KSeF

Connecting your business to the National e-Invoicing System, permissions, certificates, and sending invoices.

• How to connect your business to KSeFFrom granting permissions in KSeF to the first invoice sent from Atestio — the order of steps, and what to do if one fails.
• Ways to connect to KSeFToken, certificate, or Profil Zaufany — how to set up each method, and how to switch methods later.
• Purchase invoices from KSeFHow Atestio synchronizes invoices issued to the taxpayer's NIP, how to review them, and what actions are available.
• KSeF number, QR code, and visualization — what's bindingWhat a KSeF number is, what the QR code on a printed invoice is for, and which document is legally binding.
• When KSeF is unavailableWhat Atestio does when the Ministry of Finance's system is temporarily unavailable, and what the offline mode set out in the VAT Act is.
• TroubleshootingA rejected invoice, KSeF authentication errors, a forgotten password — what to do in each situation.