How the DGT's position has evolved
Current position
The substitution of a loan does not exhaust the right to deduction if the new loan is intended to amortize the previous one. To maintain the right, the cancellation of the original loan and the signing of the new contract must occur in a single act. Only the proportional part of the installments and expenses attributable to the loan intended for the dwelling is deductible, excluding any increase in the principal for other purposes.
The DGT's position remains constant at the core of the criterion, confirming that substitution does not extinguish the deduction. The evolution shows greater precision by explicitly including the deductibility of appraisal, notary, and registry expenses when the operation is carried out in a single act. The requirement of simultaneity is maintained to avoid the loss of the right.
Turning points
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It is specified that if the cancellation and the signing of the new contract occur in a single act, the expenses generated by the operation are also deductible.
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The necessity is established that the cancellation and the signing of the new contract must occur in a single act or simultaneously to maintain the right.
Analysis based on 46 of 50 rulings with a stated position. Updated 18 September 2026.