Investment approach
The Catastro and reality: what to check before the deposit
The Catastro describes a property for tax; the Registro settles questions of title. Which taxes depend on cadastral data, which discrepancies are dangerous and how to check them before the deposit.
The Catastro (the Spanish property cadastre) is the state register that describes real estate for tax purposes: floor area, use, cadastral value and the valor de referencia (reference value). Its data are presumed correct until the contrary is proved, but legal questions are settled by the Registro de la Propiedad (Land Registry) (art. 3 TRLCI, the cadastre law). So a discrepancy between the cadastre, the registry and the flat is checked before the deposit: taxes depend on the cadastre, rights on the registry.
The referencia catastral is the property's unique number in the Catastro. It appears in the listing, in the escritura (notarial deed) and on the IBI (local property tax) receipt, and any check starts from it.
How the Catastro differs from the Registro de la Propiedad
The Catastro describes the property; the Registro protects the rights to it. The two systems are run by different bodies, and the data in them can differ.
| Question | Catastro | Registro de la Propiedad |
|---|---|---|
| What it describes | Physical and economic characteristics, a map representation | The owner, shares, mortgages, attachments, easements |
| Legal force | Data are presumed correct (art. 3.3 TRLCI) | Registry entries take priority on questions of title |
| The owner's name | Protected data, not shown to outsiders (art. 51) | Appears in the nota simple (registry extract) for a person with a legitimate interest |
| Cadastral value | Protected data, visible to the owner | Not given |
| What the buyer uses it for | Taxes and checking the physical description | Checking title and charges |
A buyer will not see the cadastral value of someone else's flat without the owner's consent, so it is taken from the seller's IBI receipt. What else is open in the registers and to whom is covered in the article what is visible about an owner in four registers, and how to read a registry extract in the article on the nota simple.
Which taxes are calculated from Catastro data
Cadastral data feed both the one-off taxes of the transaction and the annual costs of ownership. Some of the rules were changed by Real Decreto-ley 29/2026, in force from 8 October 2026, but the Congress of Deputies has not yet validated it (as of 13 October 2026).
| Tax | What is taken from the Catastro | 2026 changes |
|---|---|---|
| ITP (transfer tax) on buying a resale home | The valor de referencia as the minimum base | No change |
| IBI | Cadastral value | Surcharges on tourist and empty housing in a stressed-market area (art. 72 TRLRHL) |
| Plusvalía municipal (municipal tax on the increase in urban land value) | Cadastral value of the land (art. 107.2 TRLRHL) | New maximum coefficients from 1 December 2026 |
| Imputed income on a second home | Cadastral value (art. 85 LIRPF, the personal income tax law) | A scale of 1.1–3% of the sum of values from 1 January 2027 |
The ITP base is the valor de referencia if the price and the declared value are not higher than it (art. 10.2 TRLITPAJD); how to challenge it is covered in the article on the valor de referencia. The text of the decree with the table of plusvalía coefficients is published in the BOE.
Which discrepancies occur and why they are dangerous
It is not the discrepancies themselves that are dangerous, but what lies behind them. Typical cases:
- the area in the cadastre is larger or smaller than in the listing and in the registry;
- the cadastre does not show an extension, an enclosed terrace or the merging of two flats;
- the use in the cadastre is non-residential, while the premises are used as a flat.
An unregistered alteration or a non-residential use is a question for an abogado (lawyer): they determine whether it is lawful to sell the property as a home and which taxes are paid. The area in the registry can be corrected without a separate procedure only if the difference is no more than 10% of the recorded figure and is confirmed by a cadastral certificate, or no more than 5% in a simple correction (art. 201.3 Ley Hipotecaria). For flats in a building under división horizontal (horizontal property) the procedure for correcting the description is not permitted and the original document must be amended (art. 201.1.e); whether the simplified thresholds apply to them is decided by the registrador (registrar) and the abogado.
How to check the data: the order of steps
- Take the referencia catastral from the listing or the IBI receipt and ask the seller for a cadastral certificate with description and plan (certificación catastral descriptiva y gráfica). It is attached to the notarial documents (art. 3.2 TRLCI).
- Order a fresh nota simple and compare the area, floor, the rooms and the use.
- Compare both documents with the flat's plan, the cédula de habitabilidad (habitability certificate) and the works licences.
- Look up the valor de referencia and compare it with the price, to know the ITP base in advance.
- If the description is out of date, agree who files the declaration of changes before the transaction. The duty lies with the owner (art. 13 TRLCI), and failure to file risks a fine of 60 to 6,000 € (art. 70–71).
Where a Catastro check does not work
The cadastre does not show the owner to outsiders, does not show mortgages and attachments and does not confirm that works in the flat are lawful. For that you need the Registro de la Propiedad, whose role is covered in the article on the Registro de la Propiedad, and a planning check at the town hall.
Nor should the cadastral area be relied on when judging the price: it can be out of date in either direction. The value of a flat is checked against closed transactions and actual metres, which is done as part of a property valuation.
Questions and answers
How does the Catastro differ from the Registro de la Propiedad?
The Catastro describes a property for tax: area, use, value. The Registro records the owner and the charges, and on questions of title its entries take priority.
How can I find out a flat's cadastral data before buying?
The description of a property by referencia catastral is open to all in the Sede Electrónica del Catastro (the cadastre's online office). The owner's name and the cadastral value are protected and visible to the owner, so the certificate and the IBI receipt are requested from the seller.
What should I do if the area in the cadastre does not match the listing?
Compare it with the nota simple and the plan and find the cause. A small difference is normal, but an extension or the merging of flats not reflected in the documents is a question for an abogado before the deposit.
Who must update the Catastro data after an alteration?
The owner: the law obliges them to file a declaration of changes. A fine of 60 to 6,000 € is provided for failing to file, so the matter is usually closed before the transaction.
