Despite being immersed in the Income Tax return campaign, there are still many people who have not filed personal income tax. For a few weeks now you can request the draft tax returnbut it is advisable not to accept it without reviewing and checking if it includes all applicable deductions, such as the one that allows savings of up to 1,300 euros for having a mortgage.
This is the deduction for investment in habitual residencewhich is still in force under a transitional regime, this means that it is not applicable to all mortgages, it depends on the date. Although this deduction disappeared for new purchases starting in 2013, it is still one of the most relevant for those who purchased their home before that date, so reviewing it can mean significant savings on the Income Tax return.
As explained by the Tax Agency itself in its manualthis deduction allows 15% of the amounts paid for the mortgage to be deducted, with a limit of 9,040 euros per year, which translates into a maximum saving of 1,356 euros per taxpayer. In the case of mortgages with two holders who submit the declaration individually and meet the requirements, this benefit can be doubled, reaching up to 2,712 euros together.
Who can apply the mortgage deduction
As has been said, not all mortgage holders can benefit from this deduction. The main requirement is that the home has been acquired before January 1, 2013, since, as stated in the 2025 Income Manual of the Tax Agency, this tax advantage is only maintained in a transitional regime for those cases.
Furthermore, as a general rule, the taxpayer must have applied this deduction in a financial year prior to that date. However, the administrative criterion itself allows exceptions, and those who did not apply it at the time because they were not required to declare or because they did not have enough full quota can also benefit.
Added to this is that the home must be considered a habitual residence, an essential requirement to be able to apply the deduction.
What happens if the mortgage is modified
Another common doubt has to do with changes in the loan. In this sense, the Tax Agency clarifies in its manual that modifying the mortgage does not automatically mean losing the deduction.
For example, the right is maintained in cases of changes in the interest rate, in the repayment period or in situations of subrogation or replacement of the loan.
In the event of a capital increase, the deduction may also continue to apply, although only on the part of the loan linked to the original acquisition of the primary residence, provided that the requirements of the transitional regime are met.