A London-based private equity fund signs a term sheet for a mid-sized Polish manufacturer. The target looks clean on paper: profitable, well-staffed, long customer relationships. Three weeks into diligence, the team discovers undisclosed environmental liabilities, a shareholders' agreement that pre-empts the proposed share transfer, and a pending labour inspection that could unwind the entire workforce model. The deal still closes – but at a 20 percent discount and six weeks late.

Due diligence on a Polish acquisition target covers five distinct pillars: corporate title, regulatory compliance, tax exposure, employment structure, and environmental liability. Polish law imposes specific disclosure obligations through the National Court Register (KRS) and sector regulators, but material risks frequently sit outside public filings. A disciplined scope – built around Polish statutory frameworks and adapted to the target's industry – is the only reliable way to price a transaction correctly.

This page sets out the full scope of due diligence for Polish targets. It explains what each workstream covers, where the most common gaps appear, and how cross-border structures add complexity. A self-assessment checklist at the end helps buyers confirm their process is complete before exclusivity expires.

What does corporate due diligence cover for a Polish target?

Corporate diligence on a Polish company starts with the KRS filing and works outward. The KRS – Poland's public company registry, maintained by the district courts – discloses the company's registered capital, board composition, authorised signatories, and any encumbrances on shares. For a spółka z ograniczoną odpowiedzialnością (private limited liability company, sp. z o.o.) or a spółka akcyjna (joint-stock company, S.A.), the KRS extract is the baseline. It is not sufficient.

Title to shares in a sp. z o.o. is evidenced by the shareholders' register, which the company maintains internally. The register may show pledges, usufruct rights, or pre-emption clauses that do not appear in the KRS. Buyers frequently overlook this. A pre-emption right held by a minority shareholder can block a share transfer outright – or trigger an obligation to offer the same terms to that shareholder first. Missing this at heads-of-agreement stage is an expensive mistake.

The corporate review should also examine the company's constitutive documents: its articles of association (umowa spółki for sp. z o.o., statut for S.A.) and any shareholders' agreement. Polish corporate legislation permits wide contractual freedom in these documents. Restrictions on dividend distributions, veto rights over major transactions, and drag-along or tag-along provisions are common. Each affects deal structure and post-closing governance.

We secured confirmation of clean title for a German manufacturing investor acquiring a Silesian sp. z o.o., identifying and resolving a dormant pledge on 30 percent of the shares before signing (winter 2025). The pledge had been granted six years earlier and was invisible in the KRS extract.

One concrete benchmark: the KRS filing fee for a corporate change is PLN 350 – a trivial cost compared to the exposure created by an undisclosed encumbrance. Corporate diligence typically takes two to three weeks for a single-entity Polish target with straightforward ownership.

How do tax and financial risks emerge in Polish M&A diligence?

Tax diligence on a Polish target examines five years of exposure. Polish tax law grants the National Revenue Administration (KAS) the right to reopen assessments within five years of the end of the tax year in which a liability arose. Any acquisition without a full five-year tax review leaves the buyer exposed to pre-closing liabilities that become its problem the moment the shares transfer.

The most common findings in Polish tax diligence are: underpaid VAT on intra-group transactions, transfer pricing documentation gaps, and incorrect CIT treatment of intangible asset amortisation. Transfer pricing is particularly acute for targets that are part of a group. Polish transfer pricing rules require arm's-length documentation for related-party transactions above defined thresholds. Missing or inadequate documentation triggers a KAS audit risk that can materialise years after closing.

The introduction of the Krajowy System e-Faktur (National e-Invoice System, KSeF) adds a new layer. From April 2026, KSeF becomes mandatory for all Polish VAT taxpayers. A target that has not completed its KSeF onboarding by closing will carry an implementation liability – and potential penalties – that the buyer inherits. For more on fiscal criminal exposure linked to tax non-compliance, see our analysis of fiscal criminal defence strategy for board members.

Financial diligence should also examine the target's banking covenants. Polish lenders routinely include change-of-control clauses in facility agreements. A share acquisition that triggers such a clause without prior lender consent can accelerate the entire debt facility – turning a profitable target into an insolvent one within 30 days of closing.

Our tax team recovered a PLN 1.8m VAT adjustment for a Małopolska-based IT services acquirer after identifying a systematic invoicing error in the target's accounts receivable (spring 2026). The adjustment was structured as a price reduction rather than a post-closing claim, protecting the buyer's margin.

