📈 Can my rent be indexed in Belgium?

With conditions

Quick answer

Yes — once a year, with the legal formula, and only if your energy label allows it. Indexation requires a written (and registered) lease that doesn't exclude it, applies at most once a year from the lease anniversary, and always follows the health-index formula — never a freely chosen percentage. Since the energy crisis the EPC is the referee: in Brussels a home labelled F or G cannot be indexed at all and label E only by half; in Flanders every label may index again since October 2023, but contracts predating 1 October 2022 with label D, E, F or no EPC carry a permanent correction factor capping the increase. Overcharged? The excess is recoverable. Check every indexation letter against Statbel's official rent calculator.

📋 The rules

Max once a year, at the earliest on the lease anniversary
Legal formula using the health index — no free percentage
Brussels: EPB F/G = no indexation, E = half; registered lease required
Flanders: correction factor for pre-1/10/2022 leases labelled D/E/F/none
No retroactivity: arrears claimable max 3 months back

🔓 Exceptions

Lease expressly excludes indexation: then it's never allowed
Verbal or unregistered leases: the indexation right wobbles (region-dependent)

⚠️ Penalties & fines

Wrongly or incorrectly indexed: the overpayment is recoverable (up to 5 years via the justice of the peace). A landlord indexing without a valid EPC where required loses the indexation right for that period.

📎 Official sources

Last verified: 2026-06-20

❓ Frequently asked

My landlord indexes 2 years at once. Allowed?

He may apply indexation from the anniversary date but claim arrears only 3 months back — 'forgotten' years don't fully stack.

How do I verify the amount?

Statbel's rent calculator: enter base rent, starting index and new health index — if the letter differs, the legal formula wins.

My Brussels flat is EPB label F. Indexation?

No — with label F or G indexation is blocked in Brussels until the label improves; label E allows only half.

Does the Flemish correction factor hit my 2023 lease?

No — leases signed from 1 October 2022 index fully regardless of label; the factor only touches older contracts labelled D/E/F or without an EPC.

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