Rent calculators
French rent increase calculator: revise on the IRL before the year runs out.
France lets you raise the rent once a year by the published index, takes the year away entirely if you claim it late, refuses it outright on a poor energy rating, and lets you back claim nothing at all.
It fixes the anniversary, and where an index applies, the starting index.
The anniversary you are claiming.
The one named in the lease, not the latest one published
A poor rating blocks or dampens the rise in some places
The Quarter 1 figure from one year before the one for this revision, on the same series.
The latest Quarter 1 figure published by the revision date.
Type the two index figures and the answer appears here. Dardaris holds no copy of the series, so it works from the figures you enter and shows them in the working.
What governs in France
- Index
- IRL, Indice de référence des loyers (INSEE), published quarterly
- Formula
- new rent = current rent × IRL of the reference quarter this year ÷ IRL of the same quarter last year
Nothing is stored and nothing is sent. This runs the same calculation engine the product itself runs, in this browser.
What the rules actually say
The rules Dardaris applies in France.
Every line below is read off the same jurisdiction pack the product runs on, and each one says whether anybody has confirmed it in a source.
- Index
IRL, Indice de référence des loyers (INSEE), published quarterly
A twelve-month average of consumer prices excluding tobacco and rents.
Confirmed in a primary source
- Formula
new rent = current rent × IRL of the reference quarter this year ÷ IRL of the same quarter last year
France indexes the CURRENT rent, not the original one, the opposite of the Belgian rule. Do not reuse the Belgian base-rent logic here.
Confirmed in a primary source
- Notice
A written demand is required
You must claim it. Nothing happens automatically.
Confirmed in a primary source
- Back claim
Nothing can be back claimed
No catch-up at all. Claim within twelve months of the revision date or the whole year is forfeited (art. 17-1 I). This is the mirror image of the Belgian three-month rule.
Confirmed in a primary source
The questions that follow.
- How is a rent revision calculated in France?
- The new rent is the rent currently paid multiplied by the IRL of the reference quarter this year and divided by the IRL of the same quarter last year. The quarter is the one the lease names, not the most recent one published.
- What happens if I forget to claim a revision?
- The year is lost outright. Article 17-1 I gives you twelve months from the revision date, and after that the whole year is forfeited. This is the opposite of the Belgian rule, where a late demand still recovers three months.
- Can I revise the rent on a dwelling rated F or G?
- No. Since 24 August 2022 the rent of a dwelling rated F or G on the DPE cannot be revised at all in metropolitan France, whatever the lease says. Renovating to a better class is the only route back.
- Do I index the original rent or the rent being paid now?
- The rent being paid now. France applies the ratio to the current rent, so revisions compound. Belgium applies its ratio to the original base rent, which is why a Belgian method used on a French lease undercharges.
The same calculator, under other law.
A rent rises differently in each of these, and the page for each one says how. Anywhere else, the calculator still runs on that jurisdiction's own pack.
The calculation takes a minute. The date is what costs you.
Nobody forfeits a year because the arithmetic defeated them. They forfeit it because the anniversary fell in a quiet month, the index was not out yet, and by the time it was, there was nothing to remind them.
- It watches the anniversary for youDardaris holds the lease, its reference quarter and its anniversary, and tells you a revision is due rather than waiting to be asked.
- And works it out on the right two figuresThe reference quarter the lease names, against the same quarter a year earlier, applied to the rent in payment. The DPE block and the twelve month window are part of the same answer.
- But it does not send itA letter that raises somebody's rent waits for you. Dardaris prepares it and says what it is based on, and you are the one who decides it goes.
The number is the easy part.
Dardaris keeps the lease, raises the invoice, matches the payment and writes down what it did. Bring one building and watch a month before you decide anything.
14 days before the first charge · Nothing is switched on until you say so