Free checker

Check my rent increase

See whether the new rent your landlord is asking for matches the legal indexation — using the same official health index landlords must use.

Belgium
Printed on your lease agreement, next to the rent amount.
What's written in the letter or message you received.
Leave blank to use the official figure automatically, where available.

This tool is informational only and not legal advice. It applies the standard Belgian health-index formula and does not account for Brussels' EPC-related correction or contract-specific clauses. Always check your lease and, if in doubt, a professional or a tenants' association.

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Frequently asked questions

Belgian residential leases almost always use the health index (indice santé/gezondheidsindex). If your lease specifies something else, that clause may not be valid — check with a tenants' association.

You're only legally required to pay the correctly calculated amount. Raise the discrepancy with your landlord in writing before withholding payment, and consider getting advice from a tenants' association.

At most once a year, on the anniversary of your lease's start date — not before.