Legal deadlines for tenants: rent index Spain

Initial rent, stressed areas & reference index 3 min read · published September 11, 2025
As a tenant in Spain, it is essential to know the legal deadlines that govern the rent reference index (MITMA) and how they affect the initial rent and subsequent updates. This article clearly and practically explains which deadlines exist to apply the index, what differences exist in high-pressure areas, and what rights and obligations both landlords and tenants have. It also details when to notify changes, how to document communications and which official resources to consult in case of dispute. If you need to act on an increase, review or doubt about the legality of an adjustment, this guide provides concrete steps and links to official sources to defend your rights.

What is the rent reference index?

The reference index is an administrative tool that guides rent updates and price setting in public calls and housing policies; its application is articulated within the legal framework of the LAU.[1]

The index serves as an official reference to update rents in contracts and renewals.

Key legal deadlines

These are the deadlines tenants should keep in mind:

  • Deadline to apply an annual review: normally the update must be communicated with sufficient advance notice according to the contract and administrative practice.
  • Written notice deadline: increases or adjustments must be notified in writing following what is agreed in the contract and the LAU.
  • Deadlines in high-pressure areas: there may be limits and specific procedures to apply increases in municipalities declared as high-pressure areas.
Read your contract and the update clauses to verify applicable deadlines and formulas.

High-pressure areas and initial rent

In areas declared high-pressure, administrations may establish caps or measures for initial rent and its review; if you live in such an area, the index application may be subject to additional rules and municipal or regional measures.[1]

If you suspect an increase does not respect applicable limits, document the communication and seek official advice.

What to do when notified of an increase

Steps and recommendations to respond to a notification of an increase based on the index:

  • Review the documentation: keep the notice, contract and receipts to have evidence.
  • Check deadlines: note the date of receipt and the deadlines to challenge or respond.
  • Communicate in writing: request clarifications from the landlord and ask them to explain the calculation.
  • If appropriate, start proceedings in court or request mediation depending on the seriousness of the dispute.[2]
Always keep copies of communications and payment receipts.

How to document and prove your case

Organized documentation facilitates any claim: contract, receipts, the adjustment notice, emails and calculations. If there is a discrepancy in the applied formula, prepare a summary with your calculations and key dates.

A clear list of receipts and dates speeds up administrative or judicial procedures.

Frequently Asked Questions

What deadlines exist to apply the rent reference index?
It depends on the contract and applicable regulations; usually updates are annual and must be notified in writing with the notice period established in the contract or administrative practice.
What changes if I live in a high-pressure area?
In high-pressure areas there may be limits to increases or special rules for initial rent; check local regulations and the LAU to confirm specific effects.
What can I do if I consider the increase illegal?
Document the notice, request an explanation in writing, and if there is no agreement seek mediation or file a claim in the Court of First Instance; deadlines to act are strict, so responding promptly is important.[2]

How-To

  1. Gather essential documentation: contract, receipts, the increase notice and communications.
  2. Request in writing from the landlord the formula and calculation applied and keep proof of receipt.
  3. Contact municipal or regional legal guidance services to assess options.
  4. If there is no agreement, file a claim or request precautionary measures in the Court of First Instance.
  5. Keep a record of payments and notices throughout the process.

Key takeaways

  • Deadlines to apply and contest updates are decisive and must be respected.
  • The index guides revisions, but its application can vary in high-pressure areas.
  • Document everything and request explanations in writing to strengthen your case.

Help and Support / Resources


  1. [1] BOE - Consolidated text of the Ley de Arrendamientos Urbanos
  2. [2] Ministry of Justice - Information on civil procedures
  3. [3] Judiciary - Resources and access to justice
Bob Jones
Bob Jones

Editor & Researcher, Tenant Rights Spain

Bob writes and reviews tenant law content for various regions. They’re passionate about housing justice and simplifying legal protections for tenants everywhere.