Bringing an older building into line with the Land Registry is a common exercise, and almost invariably a costlier one than expected. The reason is that a single deed records two separate legal acts, each attracting its own charge and, more surprisingly, each measured on a base built on the opposite principle. Binding ruling V0383-26, issued on 25 February 2026 by the Dirección General de Tributos (the Spanish tax authority's directorate that issues binding rulings), sets out the framework.
The facts considered
The taxpayer owns a building constructed in 2000 and laid out from the outset over three floors: a ground-floor storage unit and two independent dwellings. The Land Registry, however, records the construction as a single dwelling. To reflect the reality on the ground, the owner intends to execute a declaración de obra nueva antigua (a deed declaring the existence of a building completed some time ago) together with a división horizontal (the deed creating a horizontal property regime), separating the three units that already exist in fact.
Two conventions in a single deed
Article 4 of the consolidated ITP and AJD Act provides that a single convention may attract no more than one charge, but that where one deed contains several conventions each separately subject to the tax, the charge corresponding to each of them is due.
The declaration of the building and the creation of the horizontal property regime are two distinct conventions. Both satisfy the requirements of article 31.2 of the consolidated Act: a first authorised copy of a notarial deed, a quantifiable object, a registrable act, and no liability to inheritance and gift tax or to the transfer tax and corporate transactions heads of charge. In both, the taxable person is the owner, under article 29, as the person who requests the deed and in whose interest it is issued.
The building declaration is measured by construction cost
The base for the declaration is the real cost of the works, under article 70.1 of the implementing regulations. The Dirección General de Tributos stresses that this is not the value of the property, but the actual cost of the works carried out, since what reaches the Land Registry through the deed is the construction itself and not the value of the asset. That reading already followed from rulings V3306-19, of 2 December 2019, and V0506-20, of 2 March 2020.
The declaration, the ruling recalls, is a unilateral legal act recording that the building is physically complete and that title to what has been built has been acquired. It presupposes no transfer of property, yet it does trigger the variable stamp duty charge on notarial documents.
A significant clarification has since been added. In judgment 617/2026, of 18 May, appeal 8043/2023, the Spanish Supreme Court held that the relevant cost is the cost as at the time the works were carried out, with no monetary indexation, however many years may have passed before the deed is executed.
The horizontal property regime is measured by present value
Through the división horizontal, ownership of a building is subdivided into privately owned units, creating separate registered properties, each with an allocated share in the common elements.
Its base follows the general rule in article 30.1 of the consolidated Act, as completed by article 70.2 of the regulations: it comprises both the real cost of the construction and the real value of the land. The ruling is explicit in concluding that the base is the aggregate value of the resulting units, measured as the value of the construction plus that of the land on which it stands.
The valor de referencia (the reference value set by the Cadastre) also comes into play. Where the base is determined by reference to the value of real property, that value may not fall below the figure resulting from article 10 of the consolidated Act, namely the cadastral reference value at the date the tax accrues. If the value declared by the parties or the consideration agreed is higher, the greater of those figures applies. Where no reference value exists or it cannot be certified, the base is the highest of the declared value, the agreed consideration and the market value.
Practical implications
One consequence deserves to be flagged to the client in advance. The bulk of the tax cost does not lie in the building declaration, which is the step owners tend to fear, but in the horizontal property regime. In a building completed twenty-five years ago the historic construction cost is a modest figure that is not indexed, whereas the resulting units are measured on present-day parameters, with the cadastral reference value acting as a floor.
The second consequence is evidential. The first charge rests on a construction cost that must be substantiated, and in older regularisations the original documentation, the budget, the certificate of completion or the building licence, has frequently not been kept. It is worth retrieving it before attending the notary, because the ruling does not address how that cost is to be established where no supporting evidence survives, and that is precisely the most common difficulty in these files.
Conclusion
One deed, two chargeable events, and two bases built on opposing principles: one looking back to the time of construction, the other to the present value of the property. Planning the regularisation means quantifying both separately and gathering the evidence of the original cost beforehand.
Lex·on advises on real-estate taxation and registry regularisation from Palma de Mallorca and Manacor. If you are preparing a building declaration or a horizontal property regime, we can review its tax cost before the deed is signed.
Source: Binding ruling V0383-26 of 25 February 2026, Spanish Directorate General for Taxation, Sub-Directorate for Property, Fees and Public Charges.
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This article is for information purposes only and reflects the administrative position in force on the date of publication. It does not constitute legal or tax advice and does not replace an individual analysis of each case.