- Poland’s national e-invoicing system (KSeF) becomes mandatory from 1st February, starting with large taxpayers, and will be phased in for others.
- Invoices must be issued in a structured format and transmitted through KSeF before sharing with customers, enabling real-time tax reporting and increased transparency.
- Key deadlines: 1st February (large taxpayers), 1st April (other taxpayers), 1st August (bank transfer ID required), January 2027 (micro businesses, additional requirements, and penalties).
- No monetary penalties for certain breaches during 2026 if due to technical or integration issues, but other fiscal penalties still apply.
- Greece allows parallel use of old and new systems until March 2026, with non-compliance risking invoice rejection or payment delays.
Source: innovatetax.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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