What KSeF is
KSeF (Krajowy System e-Faktur) is the central Ministry of Finance platform through which structured invoices in a unified XML format will be issued and received in Poland.
Rollout calendar
- 1 February 2026: mandatory for companies with sales above PLN 200M.
- 1 April 2026: all other VAT-registered companies.
- Until 31 December 2026: transition period with lighter penalties.
What to do now
- Audit your invoicing system: does it handle KSeF XML and the KSeF identifier?
- Tokens and authorisations: set up permissions with the tax office.
- Internal procedures: who issues, who approves, how to archive.
- Integration test: well before the deadline, not on it.
BCR GROUP clients get full migration support to KSeF as part of their accounting package.
If you're not sure your company is ready, book a consultation. 30 minutes is enough to walk through the checklist.