ZUS (the Polish Social Insurance Institution) issued a decision refusing your benefit, lowering your payment, or assessing unexpected contributions? You have one month to appeal — and despite what many people think, you don't appeal to ZUS. You appeal to a court, via ZUS.
Key rule: ZUS appeals go to court, not to an administrative body
ZUS decisions are NOT appealed through the administrative procedure (the Code of Administrative Procedure does not apply here). Art. 83(2) of the Social Insurance System Act (Dz.U. 2026 poz. 199) states plainly: ZUS decisions may be appealed to the competent court under the rules of the Code of Civil Procedure.
The specific provision: Art. 477⁹(1) of the Code of Civil Procedure — the appeal is filed in writing addressed to the labour and social insurance court, submitted via the authority that issued the contested decision. In practice: address the letter to the court, but submit or post it to ZUS.
Deadline — 1 month from delivery
Art. 477¹⁰(1) CPC: the appeal must be filed within 1 month of the date the decision was delivered. This is a procedural deadline counted from actual receipt. If delivery was by notice slip, it runs from when you collected the letter or the collection period expired.
After one month the appeal is time-barred and the court will reject it — unless you apply for reinstatement of the deadline for a valid reason (Art. 168 CPC).
What ZUS can do before the case reaches court
Art. 477¹⁰(2) CPC: ZUS has 30 days from receiving the appeal to forward it to the court — but if it accepts the appeal as well-founded during that period, it may change or annul the decision itself. This is faster and cheaper than court proceedings, so it is worth making the appeal letter clearly identify specific legal errors.
Appealing a refusal of sickness benefit (zasiłek chorobowy)
Legal basis: the Act of 25 June 1999 on Cash Benefits from Social Insurance in Case of Illness and Maternity. Art. 4: the right to benefit accrues after 30 days of uninterrupted insurance (employees) or 90 days (voluntarily insured persons such as contractors). Art. 9: previous insurance periods count toward the waiting period if the gap was no more than 30 days.
Appealing a refusal of disability pension (renta)
Legal basis: the Act of 17 December 1998 on Pensions from the Social Insurance Fund (Dz.U. 2025 poz. 1749): Art. 12 (definition of incapacity for work), Art. 57 (conditions for granting a pension). ZUS medical examiners' opinions are not final — you may file an objection with ZUS's medical committee within 14 days (Art. 14(2a)), and then appeal to court.
Court jurisdiction
Social insurance cases (including contribution disputes) are heard by the regional court (sąd okręgowy), Labour and Social Insurance Division, competent for the insured person's place of residence or the payer's registered office (Art. 477⁸ CPC). Proceedings are free of court fees for the insured (Art. 96(1)(4) of the Court Costs Act).
ZUS refused your benefit? Generate an appeal with the correct legal provisions.
Describe the decision → we generate an appeal citing Art. 477⁹ CPC and Art. 83 of the Social Insurance Act → PDF in 5 minutes. PLN 29.