Thermo-Modernization Relief for a Sole Proprietorship (JDG) in Poland (2026)
Thermo-modernization relief (ulga termomodernizacyjna) in a sole proprietorship (JDG) in Poland in 2026 — deducting the cost of building insulation. Conditions, limits, what can be deducted.
The thermo-modernization relief (ulga termomodernizacyjna) lets you deduct an additional 50% of the cost of insulating a building. If you own a building and are insulating it, you can save on tax.
In this guide, I explain the rules of the thermo-modernization relief for a sole proprietorship (JDG — a Polish registered business run by one individual) in Poland in 2026.
What is the thermo-modernization relief?
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The relief allows you to deduct an additional 50% of thermo-modernization costs for a building (150% total deduction).
What can you deduct?
- Insulation of the building (expanded polystyrene, mineral wool)
- Windows and doors (energy-efficient)
- Boilers and stoves (replacement with more efficient models)
- Installations (renewable energy sources — solar panels, heat pumps)
Conditions
- Only on the tax scale and flat tax (not on the lump-sum tax)
- The building must be related to the business activity
- Separate cost records
FAQ
Does it work on the lump-sum tax (ryczałt)?
No. Only on the tax scale or flat tax.
Do I have to own the building?
Yes. The building must be connected to the sole proprietorship (JDG).
Need help?
I run sole-proprietorship accounting with reliefs — thermo-modernization, livestock, R&D (research and development). From 49 zł + VAT per month.
Write to [email protected] or visit oxyok.com/pl.
Note: Thermo-modernization relief: additional 50% of costs (150% total). Only on the tax scale and flat tax. The building must be related to the business. Before making a decision, consult an accountant.
Questions about accounting?
I run accounting for sole proprietors from 49 zł + VAT per month.
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