values: the health index page, Statbel, health index and Statbel, gezondheidsindex (Dutch page).