What employment and labour risks require diligence in Poland?

Employment diligence in Poland is more complex than buyers from common-law jurisdictions expect. Polish labour law, codified in the Kodeks pracy (Labour Code), provides strong statutory protections for employees. These protections do not disappear on a share acquisition – the buyer steps into the employer's shoes for every existing employment relationship.

The core risk areas are: undisclosed collective agreements, pending State Labour Inspectorate (PIP) proceedings, misclassified contractors, and underfunded holiday accruals. Misclassification of workers as independent contractors (B2B contracts) is endemic in the Polish IT sector. If a court or the Social Insurance Institution (ZUS) reclassifies those relationships as employment, the company becomes liable for unpaid social security contributions – with interest – for up to five years. That liability transfers with the shares.

Collective agreements deserve particular attention. A target employing more than 20 workers may be bound by a company-level collective agreement or a works council arrangement. These instruments can restrict redundancies, mandate consultation periods of up to 30 days before structural changes, and impose severance obligations well above the statutory minimum. Buyers planning post-closing integration should price this carefully.

Ukrainian and other non-EU nationals employed by the target require a separate check. Poland hosts a large Ukrainian workforce. Work permits and temporary residence cards issued under Polish immigration law have defined validity periods. A target with a significant proportion of permit-dependent workers carries a continuity risk if renewals are not tracked. Our Ukrainian Desk routinely identifies permit gaps that neither the target nor its advisers have flagged.

When does regulatory and environmental exposure become a deal-breaker?

Regulatory diligence scope depends on the target's sector. For financial services businesses, the Polish Financial Supervision Authority (KNF) must approve a change of qualifying holding – typically defined as an acquisition of 10 percent or more of shares or voting rights. The KNF review process can take up to 60 working days. Failing to account for this timeline in the transaction schedule is a common and costly mistake.

For manufacturing, energy, and chemical targets, environmental permits issued under Polish environmental law are the critical documents. These permits attach to the facility, not the operator. A share acquisition preserves the permits – but it also preserves all historical liabilities associated with them. Environmental diligence should cover: integrated environmental permits, water law permits, waste management decisions, and any ongoing proceedings before the Chief Inspectorate for Environmental Protection (GIOS).

Historical soil contamination is underreported in Polish targets. Many industrial sites in Silesia, Łódź, and the former Eastern Bloc industrial belt carry contamination from pre-1990 operations. Polish environmental law imposes remediation obligations on the current holder of the land title or the permit. A buyer acquiring shares in a company that owns contaminated land inherits that obligation without a right of recourse against the Polish state.

Sector-specific licences – pharmaceutical, telecoms, transport, gaming – require separate review. Some licences contain change-of-control provisions that require prior regulatory notification or approval. Missing a notification deadline can result in licence suspension. For buyers considering branch versus subsidiary structures as an alternative entry point, our comparison of branch vs. subsidiary in Poland sets out the regulatory implications in detail.

We obtained interim measures protecting assets worth over EUR 4m for a Pomeranian logistics investor after a pre-closing environmental review revealed undisclosed waste storage violations (autumn 2025). The measures preserved the buyer's ability to renegotiate price before the regulatory enforcement process concluded.

How should cross-border buyers structure their Polish diligence process?

Cross-border acquisitions of Polish targets introduce coordination challenges that purely domestic deals avoid. A buyer operating through a holding structure in the Netherlands, Luxembourg, or Cyprus must align Polish diligence findings with the legal frameworks of the holding jurisdiction. A clean KRS does not mean the transaction is clean under Dutch or Cypriot corporate law – the two analyses run in parallel.

Merger control is an early consideration. The Polish Office of Competition and Consumer Protection (UOKiK) has jurisdiction over concentrations where the combined Polish turnover of the parties exceeds PLN 1 billion, or where each of at least two parties has Polish turnover above PLN 10 million. Transactions that fall below EU merger regulation thresholds may still require UOKiK notification. A missed filing can result in fines of up to 10 percent of the acquiring group's annual turnover – and an obligation to unwind the transaction.

Foreign direct investment screening is increasingly relevant. Poland's framework for reviewing acquisitions of strategic assets – covering energy, telecoms, media, and certain manufacturing sectors – can apply to non-EU acquirers. The review period is up to 120 business days. Buyers from outside the EU or EEA should build this into their timeline from the outset.

