2026 m. rugsėjo 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2026 m. rugsėjo 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2026 m. rugsėjo 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2026 m. rugsėjo 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis 2026 m. spalio 1 d. Poland e-Doręczenia (Ustawa o doręczeniach elektronicznych) Poland: e-Doręczenia address becomes mandatory for CEIDG businesses registered before 2025 2026 m. spalio 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2026 m. spalio 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2026 m. spalio 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2026 m. spalio 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis 2026 m. spalio 31 d. 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 Pasikartojantis 2026 m. lapkričio 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2026 m. lapkričio 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2026 m. lapkričio 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2026 m. lapkričio 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis 2026 m. gruodžio 2 d. EU AI Act DI aktas: baigiasi pereinamasis laikotarpis DI sukurto turinio žymėjimui jau veikiančiose sistemose; draudžiami neteisėtų intymių dirbtinių (deepfake) vaizdų generatoriai 2026 m. gruodžio 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2026 m. gruodžio 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2026 m. gruodžio 24 d. eIDAS 2 ES skaitmeninės tapatybės piniginė: kiekviena valstybė narė privalo pasiūlyti piniginę; viešosios įstaigos privalo ją priimti 2026 m. gruodžio 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2026 m. gruodžio 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis 2027 m. sausio 1 d. Poland JPK_CIT / JPK_KR_PD (structured accounting books) Poland: JPK_CIT digital accounting-books reporting becomes mandatory for remaining CIT taxpayers 2027 m. sausio 1 d. Poland KSeF Poland: KSeF becomes mandatory for the smallest micro-entrepreneurs; penalties start 2027 m. sausio 12 d. Data Act Duomenų aktas: debesijos paslaugų teikėjai privalo nustoti taikyti perėjimo ir duomenų išgavimo mokesčius 2027 m. sausio 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2027 m. sausio 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2027 m. sausio 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2027 m. sausio 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis 2027 m. sausio 31 d. 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 Pasikartojantis 2027 m. vasario 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2027 m. vasario 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2027 m. vasario 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2027 m. vasario 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis 2027 m. vasario 28 d. Poland KOBiZE national emissions database report Poland: annual report to the national GHG/emissions database (KOBiZE) due by end of February Pasikartojantis 2027 m. kovo 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2027 m. kovo 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2027 m. kovo 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2027 m. kovo 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis 2027 m. kovo 31 d. Poland CIT-8 annual return Poland: annual CIT-8 corporate income tax return due by 31 March Pasikartojantis 2027 m. kovo 31 d. Poland environmental-use fee (opłata za korzystanie ze środowiska) Poland: annual environmental-use fee (opłata za korzystanie ze środowiska) due by 31 March Pasikartojantis 2027 m. balandžio 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2027 m. balandžio 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2027 m. balandžio 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2027 m. balandžio 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis 2027 m. balandžio 30 d. 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 Pasikartojantis 2027 m. balandžio 30 d. 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 Pasikartojantis 2027 m. gegužės 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2027 m. gegužės 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2027 m. gegužės 20 d. Poland ZUS annual health-contribution reconciliation (self-employed) Poland: annual reconciliation of self-employed health insurance contribution due 20 May Pasikartojantis 2027 m. gegužės 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2027 m. gegužės 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis 2027 m. birželio 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2027 m. birželio 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2027 m. birželio 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2027 m. birželio 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis 2027 m. liepos 9 d. Instant Payments Regulation Momentinių mokėjimų reglamentas: euro zonai nepriklausantiems bankams (Lenkijai, Švedijai, Čekijai ir kt.) tampa privalomas momentinių euro mokėjimų siuntimas ir gavėjo tapatybės patvirtinimas 2027 m. liepos 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2027 m. liepos 15 d. 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) Pasikartojantis 2027 m. liepos 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2027 m. liepos 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2027 m. liepos 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis 2027 m. liepos 31 d. 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 Pasikartojantis 2027 m. rugpjūčio 15 d. Poland ZUS social insurance contributions Poland: ZUS social insurance contributions and DRA declaration due by the 15th (legal persons) Pasikartojantis 2027 m. rugpjūčio 20 d. Poland CIT advance payments Poland: monthly CIT advance payment due by the 20th (quarterly option for small taxpayers) Pasikartojantis 2027 m. rugpjūčio 25 d. Poland JPK_V7 (VAT records and declaration) Poland: JPK_V7M monthly VAT return and payment due by the 25th Pasikartojantis 2027 m. rugpjūčio 25 d. Poland VAT-UE summary information Poland: VAT-UE summary information (informacja podsumowująca) due by the 25th Pasikartojantis