- From January 1, 2026, the Ministry of Finance enables taxpayers to register their intention to issue and send invoices with attachments to KSeF 2.0 via the e-Tax Office.
- Registration is required before issuing such invoices; processing takes up to 3 business days, and confirmation is sent by email.
- Both individuals and organizations with a NIP can submit registrations; organizations must use an authorized user.
- Attachments must be part of the invoice XML file and contain only tax-related or strictly related data—marketing or unrelated documents are not allowed.
- Taxpayers can also register to stop issuing invoices with attachments; the process and requirements are similar.
Source: gov.pl
Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.
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