Spain’s rent index reached its highest reading on record in September, and most landlords still cannot pass it on. On 14 October 2026 the National Statistics Institute published the Índice de Referencia para la Actualización de Arrendamientos de Vivienda, the IRAV, at 2.54% for the year to September, up from 2.47% in August and the highest figure since the series began in November 2024.
Under the tenancy law that number sets the ceiling for an annual rent review. A decree published in the official state gazette on 7 October 2026, and in force since the following day, cuts across it: for any update falling between then and 31 December 2027 the increase is capped at 2% unless owner and tenant agree otherwise, and where the rent already sits above the reference price ceiling there is no increase at all. For an agent valuing a let flat, 2% is the number to model, not 2.54%.
What Spain’s Rent Index Says for September
INE publishes the index every month, and it is the reference for annual updates on contracts signed since the housing law of May 2023. September’s 2.54% is not a spike but the top of a narrow band: the index ran at 2.49% in July, 2.47% in March and in August, 2.44% in June, 2.32% in December 2025 and 2.14% in January 2026. It is the highest of the 23 monthly readings published since November 2024, and none of them has fallen below 1.98%.
What the index measures is rent inflation itself rather than consumer prices, and it arrives with a lag: the September figure landed on 14 October. Article 18.1 of the tenancy law says the annual update cannot exceed the variation in the IRAV at the date of the review, taking the last index published at that moment. An owner reviewing a rent this month therefore works from the September reading of 2.54%, because that is the latest one on the record.
Why Most Rent Updates Cannot Follow the Index
The limit that bites sits in the package the government pushed through in the first week of October. Disposición final sexta of Real Decreto-ley 29/2026 governs updates that fall due between its entry into force and 31 December 2027. Where the rent is above the maximum price that applies under the reference price system, which exists in designated stressed market areas, no increase is allowed at all. In every other case the increase is whatever the parties agree in a new pact, and where there is no new agreement the increase cannot exceed 2%.
In practice the index is a ceiling an owner cannot reach alone. Raising a rent by the full 2.54% needs the tenant’s agreement, and a tenant sitting on a rent below the reference ceiling has little reason to give it. An official calculator from the Ministry of Housing returns the maximum increase for a contract, and its reference price tool at serpavi.mivau.gob.es shows whether the flat sits above the applicable ceiling. In euro terms the gap is small and steady: on a rent of €900, a 2% increase adds €18 a month, against €22.86 under the full index, a difference of €58.32 across a year.
Who the Two-Year Rent Extension Now Covers
Disposición final quinta of the same decree hands tenants a new right to stay. Where the mandatory extension period under article 9.1 of the tenancy law ends before 31 December 2028, or where a tacit extension or a tacit reconduction ends, and the tenant has paid on time in each of the previous eight months, the tenant can ask for an extraordinary extension of up to two more years on the same terms. Acceptance is mandatory unless the parties have agreed other terms, a new contract has been signed, or the owner has already notified the tenant that the home is needed for themselves or a close relative.
Two limits are worth carrying into a conversation with an owner. It cannot be stacked on the three-year extension that applies in stressed market areas, which takes precedence where it applies. And it drops away entirely when owner and tenant agree a renewal, or a new contract, at a rent at least 5% below the one in force.
What the Numbers Mean for a Rental Purchase
A buyer taking on a tenanted flat is buying a stream of rent, and that stream now grows more slowly than the index suggests. Rents are capped, house prices are not, so a purchase on the Spanish property market is priced on the flat itself while the income it produces is held back. Model 2% a year to the end of 2027 rather than the 2.54% the index prints, and read the contract before modelling anything, because a rent that sits above the reference ceiling for its area cannot be updated at all, whatever the index says.
| Measure | Latest figure |
|---|---|
| IRAV rent index, September 2026 | 2.54%, the highest in the series |
| IRAV rent index, August 2026 | 2.47% |
| Maximum annual update, 8 October 2026 to 31 December 2027 | 2% without a new agreement |
| Update where the rent is above the reference price ceiling | no increase at all |
| Extraordinary extension on the tenant’s request | up to two more years |
| Rent reduction that removes the extension | 5% or more below the current rent |
Three things to hold on to when the numbers go into a spreadsheet:
- The index of 2.54% is the legal ceiling on a review, not a rate an owner can simply apply.
- That 2% is what an owner can apply without a fresh agreement, and it runs to the end of 2027.
- On a €900 rent the difference is €4.86 a month, small on its own and steady for fifteen months.
A Checklist for Agents Pricing Spanish Rentals
Most of the work sits in the contract rather than in the market. Five checks before you quote a net yield on a Spanish let:
- Find the review clause and its date. An update due between 8 October 2026 and 31 December 2027 falls under the 2% limit; after that the IRAV returns as the sole ceiling.
- Check the reference price for the address in the ministry’s SERPAVI tool. A rent above the ceiling cannot be updated at all under the decree.
- Run the contract through the ministry calculator before promising an owner an increase in writing.
- Ask whether the tenant has paid on time for the previous eight months, because that is the condition for the two-year extension.
- If the owner needs the flat back, use the notification in article 9.3 of the tenancy law instead of relying on the contract end date.
Where Spanish Rents Are Heading Before 2028
The index will keep moving and the cap will keep biting. Reporting on the package is already mixed: The Local Spain reported on 14 October that the National Federation of Real Estate Associations found 88.9% of some 600 agencies surveyed reporting disruption, with 5,758 transactions affected in ten days and 56% of agencies saying some homes meant for rent are being sold instead. Both decrees are still awaiting confirmation by a parliament that is dissolved until the 29 November election, so the rules in force now are the ones to work with, and the rental market is adjusting to them week by week.
For a buyer the position is narrow and clear. The home is still the asset, the index is still the headline, and until the end of 2027 the figure that decides what a tenant pays is 2%.
Questions Agents Ask About Spain’s Rent Cap
These come up as soon as an owner asks for an increase.
Can a landlord raise the rent by 2.54% in Spain?
Not unilaterally. The IRAV sets the legal ceiling for an annual update, but the October 2026 decree limits increases due between 8 October 2026 and 31 December 2027 to 2% unless owner and tenant agree a different figure in a new pact. Where the rent is above the reference price ceiling, no increase applies at all.
What is the IRAV and who publishes it?
IRAV stands for Índice de Referencia para la Actualización de Arrendamientos de Vivienda, published every month by Spain’s National Statistics Institute. It replaced the consumer price index as the default reference for annual rent updates. The September 2026 reading, published on 14 October, was 2.54%.
Does the cap apply to short-term and seasonal lets?
That corner is closed by the same decree. Where several temporary contracts are signed in succession on the same dwelling, the rent on each later contract cannot rise by more than the IRAV in force, which closes the gap that let some owners reset a rent with a fresh seasonal agreement.
Can an owner still end a tenancy to sell or move in?
Yes, but through the notification in article 9.3 of the tenancy law, which has to be served before the contract ends and on the ground that the home is needed for the owner or a close relative. A request for the two-year extraordinary extension can be refused when that notification has already been given.
Where do I check the maximum increase for a contract?
A calculator from the Ministry of Housing at mivau.gob.es takes the current rent, whether it sits above the reference price and the contract end date, and returns the maximum increase. Its SERPAVI tool gives the reference price range for the address.
