Doctrine by topic · DGT Observatory

ICIO: DGT doctrinal evolution

How the DGT's position on this topic has evolved, and the rulings it rests on.

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How the DGT's position has evolved

Settled doctrine High confidence 22 rulings · 2014–2025

Current position

The tax base for the ICIO (Tax on Construction, Installations and Works) is composed of the real cost of the work, allowing for the modification of the final assessment in the event of exceptional price revisions. Elements constructed by third parties outside of the construction site do not form part of the tax base, unless they are inseparable technical components or their installation is necessary. The tax ordinance determines whether the deduction provided in article 103.3 of the TRLRHL (Revised Text of the Law Regulating Local Treasuries) applies to the full tax liability or the reduced tax liability.

The DGT's position remains constant regarding the limits of municipal autonomy to set tax rates and the composition of the tax base. Clarifications have been provided regarding the exclusion of elements constructed off-site and the possibility of adjusting the tax base through price revisions. The doctrine has extended to the application of deductions and the nature of exemptions for public entities.

Turning points

  1. V1515-17

    Establishes that elements constructed by third parties outside of the construction site do not form part of the tax base if they are not inseparable technical components or do not integrate into the project.

  2. V0173-22

    Specifies that industrial profit, general expenses, health and safety expenses, and quality control expenses do not form part of the tax base if they appear in the project.

  3. V2454-23

    Allows the City Council to modify the tax base for the final assessment in the event of an increase in the real cost due to an exceptional price revision.

Analysis based on 20 of 22 rulings with a stated position. Updated 25 September 2026.

Rulings on this topic

22
V3032-17 22 Nov 2017

Unpaid labour is excluded from the ICIO taxable base

SG de Tributos Locales
iciobase imponiblecoste real y efectivocoste de ejecución materialsujeto pasivo TRLRHL — RDLeg 2/2004 de Haciendas Locales art. 100TRLRHL — RDLeg 2/2004 de Haciendas Locales art. 101
Affects CompanyExpat · Non-residentIndividual
V1323-14 16 May 2014

Municipalities may set ICIO tax rates up to 4% using a single rate

SG de Tributos Locales
iciotipo de gravamenordenanza fiscalautonomía localhecho imponible TRLRHL — RDLeg 2/2004 de Haciendas Locales art. 15.1TRLRHL — RDLeg 2/2004 de Haciendas Locales art. 16.1
Affects CompanyExpat · Non-residentIndividual
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