The four property valuations in Spain: valor catastral, valor de referencia, valor de mercado and valor de tasacion compared

Spain applies four different valuations to the same property, and confusing them is the most common mistake foreign buyers make. The valor catastral drives your annual IBI, the valor de referencia sets the minimum base for transfer tax, the valor de mercado is what you actually pay, and the valor de tasacion is what the bank thinks the property is worth for lending. Each is set by a different body, at a different ratio to market, and serves a different tax or transaction. Understanding all four in one place is what saves buyers from overpaying tax or being surprised by a low mortgage offer. The landscape shifted in February 2026, when the Tribunal Constitucional upheld the valor de referencia as constitutional but confirmed taxpayers can challenge it by any means of proof, including independent expert reports.

What is the valor catastral and what tax does it drive?

The valor catastral is the fiscal value the Dirección General del Catastro assigns to every property in Spain, and it is the base on which your town hall calculates the annual IBI (impuesto sobre bienes inmuebles). It also feeds the imputed income calculation in IRPF and IRNR, so non-resident owners pay a notional tax on a property they do not rent out, derived from this figure.

A ministerial order of 14 October 1998 (BOE-A-1998-24160) fixes the coeficiente de referencia al mercado at 0.5, meaning cadastral values are set at roughly half of market value at the point of the Ponencia de Valores. The Catastro does not revise this figure every year. Collective revisions happen only when a municipality commissions a new Ponencia, so in much of Spain the valor catastral reflects values from years or even a decade ago. This is why the IBI on a EUR 600,000 Marbella apartment might be calculated on a cadastral value of EUR 150,000 or less.

You can check your valor catastral free on the Sede Electronica del Catastro using either the referencia catastral or the property address. Our separate guide to the Catastro and cadastral value explains the lookup and challenge process in detail.

What is the valor de referencia and when does it apply?

The valor de referencia de mercado is a market-proximate reference value derived annually from notarised sale prices. The Dirección General del Catastro calculates it from the prices of all compraventas formalised before a notary, and caps it below market value with a 0.9 factor of minoracion under Orden HFP/1104/2021 (BOE-A-2021-16584). It was introduced by Ley 11/2021 de medidas de prevencion y lucha contra el fraude fiscal and applies to transactions formalised on or after 1 January 2022.

Its purpose is narrow but decisive: it is the minimum taxable base for ITP and AJD on resales, and for ISD on inheritances and gifts. The taxable base is the higher of the declared transfer price and the valor de referencia. So a buyer paying EUR 400,000 for a property with a reference value of EUR 450,000 pays ITP in Andalusia on EUR 450,000, not the contract price.

The 2026 exercise values were set by the Resolucion de 27 de octubre de 2025 of the Dirección General del Catastro and announced in the BOE on 16 December 2025 (BOE-B-2025-46480, dated 2 December 2025). These values became consultable on the Sede Electronica del Catastro from 1 January 2026 and govern the minimum tax base for ITP, AJD and ISD throughout the 2026 calendar year. The valor de referencia is published annually and updates every year from real transaction data, unlike the valor catastral, which is revised infrequently. Our dedicated guide to the valor de referencia covers the challenge route, the ISD interaction and the new-build exemption in detail.

What did the Constitutional Court rule on the valor de referencia in February 2026?

The Tribunal Constitucional delivered Sentencia 13/2026 on 12 February 2026 (BOE-A-2026-6480), resolving the first question of unconstitutionality raised against the valor de referencia. The case originated in Casares, Málaga, where a couple bought a 125 square metre apartment and a garage for EUR 209,000 in June 2022. The Agencia Tributaria de Andalucía applied the valor de referencia to the apartment, lifting the taxable base to EUR 262,468.74, roughly 30 per cent above the escriturado price. The Tribunal Superior de Justicia de Andalucía questioned whether this system, based on a bulk calculation it described as cryptic and inaccessible to the average taxpayer, violated the principle of capacidad economica under Article 31.1 of the Constitution.

The Constitutional Court desestimada the question: the valor de referencia is constitutional. But the reasoning matters as much as the outcome. The Court classified the valor de referencia as a presuncion iuris tantum, not an absolute presumption. It is a starting value the legislator sets, but the taxpayer can displace it. The Court declared the system is open to contradiction and allows the taxpayer to prove a different value sin limite probatorio de ninguna clase, dictamenes periciales incluidos. This means independent expert reports, comparable transaction evidence and any other proof of market value can be brought in any appeal channel: rectification of the autoliquidacion, recurso de reposicion, reclamacion economico-administrativa and the contentious-administrative route.

The Court drew an explicit contrast with the plusvalia municipal system declared unconstitutional in STC 182/2021, which operated as an absolute presumption that admitted no proof to the contrary. The valor de referencia is constitutional precisely because it is not inapelable. The practical consequence for buyers is significant: the tasacion pericial contradictoria, the formal expert challenge designed for value comprobaciones, is not the only route, because the valor de referencia is not technically a comprobacion de valores but a rule of application. The real opening is freedom of proof across every appeal channel.

What is the valor de mercado and how is it determined?

The valor de mercado is the actual market price: what a willing seller and independent buyer agree in an orderly sale. Article 4 of Order ECO/805/2003 (BOE-A-2003-7253) defines it as the price at which the property could be sold via private contract between a voluntary seller and an independent buyer on the valuation date, assuming public marketing, normal market conditions and a reasonable negotiation period.

