The annual rent review is one of the most important financial aspects of rental management in France. Unlike many countries where rent increases are negotiated freely, French law ties residential rent adjustments to the Indice de Reference des Loyers (IRL) — a quarterly index published by INSEE. Understanding how it works, when to apply it, and what procedures to follow is essential for every landlord.
What Is the IRL Index?
The IRL (Indice de Reference des Loyers) is a benchmark index published every quarter by the French national statistics institute (INSEE). It reflects changes in the cost of living, excluding tobacco and rent, and serves as the sole legal basis for annual rent adjustments in residential leases.
Key facts about the IRL:
- Published four times a year (Q1, Q2, Q3, Q4)
- Based on the consumer price index, excluding tobacco and rents
- Used nationwide for all residential rental agreements
- Applied only if the tenancy agreement contains an explicit rent review clause
Without a rent review clause in the tenancy agreement, the landlord cannot increase the rent during the lease — regardless of IRL changes. This is why including the clause at the time of drafting is critical.
How to Calculate the Rent Review
The formula for calculating the revised rent is straightforward:
New Rent = Current Rent x (New IRL / Reference IRL)
Where:
- Current Rent = the rent before revision (excluding charges)
- New IRL = the IRL value for the quarter specified in the lease (or the most recently published quarter)
- Reference IRL = the IRL value for the same quarter of the previous year
Worked Example
Let us walk through a concrete calculation:
- Current monthly rent: 850 euros
- Reference quarter: Q2 (as stated in the lease)
- IRL Q2 2025: 145.47 (example value)
- IRL Q2 2024: 143.58 (example value)
New Rent = 850 x (145.47 / 143.58) = 850 x 1.01316 = 861.19 euros
The landlord may increase the rent to 861.19 euros per month, representing an increase of approximately 1.32%.
Which Quarter to Use?
The tenancy agreement should specify the reference quarter. If it does not, the applicable quarter is the last published IRL at the date of signing the lease. The revision applies on the anniversary date of the lease or on a specific date stated in the contract.
Procedures: Step by Step
Step 1: Verify Your Lease
Before anything, confirm that your tenancy agreement includes a rent review clause. Check which IRL quarter is referenced and when the revision date falls.
Step 2: Look Up the IRL Values
Visit the INSEE website or use a rental management software that tracks IRL values automatically. You need two values: the current quarter's IRL and the same quarter from the previous year.
Step 3: Calculate the New Rent
Apply the formula above. Always round to two decimal places. The new rent cannot exceed the result of this calculation — the IRL is a cap, not a minimum.
Step 4: Notify the Tenant
Send a written notice to the tenant informing them of the rent revision. The notice must include:
- The new rent amount
- The effective date of the change
- The IRL values used and the calculation
- Reference to the rent review clause in the lease
There is no legally prescribed format, but the notification should be sent by letter (registered or simple) or email. The tenant does not need to consent — the revision is automatic if the clause exists and the calculation is correct.
Step 5: Apply the New Rent
The revised rent applies from the revision date forward. The landlord cannot apply the increase retroactively for past months — only from the date of notification or the contractual revision date, whichever is later.
Important Limitations and Special Cases
Retroactivity Is Limited
If the landlord forgets to apply the revision on time, they can claim the increase retroactively, but only for one year maximum (since the 2022 law). Beyond that, the right to that year's revision is lost. This makes timely application essential.
Rent-Controlled Areas
In cities with rent control (encadrement des loyers) such as Paris, Lyon, Lille, and others, the revised rent cannot exceed the applicable rent cap. Even if the IRL formula produces a higher amount, the cap prevails.
IRL Cap During Inflation
During periods of high inflation, the French government has periodically capped IRL increases (as seen in 2022-2023 with a 3.5% cap). Always check for any active cap measures before applying your revision.
Furnished vs. Unfurnished
The IRL applies equally to both furnished and unfurnished leases, provided the tenancy agreement includes the revision clause. The calculation method is identical.
Automating Rent Reviews
Tracking IRL values, remembering revision dates, performing calculations, and sending notifications manually is manageable with one property. But as your portfolio grows, the complexity multiplies. Missing a deadline means losing the right to that year's increase permanently.
Rental management software like HelloRento automates the entire rent review process. The platform tracks IRL publications, calculates the new rent automatically based on your lease terms, and generates notification letters ready to send. You never miss a revision date, and every calculation is documented for your records.
Never miss a rent review again. Try HelloRento for free and let the platform handle IRL tracking, calculations, and tenant notifications automatically.