A Luxembourg private equity fund signs a term sheet for a Warsaw-based logistics operator. The target looks clean on paper: audited financials, a tidy National Court Register (KRS) extract, and three years of steady EBITDA growth. Six weeks later, the fund's advisers uncover an undisclosed pledge over the company's main warehouse, a labour dispute involving 40 drivers, and a transfer-pricing adjustment pending before the National Revenue Administration (KAS). The deal does not collapse – but the price drops by 12% and closing is delayed by two months.

Due diligence for a Polish acquisition target is a structured investigation across at least five workstreams – corporate, legal, tax, financial, and regulatory – conducted before signing a share purchase agreement (SPA). Polish law imposes no statutory minimum scope, but the Kodeks spółek handlowych (Commercial Companies Code, KSH) and general civil-law principles place the risk of undisclosed liabilities squarely on the buyer unless the SPA contains explicit warranties. A thorough diligence process typically runs four to eight weeks and costs between EUR 30,000 and EUR 150,000 in professional fees, depending on target complexity.

This guide walks through each workstream in sequence, identifies the documents Polish targets are required to maintain, flags the errors buyers most commonly make, and closes with a practical checklist. Three business scenarios – a manufacturing company in Silesia, a Warsaw IT firm, and a foreign investor buying into a Polish joint venture – illustrate how scope shifts with sector and structure.

What does the corporate and legal workstream cover?

The corporate workstream anchors every other diligence track. It answers a single question: does the seller actually own what it is selling, and is the company validly constituted? The starting point is the KRS extract, which records the company's registered address, share capital, management board, supervisory board (if any), and encumbrances on shares. A clean KRS entry is necessary but not sufficient – the register is declaratory, not constitutive, for many facts.

Beyond the KRS, advisers review the company's articles of association (umowa spółki) for consent requirements, pre-emption rights, and any drag-along or tag-along provisions. For a spółka z ograniczoną odpowiedzialnością (limited liability company, sp. z o.o.), the share ledger (księga udziałów) must be inspected in person – it is not publicly available. Discrepancies between the share ledger and the KRS are a red flag that can indicate undisclosed transfers or disputed ownership. We identified exactly this issue for a Mazowieckie region manufacturing client in autumn 2024, allowing renegotiation before the SPA was signed.

The legal workstream then maps all material contracts: supplier agreements, customer contracts, lease arrangements, and any exclusivity or non-compete clauses. Change-of-control provisions deserve particular attention. Many Polish commercial leases and distribution agreements contain automatic termination or renegotiation rights triggered by a change of majority shareholder. Missing one such clause can destroy the operational rationale for the deal.

  • KRS extract and full corporate history (all amendments)
  • Articles of association and shareholders' resolutions for the past three years
  • Share ledger and any pledge agreements (zastaw rejestrowy) over shares
  • Material contracts with change-of-control analysis
  • Ongoing and threatened litigation before Polish courts

Litigation exposure deserves a separate sub-workstream. The Polish court system – administered through district courts (sądy rejonowe) and regional courts (sądy okręgowe) – does not maintain a publicly searchable database of pending claims. Buyers must rely on management representations, reviewed against court correspondence files and external counsel letters. A target with undisclosed claims exceeding PLN 500,000 in aggregate should trigger an escrow or price-adjustment mechanism in the SPA.

How should buyers approach the tax workstream?

Tax diligence is the workstream most likely to move the price. Polish tax law has a five-year statute of limitations for most corporate income tax (podatek dochodowy od osób prawnych, CIT) assessments. That means buyers inherit exposure to the five most recent fiscal years. The KAS can open an audit at any point within that window, and personal liability of board members for tax arrears under Polish tax ordinance rules is a real – and often overlooked – risk. For background on that exposure, see our analysis of fiscal criminal defence and KKS strategy for board members.

