A Warsaw-based IT company submits a competitive tender for a public software contract. Days later, the contracting authority announces a different winner. The specification looks tailored. The evaluation appears flawed. The losing bidder has one option: a formal appeal before the Krajowa Izba Odwoławcza (National Appeals Chamber, KIO). Miss the deadline by a single day and that option disappears permanently.

The KIO is Poland's specialist tribunal for public procurement disputes, operating under the Prawo zamówień publicznych (Public Procurement Law, PZP). An appeal must be filed within 10 days of the disputed decision for contracts above EU thresholds, or within 5 days for contracts below those thresholds. The KIO must schedule a hearing within 15 days of receiving the appeal, and its ruling is binding on both parties unless challenged before the ordinary courts.

This guide walks through each stage of the KIO appeal process: from identifying the right grounds to submitting the appeal, attending the hearing, and enforcing the outcome. Three business scenarios illustrate how the procedure works in practice for domestic companies, foreign investors, and subcontractors. A checklist and FAQ cover the most common mistakes.

What grounds justify a KIO appeal?

The right grounds are the foundation of any successful appeal. Polish procurement law permits challenges against any act or omission by a contracting authority that violates PZP provisions and affects the appellant's interest in obtaining the contract. Three categories dominate KIO practice: unlawful exclusion of a bidder, rejection of an offer, and specification drafting that restricts competition.

Unlawful exclusion is the most common ground. A contracting authority may incorrectly apply mandatory or discretionary exclusion criteria, or fail to give the bidder a proper opportunity to clarify documents. The KIO regularly overturns exclusions where the authority skipped the required remediation step – a formal invitation to supplement or explain submitted materials. That step is mandatory, and omitting it is a procedural error the Chamber treats seriously.

Specification challenges require early action. If the tender specification itself breaches PZP – for example, by requiring brand-specific products or setting disproportionate financial thresholds – the appellant must file within 10 days of the specification being published (5 days below EU thresholds). Waiting until the award decision forfeits the right to challenge the specification. This is one of the most expensive mistakes in Polish procurement practice. Our team obtained a suspension of a public IT tender for a technology client in Mazowieckie (spring 2026), preventing the client from being locked out before the specification defect was corrected.

A third frequent ground is evaluation methodology. Where the contracting authority applies scoring criteria in a manner inconsistent with the tender documentation, or awards points based on undisclosed sub-criteria, the KIO will examine the evaluation record in detail. Appellants should gather the evaluation committee's written reasoning before filing – it is disclosed on request within the National Court Register (KRS) procurement portal and the Public Procurement Office (Urząd Zamówień Publicznych, UZP) database.

What are the KIO appeal deadlines and filing requirements?

Deadlines in KIO proceedings are absolute. Polish procurement law sets a 10-day appeal window for contracts at or above EU thresholds, running from the day the appellant learned of the disputed act. For below-threshold contracts, the window shrinks to 5 days. A single missed day closes the appeal path entirely – the KIO has no discretion to admit a late filing.

The appeal must be filed simultaneously with the KIO and served on the contracting authority on the same day. Serving only one of the two recipients on time does not satisfy the requirement. The filing fee must also accompany the submission: PLN 7,500 for supply and service contracts up to EU thresholds, rising to PLN 15,000 for contracts above those thresholds, and PLN 20,000 for construction works above thresholds. Failure to pay the correct fee results in rejection without examination.

The written appeal must identify: the contracting authority, the challenged act or omission, the legal basis for each ground, the factual circumstances supporting each ground, and the specific remedy requested. Vague or generic pleadings – "the evaluation was unfair" without identifying the specific scoring error – are routinely dismissed. The KIO expects precision. Each ground should map to a specific PZP provision and a specific factual event.

For foreign investors, an additional consideration applies. Under Polish procurement rules, a foreign contractor must designate a representative in Poland for service of process. Entities registered in the European Union may serve documents through their EU address, but delays in cross-border service are common. (The Public Procurement Office maintains an English-language summary of the process, though the official proceedings remain in Polish.) Companies advised by dispute lawyers with Warsaw offices avoid this bottleneck entirely.

How does the KIO hearing procedure work?

Once the appeal is admitted, the KIO notifies the contracting authority and any other parties who joined the proceedings. Other bidders may join as participants on either side within 3 days of the notice being published. This joinder right matters: a competitor who supports the contracting authority's decision can present evidence and arguments at the hearing, effectively becoming a second respondent.

The hearing takes place within 15 days of the appeal being filed. KIO hearings are oral and adversarial. Each side presents its case, calls witnesses or experts if needed, and responds to questions from the three-member panel. The panel may also request additional documents from the contracting authority, including the full evaluation record and procurement committee minutes. Proceedings are conducted in Polish, so foreign parties require qualified legal representation and, where necessary, a certified interpreter.

Evidence rules at the KIO differ from general civil litigation in Warsaw courts. The Chamber applies a standard of balance of probabilities rather than the stricter civil standard. Documentary evidence dominates: technical specifications, evaluation scoresheets, correspondence with the authority, and expert opinions on technical parameters. Witness testimony is less common but permitted. Parties should submit all documentary evidence with the initial filing – introducing new documents at the hearing is possible but tactically weaker.

The KIO issues its ruling on the day of the hearing or within 3 days thereafter. The ruling is accompanied by written reasons, typically delivered within 3 days of the oral decision. If the KIO upholds the appeal, it may order the contracting authority to repeat the evaluation, correct the specification, or – in the most serious cases – annul the entire procedure. A ruling ordering re-evaluation of a specific bidder's offer is the most common remedy in practice.

What happens after the KIO ruling?

