Free calculator · Belgium
Once a year, the rent may follow the health index. Huurindex works it out under your region's rules, shows every step and drafts the letter. For the landlord who wants to ask the right amount, and the tenant who wants to check it.
Who it's for
Landlord
Tenant
What it takes into account
Flanders, Brussels and Wallonia each have their own rules. Huurindex applies those of the region where the home is.
The new index is that of the month before the anniversary; the starting index depends on the region and on when the lease was signed.
The correction factors of Flanders and Brussels since October 2023, and in Wallonia the new base rent after the limited year 2022–2023.
A registered lease and an EPB certificate in Brussels, registration in Wallonia, a written lease in Flanders: you see what's needed.
Enter the month of the written request and you see from when the new rent applies, and how much may have to be paid back.
The health index since 1994, straight from Statbel's file. A figure that isn't published yet, you enter yourself.
How it works
Region, base rent, the month of signing, the start date and the energy label. Nothing more.
The calculation tape shows every step, with the index figures and their month. The result is the highest rent from the anniversary.
As a landlord, you print the indexation letter. As a tenant, you compare with what you're asked, and share the link.
Sources
Every rule in Huurindex comes from a legal text or from the page of the competent government, and those governments' worked examples are tests in the code: they must match to the cent. The index figures come from Statbel's file, updated on 29 September 2026.
Huurindex is a free project by nealvdv. No estate agent, tenants' union or owners' association is behind it: just the sum and the sources.
All rules with sourcesQuestions
Not there? Read the rules per region, with the source of each rule.
It is the highest rent the landlord may ask with the indexation. They may ask less. And indexation never happens by itself: the landlord has to request it in writing.
The health index of the month before the anniversary of the lease taking effect. For a lease that started on 1 November, that's October's figure every year.
In Flanders, for leases from 2019, it is the month before the lease took effect; in Brussels and Wallonia (and for older Flemish leases) the month before it was signed.
That depends on the region and on when the lease started. Flanders and Brussels apply a correction factor to older leases, Wallonia a new base rent, and in Brussels the rent cannot be raised without an EPB certificate. The calculator applies it and names the rule.
No. The calculation happens in your browser. What you enter is only in the page's address, so you can share the link; names for the letter never go there.
No. Huurindex applies the published rules and shows the source of each rule. In case of doubt or a dispute, ask your region's housing service, or the justice of the peace decides.
The same sum for tenant and landlord, with the source of every step.