# KSeF

Krajowy System e-Faktur — the Polish national e-invoicing platform mandatory for most B2B from February 2026.

## Definition

Krajowy System e-Faktur — the Polish national e-invoicing platform mandatory for most B2B from February 2026.

## Explanation

Uses the FA(2) XML structured invoice schema; KSeF assigns a unique invoice number and timestamp on acceptance.

Mandatory rollout: February 2026 for taxpayers above PLN 200M turnover, April 2026 for the rest, with ViDA-aligned EN 16931 mapping under discussion.

## Related resources

- [Poland e-invoicing guide](/resources/countries/poland)

## Related terms

- [E-reporting](/resources/glossary/e-reporting): Digital reporting of transaction data to tax authorities, often alongside e-invoicing.
- [ViDA](/resources/glossary/vida): VAT in the Digital Age: EU initiative driving e-invoicing and digital reporting requirements.
- [Real-time reporting](/resources/glossary/real-time-reporting): Reporting transaction data shortly after issuance, often mandated by tax regimes.