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Rent indexation calculator (Belgium)
Work out your legal rent increase using the official Belgian health index — free, no account needed, with a ready-to-send letter to your tenant.
Belgium
This calculator is informational only and not legal advice. It applies the standard Belgian health-index formula; it does not yet account for Brussels' EPC-related corrections or contract-specific clauses. Always check your lease and, if in doubt, a professional.
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Frequently asked questions
The health index is the Belgian consumer price index excluding tobacco, alcohol and fuel, published monthly by Statbel. Most Belgian residential leases use it to adjust rent once a year.
At most once a year, on the anniversary of the lease's start date — never earlier.
In most cases you can claim missed indexation retroactively for up to one year. Confirm the details for your specific situation with a professional.
The formula is the same in Flanders, Brussels and Wallonia. Note that Brussels applies an additional EPC-related correction in some cases, which this calculator does not compute yet.