Step by step: How to gain access to KSeF for a limited liability company using a qualified electronic seal.

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Step by step: How to gain access to KSeF for a limited liability company using a qualified electronic seal.

folder Księgowość – Spółki person Igor Kyrczewski calendar_today 2026-01-17

A qualified electronic seal (containing the company's NIP) is the most convenient and fastest method of authentication for limited liability companies (sp. z o.o.). It allows for full online access without submitting the ZAW-FA form to the tax office. After authentication, the company receives initial ownership rights, and you can then grant access to employees or generate tokens for integration with accounting software. 

Prerequisite 

  • You must possess a valid qualified electronic seal with the company's NIP. If you don't have one, purchase it from a qualified provider (e.g., EuroCert, Certum, KIR). The cost is around 1000–1600 PLN, with a validity of usually 1–3 years.


Authentication steps in KSeF

  1. Access the KSeF Taxpayer Application Open the page: https://ksef.mf.gov.pl/web/login (or via the portal podatki.gov.pl/ksef).
  2. Select the login method Click the "Log in with a qualified certificate" option (the qualified seal is treated as a qualified certificate).
  3. Enter the authentication context In the "Identifier" field, select NIP and enter the company's NIP number. Click "Authenticate" or "Next."
  4. Download the authorization request The system will generate and allow you to download an XML file (authorization request). Save it on your computer.
  5. Sign the file with the qualified seal Use the seal provider's software (e.g., proCertum, Sigillum) to sign the file in XAdES format. The signed file will have a .xml or .xades extension.
  6. Upload the signed file Return to the KSeF application, click "Add file" or "Send back," select the signed file, and confirm.
  7. Confirmation of access After successful verification (usually immediate), you will be logged in with ownership rights. The company now has full access to KSeF – you can issue invoices, view them, and manage permissions.


What to do next after gaining access?

  • Grant permissions to employees: In the application, you can add individuals (logging in with a qualified signature or Trusted Profile) or generate tokens for integration with the accounting system.
  • KSeF Tokens: Used for automatic sending/receiving of invoices via API (e.g., in accounting software).
  • KSeF Certificates (starting February 1, 2026): Additional certificates for authentication in offline modes.


If you encounter problems (e.g., signature error), check the seal provider's instructions or the MF knowledge base: https://ksef.podatki.gov.pl/.
This method has been available since the implementation of KSeF 2.0 and has been operational in a production environment since 2026. Good luck!

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