“Wednesdays with KSeF” is a series of free training sessions and webinars organised by the Ministry of Finance to help businesses prepare for the implementation of the mandatory National e-Invoice System.

Module IV – 29 October, at 10:00 a.m. and 3:00 p.m. – ZZ – Certificates and Authorisations Module (MCU)

Meetings will be held on Wednesdays, both in person and online, so that everyone can participate in a convenient format. The series will begin on 24 September 2025 and continue until mid-December 2025.

The National e-Invoice System (KSeF) is a system used to issue, send, receive and store structured invoices.

The obligation to issue invoices through KSeF will take effect from:

  • 1 February 2026 for businesses whose sales value, including tax, exceeded PLN 200 million in 2024,
  • 1 April 2026 for all other businesses.

For the smallest taxpayers, whose transactions involve small amounts (with total monthly sales of up to PLN 10,000), the implementation deadline will be postponed until 1 January 2027.

Further dates will be announced soon

  • Module V – Granting authorisations and issuing invoices in KSeF by local government units, VAT Groups and flat-rate farmers
  • Module VI – Free KSeF tools – KSeF Mobile Application
  • Module VII – Free KSeF tools – KSeF Taxpayer Application
  • Module VIII – Free KSeF tools – e-microbusiness connected to KSeF and additional KSeF functionalities

Each meeting is an opportunity to gain knowledge, ask experts questions and exchange experiences with other participants.

Detailed information about the dates and ways to participate in the free training sessions is published on the websites of the Tax Administration Chamber in Wrocław, the Lower Silesian tax offices Wednesdays with KSeF – Tax Administration Chamber in Wrocław – Gov.pl Portal and on the website ksef.podatki.gov.pl.