Data protection diligence has become a standalone workstream. A Polish target that processes personal data of EU residents is subject to the General Data Protection Regulation (GDPR) and supervised by the Polish Personal Data Protection Office (UODO). Diligence should confirm that data processing agreements, privacy notices, and data transfer mechanisms are in place. A UODO enforcement action pending at closing creates both a financial liability and a reputational risk that may be difficult to quantify.

For buyers with prior experience in the Polish market – or those considering their first Polish acquisition – our guide on red flags in Polish M&A for UK buyers addresses the most frequently missed issues in cross-border transactions.

What does a complete Polish due diligence checklist include?

A complete diligence process for a Polish acquisition target should cover all five pillars described above. The checklist below is a minimum standard for a mid-market share acquisition. Asset deals require additional items, particularly around title transfer, permit novation, and VAT treatment of the transferred assets.

  • Corporate: KRS extract (current), shareholders' register, articles of association, any shareholders' agreement, board resolutions authorising the transaction, and confirmation of no undisclosed share encumbrances
  • Tax: five-year CIT and VAT review, transfer pricing documentation, KSeF readiness status, banking covenants with change-of-control provisions, and any pending KAS audit or tax court proceedings
  • Employment: employment contracts for key personnel, B2B contractor analysis, ZUS compliance for the past five years, collective agreements, PIP inspection history, and work permit status for non-EU nationals
  • Regulatory and environmental: sector licences with change-of-control review, integrated environmental permits, GIOS enforcement history, UOKiK merger control threshold assessment, and FDI screening applicability
  • Data and IP: UODO compliance status, data processing agreements, IP ownership confirmations, and any pending IP disputes

Timeline for a standard mid-market Polish diligence process: four to six weeks for a single-entity target with full data room access. Multi-entity group structures typically require eight to ten weeks. These timelines assume a complete and well-organised data room. Incomplete disclosure is the single most common cause of diligence overruns – and of post-closing disputes.

Decision matrix: a target with straightforward ownership, no regulatory licence, and clean tax filings can proceed on a four-week timeline with a two-person legal team. A target in a regulated sector, with group transfer pricing exposure and a non-EU workforce, requires a six-person multidisciplinary team and a minimum of eight weeks. Attempting to compress the timeline in the second scenario forfeits the buyer's ability to renegotiate or walk away on informed grounds.

Frequently asked questions

Q: Can a buyer rely on the seller's warranties instead of conducting full diligence?

A: Warranties are a remedy after the fact – they do not prevent the problem from arising. Polish law permits warranty claims under the Civil Code, but litigation to recover a warranty payment typically takes two to three years in the Polish court system. A buyer who skips diligence and relies on warranties forfeits the ability to price the risk correctly at signing. Warranty and indemnity insurance, increasingly available in the Polish market, does not substitute for diligence either – insurers require a clean diligence report as a condition of coverage.

Q: How long does a standard Polish due diligence process take, and what does it cost?

A: For a single-entity sp. z o.o. with full data room access, four to six weeks is a realistic timeline. Legal fees for a mid-market transaction (enterprise value EUR 5m to EUR 30m) typically range from EUR 20,000 to EUR 60,000 depending on scope and complexity. Regulated sector targets, group structures, or significant environmental exposure add to both timeline and cost. Buyers who try to reduce diligence fees on a EUR 20m transaction routinely absorb post-closing losses that dwarf the saving.

Q: Does Polish law require the seller to disclose known defects in the target company?

A: Polish Civil Code provisions on defects in the subject matter of a contract apply to share sales, but their practical scope is narrower than buyers often assume. The seller's disclosure obligation under statute covers known physical and legal defects – it does not impose a general duty to volunteer all material information. In practice, the disclosure framework is governed by the representations and warranties section of the sale and purchase agreement. A well-drafted SPA, combined with a comprehensive data room process, is the only reliable protection. Statutory remedies for concealed defects carry a two-year limitation period from discovery.

The specific situation of your company may differ materially from the scenarios described above. Gaps in diligence scope – particularly in tax, environmental, or employment workstreams – can create irreversible post-closing liabilities that no warranty claim will fully recover. Acting before exclusivity expires is the only way to preserve full negotiating leverage.

If your company is acquiring a Polish target and requires a structured diligence process – from KRS review through to regulatory clearance – contact our Warsaw team to discuss scope, timeline, and fees: info@kordeckipartners.com.

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 transactions, corporate restructuring, and cross-border acquisitions. 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.