Save up to €1,000 on your income tax by replacing your home's windows in 2026

Replacing the windows in your home not only improves comfort and insulation, it can also represent a Save up to €1,000 on your income tax return.

Thanks to the deductions for energy efficiency improvement works, it is possible to benefit from this deduction provided that certain technical and administrative requirements are met.

In this article we explain clearly how this deduction works and what role it plays. Afandecor to help you throughout the entire process.

What does the personal income tax deduction consist of?

The deduction in personal income tax for energy efficiency improvement works allows save on your tax return when actions are taken to reduce the energy consumption of the home, such as changing windows.

This deduction will be valid throughout the year 2026 and it is applied to the amount of the action, provided that the improvement is justified by Energy Efficiency Certificates (EEC) broadcast before and after the play.

There are two main assumptions of deduction, depending on the level of energy improvement achieved.

Main requirements

To be eligible for any of the deductions, it is essential to meet these requirements:

• To have a Initial Energy Efficiency Certificate (before construction).
• To have a Final Energy Efficiency Certificate (after construction).
• That the action entails a demonstrable energy improvement.
• Keep invoices and installation documentation.

The deduction It cannot be confirmed until the final certificate is issued, since it depends on the actual savings achieved.

First deduction scenario (the most common)

This is the most common case when changing windows.

Requirement

• Achieving a minimum reduction of 7 % in the demand for heating and cooling of the home.

Applicable deduction

• 20 % on the maximum base of 5.000 €.
• Maximum deduction: €1,000.

Practical examples:

• Investment of €3,000 → €3,000 x 20 % = €600 deduction.
• Investment of €6,000 → €6,000 x 20 % = €1,200, but the limit applies → €1,000 deduction.

Second deduction scenario (greater savings)

A higher deduction may be available if any of these requirements are met:

• Reduce by one 30 % non-renewable primary energy consumption, either
• Get a Energy rating A or B in the final certificate.

Applicable deduction

• 40 % on a maximum basis of 7.500 €.
• Maximum deduction: €3,000.

Practical examples:

• Investment of €5,000 → €5,000 x 40 % = €2,000 deduction.
• Investment of €10,000 → €10,000 x 40 % = €4,000, but the limit applies → €3,000 deduction.

What does Afandecor manage?

At Afandecor we don't just manufacture and install custom windows. We also We help the client with the technical and documentary aspects. necessary in order to be eligible for the personal income tax deduction.

Specifically:

• We coordinate the Preparation of energy performance certificates (initial and final EEC).
• We verified that the installation meets the required standards.
• We provide the necessary documentation to submit with your tax return.

In this way, the client avoids errors and complex procedures that could prevent the deduction.

Conclusion

Since it is a tax deduction, It is compatible with other aid and subsidies, such as the Scrappage scheme, the Next Generation Funds or regional government subsidies. Replacing windows is an investment in comfort, insulation, and energy efficiency. If done with the proper documentation, it can also represent a significant savings in the personal income tax return.

At Afandecor we accompany the client throughout the entire process: from the manufacture and installation of the windows to the management of the necessary certificates so that they can benefit from the deduction in a clear, transparent and uncomplicated way.