As of April 2026, it will become mandatory for all taxpayers to issue invoices through the Krajowy System e-Faktur (KSeF) — the National e-Invoicing System.
This reform is part of the Polish Ministry of Finance’s digital transformation strategy, aiming to simplify tax monitoring and standardize invoicing processes between businesses.
-
Large taxpayers (duzi podatnicy): February 2026
-
All other companies: April 2026
After these dates, all invoices must be issued exclusively via the KSeF platform.
Implementation Timeline
- Large taxpayers (duzi podatnicy): February 2026
- All other companies: April 2026
What Is KSeF?
KSeF (Krajowy System e-Faktur) is Poland’s national electronic invoicing system developed by the Ministry of Finance.Invoices issued through KSeF are:
- Created in a standard XML format,
- Stored on government servers,
- Exchanged directly between the supplier and the recipient.
1. Check Your Accounting Software
Verify that your current accounting or invoicing software is compatible with KSeF.
Using non-compliant tools may result in invalid invoices and potential penalties.
2. Train Your Staff
Since invoicing and submission procedures will change completely, your team must become familiar with the new system.
Early preparation and internal training will make the transition smoother.
3. Coordinate with Your Business Partners
Ensure that your suppliers and clients are also ready to switch to KSeF.
Any mismatch in readiness could cause delays in invoicing and payments.
4. Avoid Penalties Through Early Preparation
Issuing invoices outside KSeF or in the wrong format may lead to financial penalties.
Early adaptation and professional guidance will help minimize such risks.
How Art Sign Trade and Consulting Can Help
At Art Sign Trade and Consulting, we assist businesses in Poland with every stage of the KSeF transition process, including:
- KSeF compliance consulting
- Software compatibility and integration support
- Staff training and information sessions
- Process management and technical assistance