CPI at 2.3%: What Spain’s 2026 Rent Update Means for Property Owners and Tenants

How a 2.3% CPI reshapes rent reviews in real estate Spain

Inflation figures are boring until they affect your bank balance. For landlords, tenants and investors in real estate Spain, the January 2026 Consumer Price Index (CPI) of 2.3% is the number that will determine many annual rent adjustments. We explain how that percentage becomes a concrete euro figure, which contracts it applies to, and what to watch for if you own or rent property in Spain.

Quick takeaway

• Article 18 of the Urban Leases Act (LAU) allows annual rent updates only when the contract expressly agrees to one in writing.
• If a lease has a review clause but does not specify an index, the default is the Competitiveness Guarantee Index (IGC), yet most leases in practice use the CPI.
• For January 2026 the CPI and the new Rental Price Index (IRAV) both read 2.3%.

How rent reviews are governed under the LAU

Article 18 of the LAU sets the legal ground for rent updates on residential leases. Two legal facts every landlord and tenant must know:

• If the lease contains no clause allowing annual updates, the rent remains unchanged for the full term.
• If the lease allows an annual update but omits the index, the statutory benchmark is the IGC. In practice, most parties use the CPI instead.

That distinction matters. A missing technical phrase in a contract can shift which inflation gauge applies, and that can change annual income for a landlord or a tenant's monthly outlay.

CPI, IGC and IRAV: which index applies and when

Understanding the three indices is practical, not academic.

• CPI (Índice de Precios al Consumo / IPC)

  • Compiled monthly by the Spanish Statistics Institute (INE).
  • Measures price changes across a representative basket of goods and services.
  • Most rental contracts in practice rely on CPI for annual adjustments.

• IGC (Índice de Garantía de la Competitividad)

  • The statutory fallback when a lease includes a review clause with no index specified.
  • Less commonly used in everyday contracts but legally relevant.

• IRAV (Índice de Referencia de Arrendamientos de Vivienda)

  • Introduced for contracts signed after the new Housing Law (in force May 2023) and applicable from 1 January 2025.
  • Calculated by INE as the lowest of three annual rates: CPI, core inflation, and an adjusted average annual rate of change.
  • In January 2026 IRAV was 2.3%, the same figure as CPI that month.

Which index applies to you depends on the contract wording and the contract date. We walk through the scenarios below.

Timing rules and practical calculation: how the CPI figure is used

Two timing rules are regularly overlooked but are decisive:

• INE usually publishes final CPI data on the 15th of each month.
• For lease updates tied to CPI, the figure applied is the CPI published two months before the anniversary review date.

Why two months? Rent is usually payable in the first days of the month while INE finalises data mid-month. Using the figure published two months earlier avoids last-minute recalculations and gives landlords time to notify tenants.

Practical calculation steps

1. Start with the current monthly rent.
2. Convert the CPI percentage to a decimal (for example, 2.3% = 0.023).
3. Multiply the current rent by that decimal to obtain the increase.
4. Add that amount to the current rent to get the new monthly payment.

Example: a real contract worked through

• Current rent: €1,200 per month
• January 2026 CPI: 2.3%
• Increase: €1,200 x 0.023 = €27.60
• New rent: €1,227.60 per month

The landlord must give the tenant at least one month's notice before the new rent takes effect.

The INE also provides an online calculator where you can input the current rent and the relevant CPI figure to obtain the updated amount quickly.

Historical constraints and exceptions: 2022–2024 caps and contract dates

The law has not been static. Between 1 April 2022 and 31 December 2024 the CPI was effectively sidelined by temporary legal caps on rent rises:

• 2022 and 2023: maximum increase 2% per year.
• 2024: cap increased to 3%.
• If the CPI was lower than the cap in any of those years, landlords had to use the lower CPI figure rather than the ceiling.

What this means for updating a contract in 2026 is that the date the contract is reviewed matters. Any contract reviewed in the capped period had its update governed by those temporary rules. Since 1 January 2025, contracts signed after the Housing Law entered into force have used IRAV.

How the choice of index affects returns and affordability

Indexes are not neutral for investors or tenants.

For landlords and investors:

• Tying rent to CPI generally preserves real income when inflation is rising, although CPI can lag local market rents.
• Using IRAV can be more restrictive because it takes the lowest of three rates; this can limit upside in higher inflation spells.
• Failing to specify an index exposes you to the IGC default, which may be less favourable or predictable.

For tenants and affordability:

• A CPI link means rent moves with general inflation, which can erode tenants’ real income if wages lag.
• IRAV’s design is more tenant-friendly because it selects the lowest measure, which can cap increases during inflationary episodes.

Practical investor takeaway: indexing clauses are part of yield management.