Fiscal subject related
The signed act provides for the necessary postponement of the date of entry into force of the mandatory KSeF to February 1, 2026, and maintains six-month deferrals (until the end of July 2026) of some obligations related to the KSeF. In order to give entrepreneurs the opportunity to become better acquainted with the proposed changes and to undergo reliable consultations, the Ministry of Finance decided to divide the legislative work on the act amending the KSeF Act into two parts.
In the second legislative draft, the ministry will present proposals to simplify the obligations related to the implementation of the KSeF and propose the phased entry into force of the mandatory KSeF:
- February 1, 2026, for entrepreneurs whose sales value (including the tax amount) exceeded PLN 200 million in 2025,
- April 1, 2026, for other entrepreneurs
Another novelty is that a production version of the KSeF Mobile Application has been made available by the Ministry of Finance. The production version of the KSeF Mobile Application allows for issuing basic invoices and corrections on smartphones, as well as viewing received and issued invoices. Despite the postponement, the Ministry of Finance continues to provide free tools for taxpayers to use the KSeF system, with the mobile application available on Google Play and the App Store. More information about the service can be found on the website of the Ministry of Finance: KSeF Mobile Application.
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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
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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
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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
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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