In practice, the valor de mercado is the figure a buyer and seller negotiate and write into the escritura. It is not set by any official body. It is the benchmark against which the other three valuations are measured, and it is the one you want all the others to be sensibly below. For a deeper discussion of how market price is established and the gap between asking and closing, see our guide to property valuation in Spain.

What is the valor de tasacion and why does the bank need it?

The valor de tasacion, also called valor hipotecario, is the formal valuation a bank uses to decide how much it will lend against a property. Article 4 of Order ECO/805/2003 defines it as the value determined by a prudent assessment of the future possibility of trading the property, considering long-term durable aspects, normal and local market conditions, and current and alternative uses. Crucially, the same article states that speculative elements are excluded from the determination.

This is the key difference from valor de mercado: the tasacion strips out speculative premiums and applies the principio de prudencia (Article 3.1.f), which requires the tasador to choose the lower value where scenarios are equally probable. For mortgage purposes, this principle is mandatory. The practical effect is that the valor de tasacion typically lands 10 to 20 per cent below the agreed sale price, which caps the loan-to-value at a figure below the purchase price and forces the buyer to cover the gap in cash. Our guide to the mortgage valuation process covers the four valuation methods the Order prescribes and the six-month validity rule.

How do the four valuations compare on one property?

The table below sets out what each value is, who sets it, what it drives, and its typical relationship to the actual market price of the same property.

Valuation	Who sets it	What it drives	Typical ratio to market	Update frequency	Challenge route
Valor catastral	Catastro (Ponencia de Valores)	IBI, imputed income (IRPF/IRNR), wealth tax base	~0.5 (fixed by 1998 order)	Collective revisions only	Town hall / AEAT recurso de reposicion
Valor de referencia	Catastro (annual, from notarial data)	Minimum ITP/AJD/ISD tax base	~0.9 (minoracion factor, Orden HFP/1104/2021)	Annual (Resolucion de 27 octubre 2025 for 2026)	Any means of proof per STC 13/2026, in any appeal channel
Valor de mercado	Market (negotiated buyer and seller)	The actual sale price, ITP declared base if above valor de referencia	1.0 (it is the market)	Continuous	Not applicable
Valor de tasacion (VH)	Homologated sociedad de tasacion (Banco de España registered)	Mortgage lending cap (LTV base)	Typically 0.8 to 0.9 (prudencia discount)	6-month validity (Article 62, ECO/805/2003)	Second tasacion or price renegotiation

The important row is the second one. Many buyers assume the valor catastral is the tax base for transfer tax. It is not. Since January 2022, the valor de referencia has displaced it as the floor, and because the valor de referencia is set at 0.9 of market rather than 0.5, it sits much closer to the actual sale price. This is the reform that caught buyers and their advisors by surprise in 2022 and 2023, and it remains the single most expensive misunderstanding in a Spanish property purchase. The February 2026 Constitutional Court ruling did not change the tax base, but it changed the evidentiary threshold for challenging it, lowering the barrier for taxpayers who can produce a credible expert valuation.

Which valuation matters for which tax or transaction?

Each valuation governs a specific moment in the ownership lifecycle, and they do not cross over. The valor catastral governs the annual holding taxes: IBI, imputed income under IRNR for non-residents, and the wealth tax base. The valor de referencia governs the point of transfer: ITP on resales, AJD on the stamp duty portion of new builds, and ISD on inheritances and gifts. The valor de mercado is the figure you negotiate and declare. The valor de tasacion governs the mortgage: the bank lends a percentage of this figure, not the sale price.

A buyer who understands this separation avoids two errors. The first is assuming the valor catastral sets the transfer tax base. It does not. The second is assuming the bank valuation determines the price. It does not. It determines the loan. If the tasacion comes in at EUR 480,000 on a EUR 600,000 purchase, the bank lends 70 per cent of EUR 480,000 (EUR 336,000), not 70 per cent of EUR 600,000. The buyer covers the EUR 120,000 gap plus the EUR 84,000 lending shortfall. This is why the total cost of buying includes a contingency for a low valuation.

Can you challenge any of these valuations?

Yes, but through different routes, and the February 2026 Constitutional Court ruling clarified the evidentiary standard for the valor de referencia specifically.

The valor catastral can be challenged through a recurso de reposicion filed with the Catastro within one month of notification, or through the town hall when the IBI bill arrives. The valor de referencia cannot be challenged directly at the Catastro. You challenge the tax liquidation that applies it, filing with the relevant tax authority within one month, supported by an independent market valuation. After STC 13/2026, the standard is clear: any means of proof is admissible, including expert reports, and the taxpayer can bring this evidence in the recurso de reposicion, the reclamacion economico-administrativa, or the contentious-administrative proceedings. The burden of proof sits with the taxpayer, but the Constitutional Court confirmed the presumption is not absolute and the door to contradiction is fully open. The valor de mercado is not challengeable because it is your own negotiated price. The valor de tasacion can be contested by commissioning a second tasacion from a different homologated society, or by negotiating the price down to the valuation figure.

A practical point for buyers: the Dirección General del Catastro reported to the Constitutional Court that in 2024, rectification of the valor de referencia was requested in only 1.15 per cent of cases where it exceeded the transfer price, and in roughly half of those the value was effectively corrected. This is a low challenge rate for a system the Court itself characterised as imperfect, and it suggests many buyers are paying tax on an inflated base without realising they have a route to contest it. Our guide to appealing property tax in Spain walks through the recurso de reposicion, the reclamacion economico-administrativa and the evidence you need for each.