- 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
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