Belgium has three regions, each with its own rental legislation. These differences matter for a correct calculation.
Rental law in Belgium is regionalised. Flanders applies its Residential Lease Decree, Brussels its Housing Code, and Wallonia its 2018 decree. While the basic formula is identical everywhere, the additional rules and limitations differ.
The strict EPC limitation of October 2022 ended on 1 October 2023. Since then every label may be indexed again, but leases that took effect before October 2022 with label D, E, F or no EPC retain a correction factor. Retroactivity is capped at three months. For residential leases from 2019 onwards, the date of taking effect serves as the starting date.
The Brussels-Capital Region has applied comparable EPB restrictions since October 2022, through an official coefficient. Brussels rules are often stricter, with specific provisions for renovation leases and social housing. Language requirements also differ.
Wallonia currently has the most flexible rules: no specific EPC restrictions on indexation. The standard formula applies regardless of label. Here the base index follows the signing date of the lease. The 2018 Walloon decree has its own rules on duration, notice and rental deposit.
Belgium has three regions, each with its own rental legislation.
Despite regional differences, the basic formula is identical across Belgium: new rent = base rent × new index ÷ base index. Statbel's health index is the reference in all three regions.
In Flanders leases are generally in Dutch, in Wallonia in French. In Brussels the tenant is entitled to a contract in their own language. Our indexation letters are automatically drafted in the tenant's language.
When registering your lease, our platform asks in which region the property is located. Based on that we automatically apply the correct rules: correction factors in Flanders and Brussels, the standard formula in Wallonia, and the right language for the letter.
Rental legislation keeps evolving. Our platform is regularly updated to comply with the latest rules in each region. You do not need to follow legal changes — we apply them automatically.
Enter your base rent, start date and region and see straight away what you may charge this year. Based on the official health index, with the Flemish EPC correction applied automatically.
Go to the free calculator →Submit your contract and never miss an indexation.