- Starting January 1, 2026, businesses in Poland can attach supporting documents to structured invoices in the KSeF system.
- Attachments will be supported using the FA3 schema.
- Companies must notify the tax office via the e-Tax Office and ensure their software supports the new format.
- This feature helps document complex transactions with additional materials.
- Attachments carry cybersecurity considerations and require proper management.
- Businesses should update their software to comply with the FA3 standard.
- Companies need to submit notification to the tax office if they plan to use attachments.
- Monitor the Ministry of Finance’s website for technical documentation expected in the second half of 2025.
- InsERT software users are already supported and expected to be compatible with new requirements.
- Companies should review systems and plan for compliance before the 2026 deadline.
Source: fiscal-requirements.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.
