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KSeF: New Changes and Challenges for Entrepreneurs with Mandatory e-Invoicing System by 2026

  • The Ministry of Finance has proposed a VAT law amendment introducing a mandatory National e-Invoice System for large companies from February 2026 and for other taxpayers from April 2026.
  • The proposal includes changes such as offline invoice issuance and attachment submission after prior notification.
  • Expert Janina Fornalik notes the short implementation timeline as a major challenge, urging businesses to start preparations now.
  • The final version of the regulations is expected in July, with executive orders likely in the fall.
  • The project introduces an offline24 mode allowing invoices to be sent to the system the next business day.
  • Business organizations suggest extending the submission period to three business days.
  • In practice, if an invoice is sent later than its issuance date, it will be considered offline, simplifying the process for companies.

Source: mddp.pl

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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