Rent Increase During Tenancy in France: Rules, IRL Caps & Calculations

Sooner or later, most tenants in France receive a version of the same email: "From next month, your rent will increase from €2,800 to €2,850." If you grew up renting in the United States or the United Kingdom, your first instinct may be that the landlord simply decided the market went up. In France, that instinct is wrong. The maximum increase is set by a government index, not by the landlord, and the conditions attached to it are precise.

The difficulty for international tenants is not the rule itself. It is the wording. The legal basis sits in a French lease clause, references a quarterly index called the IRL, and uses terms like révision annuelle and trimestre de référence that rarely come with a translation.

This guide explains when a rent increase during a tenancy is legal, how to calculate the correct amount, what blocks an increase entirely, and what to do if the figure on your notice looks wrong. It covers standard residential tenancies under the loi du 6 juillet 1989, with a dedicated section on Paris. By the end, you should be able to answer five questions: is the increase allowed, does my lease permit it, which IRL applies, what should the new rent actually be, and what is my next step if the landlord's figure is off. One idea runs through all of it: a small increase is not automatically a legal increase.

Not freely, no. Under the loi du 6 juillet 1989, the French law governing residential tenancies, only three mechanisms can ever raise the rent of a sitting tenant, and only two of them apply while the lease is running.

The three legal grounds under the 1989 law

The law recognises exactly these situations:

• Annual IRL revision. The most common route. It requires a revision clause in the lease and is capped by the change in the IRL index. This is the mechanism behind almost every mid-tenancy increase in France.
• Improvement works. A landlord who pays for genuine improvements, such as new double glazing or a modern heating system, can apply an agreed rent uplift. This only works if the increase was agreed in writing, either in the original lease or in a signed amendment (an avenant).
• Manifestly under-priced rent. If the rent is clearly below comparable local rents, the landlord can propose a realignment. This route exists only at lease renewal, never during the active term. We cover it later in the renewal section.

Outside these three cases, any increase is void. The tenant can refuse it, and if it was already paid, claim the overpayment back.

What makes an increase illegal from day one

Some increases fail before any calculation is checked. An increase is not valid if:

• the lease contains no revision clause;
• the calculation uses the wrong IRL quarter, or the latest index instead of the lease's reference quarter;
• the increase is applied retroactively to past months;
• it is the second revision within the same twelve-month period;
• the property is rated F or G on the DPE and the freeze applies;
• the only justification offered is that "market prices went up." Market movement is never a legal ground during a tenancy.

If your notice matches any of these, the problem is not the amount. It is the legal basis itself.

Before checking any calculation, confirm which lease you signed, because every rule in this guide depends on it.

This step is skipped by most general guides, and it matters most for the readers who can least afford to skip it: employees on assignment, diplomatic staff, and anyone whose employer signed the contract.

1. Standard residential leases under the 1989 law

Three lease types fall under the protective framework of the loi du 6 juillet 1989.

Unfurnished lease (bail nu)

The three-year standard lease. The annual IRL revision applies if, and only if, the lease contains a revision clause. No clause means the rent is fixed until renewal.

Furnished lease (bail meublé)

The one-year furnished lease most international arrivals sign. Same rule: revision is possible with a clause, capped by the IRL, once per year.

Bail mobilité

Here is the detail that catches many people out. The bail mobilité, the flexible one-to-ten-month lease, sits inside the 1989 framework but its rent cannot be revised during the lease at all. Since the contract runs for under a year, the annual IRL mechanism never applies. Whatever rent you signed is the rent you pay until the end.

2. Non-standard arrangements common among expats

Company leases and the bail Code civil

When a company rents an apartment to house an employee or director, or when the property is not the tenant's primary residence, the contract is often a civil code lease. These sit outside the loi du 6 juillet 1989 entirely. There is no automatic IRL cap and no Paris rent ceiling. The indexation terms are whatever the contract says, which makes reading that clause before signing far more important than under a standard lease. One caution: a civil code lease used incorrectly for a private individual's primary residence risks being requalified by a court as a standard 1989 lease.

Embassy and diplomatic housing

Diplomatic tenancies typically use the civil code structure described above, negotiated between the mission or the employer and the landlord. The practical consequence is the same: your protection comes from the contract wording, not from the statute.

