Doctrine by topic · DGT Observatory

Modification of the Tax Base: 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

Refined position High confidence 74 rulings · 2014–2026

Current position

The modification of the tax base due to non-payment or extinction of the credit right requires the issuance of a corrective invoice. In cases of uncollectible credits, the taxpayer must prove the collection claim through means of evidence that allow for the verification of the content, sender, recipient, and the result of the delivery. The rectification must be carried out within a maximum period of four years from the notification of the extinction of the debt or the reliable attempt at notification.

The position of the DGT has evolved from a general definition of the modification of the tax base towards a more detailed regulation of evidentiary requirements and deadlines. It has moved from establishing strict conditions for judicial claims to allowing any means of evidence admitted in Law to prove collection management. Current doctrine specifies the calculation of the rectification period linked to the notification of the extinction of the debt.

Turning points

  1. V3096-16

    Introduces the exclusion of the modification of the tax base regarding the portion of credits that enjoy a valid security interest.

  2. V0212-23

    Flexibilizes the proof of collection by allowing any means of evidence admitted in Law, provided that the identity of the parties and the result of the delivery can be verified.

Analysis based on 71 of 74 rulings with a stated position. Updated 23 September 2026.

Rulings on this topic

24

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