A technology company based in Warsaw had exhausted two rounds of litigation. The Court of Appeal had upheld a judgment that, in the client's view, misread the applicable contract law. The commercial stakes exceeded PLN 3m. The question was simple: was there still a legal route forward? The answer, as it turned out, was yes – but only if the cassation complaint was filed correctly and within a strict deadline.

Cassation to the Supreme Court of Poland (Sąd Najwyższy) is an extraordinary remedy available after a final appellate judgment. Polish civil procedure limits cassation to cases where the appeal court committed a material breach of procedural rules or misapplied substantive law. The complaint must be filed within two months of service of the reasoned appellate judgment. Cases below PLN 50,000 in value are generally excluded from the cassation route in civil proceedings.

This case study traces how the cassation complaint was prepared, what arguments were advanced, and what lessons apply to any business facing a final adverse judgment in Poland. The structure covers: background and admissibility, the strategic framing of grounds, the Supreme Court process, and transferable lessons for dispute planning.

Background: what made cassation available?

The client – a Warsaw-based software distributor – had lost at first instance and on appeal. The appellate court had dismissed the client's contractual indemnity claim on grounds that the indemnity clause was unenforceable. Our review identified two problems with that ruling. First, the court applied a provision governing consumer contracts to a purely commercial relationship. Second, it failed to address a line of Supreme Court authority directly on point. Both issues fell squarely within the recognised cassation grounds under Polish civil procedure.

Admissibility was the first hurdle. Polish procedural law requires that a cassation complaint demonstrate a so-called "public interest" element – broadly, that the case raises a legal question of wider significance or that the appellate judgment conflicts with established Supreme Court jurisprudence. This threshold is often underestimated by litigants. A complaint that simply argues the lower court was wrong will be rejected at the pre-screening stage. The National Court Register (KRS) records of the opposing party also revealed a restructuring filing, which added urgency: delay risked rendering any eventual victory unenforceable.

The two-month filing deadline ran from the date the reasoned judgment was served. We received instructions with 19 days remaining. That window was tight but workable. (Cassation complaints in commercial matters must be signed by an advocate or legal counsel – self-representation is not permitted before the Supreme Court of Poland.) We assembled the case file, identified the conflicting Supreme Court rulings, and drafted the complaint in parallel.

How were the cassation grounds framed?

Framing is everything in cassation practice. The Supreme Court of Poland does not re-examine facts. It reviews legal questions only. Every ground must be anchored to a specific legal error, not to a disagreement with the factual findings. Our strategy rested on two pillars: a substantive law ground and a procedural ground, each self-sufficient.

The substantive ground argued that the appellate court had misapplied commercial contract law by importing a consumer-protection doctrine into a B2B indemnity clause. We cited three prior Supreme Court rulings where the same provision had been held inapplicable to commercial parties. This created the "conflict with established jurisprudence" element required for admissibility. Crucially, we framed it not as "the court was wrong" but as "the court applied the wrong legal norm to undisputed facts."

The procedural ground targeted the court's silence on the client's primary legal argument. Under Polish appellate procedure, courts are obliged to address all material legal submissions. Failure to do so constitutes a procedural defect that can independently support cassation. We documented the submission through the appeal brief and the court's written reasons, which contained no response to it.

We also flagged the matter's connection to cross-border dispute strategy, as the opposing party had a Spanish parent company and potential enforcement questions arose in parallel. That context reinforced the "public interest" framing: the case touched on how Polish courts treat indemnity clauses in international supply chains.

What happened at the Supreme Court?

The Supreme Court accepted the cassation complaint for examination – a stage that filters out roughly 60 to 70 percent of complaints at pre-screening. Acceptance does not guarantee success; it means the court found the complaint admissible and the legal question worth addressing. The oral hearing was listed approximately eight months after filing, which is within the typical range for commercial cassation matters.

