KSeF and Microsoft Dynamics 365 Business Central – How to Prepare for the Upcoming Changes

The National e-Invoicing System (KSeF) is set to become mandatory for all VAT taxpayers in Poland—both active and exempt. Implementation will be phased depending on the size of the taxpayer:

• February 1, 2026 – for large taxpayers with 2024 sales exceeding PLN 200 million (including VAT)
• April 1, 2026 – for all other taxpayers
• January 1, 2027 – for taxpayers whose invoices are below PLN 450 and monthly sales don't exceed PLN 10,000 (VAT included)

This marks the most significant shift in the Polish tax and e-invoicing system in recent years.

For companies using ERP platforms like Microsoft Dynamics 365 Business Central, this change requires a careful review of current internal processes and technical infrastructure.

How to Prepare Your ERP System for KSeF?

1. Verify your taxpayer group and identify your applicable compliance deadline based on 2024 revenue.
2. Review and revise your invoicing workflows to align with KSeF requirements.
3. Appoint a KSeF administrator responsible for managing access and permissions.
4. Authorize your administrator via an electronic request (if using a qualified e-seal) or submit a ZAW-FA form in paper format.
5. Generate a token using the KSeF system – necessary for integrating Business Central. Note: This token is visible only once during generation.

What You Need to Know

• From February 1, 2026, most invoices must be issued and received exclusively through KSeF.
• You may still issue invoices to individuals outside KSeF until December 31, 2026.
• Invoices issued via fiscal registers (including paper) are allowed until the end of 2026.
• KSeF invoice numbers do not need to be included in payment transfers between active VAT taxpayers or when using Split Payment.

At oneDynamics, we closely track regulatory changes impacting ERP environments. We understand the operational and financial implications that KSeF introduces for businesses leveraging Microsoft Dynamics 365 Business Central.

Our mission is to ensure our clients and partners stay informed and prepared by sharing timely, clear, and actionable insights.

If you're using or planning to implement Business Central, follow our blog to receive expert guidance and regular updates on:

• KSeF implementation milestones
• ERP readiness and integration
• Best practices for compliance and automation

Let us help you make this transition with confidence 🚀