For a full comparison of durations, deposits, and exit rules, see our guide to the four lease types in France.

Case scenario 1: when an embassy lease does not follow the IRL rules. An American executive rents a furnished three-bedroom in the 16th arrondissement under a company lease. The contract includes a fixed 2% annual indexation, higher than the current IRL. Is it legal?

Yes. The lease sits outside the 1989 framework, so the contractual rate stands. The lesson is not that company leases are bad. It is that the indexation clause should be negotiated before signature, because no index will cap it afterwards. Illustrative scenario based on common expat rental situations.

The entire mechanism comes down to one line of arithmetic that the landlord must get exactly right. The IRL, the Indice de Référence des Loyers, is published every quarter by INSEE and tracks consumer prices excluding tobacco and rents. Your lease names one quarter as its reference. That quarter, compared with the same quarter one year earlier, sets your maximum increase.

The IRL formula landlords must use

The standard annual revision formula

New rent = current rent (excluding charges) × new IRL ÷ IRL of the same quarter one year earlier

Three inputs, nothing else:

• Current rent: the monthly loyer hors charges, meaning rent before recoverable service charges. The percentage never applies to charges.
• New IRL: the index for the reference quarter written in your lease. If the lease names no quarter, the last IRL published at the time of signing applies.
• Previous IRL: the same quarter, one year earlier.

The result is the ceiling. A landlord can always apply less, and in a quiet market some do, but never more.

Worked example: checking a €50 rent increase

Return to the email from the introduction. Rent of €2,800 excluding charges, a lease whose reference quarter is Q2, and a landlord asking for €2,850. Here is the check, step by step.

Step 1: find the reference quarter

Open the lease and locate the revision clause. It states the trimestre de référence, in this example the second quarter (T2).

Step 2: find both IRL values

From the INSEE figures published in July 2026: Q2 2026 IRL is 148.37 and Q2 2025 IRL is 146.68.

Step 3: apply the formula

€2,800 × 148.37 ÷ 146.68 = €2,832.26. That is the maximum legal rent after revision.

Step 4: compare with the landlord's figure

The landlord asked for €2,850. The difference is €17.74 per month, which is €212.88 over a year. The extra amount has no legal basis. Seventeen euros sounds trivial in a €2,800 lease, and that is precisely why overcharges like this go unchallenged. But the landlord does not get to choose the figure. The index does.

If you would rather see the calculation performed on screen before running your own, this short French walkthrough shows a landlord applying the IRL revision step by step. The commentary is in French, but the on-screen figures follow exactly the formula above, so the numbers speak for themselves.

What if the landlord applies the revision late?

The revision is not automatic, and timing has real consequences. Picture a lease with a 1 January revision date where the landlord only writes on 1 April:

• January to March: the old rent remains payable in full.
• From 1 April: the correctly revised rent applies, calculated with the lease's reference quarter.
• Never: retroactive collection for January to March. Back-dating is prohibited.

And if the landlord lets a full year pass without asking? That year's revision is lost permanently. It cannot be added to next year's increase. Service-Public confirms the landlord loses the benefit of a revision not requested within one year of its due date.

Common IRL calculation mistakes

Most disputed revisions fail on one of five recurring errors:

• using the latest published IRL instead of the lease's reference quarter;
• applying the percentage to rent including charges;
• back-dating the increase to the anniversary after asking late;
• requesting a second revision within the same year;
• rounding up beyond the two-decimal result.

If you spot one of these, you have found your answer before any negotiation starts.

The 2025 and 2026 values in the table below are historically low. After the inflation peak of 2022 and 2023, when a temporary "bouclier loyer" capped IRL variation at 3.5%, annual changes have stayed near or below 1% since late 2025. For a €2,800 rent, the difference between quarters is a few euros per month, but the principle stays the same at any amount: the index decides, not the landlord.

Even a perfectly calculated increase can be void. Three blockers stop a mid-tenancy increase entirely, and a fourth situation, works-based increases, follows its own separate track.

No revision clause means the rent is frozen

If the lease is silent on revision, the rent cannot move until the lease is renewed. Full stop. This is worth checking before anything else, because a surprising number of older leases and informal contracts have no clause at all.

