Poland Launches MCU Module for Managing KSeF Certificates and Authorisations Ahead of E-Invoicing Mandate

The Ministry of Finance has made available the Certificate and Authorizations Module in KSeF

The Certificates and Permissions Module (MCU), launched on November 1, 2023, enables users to manage permissions, apply for, and download certificates necessary for the KSeF system, with new permissions only available through MCU from November 1, 2025.
Certificates serve as electronic proof of identity, containing sensitive personal or company information, and must be kept secure to prevent unauthorized access, as they allow individuals to issue invoices on behalf of a company.
The Ministry of Finance offers technical support for MCU users through online forms and a dedicated hotline, emphasizing the importance of treating certificates with the same caution as sensitive banking information.

Source gov.pl

Poland’s Ministry of Finance launched the Certificates and Authorisations Module (MCU) in KSeF on 1 November 2025, allowing users to manage permissions, apply for, and download certificates.
The MCU is required for granting new authorisations from 1 November 2025; previous methods in KSeF 1.0 are no longer valid.
Mandatory use of the national e-invoicing system (KSeF) starts 1 February 2026 for large taxpayers and 1 April 2026 for others.
Certificates confirm identity and access rights in KSeF 2.0; companies must manage them securely and establish clear internal policies.
Technical support for MCU users is available weekdays via the KSeF application form.

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