The core tax documents to request are CIT and VAT returns for the past five years, any KAS audit protocols, advance pricing agreements (APAs), and transfer-pricing documentation (dokumentacja cen transferowych). Transfer pricing is a high-priority area in Poland: the KAS has significantly increased the number of TP audits since 2022, and targets with related-party transactions above EUR 2m per year face heightened scrutiny. Missing or inadequate TP documentation is an immediate red flag.

Value added tax (VAT) deserves its own review. Carousel fraud exposure, input VAT deduction disputes, and the status of the target on the "white list" of VAT payers (biała lista podatników VAT) all carry successor liability risk. A buyer acquiring shares rather than assets takes on the target's entire VAT history. One practical check: verify that the target's bank account numbers match those on the white list for each year under review.

For foreign investors acquiring a Polish sp. z o.o., withholding tax (WHT) on dividends and interest payments to related parties is another focus area. Polish WHT rules were tightened in 2022, and the "pay and refund" mechanism applies to payments above PLN 2m per year to a single recipient. Any WHT refund claims pending with the KAS should be quantified and treated as a contingent asset – not a certainty.

What are the most common due diligence mistakes in Polish M&A?

The single most common mistake is scope compression under time pressure. Buyers agree to a four-week exclusivity window and then cut the regulatory and employment workstreams to meet the deadline. Those are precisely the areas where Polish law diverges most sharply from Western European norms, and where undisclosed liabilities are hardest to quantify after closing.

Employment diligence is underweighted in almost every deal we review. Polish labour law – governed by the Kodeks pracy (Labour Code) – treats employees as automatic transferees in an asset deal and imposes collective information-and-consultation obligations that can delay closing by 30 days. In a share deal, the employment relationship continues unchanged, but undisclosed agreements with trade unions (związki zawodowe), pending claims before labour courts (sądy pracy), and off-book benefit arrangements can generate material post-closing costs.

A second common error is ignoring real estate title chains. Polish land and mortgage registers (księgi wieczyste) are publicly accessible online, but the register may lag behind actual transactions by several months. A target that owns or leases industrial property should have its title chain verified against the register, the perpetual usufruct agreement (prawo użytkowania wieczystego) where applicable, and any zoning plan (miejscowy plan zagospodarowania przestrzennego) affecting future use. We secured interim measures protecting assets worth over EUR 4m for a foreign investor's subsidiary in Lower Silesia (spring 2025) precisely because a title defect was caught during diligence rather than after closing.

For buyers considering how Polish structures compare before committing to a share acquisition, our guide on branch versus subsidiary in Poland sets out the structural trade-offs in detail.

How do scope and timeline vary across three business scenarios?

Diligence scope is not one-size-fits-all. The right workstreams, depth, and timeline depend on the target's sector, size, and ownership structure. Three scenarios illustrate the range.

Scenario 1 – Silesian manufacturing company. A German strategic buyer acquires a mid-size steel-processing plant. Priority workstreams are environmental permits (issued by the Regional Director for Environmental Protection, Regionalny Dyrektor Ochrony Środowiska), real estate title, and collective labour agreements. Environmental remediation liability is open-ended under Polish environmental law and does not extinguish on a share transfer. Timeline: six to eight weeks. Budget: EUR 80,000–120,000.

Scenario 2 – Warsaw IT company. A private equity fund acquires a software house with 80 employees and SaaS contracts. Priority workstreams are IP ownership (are the developers employees or contractors?), data-protection compliance under the General Data Protection Regulation (GDPR) as implemented in Poland, and customer contract portability. Non-compete and IP assignment clauses in employment contracts require line-by-line review. Timeline: four to five weeks. Budget: EUR 40,000–70,000.

Scenario 3 – Foreign investor acquiring a Polish joint venture stake. A Dutch holding company buys out its Polish partner's 50% stake in a sp. z o.o. The JV agreement, deadlock mechanisms, and any drag-along rights must be reviewed alongside the standard corporate workstream. Minority protections embedded in the articles of association may survive the transaction and bind the new majority shareholder. For specific red flags relevant to cross-border buyers, see our article on red flags in Polish M&A for Luxembourg buyers. Timeline: three to four weeks for the incremental scope. Budget: EUR 30,000–50,000.

