- Poland’s National e-Invoice System (KSeF) becomes mandatory for large B2B taxpayers from 1 February 2026 and for all remaining businesses from 1 April 2026.
- B2B invoices must use the FA(3) XML schema; B2G invoices can still use Peppol BIS Billing 3.0 via the PEF platform.
- Invoices are submitted to KSeF for validation and assignment of a unique reference before buyers can retrieve them.
- The system aims to standardize invoicing, reduce fraud, and improve VAT transaction visibility for tax authorities.
- Businesses must ensure compliance by adapting their invoicing processes, managing authentication, error handling, and having contingency plans for outages.
Source: ecosio.com
Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.
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