Key aspects of inheritance tax on property transfers

To precisely determine the amount payable when managing property inheritance tax, it is necessary to analyse various technical factors set by the general legal framework before examining the specific benefits of each autonomous community:

• Tax base and Reference Value: Since the entry into force of the legislation on measures to prevent and combat tax fraud, the tax base for real estate is determined using the Cadastral Reference Value. This indicator set by the Directorate-General for Cadastre constitutes the minimum value for tax purposes, unless the value specified in the inheritance deed is higher.
• Kinship groups: The amount payable varies according to the degree of kinship between the deceased and the heir. Group I covers descendants and adoptees under 21 years of age; Group II includes descendants and adoptees aged 21 or over, spouses, ascendants and adopters; Group III includes second and third-degree collateral relatives (siblings, uncles, aunts, nephews, nieces); and Group IV covers fourth-degree or more distant collaterals, as well as unrelated individuals.
• Filing deadline and extensions: The general deadline for submitting the self-assessment for the tax is six months from the date of the deceased person's death. The regulations allow for an extension of an additional six months, provided this request is processed within the first five months of the initial period.

Analysis of property inheritance tax by Autonomous Community

Regional legislative powers allow each region to establish reductions in the tax base and tax allowances on the final liability. The regulations currently in force across the four analysed territories are detailed below.

Comunidad de Madrid

The Comunidad de Madrid has a tax framework aimed at minimising the tax burden on family asset transfers. For transfers belonging to Kinship Groups I and II, a 99% tax allowance is applied to the tax liability for property inheritance tax. As a result, spouses, children and parents pay only 1% of the calculated tax duty.

Furthermore, the Madrid region grants a 25% tax allowance for transfers between siblings, uncles, aunts, nephews and nieces (Kinship Group III), reducing the financial impact for collateral heirs. On the other hand, in the specific case of Officially Protected Housing (VPO) located in the Comunidad de Madrid, it is essential to check the protection regime and the applicable descalificación (declassification) regulations. If the property retains its public protection status, the valuation for tax purposes must align with the maximum legal sale value set by the regional administration, a factor that directly determines the tax base.

Comunitat Valenciana

The tax system applicable to property inheritances in the Comunitat Valenciana has undergone reforms designed to reduce the tax burden on families. Valencian regulations establish a 99% tax allowance on the duty payable for inheritances received by descendants, adoptees, spouses, ascendants and adopters (Groups I and II).

Additionally, regional legislation in Valencia provides for specific tax base reductions when the transferred property was the deceased's main residence. This reduction can reach up to 95% of the property's tax value, subject to statutory cap limits, provided that the beneficiaries retain ownership of the property for the mandatory retention period required by regional law.

Illes Balears

In the Balearic Islands, the regulation of property inheritance tax provides particularly favourable tax treatment for the immediate family. Property transfers between parents, children, grandparents and spouses (Groups I and II) enjoy a 100% tax allowance on the tax liability, effectively waiving payment for these inheritances.

For second and third-degree collateral relatives by blood (Group III), such as siblings, regulations in the Illes Balears establish gradual reductions and tax allowances on the liability that can reach between 25% and 50%, depending on whether the deceased had no descendants or according to the specific criteria set out in regional rules.

Aragón

The tax framework of the Autonomous Community of Aragon features specific reduction and allowance mechanisms to safeguard family property assets. For heirs in Group I, the tax liability benefits from a tax allowance of practically 100%.

For Group II taxpayers, Aragon applies tax base reductions and tax allowances on the final liability that can reach 99%, subject to certain limits on the total estate value. Regarding the deceased's primary residence, Aragonese regulations allow a reduction of up to 99% of the property value in the tax base for spouses, ascendants or descendants, subject to fulfilling the ownership retention requirements stipulated in the Aragon Tax Code.

Regional tax base reductions for inheriting a main residence

Beyond the allowances applicable to the final tax liability, the governing legislation allows for a reduction of the tax base when the inherited property was the deceased's primary residence. National legislation establishes a 95% reduction on the property's value, although autonomous communities have exercised their legislative power to increase this percentage or modify eligibility criteria:

1. Property retention: Most regional laws require the property to be retained within the heir's assets for a period that typically ranges between two and five years, depending on the region of residence.
2. Quantitative limits: Each autonomous community sets a maximum cap per taxpayer participating in the allocation of the primary residence.
3. Required kinship: The reduction is generally targeted at spouses, descendants and ascendants, and is extended in certain cases to collateral relatives over 65 years of age who lived with the deceased during the years prior to their death.

Common tax declaration errors and the impact of municipal capital gains tax

The settlement process for property inheritance tax requires a thorough review of valuations and technical documentation to avoid errors that could result in penalty proceedings or valuation audits by the Tax Administration. Among the most common mistakes are:

• Failing to check the Cadastral Reference Value: Declaring a property below the value set by the Cadastre automatically triggers a supplementary tax assessment for the difference, along with corresponding late-payment interest.
• Incorrect application of regional tax reliefs: Settling the tax without correctly stating the tax residence connection (the deceased's main residence) can lead to the unexpected loss of regional tax allowances specific to Madrid, Valencia, Balearic Islands or Aragon.
• Forgetting Municipal Capital Gains Tax (Plusvalía Municipal): In addition to inheritance tax, receiving an urban property requires filing municipal capital gains tax (Impuesto sobre el Incremento de Valor de los Terrenos de Naturaleza Urbana) with the local town hall where the property is located. This tax levies the increase in land value and has its own deadlines and calculation formulas (objective or actual value method).

Planning and professional involvement in estate management

Managing an inheritance involving real estate assets requires coordinating the inventory preparation, official asset valuations, signing the deed of allocation before a notary, and the subsequent registration of titles at the Land Registry. Proper planning allows for the optimisation of the overall tax impact and ensures strict compliance with current legislation.

At Sky Real Estate, we have a specialised team that advises heirs through every stage of the registry, tax and real estate process. The strength of our legal practice has been recognised in the Sky Law European Legal Awards 2023-2025, providing a service tailored to the needs of each estate. Furthermore, we operate as a regulated entity registered under mortgage credit intermediaries ICI D-286 Banco de España, facilitating comprehensive financial solutions if liquidity is required to pay the corresponding taxes.

If you need assistance calculating the tax settlement for your property or processing the inheritance allocation in Madrid, Comunitat Valenciana, Illes Balears or Aragon, contact our property lawyers to receive a personalised analysis and protect your property rights.