How the DGT's position has evolved
Current position
Analogy is prohibited when intended to extend tax benefits or exemptions beyond the cases provided for in the law. Regarding kinship for Inheritance and Gift Tax (ISD), the Civil Code applies supplementarily, without admitting socio-affective bonds to grant reductions. However, analogy is admissible to fill gaps in the determination of the tax base when no specific rule exists.
The DGT's position is constant in prohibiting the application of analogy to expand tax benefits or exemptions, as observed in the rulings of 2014, 2016, 2017, 2019, and 2025. The only exception detected occurs when analogy is used to supply the lack of a quantification rule, allowing the determination of the tax base in cases of regulatory gaps.
Turning points
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Allows the use of analogy to fill regulatory gaps in the determination of the tax base, applying article 14.2 of the TRLRHL in the absence of a specific rule.
Analysis based on 25 of 25 rulings with a stated position. Updated 24 September 2026.