E-invoicing

KSeF (Krajowy System e-Faktur)

Poland's national e-invoicing system. Structured invoices are issued through the platform and receive an official number that makes them legally delivered.

What KSeF (Krajowy System e-Faktur) means

KSeF is the central clearance platform of the Polish Ministry of Finance. An invoice is created in the FA structured XML schema, sent to KSeF, validated and assigned a KSeF number. From that moment it is considered issued and delivered to the buyer, who retrieves it from the platform. The tax authority sees every invoice in real time.

After a voluntary phase from 2022, the mandate applies to larger businesses from February 2026 and to all other VAT payers from April 2026, with transitional rules for the smallest issuers and for invoices from cash registers. Paper and PDF invoices between businesses stop being valid once the mandate applies. Kontevia is prepared for KSeF: it produces the FA schema, stores the KSeF number with the document and reads invoices downloaded from the platform.

Related terms

E-invoice (electronic invoice)An invoice issued, sent and received in a structured electronic format that software can process automatically. A PDF is not an e-invoice under EU law.FatturaPAThe Italian national e-invoice format that must pass through the SdI exchange system. Italy has run mandatory B2B e-invoicing since 2019.EN 16931The European standard that defines the data model of an electronic invoice. Every EU e-invoicing format is built on it or maps to it.Ryczałt od przychodów ewidencjonowanych (Poland)The Polish lump-sum tax on recorded revenue: income tax as a percentage of turnover, with rates depending on the activity, instead of tax on profit.

This entry is general information, not tax advice. Rules change; check the current position with your adviser or the tax authority of your country.

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Kontevia applies these rules for you

Rates, thresholds and e-invoicing formats come from the jurisdiction data of your country. You send the document, Kontevia books it and keeps the VAT summary ready.

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