Fiscal subject related
From 1 April 2025, all entities registered in the Polish register of entrepreneurs (KRS) will be required to use e-Delivery in correspondence with public authorities.
The meaning: each company must set up and activate an e-Delivery mailbox, appoint its administrators, and implement appropriate procedures. From that date, all correspondence between entrepreneurs and public entities, both sending and receiving letters, will generally have to be conducted via the e-Delivery system.
Moreover, since 1 January 2025, public administration bodies in Poland (including tax authorities and local government bodies) have been obliged to use the e-Delivery system.
Irregularities in e-Delivery can lead to serious consequences for companies, including missing the deadline for submitting a letter or so-called delivery fiction. e-Deliveries is a service for sending and receiving correspondence electronically, equivalent to sending a registered letter. This system will replace traditional (paper) correspondence sent by post, as well as e-correspondence sent by the ePUAP system.
This obligation will apply to both entrepreneurs registered in the National Court Register (companies and partnerships) as well as other entities conducting business activities (e.g., associations, foundations). Sending and receiving correspondence with public entities via e-Delivery will be free of charge. Entrepreneurs will also be able to use e-Deliveries for correspondence with other non-public entities (e.g., other entrepreneurs). However, this is not obligatory and will be a paid service.
It is important to state that sending a letter via the incorrect correspondence channel (e.g., ePUAP instead of e-Delivery) will result in the letter being deemed as not submitted (and all the negative consequences associated with this). After 14 days from the receipt of correspondence at the company’s e-Delivery address, the shipment will be considered delivered, even if the addressee does not open it (so-called fiction of delivery).
Other news from Poland
Poland to Require Mandatory Return and Disposal of Unused Cash Registers from July 2026
Poland
Author: Nikolina Basić
Poland’s Ministry of Finance plans targeted VAT Act amendments effective July 1, 2026, introducing stricter rules for handling fiscal devices. Businesses will be required to deregister and return all unused cash registers to manufacturers for disposal, with penalties for non-compliance to prevent misuse of outdated equipment. The Ministry of Finance has announced a focused set of amendments to the... Read more
Poland Sets 2027 Deadline: Simplified Invoices Must Move from Cash Registers to KSeF
Poland
Author: Nikolina Basić
Poland will temporarily allow simplified invoices issued from cash registers—including receipts with a buyer’s NIP—to remain outside the mandatory KSeF system until 31 December 2026. Starting 1 January 2027, all simplified invoices must be issued through KSeF, ending the option to generate them directly from cash registers. The introduction of the National e-Invoicing System (KSeF) in Poland is co... Read more
Pro Forma Invoices and E-invoicing: what changes after February 1, 2026?
Poland
Author: Nikolina Basić
Pro forma invoices will continue to be allowed as non-tax, purely informational business documents, but they will not be issued or processed in KSeF because they are not recognized as invoices under the VAT Act. From 2026 onwards, only legally defined VAT invoices will pass through KSeF, while pro formas may still be shared externally (PDF, email, systems) as offer or preview documents. For many y... Read more
New document was uploaded: S4F backoffice installer
S4F backoffice installer is intended for users who are installing the software for the first time. Please make sure to obtain latest version of installer and to apply all subsequent patches that are released subsequently. This package contains instruction, release notes, changelog and software packages required for deployment of this software component. This version of the Backoffice installer supports the following countries: Austria, Bulgaria, Croatia, France, Italy, Poland, Portugal, Romania, Slovakia and Slovenia. Read more
Subscribe to get access to the latest news, documents, webinars and educations.
Already subscriber? LoginMinistry of Finance of Poland Launched Demo of KSeF 2.0 Taxpayer Application
Poland
Author: Nikolina Basić
On November 15, 2025, the Polish Ministry of Finance released the KSeF 2.0 Taxpayer Application demo for testing before its February 1, 2026, launch. Users can issue and manage invoices in a simulated environment. On November 15, 2025, the pre-production environment (Demo) of the KSeF 2.0 Taxpayer Application was made available by Polish Ministry of Finance. The demo version allows users to test t... Read more
Poland prepares for Mandatory B2B E-Invoicing with new KSeF Tools- Certificates and Authorizations Module (MCU)
Poland
Author: Nikolina Basić
Starting February 1, 2026, Poland mandates B2B invoicing via the National e-Invoice System (KSeF). To support this, the Ministry of Finance released key tools, including the MCU for managing access and digital certificates, which are essential for KSeF 2.0 access. Starting February 1, 2026, Poland will require businesses to use the National e-Invoice System (KSeF) for B2B invoicing. To help compan... Read more
E-invoicing in Poland: Ministry of Finance launches demo version of KSeF 2.0 API
Poland
Author: Nikolina Basić
Poland’s Ministry of Finance has launched the pre-production (Demo) environment for the new KSeF 2.0 API, enabling businesses and software providers to test integrations under real authentication conditions. The demo, accessible at ksef-demo.mf.gov.pl, mirrors live system functionality without legal effects, supporting companies in preparing for mandatory e-invoicing rollout The Ministry of Financ... Read more