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Deadlines

KSeF dates that matter: mandatory start, transition periods and what has to be ready by when.

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Deadlines
KSeF deadlines: who must switch and when

KSeF (Krajowy System e-Faktur) is Poland's national e-invoicing system, and the obligation to issue structured invoices applies to active VAT taxpayers in a phased way: when a company must switch depends on its size under the schedule published by the Ministry of Finance. The rollout has been postponed more than once, so confirm the date that applies to you against the current official schedule before acting. What does not change is the technical requirement — once your obligation applies, B2B invoices must be issued as structured FA(3) XML with a KSeF number and a UPO.

TomekOct 12, 20263 min read
KSeF
KSeF readiness checklist for small businesses

Readiness for KSeF means having your party data, invoice fields, authentication method and a tested flow in place before your obligation applies. Work through a short checklist — buyer and seller NIPs, FA(3) field mapping, token authentication and a TEST run — so the switch is mechanical rather than a scramble.

TomekOct 12, 20263 min read

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