A German industrial group tables a letter of intent for a Warsaw-based distributor. The target looks clean: audited accounts, a tidy National Court Register (KRS) filing history, no visible litigation. Six weeks later, the buyer's counsel uncovers an undisclosed pledge over the main warehouse, three employment disputes pending before the Labour Court, and a transfer-pricing adjustment notice from the National Revenue Administration (Krajowa Administracja Skarbowa, KAS). The deal reprices by EUR 4m. Two of those risks were findable in publicly available registers within a day.
Due diligence on a Polish acquisition target is a structured legal, financial, and regulatory review conducted before signing a share-purchase or asset-purchase agreement. Polish law does not impose a statutory diligence obligation, but courts and arbitral tribunals consistently treat a buyer's failure to investigate as contributory fault that limits post-closing warranty claims. A well-scoped review typically takes four to eight weeks and covers corporate, tax, real estate, employment, and regulatory workstreams.
This guide walks through the five core workstreams, identifies the registers and documents that matter most, flags the mistakes that cost buyers money, and sets out a practical checklist. Three business scenarios – a manufacturing acquirer, an IT company buyer, and a foreign investor entering Poland for the first time – illustrate how scope varies by target type.
What does the corporate and KRS workstream cover?
The corporate workstream is the backbone of any Polish diligence exercise. It establishes who actually owns the target, whether the ownership chain is clean, and whether the management board has authority to sign the transaction documents. The National Court Register (KRS), maintained by the Ministry of Justice, is the starting point. KRS filings are publicly accessible online and disclose the company's articles of association, share capital, board composition, registered pledges, and any insolvency proceedings.
For a spółka z ograniczoną odpowiedzialnością (private limited liability company, sp. z o.o.) – the most common acquisition target in Poland – counsel will verify the share register held by the management board, confirm that all share transfers were executed before a notary, and check whether any shares carry pre-emption rights or are subject to pledges registered in the KRS. A pledge missed at this stage forfeits the buyer's clean-title argument entirely.
Three Polish institutions generate documents that are non-negotiable at this stage:
- National Court Register (KRS) – corporate history, encumbrances, insolvency flags
- Central Register of Beneficial Owners (Centralny Rejestr Beneficjentów Rzeczywistych, CROBR) – ultimate beneficial owner chain
- Land and Mortgage Register (Księga wieczysta, KW) – real property title and mortgages
We secured a full rescission of a share-purchase agreement for a manufacturing client in Mazowieckie (autumn 2025) after KRS review revealed that a prior board resolution approving a key asset disposal had never been passed – rendering the seller's title defective. The deal was restructured rather than abandoned, but only because the defect was caught before signing.
The corporate workstream should be completed within the first ten business days of the diligence period. Any gap in the ownership chain – particularly in targets with private-equity history or family-succession backgrounds – adds at least five additional days for document collection.
How should buyers approach tax and financial diligence in Poland?
Tax diligence in Poland carries asymmetric risk. The general tax limitation period is five years from the end of the calendar year in which the tax obligation arose. A buyer who acquires shares inherits that entire tail. KAS audit powers extend to transfer pricing, VAT settlements, and withholding tax on cross-border payments – all areas where Polish targets have historically underinvested in compliance.
The financial diligence workstream should map the target's tax position across four areas: corporate income tax (CIT), value-added tax (VAT), transfer pricing documentation, and employment-related social contributions (ZUS). Each area requires a separate document request. For CIT, counsel requests the last five years of tax returns, any KAS correspondence, and the target's tax-loss carryforward position. For VAT, the focus is on the ratio of input to output tax, any corrections filed, and the status of any refund claims.
Transfer pricing is the most frequently underestimated risk in mid-market Polish deals. Polish law requires contemporaneous documentation for related-party transactions exceeding certain annual thresholds. Missing or inadequate documentation triggers a 50-percent surcharge on the reassessed income. For a target with EUR 10m in annual intercompany flows, that exposure can be material.
For a foreign investor entering Poland for the first time, the tax workstream also includes a review of any permanent establishment risk created by the target's pre-closing activities in the acquirer's home jurisdiction. We obtained a reversal of a KAS transfer-pricing adjustment exceeding PLN 3m for an IT sector client in Małopolska (spring 2026), after demonstrating that the target's intercompany pricing was consistent with the arm's-length standard documented at the time of the transactions.
To discuss how the tax diligence scope applies to your target, contact info@kordeckipartners.com.
What employment and regulatory risks appear most often in Polish targets?
Employment diligence is the workstream most likely to produce surprises in a Polish acquisition. Polish labour law – governed by the Kodeks pracy (Labour Code) – gives employees strong protections. A share acquisition does not trigger automatic employee consultation obligations, but an asset deal does. Misclassifying the transaction structure here forfeits the buyer's ability to rely on due-process defences in any subsequent Labour Court claim.
The key documents are the target's headcount breakdown, all collective bargaining agreements, any pending Labour Court (Sąd Pracy) proceedings, and the social-insurance contribution history from the Social Insurance Institution (Zakład Ubezpieczeń Społecznych, ZUS). ZUS arrears are a common finding in targets that have grown quickly. Outstanding ZUS liabilities carry statutory interest at 8 percent per annum and are not dischargeable in ordinary insolvency.
Regulatory diligence scope depends entirely on the target's sector. Three sector-specific triggers are worth flagging:
- Financial services – Polish Financial Supervision Authority (KNF) licensing status and any pending supervisory proceedings
- Pharmaceuticals – product registration and Good Manufacturing Practice certificates issued by the Chief Pharmaceutical Inspectorate (Główny Inspektor Farmaceutyczny)
- Real estate development – planning permits, environmental decisions, and construction log entries
For manufacturing targets, environmental compliance is a separate sub-workstream. Integrated environmental permits can take 18 months to transfer. A buyer who closes without confirming transferability risks operating without a valid permit on day one.