Across all three scenarios, the decision matrix is the same: map the target's risk profile first, then allocate diligence resources to the highest-exposure workstreams rather than applying a uniform checklist.

Each scenario also illustrates a structural choice: asset deal versus share deal. An asset deal allows the buyer to cherry-pick liabilities but triggers transfer taxes and requires third-party consents on contracts. A share deal is cleaner operationally but transfers the entire liability history. The right answer depends on tax structuring, sector regulation, and the seller's willingness to provide warranties.

For businesses that need to set up company Poland operations from scratch rather than acquire, the structural analysis differs – but the KRS registration requirements and sp. z o.o. governance rules apply in both contexts.

What should buyers prepare before launching diligence?

Preparation on the buyer side is as important as the target's data room. Buyers who arrive without a clear scope letter, a defined workstream allocation, and an agreed escalation protocol waste the first week of exclusivity on process rather than substance. In a competitive auction, that week can cost the deal.

The checklist below reflects the minimum preparation standard our team applies before opening a Polish target's data room.

  • Agreed diligence scope letter signed by both parties, specifying workstreams and document categories
  • Virtual data room (VDR) access granted with a complete index – missing documents flagged on day one, not day 20
  • Dedicated project manager on the buy side with authority to escalate issues directly to the deal team
  • SPA term sheet reviewed for warranty and indemnity (W&I) insurance eligibility before diligence opens
  • KRS, white list, and land register searches completed independently before the data room opens

W&I insurance has become standard in Polish mid-market M&A. Insurers typically require a clean diligence report with no unresolved material issues. Any issue disclosed in the report but not resolved before closing will be excluded from cover. That creates a direct financial incentive for both parties to surface and resolve issues during diligence rather than after signing.

A specific concern for foreign buyers: Polish law requires that certain regulatory approvals – from the Office of Competition and Consumer Protection (Urząd Ochrony Konkurencji i Konsumentów, UOKiK) or the Polish Financial Supervision Authority (KNF) depending on sector – be obtained before or at closing. Failing to identify a mandatory filing obligation during diligence can delay closing by three to six months or, in the worst case, render the transaction void.

To discuss how diligence scope applies to your specific acquisition target in Poland, contact info@kordeckipartners.com.

Frequently asked questions

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

A: For a mid-size sp. z o.o. with revenues between EUR 5m and EUR 50m, a full five-workstream diligence takes four to eight weeks from data room access. Compressed timelines of two to three weeks are possible for asset-light businesses but carry the risk of missing regulatory or employment issues. The timeline also depends on how quickly the target produces documents – incomplete data rooms are the most common cause of delay in Polish M&A transactions.

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

A: Yes. In a share deal, the buyer acquires the legal entity with its entire history, including any unassessed tax liabilities for the five-year limitation period. This is a common misconception among first-time buyers in Poland who assume that clean audited accounts eliminate tax risk. Audited financials reflect accounting standards, not tax law compliance. A separate tax diligence workstream covering CIT, VAT, transfer pricing, and withholding tax is non-negotiable for any share acquisition above EUR 1m in value.

Q: What is the most frequently overlooked diligence item in Polish acquisitions?

A: Environmental liability and real estate title chains are most often underweighted, particularly by buyers focused on financial metrics. Polish environmental law imposes remediation obligations on the current owner of contaminated land regardless of who caused the contamination. In manufacturing or logistics deals, a Phase I environmental assessment and a review of all permits issued by regional environmental authorities should be standard, not optional. Buyers who skip this step have faced remediation costs exceeding PLN 5m post-closing.

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 execution. We work with Polish entrepreneurs, foreign investors, and in-house legal teams navigating acquisitions in the Polish market. 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.