New Certificates and Permissions Module (MCU) in KSeF – Taxpayer Application Discontinued
As of November 1, 2025, the Polish Ministry of Finance has launched the Certificates and Permissions Module (MCU) within the National e-Invoicing System (KSeF). This marks an important step in the digitalization of tax processes – from now on, new permissions can only be granted through the MCU, as the KSeF Taxpayer Application 1.0 has been discontinued.
What can you do in MCU?
Once logged in, users can:
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manage permissions within KSeF,
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apply for certificates required to use the system,
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download issued certificates.
What are KSeF certificates?
KSeF certificates are electronic proofs of identity that:
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contain personal or company data,
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allow the issuing and receiving of e-invoices on behalf of a business,
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are assigned exclusively to a specific individual (for personal certificates),
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or, in the case of organizations, are not tied to specific employees – the company is responsible for their proper use.
Important to know
Certificates and permissions issued via MCU will remain valid for KSeF 2.0, which will take effect on February 1, 2026.
The MCU also provides ownership-level permissions and permissions for persons listed in ZAW-FA notifications, enabling:
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management of permissions and subordinate units,
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review of granted permissions.
It may be necessary to reassign permissions in the MCU for individuals or other entities.
Why does it matter?
Since KSeF certificates and permissions involve sensitive identification data, companies should establish secure and compliant access management procedures.
A well-designed access control system is essential for a smooth and secure transition to KSeF 2.0.
Need assistance?
Our experts at Thedy & Partners can help your organization prepare for the transition to KSeF 2.0 and ensure compliance with the new digital requirements.
Contact: Łukasz Woźniak – lukasz.wozniak@thedy.pl