person
Small holder (up to 10 properties)
Subject to the previous-contract cap in stressed zones, but not required to use the official index system. Keeps more bargaining room. No extra reporting duties.
2026 guide, Law 12/2023
Spain's Housing Law in 2026: what changes for you as an investor
A non-political read of Law 12/2023 on the right to housing: stressed zones, INE Reference Index, large-holder rules and concrete consequences for your yield.
Published 15 May, refreshed on 22 May 2026 with the current list of stressed zones.
Law 12/2023, known as the Right to Housing Law, came into force on 26 May 2023. While its language emphasises the social side of the housing problem, its practical impact reaches any investor with one or more rental flats in Spain: it changes how rent is updated, introduces stressed zones, hardens the regime for large holders and shifts agency fees onto the landlord.
This guide covers the points that move the needle on net yield, with a focus on what small and mid-sized investors can and should do today. The angle is operational, not legal: for specific situations, always consult a lawyer or gestor.
The Housing Law at a glance
Most-searched facts, as of 2026.
| Statute | Law 12/2023 of 24 May, on the right to housing. In force from 26 May 2023. |
| Rent indexation | Capped at the INE Reference Index for 2025-26 (replacing the general CPI). |
| Stressed zones | Declared by autonomous communities. In 2026, active in Catalonia, San Sebastián and several coastal regions. |
| Large holder | More than 10 urban properties, or 5 if the autonomous community has set that threshold in a stressed zone. |
| Estate-agency fees | Borne by the landlord, not the tenant, for all new contracts signed after 26-05-2023. |
The 4 changes that hit investors hardest
Of the 50+ articles in the law, these four are the ones that actually move net yield.
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CPI no longer drives rent updates
For 2025 and 2026, the annual rent update is computed from the INE Reference Index. It usually sits below the general CPI, capping the maximum allowed increase. Worth reviewing existing contracts to confirm which index applies.
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Stressed zones cap new contracts
If your flat sits in a stressed zone, the new contract's rent cannot exceed the previous contract's updated rent. This blocks any market-price reset when changing tenants.
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Extra rules apply to large holders
Holding more than 10 properties (or 5 in a stressed zone depending on the region) means using the official price index, plus reporting duties to the administration.
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Agency fees fall on the landlord
Management and contract-formalisation fees are now on you, not on the tenant. Direct hit to first-year net yield when working through an agency.
Stressed zones: how they work in practice
A stressed residential market zone is an area (could be a whole municipality or a neighbourhood) that meets one of the law's criteria: rent burden above 30% of average household income, or rent prices climbing at least 3 points above CPI over the past 5 years. The declaration is made by the autonomous community.
Once declared, all new contracts in the area are capped: the rent cannot exceed the previous contract's updated rent. Large holders also face the official index system, which sets a maximum price based on size, age and characteristics of the property.
Is my property in a stressed zone?
In 2026, Catalonia has declared more than 270 municipalities as stressed zones. San Sebastián keeps them active. Madrid, Andalusia and several others have not activated them so far. Check the official list from the Ministry of Housing or your region before signing any new contract.
The INE Reference Index, explained
Since 2024, the annual rent update is no longer computed from the general CPI but from a specific index published monthly by Spain's statistical office (INE). The stated goal is to decouple rents from consumer-goods inflation (energy, food) and limit increases during high-inflation periods.
For 2025-26 the index has hovered around 2% annually. That means more modest increases than CPI would have allowed, which peaked at 6-8% in some months of 2022-23.
Practical example
Current rent: €1,000/month. Last 12-month CPI: 3.5%. Reference Index: 2.1%. Applicable update: €21/month (not €35). Annual difference: €168 less for the landlord.
Small vs large holder: what changes
The law splits investors into two regimes depending on how many properties you own.
apartment
Large holder (more than 10, or 5 in a stressed zone)
Must apply the official index system when setting prices in stressed zones, not just the previous-contract cap. Has reporting duties to the administration. Non-compliance fines can reach €90,000.
Frequently asked questions about the Housing Law
When did Law 12/2023 come into force? expand_more
On 26 May 2023, published in the BOE on 25 May. Its effects on lease contracts apply to new contracts signed after that date and, in some cases (annual rent update), also to existing contracts.
Is my flat necessarily in a stressed zone? expand_more
No. Declaring a stressed zone is up to each autonomous community. In 2026 it is active in Catalonia (more than 270 municipalities), San Sebastián and a few other specific areas. Check the official list from your region or the Ministry of Housing.
What if my flat is already let and a new stressed zone is declared? expand_more
The contract in force continues under its original conditions. The stressed-zone restrictions apply to new contracts signed after the declaration, not to existing ones.
Am I a large holder with 5 properties? expand_more
Depends on the region. The general threshold is more than 10 properties, but the law allows regions to lower it to 5 in their stressed zones. Catalonia already does so. Check the current threshold where your properties are located.
Can I deduct the cost of complying with the law? expand_more
Gestoría fees and software costs tied to compliance are deductible from IRPF like any other expense necessary to earn rental income. See the full deductible-expenses guide.
Does the law limit short-term rentals? expand_more
Law 12/2023 does not directly regulate short-term rentals, but it does let municipalities limit them in stressed zones. Several cities have used this to impose moratoriums or quotas.
What if I raise the rent above the legal cap? expand_more
The clause would be void and the tenant could claim the over-charged amounts back, plus costs. In stressed zones with a large holder, fines up to €90,000 apply in the worst cases.
Does the law affect seasonal rentals? expand_more
Genuine seasonal contracts (holidays, work relocation with documented cause) sit outside the mandatory-extension regime. But the administration scrutinises simulated seasonal contracts used to dodge the 5/7-year minimum and treats them as legal fraud.
Does the law have retroactive effect? expand_more
Not in general terms. New contracts signed from 26-05-2023 onwards apply the law. Earlier contracts keep their conditions, except for the annual rent update, where the INE cap does apply.
Where is the official text of the law? expand_more
Published in the BOE of 25 May 2023, accessible from the official State gazette. The Ministry of Housing and Urban Agenda also keeps an official FAQ section.
Run your portfolio under the new law without losing yield
imotrack auto-updates rents with the INE index, flags contracts in stressed zones and projects the impact on net yield.
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