FixrOS knows which leases reach their anniversary each month, takes the latest index published by Spain's National Statistics Institute (INE) and proposes each new rent. You review and confirm; the bill is updated and the tenant sees the new rent in their portal.
Each lease has its anniversary in a different month, some follow CPI and others IRAV, and the rules have changed several times since 2022. With a mid-sized portfolio, it's easy to lose money or apply an increase that isn't due.
If you don't review on the date, that money can't be recovered retroactively: the new rent is only due from the month after it is notified.
Applying CPI where the law caps with IRAV, or using the wrong reference month, invites a tenant complaint.
On a commercial unit, the base is what gets reviewed; VAT and withholding must be recalculated. By hand it's easy to get wrong.
Letters, emails and calls for every tenant, with no clear record of what was said and when.
When you set up the lease you choose whether it is reviewed by CPI or IRAV. On its anniversary, FixrOS takes the latest index the INE has published at that date and calculates the new rent. If the lease carries VAT and withholding, it reviews the base and recalculates the full bill.
Reviews come out prepared and the firm confirms them, one by one or all of the month's at once. That lets you check first whether any legal cap affects that lease. Once confirmed, any bill for the month not yet collected or sent to the bank is rebuilt with the new rent, and a review is never applied twice.
The updated rent appears in the tenant portal and app, next to their lease and bills. If you also want to send the written notice, you prepare it from messaging with a preview before sending.
For housing, rent can only be reviewed on each anniversary of the lease and on the agreed terms. If the lease says nothing, there is no review. If the lease provides for a review but names no index, the annual change in the IRAV applies. In any case, the increase cannot exceed the change in the IRAV, using the latest index published at the review date (Article 18.1 LAU, as worded by Royal Decree-law 29/2026).
CPI measures the general change in consumer prices. The IRAV (reference index for the annual review of housing leases) was created by the eleventh additional provision of the LAU, added by Housing Act 12/2023, to prevent disproportionate increases. According to the INE, it is the lowest of the annual CPI rate, the core CPI rate and an adjusted average rate; it has been published monthly since January 2025, on the same dates as CPI. See the latest figure and history on our IRAV page.
The fourth transitional provision of Act 12/2023, as worded by Royal Decree-law 29/2026, provides that housing leases signed before that Act came into force (26 May 2023) are also reviewed subject to the cap in the eleventh additional provision and Article 18.1 LAU. In all other respects, they keep the rules in force when they were signed.
The sixth final provision of Royal Decree-law 29/2026, in force since 8 October 2026, caps reviews of housing leases whose anniversary falls between that date and 31 December 2027:
Royal decree-laws must be ratified by Congress within thirty days of being enacted (Article 86 of the Spanish Constitution). The previous one, Royal Decree-law 26/2026, was not and was repealed. Before confirming a review, check in the Official State Gazette (BOE) whether 29/2026 is still in force.
Under Article 18.2 LAU, the updated rent is payable by the tenant from the month after they are notified in writing, stating the percentage applied and enclosing, if the tenant asks, the INE certificate. A note on the previous month's bill counts as notice.
Non-housing leases (shops, offices) are governed by what the parties agree (Article 4.3 LAU), so they are reviewed according to their clause, usually by CPI. In stressed residential market areas, Article 17.6 also caps the starting rent of new housing leases relative to the previous lease. For a one-off figure, use the rent review calculator.
| Situation | How it is reviewed | Rule |
|---|---|---|
| Housing lease with no review clause | No review | Art. 18.1 LAU |
| Housing lease with a clause naming no index | Annual change in IRAV | Art. 18.1 LAU |
| Housing lease with a CPI or other index clause | As agreed, not exceeding IRAV | Art. 18.1 LAU |
| Housing lease signed before 26 May 2023 | As agreed, capped by IRAV | TP 4 Act 12/2023 |
| Housing lease with anniversary between 8 October 2026 and 31 December 2027 | No increase if above the reference index; otherwise new agreement or 2% at most | FP 6 RDL 29/2026 |
| Shop or office | According to the lease clause | Art. 4.3 LAU |
Indicative summary of the rules in force on 18 October 2026. Royal Decree-law 29/2026 was awaiting ratification on that date.
You multiply the current rent by the annual change in the agreed index, using the latest figure published on the lease anniversary. For housing, the increase cannot exceed the change in the IRAV (Article 18.1 LAU).
It is the reference index for the annual review of housing leases, provided for in the eleventh additional provision of the LAU (Act 12/2023). The INE has published it monthly since January 2025 and it acts as the ceiling for annual housing rent increases.
No. For housing, without an express review clause no rent review applies (Article 18.1 LAU).
From the month after they are notified in writing with the percentage applied. A note on the previous month's bill counts as notice (Article 18.2 LAU).
Not by default: FixrOS calculates and proposes each review with the INE index and the firm confirms it. There is an option to apply them automatically, but it is off so you can check each lease's legal caps first.
Rent reviews are part of the Portfolio module, with a 14-day trial. Pricing depends on your portfolio: we explain it in a demo.
Information checked on 18 October 2026 against the Spanish Urban Leases Act 29/1994 (arts. 4, 17, 18 and eleventh additional provision), Act 12/2023 (fourth transitional provision), Royal Decree-law 29/2026 (sixth final provision; awaiting ratification on that date) and the INE note on the IRAV. We will review this page if Royal Decree-law 29/2026 is not ratified or is amended. It is not a substitute for professional advice.
We show you FixrOS rent reviews with your real leases.
One operating system. 6 apps.
