Two registers, two purposes
Spain has two property databases that are frequently confused:
- The Registro de la Propiedad, of a legal nature, where ownership, rights and charges on properties are registered (mortgages, embargoes, usufructs, easements). It is the source for knowing who the registered owner is and what burdens the property.
- The Catastro, of an administrative and fiscal nature, managed by the Directorate-General for Cadastre. It describes properties (surface, use, cadastral value, mapping) and is used mainly to calculate taxes such as the IBI.
The fact that something appears in the Catastro does not mean it is registered at the Registry, and vice versa. Differences in surface area, address and even ownership between the two are common.
Identifiers that do not correspond
Each register uses its own identification system:
- At the Registry, the property is identified by its finca registral number within each Registry office and by the CRU/IDUFIR, the unique registry code that works as the property's national ID.
- At the Catastro, the property is identified by the referencia catastral, a 20-character code shown on the IBI bill.
The Registrars' own e-office warns about it: the CRU/IDUFIR does not correspond to the referencia catastral. Searching for a nota simple with the referencia catastral helps locate the property, but the registry document is identified by its own data.
Why the data does not match
The most frequent discrepancies:
- Surface area: the actual built surface, the cadastral one and the registered one can be three different figures, especially in old or renovated properties.
- Address: the Registry sometimes keeps the historical address; the Catastro, the current one.
- Ownership: the Catastro may keep showing a previous owner until it is updated.
- Units: garages, storage rooms or common elements may be grouped differently in each register.
Which one to use for each purpose
- To check ownership and charges (purchase, inheritance, embargo): the nota simple from the Land Registry.
- For taxes and physical data (IBI, cadastral value, plans, reference surface): the Catastro e-office, where basic data consultation is free.
- To locate a property when you only have the address: the Registrars' Geoportal cross-references the address with mapping and links to the registry information.
If there is a serious discrepancy
A difference in surface area or boundaries can be corrected, but it is not fixed only in the Catastro or only in the Registry: there are procedures to rectify and coordinate both (for example, the cadastral alteration declaration and, where appropriate, registry rectification or the coordination procedures between Catastro and Registry). In purchases with relevant discrepancies, it is wise to resolve them before signing.
A typical example: the square metres do not match
One of the most common situations when buying a home: the listing says 90 m², the Catastro says 82 m² and the deed (and the Registry) say 85 m². Which one counts?
- For the purchase and the mortgage, the registry description is what matters: it enjoys a presumption of accuracy against third parties.
- For taxes (IBI property tax, capital gains), the administration uses the cadastral data.
- The listing proves nothing; it is only the seller's statement.
If the gap is large, ask before signing: it may come down to how common areas are measured, an undeclared renovation, or an error in one of the two registries.
What to do if Registry and Catastro disagree
Discrepancies can be fixed, but each body fixes its own:
- Error in the Catastro (surface, boundaries, reference): corrected before the Catastro office, providing documents such as the deed or a technician's certificate.
- Error in the Registry: rectification follows the registry channel and, depending on the case, may require a rectification deed or a formal procedure.
- If you only want to link both records, the Catastro allows associating the cadastral reference with the registry identifier (IDUFIR/CRU) in some procedures.
When to consult each one
- Before buying or signing a deposit contract (arras): Land Registry (nota simple), for ownership and charges.
- To know the taxable surface, the cadastral value or to locate a property on the map: Catastro.
- For an inheritance, a plot division or a declaration of new construction: you will normally need to work with both, and a professional (notary, gestor or technician) often coordinates them.
A nuance that prevents scares
A property appearing in the Catastro under your name does not make you the owner, and its absence does not mean you are not. Ownership is proven at the Registry; the Catastro is an inventory mainly for tax purposes. In fact, the Registrars' association itself warns that the registry identifier (CRU/IDUFIR) does not correspond to the cadastral reference: they are two parallel systems worth knowing, but not mixing up.