A Warsaw-based private equity fund signs a letter of intent for a Polish manufacturing target. Three weeks into due diligence, the data room reveals undisclosed tax arrears, a disputed land title, and a management board that has quietly changed twice in eighteen months. Each item, taken alone, might be explainable. Together, they signal something deeper. Knowing which warning signs matter – and how to read them under Polish law – is what separates a successful acquisition from a costly mistake.

Polish M&A transactions carry jurisdiction-specific risks that standard international checklists miss. The National Court Register (Krajowy Rejestr Sądowy, KRS) records corporate history, but gaps between filings and reality are common. Under Polish corporate legislation, undisclosed liabilities, defective share transfers, and missing regulatory consents can render a transaction voidable or expose the buyer to successor liability. Identifying these red flags before signing is the only reliable protection.

This guide walks through the four most consequential categories of red flags in Polish M&A transactions. It covers the KRS and ownership structure, financial and tax exposures, real estate and regulatory consents, and the operational signals that experienced advisers watch during due diligence Poland assignments. Each section includes a concrete figure, a practical scenario, and a checklist of items to verify before closing.

What does the KRS reveal – and what does it hide?

The KRS is the starting point for any due diligence Poland exercise. It records share capital, shareholders, board composition, and registered pledges. However, the register operates on a disclosure lag. A board change filed today may not appear in the publicly searchable database for several days. More seriously, a pledge over shares registered with the KRS may have been released without a corresponding update. Buyers who rely on a single KRS printout at signing take a real risk.

Three structural red flags appear repeatedly in Polish transactions. First, a spółka z ograniczoną odpowiedzialnością (limited liability company, sp. z o.o.) with a share capital of only PLN 5,000 – the statutory minimum – in a sector where creditors would expect far more. Second, frequent changes to the management board (zarząd) without documented shareholder resolutions. Third, a discrepancy between the KRS-registered address and the company's actual place of business, which can indicate nominee arrangements or undisclosed group structures.

The shareholder register (księga udziałów) is maintained by the company itself, not by the KRS. This creates a second layer of risk. We have seen transactions where the KRS showed one ownership structure while the internal register reflected a different one – the result of an unregistered share transfer. Under Polish corporate legislation, a share transfer in a sp. z o.o. requires a written agreement with notarially certified signatures. Any transfer without that form is void. Buyers should always request the original shareholder register, not a copy, and cross-check it against all notarial deeds.

The Polish Financial Supervision Authority (Komisja Nadzoru Finansowego, KNF) maintains its own registers for regulated entities. If the target holds a licence – payment institution, insurance intermediary, or investment firm – the KNF register must be checked independently of the KRS. A licence that appears valid in the KRS may already be suspended or under investigation at the KNF level.

Which financial and tax exposures are hardest to spot?

Tax liability is the single most common source of post-closing disputes in Polish transactions. The Polish tax authority (Krajowa Administracja Skarbowa, KAS) has a five-year limitation period for most tax assessments. That means a buyer acquiring shares in a sp. z o.o. inherits up to five years of potential VAT, CIT, and transfer pricing exposure. A clean tax return for the last filed year tells you almost nothing about what KAS may assess in the next 36 months.

The most dangerous exposures are rarely visible on the face of the accounts. They include: VAT carousel involvement (even as an unknowing participant), transfer pricing adjustments across intra-group transactions, and undeclared payroll obligations for workers engaged as civil-law contractors. Polish labour law presumes an employment relationship when certain conditions are met. If KAS or the Social Insurance Institution (Zakład Ubezpieczeń Społecznych, ZUS) reclassifies contractors as employees, the employer faces back contributions plus interest – sometimes exceeding PLN 500,000 for a mid-sized workforce.

We secured a reversal of a tax surcharge exceeding PLN 2m for a manufacturing client in the Mazowieckie region (autumn 2025). The underlying issue was a VAT chain that the target had inherited from a previous owner. The buyer had not requested a full five-year VAT audit trail during due diligence. That omission cost eighteen months of post-closing litigation before the administrative court (Wojewódzki Sąd Administracyjny, WSA) confirmed our position.

A practical financial checklist for buyers should include:

  • Five years of tax returns and all KAS correspondence
  • ZUS confirmation of no outstanding social insurance arrears
  • Full list of related-party transactions and transfer pricing documentation
  • Any ongoing or threatened tax audits (kontrole podatkowe)

To receive an expert assessment of your target's tax exposure before signing, contact info@kordeckipartners.com.

How do real estate and regulatory consents become deal-breakers?

Real estate risk in Polish M&A is underestimated. Many Polish companies own or use land and buildings that carry title defects traceable to post-war nationalisation, restitution claims, or informal use arrangements. A perpetual usufruct (użytkowanie wieczyste) title – the most common form of commercial land tenure in Poland – must be verified in the Land and Mortgage Register (Księga Wieczysta). Buyers should check not only the current entry but the full history of entries, including any prior mortgage releases or easements.

