October's CPI Stands at 4.9%: What Happens to Rents?

The National Statistics Institute (INE) published on 30 October 2026 the provisional Consumer Price Index (CPI) indicator, placing the year-on-year variation rate at 4.9%, the same figure recorded in September 2026. Meanwhile, the estimated core inflation —which excludes unprocessed food and energy products— remains unchanged at 3.1%. This figure defines the economic scenario for rent revisions corresponding to the end of this period.

What's Changing

The INE's provisional indicator reflects a stabilisation of the general CPI at 4.9% year-on-year during October 2026, with a monthly rebound of 0.6% compared to September 2026. Similarly, the Harmonised Consumer Price Index (HICP) places its estimated year-on-year variation at 4.9%.

According to the INE, the determining factors in price evolution during this month show contrasting dynamics:

• Downward factors: a decrease in fuel and lubricant prices for personal vehicles, accompanied by a containment in food and clothing compared to October of the previous year.
• Upward factors: an increase in prices for tourist packages, gas supply, and liquid fuels, such as heating oil.

Who it Affects

The direct impact of this 4.9% is not uniform across the rental market. It affects differently depending on the nature of the property and the date the contract was formalised:

• Primary residence contracts prior to 26 May 2023: those residential leases signed before the entry into force of Law 12/2023 on the right to housing that maintain an express update clause linked to the general CPI apply this reference in their annual review.
• Leases for uses other than housing: contracts for commercial premises, warehouses, and offices are not subject to the limits of residential legislation. If the contract stipulates revision by general CPI, the landlord can apply the full rate once the INE confirms the definitive data.
• Residential contracts regulated by the IRAV: for primary residences subject to the current legal framework, the update ceiling is not the CPI, but rather the Reference Index for Housing Lease Updates (IRAV). According to the data published by the INE in September 2026, the IRAV stood at 2.54%, decoupling the increase in residential rent from general inflation.

Numerical Update Example

Let's take an illustrative example of a monthly rent of 800 euros, for which the annual review is due with reference to October's CPI:

• Contract subject to general CPI (4.9%): the increase is 39.20 euros per month (800 × 0.049). The new monthly rent is set at 839.20 euros.
• Contract subject to IRAV (2.54% in September 2026): the increase is 20.32 euros per month (800 × 0.0254). The new monthly rent stands at 820.32 euros.

What it Means if You Own a Property in Catalonia

The provisional data published by the INE corresponds exclusively to the national average; Idescat and the INE will publish the territorial breakdown with the definitive data by mid-November 2026.

In Catalan municipalities declared as areas of strained residential market (ZMRT) by the Department of Territory of the Generalitat de Catalunya and approved by the Ministry of Housing and Urban Agenda (MIVAU) —a situation in which the main towns of Vallès Oriental and Occidental, such as Terrassa, Sabadell or Granollers, are found—, the CPI does not intervene in determining rents for new residential contracts. In these cases, the rent is fixed by the preceding contract or by the state reference system for rental prices.

However, for owners of commercial premises in these regions, an update clause based on the CPI does allow the full 4.9% to be passed on to the tenant once the final official data is published.

What to Do Now

1. Review the contract signing date: check if the contract is governed by the previous LAU or if it is subject to the current update limitations set by the IRAV.
2. Check the exact revision clause: verify if the contractual agreement requires waiting for the consolidated data and which reference month is used (usually, the one published two months before the annual expiry).
3. Wait for official confirmation: do not apply increases with the provisional data. It is mandatory to wait for the INE's definitive publication in mid-November to formalise the exact calculation.
4. Notify through reliable means: communicate the increase in writing before issuing the invoice corresponding to the new contractual period.

What is Still Unknown

The INE will confirm the definitive CPI data for October 2026 in mid-November. Until that date, neither the definitive figures nor the disaggregated territorial variation for Catalonia and the province of Barcelona will be known.