How the DGT's position has evolved
Current position
The right to deduction expires if it is not exercised within the four-year period from the accrual date according to Law 37/1992. In order to request the refund of uncompensated excess amounts, it is an indispensable requirement that the right to deduct has been correctly exercised in the appropriate tax return. If the amounts are not included in the self-assessments within the period, the right to a refund does not arise.
The DGT's position has moved from a more flexible interpretation in 2015 to a restrictive and consolidated doctrine. It has been specified that the possibility of requesting the refund of uncompensated excesses is not an autonomous right, but rather depends on having previously exercised the right to deduct within the period. The rulings of 2020, 2021, and 2022 reinforce this requirement of having recorded the amounts in the self-assessment to avoid the expiration of the right to a refund.
Turning points
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Establishes that the refund of uncompensated excesses is only applicable if the right to deduct was correctly exercised at the time, preventing the refund if the right has already expired due to not having been exercised.
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Clarifies that if the taxable person does not include the amounts in their self-assessments within the period, the right to a refund does not arise, limiting the application of jurisprudence regarding unjust enrichment.
Analysis based on 17 of 19 rulings with a stated position. Updated 25 September 2026.