On paper, the procedure looks straightforward. A property owner pays local tax, files a declaration, and moves on. In practice, the 2025 amendments to Polish real estate tax rules have redrawn the boundary between taxable and non-taxable structures in ways that catch even experienced finance teams off guard. The new statutory definitions of "building" and "structure" – effective from 1 January 2025 – now determine whether a given asset is taxed by area (a far lighter burden) or by value (potentially several times higher). Getting that classification wrong can cost a mid-sized commercial portfolio hundreds of thousands of zlotys per year.

Poland's real estate tax framework was amended by legislation that took effect on 1 January 2025, introducing standalone definitions of "building" (budynek) and "structure" (budowla) directly into the Local Taxes and Fees Act (ustawa o podatkach i opłatach lokalnych). Before the amendment, Polish tax authorities borrowed those definitions from construction law, creating persistent disputes. The new rules establish independent tax-law criteria: a building is a structure with a roof, walls, and a foundation, permanently attached to the ground; everything else that is not a building or land qualifies as a structure and is taxed at up to 2% of its value. Municipalities set their own rates within the statutory ceiling, and the deadline for filing the annual declaration with the relevant municipality is 31 January each year.

This guide walks through the 2025 definitional framework step by step. It covers how the new definitions apply in practice, which assets are most at risk of reclassification, how three common business scenarios play out under the new rules, and what compliance steps owners should take before the next filing cycle. The FAQ section addresses the most frequent misconceptions we encounter from clients across commercial real estate, manufacturing, and infrastructure.

Why did Poland redefine "building" and "structure" for tax purposes?

The core problem was definitional dependency. For decades, Polish tax law lacked its own definitions. Tax authorities and courts routinely referred to the Construction Law Act (Prawo budowlane) to determine whether an asset was a building or a structure. That cross-reference generated a decade of conflicting rulings from administrative courts, including the Supreme Administrative Court (NSA) and the Constitutional Tribunal (Trybunał Konstytucyjny). Taxpayers faced genuine legal uncertainty about assets such as industrial tanks, photovoltaic installations, and underground networks.

The Constitutional Tribunal issued a landmark ruling finding that the definitional gap violated the principle of legal certainty. Parliament was given a deadline to introduce autonomous tax-law definitions. The 2025 legislation responded directly. It inserted definitions into the Local Taxes and Fees Act itself, cutting the link to construction law. The National Court Register (KRS) and the Polish Financial Supervision Authority (KNF) – as regulators of entities that often hold large real estate portfolios – had both flagged the compliance burden in earlier consultation rounds.

The practical consequence is significant. An asset previously classified as a building under construction law might now fail the tax-law building test. If it does, it falls into the structure category and is taxed at up to 2% of its initial value (or replacement value where the asset is fully depreciated). For a warehouse complex valued at PLN 50m, the annual difference between building-rate and structure-rate tax can exceed PLN 800,000. That is not a rounding error – it is a material line item on any P&L.

What do the new 2025 definitions actually require?

Under the amended Local Taxes and Fees Act, a "building" must satisfy four cumulative conditions: it must be permanently attached to the ground; it must have a roof; it must have walls; and it must be structurally self-contained. The definition is narrower than its construction-law predecessor. Structures that relied on an adjacent building for load-bearing support, or that lacked permanent ground attachment, may no longer qualify as buildings for tax purposes. The filing deadline of 31 January 2025 – or 14 days from acquisition of a new property – remains unchanged.

A "structure" is now defined residually. Any object that is not land, not a building, and is connected with conducting business activity, qualifies as a structure. The 2025 law also introduced an explicit annex listing specific asset categories: transmission networks, fuel storage tanks, solar panel installations, wind turbines, car parks, roads within a private plot, and retaining walls. That list is illustrative, not exhaustive – but it signals the legislature's intent to capture value-rich technical assets that were previously disputed.