How to find the revision clause in a French lease

Search the lease (Ctrl+F works on a PDF) for these phrases:

• révision du loyer or révision annuelle
• clause d'indexation
• indice de référence des loyers or IRL
• trimestre de référence

A typical clause states, in substance, that the rent will be revised each year on a given date according to the variation of the IRL, and names the reference quarter. If none of these phrases appear anywhere, there is a strong chance your rent is contractually fixed.

The DPE freeze on F and G rated homes, and the 2026 reform

Since 24 August 2022, rent on properties rated F or G on the DPE energy certificate cannot be increased at all in metropolitan France. No annual revision, no increase at renewal, no increase between tenants. The freeze applies to leases signed, renewed, or tacitly renewed from that date, so it has progressively covered most running leases. Service-Public lists this among the situations where revision is prohibited outright.

The 2026 reform changed the picture for one group of properties. From 1 January 2026, the DPE calculation uses a lower conversion coefficient for electricity (1.9 instead of 2.3). By government estimates, around 850,000 mainly electrically heated homes left the F and G categories without any works. Where the recalculation improves the label, an existing DPE can be updated under the new methodology, via an official attestation, without a fresh inspection. For those properties, the freeze lifts and the normal IRL revision right returns.

The practical takeaway for tenants: before accepting any 2026 increase on a previously frozen flat, ask to see the current, updated DPE class. For landlords, the same document is what makes your revision defensible.

Notice and deadlines: how and when the landlord must inform you

The written notice

The law sets no rigid template for an IRL revision notice. In practice, a clear notice should identify the two IRL values used and show how the new rent was calculated. A verbal mention or a one-line message with a new amount and no calculation gives you every reason to ask for the figures before paying.

The one-year window

The revision can be applied once per year, on the date stated in the lease or, if none is specified, at the end of each year of the lease. The landlord then has one year from that date to act. Ask late, and the increase runs only from the request date. Miss the window entirely, and the year's increase is gone for good.

Can renovation works justify a separate increase?

Yes, but through a different door, and never unilaterally.

• The annual IRL revision: Covers ordinary inflation adjustment. Formula above, clause required.
• The improvement-works increase: Covers genuine upgrades the landlord funds. Under article 17-1 of the 1989 law, a mid-lease works increase requires the tenant's prior written agreement on the nature of the works and the amount, formalised in an avenant. So if your landlord installs a new heating system and proposes an extra €80 per month, that figure is not an IRL matter. It stands or falls on what was agreed in writing. Routine maintenance, a repaint or replaced flooring, does not qualify as improvement at all.

Paris adds a second system on top of everything above, and understanding where each one applies will save you from a common confusion. The encadrement des loyers, in force since July 2019 and set by a prefectural order (the current one dated 12 June 2026, applicable from 1 July 2026), caps rents through a loyer de référence majoré, a maximum per square metre that varies by neighbourhood, room count, construction period, and furnished status. Depending on the profile, the 2026 ceilings range from roughly €18 to €52 per square metre.

Two systems, two different checkpoints

Here is the distinction most guides blur. The Paris ceiling controls the base rent set when the lease is signed or renewed. The annual IRL revision is a separate mechanism that runs during the tenancy. In other words, the ceiling is checked at the start line, and the IRL is checked every year of the race. When you assess your own situation, you are really running two independent tests: was the base rent legal on signature day, and is this year's revision correctly calculated? An increase can be wrong on either count, and occasionally both.

Can a correct IRL revision take the rent above the Paris ceiling?

This is the question sophisticated tenants and landlords eventually ask, and the honest answer is that recent Paris case law leans yes. As the ADIL de Paris explained in its April 2026 analysis, article 140 of the loi ELAN caps the base rent at the moment the lease is concluded. On that reading, an annual IRL revision remains valid even where it carries the rent slightly above the current loyer de référence majoré, a position the Paris Court of Appeal adopted in a decision of 6 March 2025, following similar first-instance rulings in 2024 and 2025.

Two cautions belong next to that statement. Several guides, and even some automated summaries, state the opposite, and the case law is recent, so the position may still be refined. And none of this rescues a base rent that was illegal at signature: if the rent exceeded the ceiling on day one without a documented complément de loyer, the tenant can pursue a reduction and repayment regardless of any later revisions. The full mechanics of ceilings, zones, and supplements are covered in our guide to how Paris rent control caps work, and you can test any address in two minutes with the official simulator on paris.fr.

