How the DGT's position has evolved
Current position
The modification of the tax base and the imputed tax amounts requires the issuance of a credit note. In cases of a decrease in tax amounts, the taxable person must refund the amount to the recipient. In insolvency proceedings, the tax base is only modified upwards under specific circumstances regarding the conclusion of the proceedings.
The DGT's position remains constant in requiring credit notes to modify bases and amounts. The doctrine has progressively specified the temporal and procedural requirements for the reduction of bases due to non-payment or debt forgiveness. No change in criterion is observed, but rather a technical application of current regulations to specific scenarios.
Turning points
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Establishes temporal and collection management requirements for the reduction of the tax base due to uncollectible credits, requiring the passage of one year or six months depending on the volume of operations.
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Limits the upward modification of the tax base in insolvency contexts exclusively to the causes of conclusion provided for in article 465.1 of the Consolidated Text of the Insolvency Law.
Analysis based on 34 of 34 rulings with a stated position. Updated 24 September 2026.