  • Photovoltaic installations: now explicitly listed as structures, taxed at up to 2% of initial value
  • Underground pipelines on private land: reclassified from building appurtenances to standalone structures
  • Car parks (surface-level): treated as structures unless enclosed by permanent walls and a roof
  • Industrial tanks: structures regardless of whether they are anchored to a building foundation
  • Retaining walls and embankments: structures if used in connection with business activity

One important nuance: the 2025 definitions apply only for real estate tax purposes. Construction permits, building classifications under planning law, and accounting depreciation categories remain governed by their own frameworks. A solar farm may be a structure for tax purposes and a technical installation for accounting purposes simultaneously. That divergence creates transfer pricing documentation risks for groups that allocate real estate costs between related entities – a point we return to in the cross-border section below.

How do the three main business scenarios play out under the new rules?

Three client profiles illustrate the range of impact. Each scenario highlights a different reclassification risk and a different compliance response. Understanding which scenario matches your situation is the fastest way to prioritise your 2025 review.

Scenario 1 – Manufacturing company with industrial infrastructure. A manufacturer in the Mazowieckie region holds a production hall (clearly a building), a transformer station, and an internal road network connecting the site. Under the old framework, the transformer station was treated as part of the hall. Under the 2025 definitions, it is a standalone structure. The internal road network – previously a building appurtenance – is now also a structure. We secured a reversal of a tax surcharge exceeding PLN 1.4m for a manufacturing client in the Mazowieckie region (autumn 2025) by demonstrating that the transformer station had been incorrectly assessed at the building rate for three prior years. The corrected filing generated a refund claim, but only because the client acted within the five-year limitation period for overpayment claims.

Scenario 2 – IT company with data centre assets. Technology companies often own or lease data centres containing raised floors, precision cooling systems, and UPS installations. Each of those elements is now a candidate for structure classification. The initial value of precision cooling infrastructure in a mid-size data centre can reach PLN 20m. At 2% tax, that is PLN 400,000 per year – a cost that most IT companies have not budgeted for. The IP Box regime, which some technology companies use to reduce effective CIT rates, provides no shelter from local real estate tax. The two regimes operate independently.

Scenario 3 – Foreign investor acquiring Polish commercial real estate. Our team obtained interim measures protecting assets worth over EUR 3m for a German investor's subsidiary in Lower Silesia (spring 2026) during a dispute over the tax classification of a logistics hall's loading canopies. The canopies – permanent steel structures attached to the main hall – were reclassified as structures by the local tax authority, triggering a back-assessment. The investor had relied on the seller's due diligence report, which predated the 2025 amendments. This scenario illustrates why acquisition due diligence must now include a specific 2025-definitions audit alongside the standard title and planning review.

What compliance steps should property owners take now?

The 2025 framework creates both a risk and an opportunity. Owners who have been over-paying – treating structures as buildings and applying the lower area-based rate – may have refund claims. Owners who have been under-paying face back-assessments, interest at 8% per annum, and potential surcharges of up to 150% of the underpaid amount. Acting now, before a tax authority audit, is the only way to access the voluntary disclosure mechanism that reduces the surcharge to 10%.

The compliance review should follow a four-stage sequence. First, prepare a full asset inventory against the new building and structure definitions. Second, verify the initial values recorded in the fixed-asset register – these are the tax base for structures, and outdated values (especially for fully depreciated assets, where replacement value applies) are a common source of under-assessment. Third, check whether any assets acquired or constructed in 2024 were reported using pre-2025 classification logic. Fourth, assess whether the municipality's applicable rate is the maximum statutory rate or a lower local rate – rates vary significantly across Poland's 2,477 municipalities.

