15 septembre 2026 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 20 septembre 2026 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 25 septembre 2026 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 septembre 2026 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent 1 octobre 2026 Poland e-Doręczenia (Ustawa o doręczeniach elektronicznych) Poland: e-Doręczenia address becomes mandatory for CEIDG businesses registered before 2025 15 octobre 2026 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 20 octobre 2026 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 25 octobre 2026 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 octobre 2026 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent 31 octobre 2026 Poland VAT OSS (Unijna procedura One Stop Shop) Poland: VAT OSS Union-scheme return and payment due by the end of the month after each quarter Récurrent 15 novembre 2026 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 20 novembre 2026 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 25 novembre 2026 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 novembre 2026 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent 2 décembre 2026 EU AI Act AI Act : fin de la période de grâce pour le marquage des contenus générés par IA dans les systèmes préexistants ; interdiction des générateurs de deepfakes intimes non consentis 15 décembre 2026 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 20 décembre 2026 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 24 décembre 2026 eIDAS 2 Portefeuille européen d'identité numérique : chaque État membre doit proposer un portefeuille ; les organismes publics doivent l'accepter 25 décembre 2026 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 décembre 2026 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent 1 janvier 2027 Poland JPK_CIT / JPK_KR_PD (structured accounting books) Poland: JPK_CIT digital accounting-books reporting becomes mandatory for remaining CIT taxpayers 1 janvier 2027 Poland KSeF Poland: KSeF becomes mandatory for the smallest micro-entrepreneurs; penalties start 12 janvier 2027 Data Act Data Act : les fournisseurs cloud doivent cesser de facturer les frais de changement de fournisseur et de sortie des données 15 janvier 2027 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 20 janvier 2027 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 25 janvier 2027 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 janvier 2027 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent 31 janvier 2027 Poland VAT OSS (Unijna procedura One Stop Shop) Poland: VAT OSS Union-scheme return and payment due by the end of the month after each quarter Récurrent 15 février 2027 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 20 février 2027 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 25 février 2027 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 février 2027 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent 28 février 2027 Poland KOBiZE national emissions database report Poland: annual report to the national GHG/emissions database (KOBiZE) due by end of February Récurrent 15 mars 2027 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 20 mars 2027 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 25 mars 2027 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 mars 2027 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent 31 mars 2027 Poland CIT-8 annual return Poland: annual CIT-8 corporate income tax return due by 31 March Récurrent 31 mars 2027 Poland environmental-use fee (opłata za korzystanie ze środowiska) Poland: annual environmental-use fee (opłata za korzystanie ze środowiska) due by 31 March Récurrent 15 avril 2027 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 20 avril 2027 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 25 avril 2027 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 avril 2027 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent 30 avril 2027 Poland VAT OSS (Unijna procedura One Stop Shop) Poland: VAT OSS Union-scheme return and payment due by the end of the month after each quarter Récurrent 30 avril 2027 Poland PIT-36/PIT-36L annual return (self-employed) Poland: PIT-36/PIT-36L annual personal income tax return and payment due by 30 April Récurrent 15 mai 2027 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 20 mai 2027 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 20 mai 2027 Poland ZUS annual health-contribution reconciliation (self-employed) Poland: annual reconciliation of self-employed health insurance contribution due 20 May Récurrent 25 mai 2027 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 mai 2027 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent 15 juin 2027 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 20 juin 2027 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 25 juin 2027 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 juin 2027 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent 9 juillet 2027 Instant Payments Regulation Règlement sur les paiements instantanés : envoi de paiements instantanés en euros et vérification du bénéficiaire obligatoires pour les banques hors zone euro (Pologne, Suède, Tchéquie, etc.) 15 juillet 2027 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 15 juillet 2027 Poland annual financial statements - KRS/RDF filing Poland: e-financial statements filing to KRS via RDF due within 15 days of approval (by 15 July for calendar-year filers) Récurrent 20 juillet 2027 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 25 juillet 2027 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 juillet 2027 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent 31 juillet 2027 Poland VAT OSS (Unijna procedura One Stop Shop) Poland: VAT OSS Union-scheme return and payment due by the end of the month after each quarter Récurrent 15 août 2027 Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Récurrent 20 août 2027 Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Récurrent 25 août 2027 Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Récurrent 25 août 2027 Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Récurrent