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Compute an indexed French commercial rent from your two index values, the one in your lease and the latest published quarter. The tool applies the indexation, caps it when a symmetrical ILC tunnel clause exists, and tells you which index the law attaches to your lease.
Compute the revised rent from the reference index and the revision index.
Cap the variation when the lease carries a symmetrical ILC tunnel clause.
Check that the index written into the lease is the one the law retains.
The calculation is one line: current rent multiplied by the ratio of the two index values. What is actually argued is the index retained, the period compared and the drafting of the clause. That is where this tool stops you, rather than letting you compute on an index that has no business being in your lease.
For a lease signed or renewed since 1 September 2014, the capping of the three-yearly review and of the renewed rent is measured on the ILC or the ILAT, never on the ICC.
Article L. 145-38-1 of the French commercial code, created by law no. 2026-403 of 26 May 2026, expressly allows a clause capping the annual ILC variation used for the rent review.
INSEE publishes a new quarter every three months. A series frozen into a tool goes stale silently, and a wrong index produces a wrong rent that nobody notices.
A correct calculation on a fragile clause is worthless: the indexation clause is the first document to re-read.
On a rent review, the calculation comes last. We start with the clause: the index stipulated, the reference period, the symmetry of any cap and the effective date. A clause comparing two periods of different lengths, or capping only increases, weakens the whole indexation, including the years already applied.
Applying indexation on the wrong index for several years. The correction then runs both ways, with a catch-up or a refund, and a limitation-period discussion neither party had anticipated.
For a lease signed or renewed since 1 September 2014, capping is measured on the ILC for commercial and craft activities, and on the ILAT for other tertiary activities including liberal professions. The ICC no longer appears there since the law of 18 June 2014, although it remains a lawful escalation index in an agreement relating to a built property.
Revised rent = current rent multiplied by the revision index divided by the reference index. Both values are read from the lease and from the INSEE publication for the relevant quarter. The result then applies according to the clause, on the date it provides for.
It caps the annual variation of the index, for instance between minus 3% and plus 3%. Since 28 May 2026, article L. 145-38-1 of the commercial code expressly allows it for the ILC, provided it works in the same proportions upwards and downwards. A clause capping only increases is deemed unwritten.
No, deliberately. It applies an indexation and flags the rules that govern the choice of index, but the exact drafting of your clause decides the period retained, the effective date and how the cap works. A badly drafted clause can be deemed unwritten, in which case there is no indexation at all.
Rules up to date as at 14 August 2026. Index values are not stored in the tool: the latest published quarter as at 14 August 2026 is Q1 2026, published on 24 June 2026.
We re-read the clause, recompute the revisions already applied and quantify the gap, before any discussion with the landlord or the tenant.