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Poland's National e-Invoice System (e-invoicing)
KSeF (Krajowy System e-Faktur) is Poland's centralized government electronic invoicing platform, administered by the Ministry of Finance. From 2026, it becomes mandatory for all VAT taxpayers.
Krajowy System e-Faktur
Polish Ministry of Finance
~2.5M VAT taxpayers
XML (FA(2) schema)
10 years by government
~10 seconds
KSeF (Krajowy System e-Faktur, or National e-Invoice System) is Poland's government platform for issuing, transmitting, and storing structured electronic invoices in XML format.
The system acts as a central hub through which all B2B invoices in Poland pass. Each invoice receives a unique KSeF number and is stored by the state for 10 years.
February 1, 2026
Large Companies + Receiving
Companies with turnover >200M PLN must ISSUE via KSeF. ALL businesses must be ready to RECEIVE invoices.
April 1, 2026
Small & Medium Businesses
Mandatory KSeF issuing for businesses with monthly sales >10,000 PLN.
January 1, 2027
Micro-businesses + Penalties
Mandatory for micro-businesses (≤10k PLN/month). Financial penalties of up to 100% VAT begin.
| Feature | Traditional | KSeF |
|---|---|---|
| Invoice Format | PDF, paper | XML (structured) |
| Delivery | Email, postal | Automatic via API |
| Proof of Delivery | None or confirmation | Official UPO |
| Archiving | Self-managed (10 years) | Government (10 years) |
| Authenticity Check | Difficult | Instant |
| VAT Refund | 60 days | 40 days |
| Legal Status | Document | Official document |
40 days instead of 60 - get your money from the tax office 33% faster.
KSeF invoices have official document status. Debtors cannot claim they didn't receive the invoice.
No need to store invoices - KSeF does it for 10 years. No more filing cabinets.
Purchase invoices automatically flow into your system. No more manual data entry.
Yes. From February 1, 2026, all businesses must receive invoices via KSeF. From April 1, 2026, most must also issue. Only micro-businesses (≤10k PLN/month) can wait until January 2027.
No penalties until end of 2026. From January 2027, penalties can reach 100% of the VAT amount. Also, invoices issued outside KSeF may be challenged.
Yes. In offline24 mode you can issue invoices without KSeF connection. You must submit them to the system by the next business day.
KSeF access itself is free. The cost is integration software - from 0 PLN (Taxpayer App) to 30-200 PLN/month for professional solutions like Terminovo.
KSeF invoicing + AI debt collection in one. Start free and be ready for 2026.