What is KSeF?

Overview

KSeF (Krajowy System e-Faktur) is Poland's National e-Invoice System — a centralized platform run by the Ministry of Finance for issuing, receiving, and archiving structured electronic invoices.

Key Features

KSeF allows businesses to:

• Issue invoices in the standardized FA(3) XML format
• Authenticate using qualified certificates or authorization tokens
• Track invoice transmission status in real time
• Maintain a legally compliant invoice archive

Why It Matters

From 2026, using KSeF becomes mandatory for B2B transactions in Poland. Every structured invoice will pass through KSeF, ensuring full transparency and standardization for all businesses.