Mandatory KSeF – last call for preparation

When does it start?

These dates apply to mandatory issuing of structured e-invoices, but not to receiving such invoices. Consequently, generally all taxpayers must be ready to accept invoices issued in KSeF on 1 February 2026. 

KSeF overhauls the way of issuing, accepting and storing invoices. A failure to implement it in your business may translate into accounting problems, delayed payments and even financial sanctions. The system requires integration with your finance and accounting systems, staff training and adjustments to processes.

The Finance Ministry has announced testing of KSeF 2.0 – a new API will be available from 30 September 2025. The Certificate and Authorisation Module (abbreviated in Polish as MCU) will launch on 1 November to allow assignment of authorisations to system users. They will be indispensable to using the National e-Invoicing System after 1 February 2026. The module will also enable applying for and downloading certificates.

This is the last call to start implementation in your company and get ready for the new invoicing reality.

Do not wait – check if your organisation is ready for KSeF! Contact us ​if you need help with the implementation, technical review or staff training. Earlier preparation means less stress and greater control over the change.