How the DGT's position has evolved
Current position
The release of co-debtors in a loan with mortgage security through a public deed is subject to AJD (Stamp Duty). The taxable person is the one who requests the execution of the notarial document, as the operation is classified as a debt and not as a transfer of assets or rights. The applicable tax rate is that of the Autonomous Community or 0.50 percent.
The DGT's position does not show a single doctrinal evolution, but rather addresses various scenarios of mortgage operations. The exemption in novations affecting the interest rate or term is maintained (V5438-16), and the proportionality of payments in loans involving multiple assets is established (V0707-23). The doctrine remains constant in applying the regulations according to the nature of the modification or the event (death, divorce, or release of debt).
Turning points
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Specifies that the AJD exemption in novations is strictly limited to modifications of the interest rate or the term, excluding changes in the amortization method or principal.
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Establishes that in loans involving multiple assets, each payment covers an aliquot part of each asset, preventing the discretionary attribution of amortizations to a specific asset.
Analysis based on 52 of 56 rulings with a stated position. Updated 23 September 2026.