Poland e-invoicing mandate
B2G
KSeF live since 2022 (voluntary)
B2B mandate
Mandatory: large taxpayers from 1 Feb 2026, most B2B from 1 Apr 2026, micro-enterprises from 1 Jan 2027
Format / channel
FA_VAT/KSeF via the centralized government platform (Ministry of Finance)
What CrateAPI offers
| Endpoint | Notes |
|---|---|
POST /v1/generate/ksef | FA_VAT schema FA(2), pre-flight only — not submitted to KSeF. |
POST /v1/validate/kseffree | XSD-structural validation before you upload to KSeF. |
Not legal or tax advice. Mandate dates and thresholds change - verify against your country's official source before relying on any date above. CrateAPI checks document format conformance; it does not track legal obligations for you.