How the DGT's position has evolved
Current position
Additional provision 50 of the Personal Income Tax Law (LIRPF) requires deducting amounts subsidized by public aid from the deduction base. If the subsidy is granted in a tax year subsequent to the deduction, the tax situation must be regularized by adding the unduly deducted amounts plus late payment interest to the net tax liability. In cases of refunds due to floor clauses, the amount is not included in the taxable base; however, if these amounts were part of the base for primary residence deductions, the unduly deducted amount must be added to the net tax liability, unless they are used to reduce the principal of the loan.
The DGT's position remains constant regarding the obligation to add to the net tax liability the amounts unduly deducted when the right to the deduction is lost. The doctrine has applied this criterion both to the loss of the right due to the destination of funds and to the refund of amounts due to floor clauses. The latest ruling introduces the obligation to regularize via the net tax liability when subsidies are received after the deduction.
Turning points
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Establishes that the refund of amounts due to floor clauses requires adding the unduly deducted amounts to the net tax liability if they were part of the primary residence deduction base.
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Determines that the granting of subsidies subsequent to the deduction requires regularization by adding the unduly deducted amounts plus late payment interest to the net tax liability.
Analysis based on 53 of 54 rulings with a stated position. Updated 23 September 2026.