Specific due diligence on pending litigation is addressed in detail in our disputes practice overview, which covers how to value contingent claims and assess litigation strategy before signing.
How do the three business scenarios change diligence scope?
Diligence scope is not one-size-fits-all. The three scenarios below show how the same framework produces different priorities depending on the buyer and target profile. Each scenario assumes a target with enterprise value between EUR 5m and EUR 50m – the range where scoping decisions have the greatest cost impact.
Scenario 1 – Manufacturing acquirer buying a Polish supplier. The buyer already knows the industry. The priority workstreams are real property (does the target own or lease its production site?), environmental permits, and ZUS compliance. Corporate and tax diligence can be run in parallel at standard depth. Timeline: six weeks. Estimated legal fee budget: PLN 80,000–150,000 depending on complexity.
Scenario 2 – IT company acquiring a Polish software house. The critical workstream is intellectual property. Counsel must verify that all software was developed by employees or contractors under written IP-assignment agreements. Polish copyright law does not automatically vest employee-created software in the employer without an explicit contractual provision. Missing assignments mean the target does not own the product it is selling. For background on structuring the acquisition vehicle, our sp. z o.o. vs SA decision matrix provides a useful starting framework.
Scenario 3 – Foreign investor acquiring a Polish platform for regional expansion. This buyer needs the broadest scope. In addition to standard workstreams, counsel must review any cross-border contracts that could be affected by change-of-control clauses, confirm that the target's permits are not personal to the current owner, and assess whether the target has created any permanent establishment exposure in the acquirer's home jurisdiction. For French-market investors considering the Polish entry vehicle alongside a French subsidiary, our sp. z o.o. vs SA matrix for French investors covers the structural comparison in detail. Timeline for this scenario: eight to ten weeks.
What are the most common due diligence mistakes in Polish M&A?
Polish M&A practitioners see the same diligence failures repeat across deal cycles. Identifying them in advance is the most cost-effective risk-management tool available to a buyer. Each mistake below has a direct financial consequence – either a lower warranty recovery or a deal that cannot close on the agreed terms.
Mistake 1 – Treating KRS as a complete picture. KRS shows registered encumbrances, but contractual pledges and revenue-based security interests may not be registered. A buyer who relies only on KRS risks acquiring a business with undisclosed security over its key assets. The fix is a direct contractual warranty plus a title search across all relevant registers, including the Financial Collateral Register (Rejestr Zastawów Finansowych).
Mistake 2 – Scoping out the tax tail. Buyers under time pressure sometimes agree to limit tax diligence to three years. The five-year limitation period means years four and five carry full exposure. This is particularly damaging in targets with significant intercompany transactions, where a KAS audit in year four can produce a reassessment that wipes out the deal economics.
Mistake 3 – Ignoring employment classification. Polish courts have reclassified B2B contractor arrangements as employment relationships in a growing number of cases. Each reclassification triggers back-payment of ZUS contributions, income tax, and statutory interest. For a target with 30 contractors, the aggregate exposure can exceed PLN 2m.
What to prepare before the diligence process starts:
- Last five years of financial statements and tax returns
- Full corporate documentation including all board resolutions since incorporation
- List of all pending and threatened litigation, arbitration, and regulatory proceedings
- Employment contracts, contractor agreements, and ZUS payment history
- All material commercial contracts with change-of-control and assignment provisions highlighted
Personal liability of the management board arises when board members sign transaction documents without disclosing known material risks. Under Polish corporate legislation, a board member who withholds information about pending KAS proceedings or undisclosed liabilities may face personal claims that preclude any indemnification from the company itself – an irreversible consequence once the deal closes.
Proceeding to signing without a completed tax workstream forfeits the buyer's strongest post-closing remedy. Once the purchase price is paid and the acquisition closes, the window for price adjustment narrows to whatever warranty-and-indemnity mechanism was negotiated – and Polish courts have consistently held that a buyer who had access to documents but did not review them cannot later claim reliance on a seller's warranty.
Every specific situation carries its own risk profile. A targeted diligence strategy – scoped to the target's sector, size, and ownership history – is the only way to avoid paying for risks that were knowable before signing. To receive an expert assessment of your diligence scope, contact info@kordeckipartners.com.
Frequently asked questions
Q: How long does due diligence typically take for a Polish mid-market target?
A: For a target with enterprise value between EUR 5m and EUR 50m, a standard diligence process takes four to eight weeks from the date the data room is opened. The timeline extends when the target has a complex ownership structure, significant real estate holdings, or a history of related-party transactions. Buyers who compress the timeline below four weeks consistently find that the tax and employment workstreams are incomplete, which limits warranty recovery after closing.
Q: Is it a misconception that share deals are always cleaner than asset deals in Poland?
A: Yes. A share acquisition transfers all historical liabilities of the target entity, including undisclosed tax obligations, environmental liabilities, and employment claims. An asset deal allows the buyer to select which assets and contracts to acquire, leaving historical liabilities with the seller. The choice between structures depends on what is being acquired and what regulatory approvals are required – not on a general assumption that one structure is inherently safer than the other.
Q: What does a due diligence engagement typically cost for a Polish acquisition?
A: Legal fees for a full-scope diligence exercise on a Polish mid-market target range from PLN 60,000 to PLN 250,000, depending on the number of workstreams, the volume of documents, and whether the review includes real estate and regulatory sub-workstreams. Financial diligence by an accounting firm is typically quoted separately. Buyers who attempt to reduce cost by narrowing scope to corporate and financial workstreams only routinely face post-closing claims that exceed the savings by a factor of five or more.
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 and corporate transactions. 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.