Vendor Due Diligence Process in Poland (2026), Step-by-step Seller Checklist

The vendor due diligence process in Poland is the structured exercise a seller undertakes, before approaching the market, to identify, document and, where possible, remediate legal, tax, financial and operational risks in the target company. In 2026, the scope of seller due diligence has expanded: amendments to the Labour Code (Kodeks pracy) governing employment-tenure calculations, holding-law reforms under the Commercial Companies Code (Kodeks spółek handlowych, “KSH”), and updated transfer-tax guidance all add new disclosure obligations for sellers of Polish targets.

This guide sets out every step, document and deadline a seller, CFO, general counsel or private-equity sponsor needs to follow to commission, execute and deliver a vendor due diligence (“VDD”) package that shortens buyer diligence, reduces post-closing liability and meets current 2026 Poland M&A requirements.

Overview of the Vendor Due Diligence Process and Who It Applies To

Vendor due diligence is a seller-commissioned review, typically covering legal (LVDD), financial (FDD), tax (TDD) and, increasingly, employment and ESG workstreams, that produces an independent report for prospective buyers. The main phases of an M&A process in Poland follow a well-established sequence: seller readiness and VDD preparation, market launch or auction, buy-side due diligence, SPA negotiation, regulatory filings (including, where thresholds are met, notification to UOKiK, Poland’s competition authority), signing and closing.

VDD applies to sellers of Polish targets regardless of ownership structure, corporate trade sellers, private-equity portfolio companies, holding-group subsidiaries and foreign parents divesting a Polish subsidiary. It should be distinguished from vendor assistance (“VA”), in which the seller’s advisors merely coordinate data-room access without producing an independent risk report. A full VDD goes further: it delivers a risk-rated report with remediation recommendations and suggested warranty language, giving buyers comfort and often accelerating the transaction timeline.

Eligibility and Prerequisites for Vendor Due Diligence in Poland

Any seller can commission VDD, but it delivers the greatest value where the target is complex, regulated, has a multi-year operating history, or will be marketed through a competitive auction. Private-equity sellers routinely commission VDD to maximise sale-price certainty and limit warranty exposure. Corporate divestors with limited in-house deal teams also benefit, because VDD front-loads document gathering and risk identification before buyer scrutiny.

Before the VDD process begins, certain prerequisites must be in place. The target’s KRS filings (National Court Register) should be current, share registers reconciled, financial statements signed, tax returns filed and employment records complete, including the historical employment-tenure data now required following the 2026 Labour Code reform. IP registers and material-contract summaries should be accessible, and group or holding-structure documentation must be formalised in line with KSH holding-law amendments. Foreign sellers of Polish subsidiaries face the same documentary requirements for the Polish target itself, although cross-border tax and withholding-tax implications may necessitate an additional local tax opinion.

When to Choose a Full LVDD, FDD and TDD vs. a Limited-Scope VDD

Legal due diligence in Poland encompasses the review of corporate records, contracts, litigation, licences, real estate, employment and regulatory compliance. A full-scope VDD (legal + financial + tax) is standard for mid-market and larger transactions. Sellers of smaller businesses or single-asset targets may commission a limited-scope legal VDD only, supplementing it with a financial fact book. The decision turns on deal value, buyer expectations and the complexity of the target’s regulatory environment.

Step-by-Step Vendor Due Diligence Procedure

The seller’s VDD goals are to eliminate information gaps, standardise disclosures, produce a seller disclosure schedule aligned to anticipated SPA representations, and build a virtual data room that allows buyers to complete their own diligence efficiently. The procedure below follows five core steps.

Step 1: Define the Scope and Assemble the VDD Team

The seller’s general counsel or deal sponsor appoints a lead external law firm, a tax adviser and, where a full VDD is required, a financial due diligence provider. Together, they agree the scope of work, deliverables and project timeline. Key deliverables to define at this stage include the VDD report format (typically a risk-rated executive summary plus detailed annexes), a red-flags memo, and a Q&A tracker template that will be used to manage buyer queries post-launch.

• Responsible party: Seller GC or deal sponsor + external advisors.
• Key documents at this stage: Engagement letters, scope-of-work matrix, NDA template for buyer distribution.
• Typical duration: 1–2 weeks.

