Calculate your rent indexation, correctly and in 30 seconds
Using the official Statbel health index (latest available: May 2026), the correct starting index for your region and the EPC/EPB correction factor where the law requires it. Free, no account needed — ready-made indexation letter included.
- Official Statbel figures
- All regions & EPC rules
- Free indexation letter
How does the calculation work?
The legal formula for residential leases is basic rent × new index ÷ starting index (art. 1728bis of the old Belgian Civil Code and the regional tenancy rules). The new index is the health index of the month before the anniversary of your contract’s entry into force. The starting index depends on your region and the start date: for Flemish contracts from 2019 onwards it is the month before the entry into force, otherwise the month before signing. For older contracts with a poor energy label, the tool also automatically applies the mandatory correction factor (Flanders and Brussels).
Official figures
Complete Statbel health index series since 1994, updated monthly. View the index figures.
All regions, all cases
Flanders, Brussels and Wallonia, including the 2022–2023 energy freeze, correction factors and cohort rules.
Letter included
Turn your calculation into a legally correct indexation letter with one click — also as a tenant, to check an indexation.
Frequently asked questions
Which index do I use for rent indexation?
Always the Statbel health index, not the ordinary consumer price index. Numerator and denominator must use the same base year; this tool calculates in base 2013=100.
When am I allowed to index the rent?
Once per lease year, at the earliest on the anniversary of the contract’s entry into force. The indexation applies retroactively for a maximum of three months from your written request.
What is the starting index?
For Flemish contracts that entered into force from 1 January 2019, it is the health index of the month before the entry into force. In all other cases, it is the index of the month before the contract was signed.
What does the EPC label do to my indexation?
For contracts predating the 2022 energy freeze with a poor energy label (Flanders: D/E/F, Brussels: E/F/G), a permanent legal correction factor limits the indexation. This tool applies it automatically.
Is this calculation official?
The tool uses the official Statbel health index figures and the legal formulas per region. The result is an accurate calculation, but not legal advice: special contract clauses may deviate.
Want to know more? Read the rent indexation guide.