KSeF 2026: How to prepare for mandatory e-invoicing?

Starting February 1, 2026, for the largest entities, and from April 1, 2026, for all taxpayers, the National System of e-Invoices (KSeF) will become mandatory. This marks a significant transformation in invoicing practices, requiring thorough preparation.

During the webinar, experts from Forvis Mazars’ Tax Advisory and Innovation & Optimization Departments will explain the key aspects of mandatory e-invoicing.

Agenda

The following topics will be covered during the session:

• what e-invoices are,
• what KSeF is and how it operates,
• which transactions will be subject to mandatory e-invoicing,
• what penalties will apply for failing to issue e-invoices,
• what fields are included in the new FA-3 e-invoice schema and what to pay attention to when completing it,
• how to grant permissions for sending/receiving e-invoices via the KSeF platform,
• what steps to take to properly prepare for mandatory e-invoicing,
• what support Forvis Mazars offers for KSeF implementation.

Date: November 17, 2025
Time: 10:00–12:00 CET

The meeting will be conducted in English.