Your indexed rent calculation,
clear and without surprise.
Indexation-loyer.be applies the Belgian legal formula to your lease data. You leave with the indexed amount and a notification letter ready to send. No sign-up, no advertising.
A few details.
The calculation from your data.
Property region, lease dates, initial rent, EPC class. The calculation runs instantly.
Rent indexation, explained like to a neighbour over a coffee.
Track the cost of life, not the market.
Indexation tracks official inflation. For the landlord: the value of the rent is preserved. For the tenant: no arbitrary increase.
Inflation, without tobacco or fuel.
Statbel publishes this index monthly, excluding volatile products. It is this index — and only this one — that applies to residential leases.
Once a year, on the anniversary date.
A lease can only be indexed once a year, at the earliest on the anniversary of its entry into force — and only on written request.
Three regions, three rule sets. We handle it.
Brussels-Capital
Walloon Region
Flemish Region
Current regimes. The factors and the adapted-rent method only concern leases that took effect before October-November 2022; more recent leases are indexed at 100%. In Brussels, a registered lease and an EPB certificate provided to the tenant are required to index.
Your questions, our answers.
Can the landlord apply indexation retroactively? +−
Yes, but only for the past three months. Beyond that, they lose the right to claim the difference.
Is rent indexation mandatory? +−
No, it is a right of the landlord, not an obligation.
What if my landlord's calculation differs from yours? +−
The formula is public and identical for everyone. The justice of the peace settles disputes at low cost, without a mandatory lawyer, if needed.
My EPC rating is unknown — what should I do? +−
In Brussels, no indexation is due without an EPB certificate provided to the tenant: have one issued. In Flanders no EPC is required, but without one the strongest correction factor applies to leases that took effect before 1 October 2022. In Wallonia the certificate is not a general condition to index, but a dwelling without one that was concerned in 2022-2023 remains under the adapted-rent method.
What if my lease was signed before 2022? +−
Those are precisely the leases for which the certificate matters. In Brussels (lease in force before 14 October 2022, EPB E, F or G) and in Flanders (before 1 October 2022, EPC D, E, F or no EPC), the indexed rent is multiplied by a correction factor. In Wallonia, leases with EPB D to G or no certificate that had an anniversary between 1 November 2022 and 31 October 2023 follow the adapted-rent method. More recent leases are indexed at 100%.
Is my data stored? +−
No data is stored. Calculations transit through our API and are neither logged nor associated with your identity.
The right calculation for your rent, in three clicks.
No sign-up, no advertising. The calculation asks for no email; only the PDF letter is sent to your email address. A civic service, made in Brussels.