Three ceilings people confuse, in one paragraph each

The IRL cap limits the annual revision during a tenancy, nationwide, as described throughout this guide.

The national zone tendue decree caps rent between tenancies and at renewal in high-demand municipalities across France. Service-Public confirms this framework has been extended to 31 July 2027.

The Paris encadrement is the per-square-metre ceiling on the base rent in Paris (and a handful of other cities such as Lyon, Lille, Bordeaux, and Montpellier), checked at signature and renewal. Three different tools, three different moments. Mixing them up is the single most common error in English-language coverage of French rents.

Do not pay first and argue later. Verify, respond in writing, and escalate only if you need to.

Most incorrect revisions in Paris are resolved at the first written exchange, because once the correct calculation is on the table, there is nothing left to debate.

A five-step check before you reply

1. Check the revision clause

Confirm the lease actually contains one, using the search phrases listed earlier. No clause, no increase.

2. Find the reference quarter

Note the trimestre de référence named in the clause. This, not the latest INSEE release, is your index.

3. Recalculate the rent

Apply the formula to your rent excluding charges. The free simulator on Service-Public and the ANIL table give you official numbers to work from.

4. Check the property's DPE

If the current class is F or G, the revision right is frozen, whatever the calculation says. Ask for the up-to-date certificate, especially in 2026 when labels are moving.

5. Check any Paris-specific issue

Was the base rent legal at signature? If you suspect it exceeded the ceiling from day one, that is a separate and potentially larger claim than the revision itself.

Documents to gather and how to respond

Before writing back, have these to hand:

• the signed lease;
• your most recent rent receipt (quittance de loyer);
• the landlord's revision notice;
• the DPE;
• any previous revision notice.

If the figure checks out, a simple confirmation keeps the relationship smooth. If it does not, a short factual reply works better than a legal essay. In English: "Thank you for your notice. Based on the lease's reference quarter (T2) and the published IRL values (148.37 and 146.68), the revised rent comes to €2,832.26 rather than €2,850. Could you confirm the corrected amount?" In French, the same message opens with "Après vérification de la clause de révision et des indices IRL applicables". Not every landlord applies these rules the same way, and in our experience many overcharges are honest errors by owners using the wrong quarter (more common than agencies admit).

Escalating: conciliation and beyond

If the landlord insists on an incorrect figure, the Commission Départementale de Conciliation offers free mediation and resolves a large share of rent disputes without a courtroom. Beyond that, the tribunal judiciaire can void the invalid portion and order repayment of amounts collected without basis. Keep paying the undisputed rent throughout. Withholding rent entirely turns a strong position into a weak one.

Case scenario 2: the increase that looked illegal but was not. A British consultant rents a furnished one-bedroom for €2,200 excluding charges, plus a €150 flat-rate charge package (forfait de charges). Her lease contains an annual revision clause using Q2 as the reference quarter. The revision notice raises the monthly total from €2,350 to €2,377.08.

She first checks the rent alone:

€2,200 × 148.37 ÷ 146.68 = €2,225.35

That is an increase of €25.35. Yet the notice asks for €27.08 more each month. Because IRL revisions are normally calculated on rent excluding charges, she assumes the landlord has wrongly indexed the charges and prepares to dispute the increase.

The missing detail is the way her charges are structured. On a furnished lease, a flat-rate charge package (forfait de charges) can also be revised annually under the same rules as the rent. In this case:

€150 × 148.37 ÷ 146.68 = €151.73

The rent therefore rises by €25.35 and the charge package by €1.73, bringing the new monthly total to exactly €2,377.08. In this scenario, the €27.08 increase is correctly calculated.

If the lease had instead used provisions sur charges, with charges reconciled against actual expenses, the same IRL indexation would not apply to them. The takeaway is simple: before challenging an increase that looks slightly too high, check whether your lease says forfait de charges or provisions sur charges. On furnished leases, that distinction can explain why the total monthly payment rises by more than the rent alone.

Illustrative scenario based on common expat rental situations.

