How the DGT's position has evolved
Current position
The deduction base is determined by subtracting the amounts subsidized through public aid from the investment made. If the subsidy is granted in a tax year subsequent to the year of the deduction, the tax situation must be regularized by adding the unduly deducted amounts plus late payment interest to the net tax liability.
The DGT's position on the deduction base does not show a single thematic evolution, as the rulings address different concepts (housing, energy-saving works, donations). Regarding subsidies, the DGT maintains the obligation to discount aid from the base and establishes the regularization procedure for subsequent subsidies.
Turning points
-
Establishes that the deduction base for energy rehabilitation works is the difference between the investment made and the amount of the subsidy granted.
-
Specifies that if the subsidy is granted in a subsequent tax year, the tax situation must be regularized by adding the deducted amounts plus late payment interest to the net tax liability.
Analysis based on 48 of 48 rulings with a stated position. Updated 18 September 2026.