In short
When you buy a property in Spain, the tax base for the transfer tax (ITP) and for stamp duty (AJD) is no longer simply the price. It is the reference value (valor de referencia) set by the national land registry, the Catastro, or the price if the price is higher. The rule is national (article 10 of the transfer-tax text, as amended by Ley 11/2021, in force since 11 July 2021) and applies in every region that follows the national text, though not in Navarre or the Basque Country. If the Catastro’s figure looks too high, you can contest it, but only through the tax procedure.
What the law says
Article 10.2 of the national consolidated text (texto refundido, TRLITPAJD) states that for property “its value will be the reference value provided for in the land-registry rules, on the date the tax falls due”. The next sentence gives the safeguard: if the value declared by the parties, the agreed price, or both, are higher than the reference value, the higher figure is the base. Where there is no reference value, or the Catastro cannot certify one, the base is the greatest of the declared value, the price and the market value.
AJD follows. Article 30.1 says that when the base depends on the value of real estate, that value cannot be lower than the one determined under article 10.
How the Catastro sets it
The rule that creates the reference value is in the final provision three (disposición final tercera) of the Catastro law, in the version of Ley 11/2021:
- The Dirección General del Catastro determines it “objectively and with the limit of market value”, from the data in the Catastro, by analysing the prices notaries report in property sales.
- It publishes the conclusions in an annual property-market report and a value map of homogeneous valuation areas with average value modules, on its electronic office.
- A market reduction factor is set by order of the finance minister so that the value never exceeds market value.
- Each year the Catastro approves, by resolution, the elements needed to compute the value of each property. That resolution is published by notice in its electronic office before 30 October of the year before it applies, after a ten-day hearing announced in the BOE. It can be appealed within one month of publication, through an economic-administrative appeal or an optional reconsideration appeal, and the appeal does not suspend it.
- In the first 20 days of December the Catastro publishes an announcement in the BOE, and values can be consulted permanently through its electronic office.
The Catastro’s electronic office (sedecatastro) offers a search tool by year, from 2022 to 2026, and documents on the procedure used to determine the values. Consult it for the figure of the property you plan to buy.
What happens if your price is lower
The reference value wins if it is higher. Calculation, using the 7% Andalusian rate: on a deed price of €200,000 with a reference value of €240,000, the base is €240,000 and ITP is €16,800, not €14,000. If the price is €260,000 with the same reference value, the base is the price and ITP is €18,200. The ITP guide lists the rate by region. The Payotte purchase costs calculator takes the greater of the price and the reference value if you enter it.
How to contest it
Articles 10.3 and 10.4 give two routes, and only these:
- Appeal the assessment the tax office issues, or
- Ask for correction of your self-assessment (rectificación de la autoliquidación), arguing that the value harms your legitimate interests.
In either case the tax administration decides after a binding report from the Dirección General del Catastro, which confirms or corrects the value in light of the documents you supply. The report must explain the resolution, the average value modules and the other elements used. The Catastro also reports when a reference value is contested in an economic-administrative claim. The reference value cannot be challenged in any other way. This guide does not give the filing deadlines for the regional offices; take them from the tax agency of your region.
Navarre and the Basque Country
These two territories have their own foral rules on the base. In Navarre, article 7.1 of the foral text sets the base as the real value of the property transferred, which the administration may check and correct if it is higher than declared. The three Basque provinces have their own regulations on the minimum computable or real value. The Catastro reference value described here is the State’s rule.
What it costs
No fee for consulting the figure was found in the sources read. A valuation report by a surveyor (see property valuer) to support an appeal is a private fee; no official scale was found.
Which professional to consult
A lawyer registered with a Spanish bar association (colegio de abogados), see property lawyer, can prepare the correction request. A chartered valuer produces the evidence of market value.
Frequently asked questions
Can I declare a lower price to pay less tax?
The base is the higher of the price, the declared value and the reference value. Declaring less does not lower it below the reference value.
Where do I find the reference value?
In the Catastro’s electronic office, using the reference value search for the year.
Is the reference value the market value?
The law sets it “with the limit of market value”, reduced by a factor so that it does not exceed it. It is an administrative estimate, not a valuation of your property.
When can I contest it?
Only when appealing the tax assessment or asking for correction of your self-assessment.
Does it apply to Navarre and the Basque Country?
No. They use their own foral rules.
General information drawn from the official sources cited and dated on this page. It is not legal, tax or financial advice: for your own situation, ask a licensed professional.
More guides on purchase taxes by region
- Balearic Islands transfer tax: 8% to 13% and AJD 2%
- Basque Country and Navarre: 4% home transfer tax
- Buying in Catalonia: ITP from 10% to 13%, and 20%
- Canary Islands purchase taxes: ITP 6.5%, IGIC 7%
- Canary Islands: IGIC on a new home and ITP on resale
- ITP: transfer tax on a resale home in Spain, by region
- Madrid property tax: 6% ITP and the AJD scale
- Murcia property transfer tax: 7.75% ITP since July 2025
- Property transfer tax in Andalusia: 7% ITP and AJD
- Reduced transfer tax for young buyers in Spain, by region
- Stamp duty (AJD) on a Spanish mortgage: the lender pays
- Valencian Community: 9% ITP since June 2026, 11% over €1m
- VAT and stamp duty on a new home in Spain
Sources
- Real Decreto Legislativo 1/1993, TRLITPAJD, arts. 10, 30.1 (BOE, consolidated text updated 21/03/2026) (consulted 15 October 2026)
- Real Decreto Legislativo 1/2004, texto refundido de la Ley del Catastro Inmobiliario, disposición final tercera (BOE) (consulted 15 October 2026)
- Sede Electrónica del Catastro, valor de referencia (consulted 15 October 2026)
- Decreto Foral Legislativo 129/1999, Navarre, art. 7 (BOE) (consulted 15 October 2026)