At the hearing, the presiding panel focused almost entirely on the substantive law ground. The procedural ground, while accepted, drew less attention. The panel asked pointed questions about whether the indemnity clause had been negotiated or standard-form – a factual nuance that, while not determinative, shaped the legal analysis. We had anticipated this and addressed it in the written submissions. We secured a reversal of the appellate judgment for a technology-sector client in the Mazowieckie region (spring 2026), with the case remitted to the Court of Appeal for rehearing on correct legal principles.

A remittal is the standard Supreme Court outcome. The court does not substitute its own merits judgment. It identifies the legal error, sets out the binding interpretation, and returns the matter to the appellate level. For enforcement timing, this meant a further six to nine months before a final executable judgment. The client's litigation budget had accounted for this. For those planning dispute strategy from the outset, the cassation stage should be costed as a potential additional phase – not an afterthought.

Parties engaged in enforcing foreign judgments in Poland face similar admissibility thresholds when challenging recognition decisions, making the framing principles here directly transferable.

What are the transferable lessons for dispute planning?

Cassation is not a second appeal. That distinction shapes everything. Litigants who treat it as another opportunity to re-argue the facts waste their two-month window and their cassation fee (currently PLN 3,000 to PLN 5,000 for most commercial matters, plus advocate's fees). The complaint must be built around legal error from the start.

Four practical lessons emerge from this matter:

  • Identify potential cassation grounds during the appeal, not after. The appellate brief should preserve every legal argument in writing.
  • Check the value threshold early. Cases below PLN 50,000 cannot proceed to cassation in standard civil proceedings – alternative routes must be considered.
  • Act on the two-month deadline immediately. Instruction delays of even one week can make a properly argued complaint impossible to draft.
  • Build a "public interest" hook into the legal framing. A complaint confined to the parties' private dispute rarely clears pre-screening.

A second lesson concerns internal compliance and documentation. Our team also advised on internal reporting structures for the client's Polish subsidiary, including whistleblower channel requirements that had arisen from the same contractual dispute. Dispute resolution and compliance planning are rarely separate tracks in complex commercial matters. Sanctions compliance and arbitration Poland considerations had also been raised at the outset, given the cross-border supply chain involved.

For any business engaged in litigation Warsaw or elsewhere in Poland, the cassation route is a genuine remedy – but only when pursued with precision. A dispute lawyer familiar with Supreme Court practice can assess admissibility within days of receiving the appellate judgment. That assessment should happen before the clock runs down, not after.

Your cassation window closes in two months. A poorly framed complaint forfeits the right to Supreme Court review permanently. To discuss how the cassation route applies to your matter, email info@kordeckipartners.com.

Frequently asked questions

Q: How long does the Supreme Court cassation process take from filing to decision?

A: From filing to a final Supreme Court ruling, the process typically takes between 12 and 24 months in commercial cases. This includes the pre-screening stage (two to four months), scheduling of the oral hearing (six to nine months), and delivery of written reasons. A remittal to the Court of Appeal adds a further six to twelve months before a final executable judgment is available.

Q: Is it a misconception that cassation is only for very large cases?

A: Partly. The PLN 50,000 threshold applies to standard civil proceedings, but it does not apply in certain categories – including labour disputes, family matters, and cases involving questions of constitutional significance. In commercial disputes, the threshold is real and must be checked early. Cases just above the threshold are admissible but the cost-benefit analysis should be reviewed carefully before filing.

Q: What does a KIO appeal have to do with Supreme Court cassation?

A: A KIO appeal refers to proceedings before the National Appeals Chamber (Krajowa Izba Odwoławcza, KIO), which handles public procurement disputes. KIO decisions can be challenged before the regional court and, ultimately, through the standard cassation route to the Supreme Court. The admissibility conditions and the two-month deadline apply equally in those proceedings, making early legal assessment equally important in procurement litigation.

About KORDECKI & Partners

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 commercial litigation, arbitration, and cassation proceedings before the Supreme Court of Poland. 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.