Regulatory consents create a separate category of risk. Polish law requires prior approval from the Office of Competition and Consumer Protection (Urząd Ochrony Konkurencji i Konsumentów, UOKiK) for transactions above the domestic turnover threshold. The filing deadline is before closing. Failure to notify UOKiK can result in a fine of up to 10% of the acquiring group's annual turnover – an irreversible financial consequence that no representations and warranties policy will cover.

Three consent-related red flags deserve attention. Environmental permits tied to the target's industrial licence may not transfer automatically on a share sale. A concession for natural resource extraction is personal to the holder and may require a new application. Real estate used under a lease from a municipality (gmina) may contain a clause prohibiting indirect change of control – which a share acquisition triggers even without a formal property transfer.

For buyers in the M&A Poland market who are also setting up a new Polish entity alongside the acquisition – common in carve-out structures – the interaction between the new company registration process and the target's existing regulatory framework can generate unexpected delays. Understanding how to set up company Poland structures efficiently, as discussed in our analysis at sp. z o.o. vs SA decision matrix for United Kingdom investors, is relevant here.

What operational red flags signal deeper structural problems?

Operational due diligence often surfaces the red flags that financial analysis misses. A target with consistently high revenue but shrinking working capital is a classic warning sign. In Polish transactions, the explanation is often aggressive use of factoring facilities – the company has sold its receivables to a third party and the balance sheet no longer reflects true cash generation. Buyers should always ask for the net working capital figure excluding factored receivables.

Key-person dependency is another structural risk. Polish family-owned businesses – which represent a large share of M&A Poland deal flow – frequently rely on one individual for supplier relationships, regulatory contacts, or technical know-how. If that person is not retained post-closing, the business may deteriorate within 90 days. A well-drafted earn-out or retention arrangement can manage this risk, but it must be structured before signing, not added as an afterthought.

Our team obtained interim measures protecting assets worth over EUR 5m for a German investor's subsidiary in Lower Silesia (spring 2026). The underlying issue was an undisclosed litigation claim that the seller had omitted from the disclosure letter. The claim had been filed with the district court (sąd rejonowy) six months before signing. A proper litigation search – which Polish law firms can conduct through court registry databases – would have identified it within 48 hours.

Buyers acquiring targets with cross-border exposure should review our companion analysis on red flags in Polish M&A for Luxembourg buyers and our ESG compliance guidance at ESRS implementation steps for Polish reporting entities, which is increasingly relevant for targets subject to sustainability reporting obligations.

What to prepare before entering due diligence:

  • Current KRS printout plus full filing history going back five years
  • Original shareholder register and all notarial deeds for share transfers
  • Five years of tax returns and any KAS audit correspondence
  • Land and Mortgage Register extracts for all owned or mortgaged real estate
  • Full list of pending or threatened litigation, arbitration, and regulatory proceedings

Every item on this list has been the source of a material dispute in a Polish transaction we have advised on. Missing even one creates exposure that representations and warranties insurance may not cover.

The specific facts of your transaction determine which risks are material and which are manageable. Leaving that assessment to post-signing is an irreversible mistake.

To discuss how these red flags apply to your target, email info@kordeckipartners.com. We will identify the three highest-priority risks within your due diligence scope and propose a structured review timeline.

Frequently asked questions

Q: How long does a standard due diligence process take for a Polish sp. z o.o. acquisition?

A: A focused due diligence review for a mid-market sp. z o.o. typically takes between three and six weeks, depending on the size of the data room and the complexity of the target's regulatory profile. Tax and real estate workstreams tend to drive the timeline. Buyers who request a five-year KAS audit trail and full Land and Mortgage Register history at the outset reduce delays significantly. Budget for at least four weeks if the target holds any licensed activity or owns real property.

Q: Does a share acquisition in Poland automatically transfer all liabilities of the target company?

A: Yes – this is a common misconception among first-time buyers in Poland. A share acquisition does not create a clean break from the target's historical liabilities. The buyer acquires the legal entity as it stands, including undisclosed tax arrears, employment claims, and pending litigation. This is the opposite of an asset deal, where the buyer can select which liabilities to assume. Representations and warranties insurance can provide some protection, but it does not substitute for thorough due diligence Poland procedures before signing.

Q: Is UOKiK clearance always required for a Polish M&A transaction?

A: Not always. The obligation to notify the Office of Competition and Consumer Protection (UOKiK) arises when the combined worldwide turnover of the transaction parties exceeds EUR 1 billion, or when their combined Polish turnover exceeds EUR 50 million and at least two parties each exceed EUR 10 million in Poland. Transactions below these thresholds do not require domestic clearance, though European Commission jurisdiction may still apply. A law firm Warsaw-based advisers use will confirm the applicable threshold at the outset of any M&A Poland mandate.

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 M&A due diligence, corporate structuring, and transaction risk management. We work with Polish entrepreneurs, foreign investors, and in-house legal teams. 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.