  • Asset inventory: map every structure and building against the 2025 statutory definitions
  • Value verification: confirm initial or replacement values in the fixed-asset register
  • Declaration review: compare 2024 declarations with corrected 2025 classifications
  • Rate audit: confirm the applicable municipal rate – it may be below the 2% ceiling
  • Voluntary correction: file amended declarations before any audit commences

Transfer pricing teams should also note the interaction with intra-group property arrangements. Where a Polish subsidiary holds real estate assets that have been reclassified under the 2025 definitions, the arm's-length rent or licence fee for use of those assets may need adjustment. For groups subject to Pillar Two rules, the additional tax cost from reclassification may affect the effective tax rate calculation at entity level. For a detailed treatment of Pillar Two implications for Polish subsidiaries, see our analysis at Pillar Two: practical steps for Polish subsidiaries.

Companies that also face KSeF obligations should be aware that the 2025 real estate tax declarations interact with invoicing requirements under the National e-Invoice System. For the KSeF timeline applicable to companies operating across jurisdictions, see our overview at KSeF deadline timeline 2026–2027 for companies in the United States.

A specific compliance note applies to groups that have recently completed acquisitions in Poland. The merger control thresholds administered by the Office of Competition and Consumer Protection (UOKiK) apply to transactions that may include real estate-heavy targets. Post-merger integration must now include a reclassification review of all acquired assets. For UOKiK thresholds and timelines, see UOKiK merger control thresholds and timeline.

Your specific asset portfolio may contain a combination of buildings, structures, and borderline assets that do not fit neatly into either category. That is where the 2025 framework is most likely to generate disputes. A reclassification that seems straightforward on paper can become contentious when the local tax authority applies a different reading of the annex list. Filing an incorrect declaration – even in good faith – forfeits the reduced surcharge benefit and opens the company to a full audit cycle lasting up to five years.

To receive an expert assessment of your real estate tax exposure under the 2025 definitions, contact info@kordeckipartners.com.

Frequently asked questions

Q: Does the 2025 redefinition affect residential property owners, or only businesses?

A: The new definitions apply to all real estate tax payers, including individuals who own residential property. However, the reclassification risk is concentrated in commercial and industrial assets. Residential buildings that meet the four cumulative conditions – permanent ground attachment, roof, walls, structural self-containment – continue to qualify as buildings. The most significant financial exposure sits with owners of mixed-use sites, industrial installations, and technical infrastructure used in business activity.

Q: How long does a voluntary correction filing take, and what does it cost?

A: Filing an amended real estate tax declaration with the relevant municipality typically takes two to four weeks from the date the corrected asset inventory is finalised. The municipality has 60 days to process the amended declaration and issue a revised decision. Professional fees for a medium-complexity portfolio review – covering asset reclassification, value verification, and declaration preparation – generally range from PLN 15,000 to PLN 60,000 depending on the number of assets and municipalities involved. Acting before an audit is initiated reduces the potential surcharge from 150% to 10% of any underpaid tax.

Q: Is it a misconception that the 2025 changes only affect newly built assets?

A: Yes, that is one of the most common misconceptions we encounter. The 2025 definitions apply to all assets held as of 1 January 2025 – including assets acquired or constructed years earlier. If an asset was classified as a building under the old framework but no longer meets the 2025 building definition, it must be reclassified as a structure in the 2025 annual declaration. There is no grandfathering period. Owners who filed their 2025 declarations using the pre-2025 classification logic should review those declarations immediately, because the five-year limitation period for both refund claims and back-assessments runs from the date the obligation arose.

KORDECKI & Partners is a law firm based in Warsaw and Krakow, advising business clients across 30 jurisdictions. Our team combines expertise in Polish and international law with a practical approach to real estate tax, transfer pricing, and transactional due diligence. We work with Polish entrepreneurs, foreign investors, and in-house legal teams navigating the 2025 definitional changes and their downstream compliance obligations. To discuss your situation, contact info@kordeckipartners.com.

Disclaimer: This publication is provided for informational purposes only and does not constitute legal advice. The information herein should not be relied upon as a substitute for professional legal counsel tailored to your specific circumstances. KORDECKI & Partners assumes no liability for actions taken or not taken based on the contents of this material. For advice regarding your particular situation, please contact info@kordeckipartners.com.