How do you use the IRL to increase a rent?
A French residential lease states a reference quarter. Every year on the review date, you compare the IRL for that quarter with the IRL for the same quarter of the previous year: new rent = current rent × new IRL ÷ old IRL. The rent increase calculator does this for you.
Example: with Q3 as the reference, an increase requested at the end of October 2025 compares the IRL for Q3 2025 (145.77) with the IRL for Q3 2024 (144.51), i.e. an increase of 0.87%.
Good to know
- The IRL is a cap: the landlord can apply a smaller increase, or none at all.
- It only applies to homes let unfurnished or furnished as the tenant's main residence. Commercial premises use other indices (ILC, ILAT).
- Rent for homes rated F or G on the energy performance certificate (DPE) can no longer be increased.
All the details are in our guide to rent increases.
Frequently asked questions
What is the IRL?
The rent reference index (indice de référence des loyers) is published every quarter by INSEE, the French statistics office. It reflects the average change in consumer prices, excluding tobacco and rent, over the last twelve months. It caps the yearly increase of residential rents in France.
When is the IRL published?
Every quarter, around the middle of the month after the quarter ends: mid-January for Q4, mid-April for Q1, mid-July for Q2 and mid-October for Q3.
Which quarter applies to my lease?
The one stated in the lease's rent review clause. Failing that, the reference is the latest IRL published on the date the lease was signed, and the same quarter is used in the following years.
Why are some IRL values from 2022 to 2024 capped?
The law of 16 August 2022, extended in 2023, capped the yearly change of the IRL at 3.5% in mainland France for the indices from Q3 2022 to Q1 2024 (the 'rent shield'). The values published by INSEE for that period already include this cap for mainland France; different caps applied in Corsica and overseas.
Updated 8 October 2026. This tool gives general information about French tenancy law and doesn't replace personal legal advice.