A KIO ruling is immediately enforceable. The contracting authority must implement it without delay. If the ruling orders re-evaluation, the authority must complete that step before signing the contract. Signing a contract in breach of a KIO ruling exposes the contracting authority to administrative sanctions and, in some cases, personal liability of the responsible official.

Either party may challenge the KIO ruling before the Regional Court (Sąd Okręgowy) in Warsaw within 14 days of receiving the written reasons. The court appeal suspends enforcement of the KIO ruling automatically, which is a significant tactical point. A contracting authority that loses before the KIO but files a court appeal may lawfully delay implementation for months. Appellants should factor this possibility into their timeline planning.

We secured a reinstatement of a client's tender evaluation for a construction subcontractor in Silesia (autumn 2025), following a KIO ruling that the authority had applied undisclosed sub-criteria. The contracting authority did not appeal to the Regional Court, and the contract was re-awarded within 6 weeks of the KIO decision.

If the contracting authority fails to comply with a KIO ruling voluntarily, the appellant may apply to the Regional Court in Warsaw for enforcement. The court will examine whether the ruling is clear and whether the authority has had sufficient time to comply. Non-compliance is treated as contempt of an administrative decision and carries financial penalties. In practice, contracting authorities comply with KIO rulings in the overwhelming majority of cases – the enforcement route is rarely needed but remains available.

  • File the appeal and serve the contracting authority on the same day.
  • Pay the correct filing fee with the submission – check the contract value against current thresholds.
  • Attach all documentary evidence to the initial appeal – do not rely on introducing documents at the hearing.
  • Monitor the 3-day joinder window for other bidders entering the proceedings.
  • Plan for the possibility of a Regional Court challenge extending the timeline by 3–6 months.

For a tailored strategy on KIO appeal proceedings, reach out to info@kordeckipartners.com.

Three business scenarios: manufacturing, IT, and foreign investors

The KIO process applies uniformly across sectors, but the practical challenges differ. Understanding how the procedure plays out in three common scenarios helps contractors prepare the right strategy before the deadline arrives.

Manufacturing contractor. A Wielkopolska-based manufacturer is excluded from a public supply tender on the ground that its quality management certificate did not cover the specific product category required. The exclusion was issued without a prior invitation to supplement documents. Under PZP, the contracting authority must issue that invitation before excluding a bidder for a curable document deficiency. The manufacturer files a KIO appeal within 10 days, attaches the original certificate and the authority's exclusion letter, and requests reinstatement. The KIO upholds the appeal on procedural grounds. Total elapsed time from exclusion to KIO ruling: 22 days.

IT services company. A Warsaw-based software firm loses a public digitalisation tender. The evaluation scoresheet shows that a competitor received maximum points for a criterion described in the specification as "experience with similar projects" – but the authority applied an undisclosed minimum project-value sub-criterion. The IT firm requests the full evaluation record under the public information access procedure, receives it within 3 days, and identifies the discrepancy. It files a KIO appeal challenging the evaluation methodology. This scenario also illustrates the intersection with EU funds compliance requirements, since many public digitalisation contracts draw on KPO or RRF financing and carry additional audit obligations for the contracting authority.

Foreign investor. A German construction group submits a bid for a Polish infrastructure project through its Polish subsidiary. The subsidiary is excluded on the basis of a sanctions screening check that flagged a group entity in a different jurisdiction. The contracting authority did not verify whether the flagged entity was actually involved in the Polish contract. Sanctions compliance in procurement contexts is a distinct area – see our analysis of sanctions screening obligations for Polish companies. The subsidiary appeals, providing evidence that the flagged entity has no role in the contract performance. The KIO orders re-examination of the exclusion decision within 15 days. For foreign investors generally, our guide on dispute resolution for companies doing business in Poland covers the broader litigation and arbitration framework.

Across all three scenarios, the decisive factors are the same: identifying the correct ground, gathering documentary evidence before filing, and meeting the 10-day or 5-day deadline without exception.

Your company's specific situation may involve overlapping grounds, joinder by a competitor, or a contracting authority that has already signed the contract. Each of these variables changes the procedural path. To receive an expert assessment of your procurement dispute, contact info@kordeckipartners.com.

Frequently asked questions

Q: Can a subcontractor file a KIO appeal if the prime contractor is excluded?

A: A subcontractor does not have standing to file a KIO appeal in its own name unless it is itself a party to the procurement procedure. However, a subcontractor can support an appeal filed by the prime contractor by joining the proceedings as a participant within 3 days of the notice being published. If the subcontractor's own interests are directly affected – for example, because the specification unlawfully restricts subcontracting – it may have independent standing, but this requires careful analysis of the specific procurement documents.

Q: How much does a KIO appeal cost in total, including legal fees?

A: The mandatory filing fee ranges from PLN 7,500 to PLN 20,000 depending on contract type and value. Legal representation costs vary based on the complexity of the grounds and whether expert opinions are required. If the appeal is upheld, the KIO may order the contracting authority to reimburse the filing fee and a portion of legal costs – the reimbursable legal fee is capped under procurement regulations. A common misconception is that the full legal fee is always recoverable; in practice, only the statutory cap is awarded, which may be lower than actual costs.

Q: Does filing a KIO appeal automatically suspend the procurement procedure?

A: Not automatically in all cases. For contracts above EU thresholds, filing a KIO appeal does suspend the contracting authority's right to sign the contract until the KIO rules. For below-threshold contracts, the suspension is not automatic – the appellant must separately apply for interim measures (a "zakaz zawarcia umowy" order). This distinction is frequently misunderstood. A contractor who assumes the contract is frozen after filing a below-threshold appeal may discover the contract has been signed while the appeal was pending, leaving only a damages claim rather than reinstatement.

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 public procurement disputes, KIO appeals, and commercial litigation. 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.