- From January 1, 2026, Polish businesses must notify the tax authority before sending invoices with attachments via KSeF 2.0.
- Notification is required both to start and stop sending attachments, and approval (up to 3 working days) is needed before attachments are allowed.
- Only tax-related information is permitted in attachments; marketing or non-tax documents are prohibited.
- Notification is done online through the e-Tax Office, requiring business details, activity type, technical parameters, and purpose.
- Sending prohibited content may result in losing the right to use attachments in KSeF 2.0.
Source: taxilla.com
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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