How Much Can You Legally Raise the Rent in Spain?

A surprising number of disputes over rent increases come down to a single missed detail: whether the contract actually says the rent can be updated, and how. Under Spanish law, that detail decides everything.

No agreement, no update — full stop

Under Article 18 of the LAU (Ley de Arrendamientos Urbanos), rent may only be updated annually on the terms expressly agreed by the parties. If the contract doesn't include an update clause, the landlord cannot unilaterally raise the rent during the contract term — silence in the contract means no increase applies, not "the landlord decides."

If an update is agreed but no index is specified

If the contract says rent will update annually but doesn't specify which index or methodology, the fallback is the IGC (Índice de Garantía de Competitividad). This only matters when the contract is genuinely silent on the mechanism — most contracts that include an update clause do specify an index (commonly IPC), which takes precedence over this fallback.

The increase is capped, even when an index is agreed

Whatever index or methodology the contract specifies, the annual increase cannot exceed the applicable IPC (Consumer Price Index) variation under the current text of Article 18. This cap applies regardless of what the contract says — an agreed mechanism that would produce a higher number doesn't override the statutory cap.

Where the actual numbers come from

The indices that feed rent updates — IRAV (Índice de Referencia de Arrendamientos de Vivienda), IPC, and IGC — are published monthly by INE (Instituto Nacional de Estadística). These are genuinely moving figures, not fixed constants, so "how much can I raise the rent this year" depends on which month's published data applies to your renewal date — always check the current published rate rather than relying on last year's number.

Quick answers

Can a landlord raise the rent mid-contract if the tenant agrees verbally? The LAU requirement is that the update mechanism be part of the agreed contract terms — a verbal side-agreement is legally much weaker ground than a written clause, and disputes over what was actually agreed are exactly the kind of situation a written contract exists to prevent.

Does this apply to short-term/seasonal rentals the same way? Article 18 sits within the LAU's housing-lease framework; seasonal and tourist rentals often follow different rules. Don't assume the same cap applies without checking the specific regime that governs your contract type.

What happens at contract renewal, as opposed to an annual update within the same contract? Renewal negotiations are a different situation from an in-contract annual update — at renewal, the parties can in principle negotiate a new rent, subject to any additional protections that may apply (e.g., in a declared tensioned zone). This article covers in-contract updates specifically.

Estimate your legal rent update

Our rent update calculator applies the current published index data to show the maximum legal increase for your situation.

This article offers general, educational information and does not constitute tax, legal, or financial advice. Rent-update rules are an area where transition rules and caps change — confirm the current figures with a qualified professional before acting.