How the DGT's position has evolved
Current position
Impairment losses on securities representing participation in capital are not deductible if the requirements of article 21 of the Law on Corporate Tax (LIS) are met. A participation of at least 5% must be maintained uninterruptedly during the previous or subsequent year. Furthermore, the non-resident entity must be subject to an analogous foreign tax of at least 10% or reside in a country with a double taxation treaty.
The sequence does not show an evolution on a single concept, but rather deals with diverse matters such as objective estimation, deductibility of expenses, fair value, and impairment of securities. There is no single doctrinal trajectory, but rather isolated criteria on different factual scenarios. The position on the deductibility of impairment losses remains in line with the Corporate Tax (IS) regulations.
Analysis based on 63 of 68 rulings with a stated position. Updated 23 September 2026.