A Western European acquirer enters a letter of intent for a mid-sized Polish technology business. The target looks clean on paper. Six weeks into due diligence, counsel identifies undisclosed pledge entries in the Krajowy Rejestr Sądowy (National Court Register of Poland). Two unresolved labour disputes. Additionally, a corporate reorganisation that left a minority shareholder with unexercised pre-emption rights. The deal still closes – but only after significant price adjustments and an extended escrow arrangement. Situations like this are not unusual. They arise precisely because Polish corporate and commercial legislation contains procedural layers that are easy to miss for teams without direct local experience.
M&A due diligence in Poland covers legal, financial, and regulatory review of the target entity before execution of a umowa sprzedaży udziałów (share purchase agreement, or SPA). The process typically runs over four to eight weeks for a mid-market transaction and culminates in a due diligence report that informs representations and warranties, indemnities, and closing conditions in the SPA. Polish corporate legislation, commercial legislation, tax legislation, employment legislation, and – where applicable – sector-specific regulatory rules all feed into the scope of review.
This guide walks through each stage of the due diligence process in Poland: the preparatory steps, the documentary checklist by workstream. The most consequential errors foreign acquirers make. Additionally, a self-assessment decision framework to help you calibrate depth and cost to your specific transaction.
Why Polish M&A due diligence demands specialist attention
Poland operates a civil law system rooted in continental European tradition. Its corporate legislation distinguishes between two primary private company forms: the spółka z ograniczoną odpowiedzialnością (limited liability company, or sp. z o.o.) and the spółka akcyjna (joint-stock company, or S.A.). Most mid-market M&A targets are structured as sp. z o.o. entities. Each form carries distinct rules on share transfer, shareholder rights, and governance – and the distinctions directly affect how due diligence is scoped.
The National Court Register maintains publicly accessible filings on company structure, pledges, and management representation rights. However, relying on register extracts alone is insufficient. The register reflects historical filings, not current commercial reality. Practitioners in Poland consistently note that discrepancies between registered data and actual company practice are a recurring source of deal risk. particularly for targets that have undergone restructuring. Shareholder changes. Alternatively, debt financing in the preceding three to five years.
Polish employment legislation adds a further layer of complexity. Poland has a large and well-organised trade union environment. Targets with collective bargaining agreements in place trigger specific information and consultation requirements. Missing these requirements can expose the acquirer to post-closing claims under employment legislation. The Państwowa Inspekcja Pracy (State Labour Inspectorate) has broad enforcement powers, and a history of inspections or unresolved notices must be verified directly from target documentation rather than inferred from register data alone.
Tax legislation in Poland has been subject to frequent amendment. Anti-avoidance provisions, transfer pricing documentation requirements, and VAT compliance have all tightened considerably in recent years. A target that was fully compliant three years ago may face retroactive exposure under rules that were not yet in force at the time of the transactions under review. For foreign acquirers, the interplay between Polish tax legislation and their home jurisdiction's rules on controlled foreign corporations adds a further dimension that must be mapped before signing.
For international buyers considering acquisitions across both Polish and other Central European markets, understanding corporate law requirements in Poland is essential groundwork before approaching transaction documentation.
Step-by-step due diligence process and timeline
Due diligence in a Polish M&A transaction follows a structured sequence. Each stage builds on the previous one. Compressing or skipping stages is a common source of post-closing disputes.
Stage 1 – Scope definition and data room preparation (weeks 1–2). Before the data room opens, the acquirer's counsel prepares a document request list structured by workstream: corporate, commercial, employment, tax, regulatory, IP, and litigation. The seller's counsel reviews the list and identifies documents subject to confidentiality restrictions, regulatory approvals for disclosure, or privilege. A well-structured data room at this stage significantly shortens the overall timeline. Poorly organised data rooms – a common feature of owner-managed businesses – can add two to three weeks to the process.
Stage 2 – Corporate and title review (weeks 2–3). This workstream examines the chain of ownership of shares, the target's constitutional documents, and the history of shareholder changes. Counsel verifies that each prior transfer complied with pre-emption rights, board approval requirements, and notarisation obligations under Polish corporate legislation. Share transfers in a sp. z o.o. require notarially certified signatures. Any transfer executed without this formality is void. Counsel checks the share register maintained by the company alongside the National Court Register entries.