Step 2: Collect Data and Build the Virtual Data Room

The seller compiles the documents listed in the required-documents checklist below and uploads them to a virtual data room (“VDR”). Best practice is to produce a numbered index that mirrors the VDD report structure, use consistent file naming (language, date format), apply watermarking to sensitive documents, and provide certified translations of key corporate and regulatory documents into English where cross-border buyers are anticipated.

• Responsible party: Seller operations and finance teams + VDD project manager.
• Key deliverables: Populated VDR with permissions matrix, document index, translation log.
• Typical duration: 2–6 weeks, depending on the target’s document-readiness.

Step 3: Conduct the Legal, Tax and Employment Review

External advisors now perform the substantive M&A due diligence. The legal team reviews corporate records, KRS filings, the share register, board and shareholder minutes, material contracts (flagging change-of-control clauses), litigation, licences, environmental permits, IP, and real-estate titles. The tax team examines CIT and VAT returns, transfer-pricing documentation, tax rulings and correspondence with authorities. The financial team reviews audited accounts, management accounts and working-capital trends.

In 2026, the employment workstream requires particular attention. Under the amended Labour Code, employment-tenure (staż pracy) calculations now follow revised rules that affect severance entitlements, notice periods and benefit accruals. VDD teams must verify that the target holds accurate, reconstructed tenure records and that employment contracts reflect the current statutory position. Group and holding documentation, intercompany agreements, group declarations and governance structures required under KSH holding-law reforms, must also be collected and reviewed.

• Responsible party: External LVDD, TDD and FDD teams; seller provides access and responds to queries.
• Output: Red-flags list, remediation plan, suggested representations-and-warranties carve-outs.
• Typical duration: 2–6 weeks.

Step 4: Prepare the Seller Disclosure Schedule and Remediation Plan

Working alongside lead counsel, the seller prepares a disclosure schedule mapped to anticipated SPA representation categories: corporate, financial, tax, employment, contracts, IP, real estate, litigation, regulatory and environmental. Each disclosure entry identifies the issue, quantifies contingent liabilities where possible, references supporting documents in the data room, and proposes a remedy (indemnity cap, escrow, insurance or contractual carve-out).

For 2026 transactions, the disclosure schedule should specifically address employment-tenure calculations under the amended Labour Code, holding-structure arrangements under KSH, and real-estate transfer-tax positions under updated guidance.

• Responsible party: Seller + lead counsel.
• Typical duration: 1–3 weeks (runs in parallel with Step 3).

Step 5: Deliver the Final VDD Report, Executive Summary and Q&A

The VDD team delivers the final report, which includes a risk-rated executive summary (low / medium / high for each category), suggested covenant and warranty language, and a remediation tracker. The seller uses this report in management presentations to shortlisted buyers. Only the executive summary, not the full privileged report, is typically shared with buyers; care must be taken to avoid inadvertent waiver of legal privilege.

• Responsible party: VDD teams; seller approves release.
• Typical duration: 1 week after review completion.

Required Documents for Vendor Due Diligence in Poland, Checklist

Completeness of the data room is the single most important factor in reducing buyer price-chipping and minimising post-closing warranty claims. The table below sets out the core due diligence checklist for a Polish target. Sellers should treat it as a minimum; regulated industries (financial services, pharmaceuticals, energy) will have additional sectoral requirements.

How to Prepare a Seller Disclosure Schedule

A seller disclosure schedule should mirror the representations in the anticipated SPA. For each representation category (corporate, financial, tax, employment, contracts, IP, real estate, litigation, regulatory, environmental), list specific disclosures, cross-reference supporting data-room documents by index number, and propose a remedy, whether that is a price adjustment, indemnity, escrow holdback or warranty carve-out. Quantify liabilities wherever possible; vague disclosures invite buyer objections and price reductions.

Document Formatting Best Practice

Use a numbered index that corresponds to the VDD report sections. Bookmark PDFs, apply consistent date formatting (DD.MM.YYYY) and include a translation log identifying which documents have certified English translations. Redact privileged internal legal memos before upload and maintain a separate counsel-only folder for sensitive work product.

Timeline and Key Deadlines for Vendor Due Diligence in Poland

The overall timeline from VDD launch to SPA signing varies with deal complexity. The table below provides calibrated ranges for three common deal profiles.

