KSeF Mandatory for All Taxpayers

As of today, the obligation to issue structured invoices via the National e-Invoicing System (KSeF) has become mandatory for almost all VAT taxpayers in Poland.

This marks a fundamental shift in invoicing practices and affects all businesses operating in Poland.

Key implications:

• All invoices must now be issued in structured (XML) format via KSeF
• Traditional PDF/paper invoices are no longer compliant for B2B transactions
• ERP and accounting systems must be fully integrated with KSeF
• New rules apply to invoice issuance, delivery, and archiving

What businesses should do:

1. Ensure full technical readiness and system integration
2. Verify internal invoicing procedures and workflows
3. Train finance and accounting teams
4. Review contracts (e.g. invoicing clauses, acceptance rules)

Non-compliance may result in penalties and operational disruptions.

If you need support with implementation, compliance or reviewing your processes — feel free to reach out.

Author: Aleksander Skirpan.