Stage 3 – Commercial contracts review (weeks 2–4). The acquirer needs to understand which material contracts contain change-of-control clauses. Under Polish commercial legislation, many standard supply, distribution, and financing agreements include provisions that allow the counterparty to terminate or renegotiate on a change of ownership. Identifying these clauses early allows the parties to build a consent solicitation programme into the transaction timetable. Failing to do so is one of the most consequential errors in Polish deal practice. A significant share of post-closing disputes arises from undisclosed or overlooked change-of-control triggers.
Stage 4 – Employment and labour law review (weeks 2–4). Poland's employment legislation provides strong protections for employees. The review covers all employment contracts, non-compete arrangements, collective agreements, pending or threatened labour claims, and any ongoing State Labour Inspectorate proceedings. If the target employs a material portion of its workforce under civil law contracts rather than employment contracts. a common cost-reduction practice. there is a risk that authorities could reclassify those arrangements as employment relationships. Reclassification triggers significant back-payment obligations for social security contributions and income tax.
Stage 5 – Tax review (weeks 3–5). Tax due diligence in Poland covers corporate income tax, VAT, transfer pricing, and payroll tax compliance. Counsel reviews tax returns, audit history, correspondence with the Krajowa Administracja Skarbowa (National Revenue Administration), and any advance pricing agreements or binding tax rulings in place. The look-back period is typically five years, aligned with the general limitation period under Polish tax legislation. Significant VAT exposure from historic supply chain arrangements is a recurring finding in targets that expanded rapidly during growth phases.
Stage 6 – Litigation and regulatory review (weeks 3–5). This workstream covers pending civil, administrative. Additionally. Criminal proceedings. regulatory investigations. and any sector-specific licences or permits that are personal to the target entity and may not transfer automatically on a share sale. For regulated sectors – financial services, pharmaceuticals, energy, telecommunications – the regulatory dimension can be the most time-consuming part of the entire process.
Stage 7 – Due diligence report and SPA negotiation (weeks 5–8). Counsel consolidates findings into a due diligence report structured by risk rating: material, moderate, and minor. The report informs the representations and warranties in the SPA, the indemnity schedule, and any price adjustment or escrow mechanism. Closing conditions are drafted to address material findings that cannot be resolved before signing. The SPA is negotiated in parallel with the final stages of due diligence. In Poland, the SPA for a sp. z o.o. acquisition must be executed before a notary or with notarially certified signatures.
For a comparative view of how this process unfolds in another EU jurisdiction, our guide to M&A due diligence in Portugal sets out the key procedural differences under Portuguese corporate legislation.
To receive an expert assessment of your proposed acquisition in Poland, contact us at info@ferrazwhitmore.com.
Documentary checklist: what to request by workstream
The following checklist covers the core document categories for a standard legal due diligence review of a Polish target. It is not exhaustive – sector-specific targets will require additional workstreams – but it addresses the areas where foreign acquirers most frequently encounter unexpected findings.
Corporate and ownership:
- Current and historical excerpts from the National Court Register
- Articles of association and all amendments
- Share register and evidence of all prior transfers with notarisation confirmation
- Shareholders' resolutions and management board minutes for the past five years
- Any shareholder agreements, drag-along and tag-along arrangements, or side letters
Commercial contracts:
- All material customer and supplier agreements, with identification of change-of-control clauses
- Distribution, agency, and franchise agreements
- Financing agreements, security documentation, and any pledge entries in the pledge register
- Lease agreements for material real property
- IP licences, software agreements, and data processing contracts
Employment and HR:
- All employment contracts for senior management and key personnel
- Collective bargaining agreements and works council agreements
- Civil law contracts (mandate and specific-task contracts) for the full workforce
- Non-compete and confidentiality agreements
- Records of State Labour Inspectorate visits and any outstanding notices
Tax:
- Corporate income tax returns for the past five years
- VAT returns and any VAT audit correspondence
- Transfer pricing documentation and intercompany agreements
- Binding tax rulings or advance pricing agreements in force
- Social security contribution records and any ZUS (Social Insurance Institution) audits
Litigation and regulatory:
- Schedule of all current and threatened civil, administrative, and criminal proceedings
- Sector licences and regulatory permits, with expiry dates and transferability analysis
- Environmental permits and any outstanding remediation obligations
- Data protection registration and GDPR compliance documentation
A non-obvious risk that surfaces repeatedly in Polish transactions involves the pledge register (rejestr zastawów). This register – separate from the National Court Register – records security interests over moveable assets and receivables. Foreign counsel unfamiliar with Polish secured transactions law sometimes overlooks this register entirely. An undetected registered pledge over key assets or receivables can materially affect the target's free transferability and its ability to operate post-closing.