Renewal is the one moment an under-priced rent can be realigned, and the safeguards are heavy. During the tenancy, market value is irrelevant. At renewal, it briefly becomes relevant, under strict conditions.

The under-priced rent revaluation, spread over years

A landlord who believes the rent is manifestly below comparable local rents must propose the new figure at least six months before the lease term ends, supported by references to similar properties.

You then have four months to respond, and silence counts as refusal, sending the matter to conciliation. Even when an increase is accepted or ordered, it is phased in: one third per year over three years for private landlords, or one sixth per year over six years when the rise exceeds 10%. Nobody's rent jumps overnight at renewal.

Renewal in Paris follows its own rent-control track

In Paris, the DRIHL framework narrows this further. A landlord-side revaluation at renewal is only open where the current rent sits below the loyer de référence minoré, the reference rent minus 30%. And renewal cuts both ways: a tenant whose base rent exceeds the loyer de référence majoré can pursue a reduction. If your renewal is approaching, checking your position against the current prefectural schedule is worth thirty minutes of anyone's time.

For landlords, the real risk is rarely overcharging by intent. It is losing money due to missed procedures. The rules above are symmetrical: everything that lets a tenant verify an increase also tells an owner how to apply one that holds up.

Before and after sending the revision

Before the notice goes out

• confirm the lease contains a revision clause and note its exact date;
• identify the reference quarter and pull both IRL values from INSEE;
• verify the property's current DPE class, updated for the 2026 methodology if relevant;
• calculate on the rent excluding charges, to two decimals;
• draft a notice showing both indices and the arithmetic;
• the official landlord guide to revising a residential rent on economie.gouv.fr.

After it is sent

• keep the calculation and proof of sending;
• update your rent schedule and receipts to the new amount;
• never attempt retroactive recovery for months before the request;
• diarise next year's date, because the right does not carry over.

What missing one annual revision actually costs

Take a €2,500 monthly rent with a Q2 reference quarter. The 2026 revision adds 1.15%, or €28.75 per month, meaning €345 over the year. Miss the window and that €345 is gone permanently, and the loss compounds, because next year's revision starts from the lower base. Owners who let three revisions slip during the 2022 to 2024 cycle, when the capped index still ran at 3.5% per year, gave up well over €3,000 on a rent of that size. This is the quiet cost of self-managing from another country and another time zone. Our guides to property management fees and rules in Paris and managing a Paris property as an overseas landlord cover how professional management closes exactly this gap.

Many rent-increase problems are easier to avoid before a lease is signed. A revision clause that looks like a minor detail today can affect what you pay throughout a multi-year stay, especially if your family needs to remain close to a school, workplace or established routine.

As part of our property search service, Relocation in Paris supports clients through the rental process, including reviewing lease documents and helping clarify the terms before signature.

Key points to review before signing

A careful lease review should look beyond the monthly rent itself. In particular, it is worth checking:

1. The lease regime. Is it a standard residential lease governed by the 1989 law, or a different arrangement such as a civil code lease? If you are unsure how these contracts differ.
2. The revision clause. Check whether annual revision is allowed, the date on which it may occur, and the reference quarter used for the IRL. Civil code leases may contain different contractual indexation terms.
3. The starting rent. In Paris, the base rent may also need to be checked against the applicable rent-control rules.
4. The property's restrictions. The DPE rating, type of lease and other contractual details can affect whether and how the rent may change later.
5. The supporting documents. Keeping the signed lease, DPE, rent receipts and any future revision notices together makes it much easier to verify a rent increase if a question arises later.

Reviewing these points before signing gives tenants a clearer picture of how their rent may evolve and which rules apply to their particular contract. You can see the level of support available through our relocation packages.

Support beyond the apartment search

Questions can also arise after move-in, particularly when an agency sends a revision notice or the lease approaches renewal. Clients who have already reviewed their lease carefully start from a stronger position because the relevant clause, reference quarter and contract type are easier to identify when checking a future increase.

For property owners, our property management service provides ongoing support with tenant relations, rent collection and the day-to-day administration of the tenancy.

Digital reminders can help track important dates, but understanding how a clause applies to a particular lease, discussing unclear terms with an agency and deciding what to do next often requires a closer look at the contract itself.