Municipal Capital Gains Tax: Recover Overpayments and Optimise the New Methodology

The Impuesto sobre el Incremento del Valor de los Terrenos de Naturaleza Urbana (IIVTNU — municipal capital gains tax), known in Spain as plusvalía municipal, taxes the increase in value of urban land during the period of ownership by the transferor. Governed by Articles 104 to 110 of Royal Legislative Decree 2/2004 (the Consolidated Local Treasury Act), the tax was the subject of several Constitutional Court decisions — STC 26/2017, STC 37/2017, and definitively STC 182/2021 — which declared the previous legislation unconstitutional for violating the ability-to-pay principle when the resulting liability exceeded the real gain obtained. Royal Decree-Law 26/2021, of 8 November, reformed the taxable base to introduce the actual gain calculation method as an alternative to the objective method, giving the taxpayer the option to choose the more favourable one. For earlier transfers, STC 182/2021 opened the door to refund claims within the four-year limitation period.

This service is part of our legal advisory practice.

IIVTNU: what the municipal capital gains tax is and how it is calculated after RDL 26/2021

The municipal capital gains tax is a mandatory local tax that arises each time urban land is transferred: by sale, gift, inheritance, dation in payment, exchange, or any other legal transaction resulting in the transfer of ownership or the creation or transfer of rights of enjoyment. The liable taxpayer is the transferor in onerous transfers and the acquirer in gratuitous transfers (gifts and inheritances).

After the reform by RDL 26/2021, the taxpayer may choose between two methods to calculate the taxable base:

Objective method: the taxable base is calculated by multiplying the cadastral value of the land at the date of transfer by the coefficients approved by the Ministry of Finance for each period of ownership (from zero to one year, one to two years, and so on up to twenty years or more). Coefficients are revised annually and must also be updated by local authorities themselves. This method is predictable and does not require proving acquisition values.

Actual gain method: the taxable base is the positive difference between the transfer value and the acquisition value, taking only the proportionate part attributable to the land based on the cadastral value ratio. This method reflects the real economic increase in land value during the period of ownership. It is more favourable when the property was acquired recently at market price or when land appreciation has been modest.

The choice of method is a legal act with significant economic consequences. In markets where land has appreciated substantially since acquisition (Madrid, Barcelona, coastal areas in certain periods), the objective method may be more favourable than the actual gain method. In recent transactions or in stable markets, the reverse is usually true.

STC 182/2021: impact of the Constitutional Court decision and which transfers can be claimed

STC 182/2021, published in the Official State Gazette on 25 November 2021, was the culmination of a lengthy process of constitutional challenge to the IIVTNU. Decisions STC 26/2017 and STC 37/2017 had already declared unconstitutional the application of the tax where there was no increase in land value (transfer at a loss). STC 182/2021 took the decisive step: it declared the taxable base calculation method unconstitutional as a general matter, as it was confiscatory in cases where the tax liability exceeded the real gain obtained.

The decision expressly established that its effects do not reach consolidated legal situations: final assessments or self-assessments that were not challenged, proceedings concluded with a final judgment, and time-barred assessments. Only taxpayers who, on the date of publication or within four years before the claim, had a pending challenge, had appealed, or were still within the four-year limitation period from payment can benefit from the decision.

In 2026, the limitation period allows claims for transfers with a payment date from January 2022. Each passing month closes the door on transfers from the same month four years earlier. The urgency of acting is real for taxpayers who paid in 2022 and have not yet claimed.

Objective method versus actual gain method: how to choose the most favourable calculation

The choice of calculation method is the element with the greatest economic impact in the current management of the IIVTNU for the taxpayer. The difference between the two methods can exceed 50% of the liability in certain transactions.

A correct analysis requires the following data: deed of acquisition (with the purchase price), transfer deed or declared value (with the sale price), current cadastral certificate of the property (with the cadastral value of the land and the total cadastral value), and the fiscal ordinances of the relevant local authority (to verify local tax rates and applicable coefficients).

With this data, we calculate the taxable base under both methods and the resulting liability. The difference between the methods can be especially significant in the following scenarios:

Properties acquired before 2015 in areas of high appreciation: the objective method applies the maximum coefficients approved by the Treasury for 20 years or more, which may be substantially lower than the actual value difference if the market has appreciated significantly. In this case, the objective method may be more favourable.

Properties acquired between 2015 and 2020 in areas of moderate appreciation: the purchase price already incorporates part of the historical appreciation, which reduces the actual value difference. The actual gain method may be more favourable.

Properties acquired at any time with a high purchase price or a very high cadastral land value relative to the total: the actual gain method produces a proportionally larger taxable base if the land represents a large proportion of the total cadastral value. In this case the objective method may be more favourable.

Recovery of undue payments: limitation period, documentation, and procedure before the local authority

The procedure to recover overpaid municipal capital gains tax depends on whether the tax was assessed by self-assessment (filed by the taxpayer) or by a formal assessment raised by the local authority.

Self-assessment (the most common system): the route is self-assessment amendment under Art. 120 of the General Tax Act (Ley General Tributaria). The taxpayer files the amendment form with the local authority showing the new taxable base calculated under the more favourable method or evidencing non-chargeability, and requests refund of the undue payment. The local authority has six months to resolve the claim. If it fails to do so or rejects the application, the matter may be appealed before the TEAM (Tribunal Económico-Administrativo Municipal — Municipal Tax Tribunal) and subsequently before the administrative court.

Local authority assessment (less common in municipalities without a self-assessment ordinance): the route is the undue payment refund claim under Art. 221 of the General Tax Act, or an administrative appeal (recurso de reposición) before the local authority, followed by the TEAM and the administrative court.

The essential documentation is: deed of acquisition with the price or reference value; deed of transfer; cadastral certificate of the property at the date of transfer; proof of tax payment; and comparative calculation of the methods.

Non-chargeability: transfers with no increase in value and transfers at a loss

Article 104.5 of RDL 2/2004, in its current wording following RDL 26/2021, expressly establishes that the IIVTNU does not arise where the taxpayer evidences the absence of any increase in land value by providing the acquisition and transfer deeds. If the transfer value equals or is below the acquisition value in the land-attributable proportion, there is no taxable event.

In practice, non-chargeability is evidenced by comparing the land values calculated under the actual gain method: if the difference is zero or negative, the tax does not arise. Some local authorities apply the cadastral value of the land rather than the sale and purchase price for the calculation, which may produce different results. In such cases it may be necessary to challenge the assessment raised by the local authority.

Non-chargeability also applies in inheritances and gifts where the value declared for inheritance and gift tax purposes in the land-attributable portion equals or is below the acquisition value by the deceased or donor. Co-ordination with the Inheritance and Gift Tax (Impuesto sobre Sucesiones y Donaciones — ISD) assessment is important to avoid inconsistencies between declarations that the tax authority might use against the taxpayer.

Sources and Regulatory Framework

• BOE — Royal Legislative Decree 2/2004 (TRLHL), Arts. 104–110
• BOE — Royal Decree-Law 26/2021, of 8 November (post-STC 182/2021 reform)
• Constitutional Court — STC 182/2021, of 26 October
• Ministry of Finance — IIVTNU coefficients