Real property title is another area requiring careful attention. Polish real estate legislation maintains a land and mortgage register (księga wieczysta) that is publicly searchable. Any encumbrance, mortgage, or easement affecting property used by the target must be verified directly in this register. Relying on seller warranties alone – without independent register verification – leaves the acquirer exposed to encumbrances that bind successors in title regardless of their knowledge at the time of acquisition.
Common errors by foreign acquirers and their consequences
Foreign buyers approaching Polish transactions for the first time tend to make a predictable set of errors. Understanding them in advance reduces both cost and post-closing risk.
Underestimating the civil law documentation formality. In common law jurisdictions, share transfers are typically effected by a short instrument executed under hand. In Poland, corporate legislation requires notarially certified signatures for sp. z o.o. share transfers. Acquirers who send unsigned or improperly executed transfer documentation cause delays and, in some cases, void transfers that must be re-executed with additional costs. Budget for notarial fees – typically in the range of thousands of zloty depending on deal size – and for scheduling in advance, as notary availability in complex transactions is not unlimited.
Treating the National Court Register as a complete picture. The register is a starting point, not a complete record of the target's legal position. Many obligations – pledges, contractual restrictions, informal shareholder arrangements – exist entirely outside the register. A buyer who relies on a clean register extract without conducting full documentary review regularly encounters material undisclosed liabilities within the first year post-closing.
Overlooking pre-emption rights among existing shareholders. Polish corporate legislation gives existing shareholders pre-emption rights over new share issuances. Shareholder agreements and articles of association frequently extend similar rights to share transfers between existing shareholders and third parties. If these rights were not properly waived in prior transactions, the current transaction may be challenged by a shareholder asserting that their pre-emption right was never extinguished. This is one of the most frequently litigated issues in Polish post-closing disputes.
Misreading the employment headcount. Polish businesses frequently use a blend of employment contracts and civil law contracts to manage workforce costs. From a foreign acquirer's perspective, the total headcount looks lower than it actually is in substance. Post-acquisition, authorities may audit the classification of civil law contractors. If reclassification occurs, the acquirer bears the back-payment obligation. Representation and warranty insurance does not always cover reclassification risk. The SPA indemnity schedule should address this exposure directly.
Insufficient attention to competition law clearance thresholds. Polish competition legislation. administered by the Urząd Ochrony Konkurencji i Konsumentów (Office of Competition and Consumer Protection. Alternatively. UOKiK). applies domestic merger control thresholds that are separate from EU merger control rules. A transaction that falls below EU thresholds may still require UOKiK notification and approval. Closing a notifiable transaction without clearance exposes the acquirer to fines and, in extreme cases, unwinding orders. Lead times for UOKiK review should be built into the transaction timetable from the outset.
For a broader view of the M&A transaction environment in Poland, including deal structuring and post-acquisition integration considerations, the M&A services page for Poland outlines the full scope of transactional support available.
For a tailored strategy on M&A due diligence and deal structuring in Poland, reach out to info@ferrazwhitmore.com.
Self-assessment checklist: calibrating due diligence depth
Not every acquisition justifies the same depth of review. The following framework helps foreign acquirers calibrate the scope of due diligence to their transaction's specific risk profile.