A typical SME transaction in Poland, without merger-control complications, completes in 3–6 months from VDD launch to closing. Complex cross-border or regulated deals involving UOKiK merger notification can take 6–12 months or longer. Where a concentration requires notification, UOKiK’s statutory review periods apply; early engagement with competition counsel is essential to avoid delays.

Costs, Fees and Tax Considerations for Vendor Due Diligence in Poland

Seller costs fall into several categories: advisory fees, data-room costs, translation expenses, internal staff time and, depending on deal structure, regulatory filing fees and transfer taxes. The table below provides market-benchmark ranges; actual fees vary with target size and transaction complexity.

Sellers should also consider the tax structuring of the sale itself. Transfer tax on real estate and on shares in companies whose assets are predominantly real-estate-based can materially affect net proceeds. Withholding tax and CIT on sale proceeds require advance planning, particularly for foreign sellers. Engaging a local tax adviser early in the vendor due diligence process in Poland is critical to identifying these exposures before they surface as buyer price-adjustment requests.

What Changes in 2026, Law and Regulatory Updates Affecting Vendor Due Diligence in Poland

Three legislative developments effective in 2026 directly expand the scope of seller disclosure in Polish M&A transactions:

• Labour Code reform, employment-tenure (staż pracy) calculations. Amendments to the Labour Code, published as the Act of 2025 (Dz.U. 2025 poz. 1423) and entering into force on 1 January 2026, change how employment tenure is calculated. This affects severance entitlements, statutory notice periods and benefit accruals. Sellers must now assemble and disclose historical employment-tenure records covering the revised calculation methodology.
• KSH holding-law reform. Amendments to the Commercial Companies Code formalise group-of-companies structures, requiring group declarations, intra-group agreements and documented governance arrangements. Sellers operating within holding groups must produce this documentation in the VDD data room.
• Transfer-tax and real-estate tax guidance updates. Updated 2026 tax factsheets clarify rates, thresholds and the treatment of share deals involving real-estate-heavy companies. Sellers should document all real-estate holdings and prepare a transfer-tax position paper as part of the tax due diligence workstream.

The practical effect is that buyers will insist on specific indemnities around employment-tenure accuracy, holding-structure compliance and real-estate tax exposure. Early indications suggest that sellers who address these items proactively in the VDD report achieve smoother negotiations and narrower warranty packages.

Common Pitfalls and How to Avoid Them

• Incomplete employment records after the 2026 tenure reform. Reconstruct historical tenure data, prepare explanatory memos where records are partial, and obtain written employee confirmations of service periods where feasible.
• Undisclosed group or holding arrangements under the new KSH rules. Prepare a group charter, execute intercompany agreements and include a clear organisational chart in the data room.
• Missing or unclear real-estate title documentation. Obtain up-to-date land-and-mortgage register extracts and prepare a transfer-tax position paper before buyers raise the issue.
• Failing to quantify contingent liabilities. Provide quantified liability schedules, including sensitivity tables in the VDD report, rather than vague narrative disclosures.
• Inadvertent sharing of privileged work product with buyers. Redact internal legal memos before data-room upload and maintain a separate counsel-only folder. Share only the executive VDD summary, not full privileged analysis.

As a general discipline, use a red / amber / green risk ranking throughout the VDD report and negotiate narrowly tailored representations, warranties and escrow arrangements.

Conclusion

The vendor due diligence process in Poland in 2026 demands earlier preparation and broader disclosure than in prior years. Employment-tenure records under the amended Labour Code, holding-structure documentation under KSH reforms, and updated transfer-tax position papers must all feature in the seller’s data room. Sellers who follow the step-by-step procedure outlined above, from scoping and team assembly through to a risk-rated VDD report and carefully structured disclosure schedule, will shorten buyer diligence cycles, reduce warranty exposure and protect transaction value.

Sources

1. ELI, Amendment to the Labour Code (Dz.U. 2025 poz. 1423)
2. ISAP / Sejm, Commercial Companies Code (Kodeks spółek handlowych) consolidated texts
3. UOKiK, Concentration / Merger Control
4. RSM Poland, Real Estate Tax Factsheet 2026
5. Grant Thornton Poland, Legal Due Diligence of Companies in Poland
6. RSM Global / RSM Poland, Legal Vendor Due Diligence
7. Dudkowiak & Putyra, Due Diligence of a Polish Company
8. British-Polish Chamber of Commerce, Due Diligence in Poland