A full-scope legal due diligence process in Poland is indicated when one or more of the following conditions are present:
- The target operates in a regulated sector – financial services, healthcare, energy, or telecommunications
- The target has more than fifty employees, collective agreements, or pending labour proceedings
- The purchase price exceeds a threshold at which warranty and indemnity insurance is commercially viable
- The target has undergone a restructuring, merger, or shareholder change in the past five years
- The acquirer intends to use the target as a platform for further acquisitions or as an EU-regulated entity
A focused or limited due diligence scope may be appropriate when:
- The transaction is structured as an asset purchase rather than a share purchase, with clearly defined asset categories
- The target is a recently incorporated single-purpose vehicle with a short operating history
- The acquirer already holds a minority stake and has had access to company records for an extended period
Before initiating formal due diligence, verify the following:
- A signed non-disclosure agreement is in place that covers all personnel on both sides with access to the data room
- The letter of intent or heads of terms clearly defines exclusivity, break fee provisions, and the anticipated timetable
- Counsel has confirmed whether UOKiK merger control notification will be required, and if so, whether this is a pre-closing or post-closing obligation
- The data room platform and document request list have been agreed with the seller's advisers
- A working group has been established covering legal, financial, tax, and – if relevant – technical or environmental workstreams
The decision tree for proceeding to SPA negotiation after due diligence in Poland should follow this logic. If no material findings are identified, proceed to SPA drafting with standard representations and warranties and a moderate escrow period. If material findings are identified but are capable of resolution before closing, build specific closing conditions into the SPA to address each finding. If material findings are identified that cannot be resolved before closing, assess whether the risk can be allocated through an indemnity, a price reduction, or a deferred consideration mechanism. If the findings indicate structural legal defects in ownership or title that cannot be remedied, consider whether the transaction remains viable on its current terms.
The economics of due diligence in Poland are straightforward. Legal fees for a standard mid-market due diligence review typically run in the range of tens of thousands of euros, depending on deal complexity and the number of workstreams. This cost is directly proportional to the exposure being assessed. A transaction completed without adequate due diligence may close faster and at lower advisory cost – but post-closing claims under Polish civil procedure rules can be significantly more expensive to resolve. The Sąd Najwyższy (Supreme Court of Poland) has consistently upheld sellers' liability for warranty breaches discovered post-closing, provided the SPA representations were properly drafted and the applicable limitation periods preserved.
Frequently asked questions
Q: How long does M&A due diligence in Poland typically take?
A: A standard legal due diligence process for a mid-market transaction in Poland takes between four and eight weeks from data room opening to final report. More complex targets with multi-entity structures, regulatory licences, or significant litigation history can extend the process to twelve weeks or beyond. Timeline depends heavily on document availability and seller cooperation.
Q: Does Polish law require notarisation of a share purchase agreement?
A: For the acquisition of shares in a Polish limited liability company, the share purchase agreement must be executed in writing with signatures notarially certified – a requirement under Polish commercial legislation. Acquisitions of shares in joint-stock companies listed on the Warsaw Stock Exchange are subject to separate capital markets rules and do not always require notarisation of the transfer instrument itself.
Q: A common misconception – does registration of a share transfer in Poland happen automatically?
A: Many foreign acquirers assume that once the share purchase agreement is signed, the transfer is legally complete. In Poland, the transfer of shares in a limited liability company is effective between the parties upon execution, but the company's share register must be updated and the change notified to the National Court Register. Until the register reflects the new ownership, third parties may not be bound by the transfer. Engaging a lawyer in Poland to manage post-signing registration steps is therefore critical to securing full legal title.
About Ferraz & Whitmore
Ferraz & Whitmore is an international law firm based in Lisbon, advising business clients across 46 jurisdictions. Our team combines Portuguese civil law expertise with English common law tradition to deliver cross-border legal solutions in M&A due diligence, transaction structuring, and post-acquisition integration. In Poland, we support international acquirers through every stage of the due diligence process – from data room scoping and corporate title review to SPA negotiation and closing condition management. We work with international entrepreneurs, institutional investors, and in-house legal teams who need results-oriented counsel across multiple legal systems. As an international law firm in Poland with dual-tradition capabilities, Ferraz & Whitmore is positioned to bridge the procedural gap between civil law transaction practice and common law deal documentation standards. Our M&A practice covers transactions across Europe, the Americas, and Asia-Pacific, supported by a network of local counsel in each market. To discuss your proposed acquisition in Poland, contact us at info@ferrazwhitmore.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. Ferraz & Whitmore 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@ferrazwhitmore.com.