Is your company prepared for Poland’s mandatory B2B e-invoicing transition? Starting February 2026, large enterprises must issue electronic invoices exclusively—followed by a full nationwide rollout by April 2026. This guide breaks down everything you need to know about Poland's phased approach, from key compliance dates to actionable steps for a seamless transition.

Poland is implementing a new mandate for mandatory B2B e-invoicing. The system, KSeF, is a central platform for issuing, receiving, and storing electronic invoices, designed to enhance tax collection and digitalize Poland’s tax system.

Timeline:

1st February 2026: Mandatory e-invoicing for enterprises with annual revenue exceeding 200 million PLN.

1st April 2026: Mandatory B2B e-invoicing for all enterprises in Poland.

This initiative aligns with the EU ViDA’s plan to mandate the exchange and reporting of e-invoices by July 2030.

 

 

2026: Mandatory B2B E-invoicing Poland

Poland’s new e-invoicing regulation will be implemented in two phases, but the requirements remain the same:

From 1st February 2026, the regulation applies to enterprises with annual revenue exceeding 200 million PLN.

From 1st April 2026, it applies to all enterprises in Poland.

Poland is mandating electronic invoicing for most domestic B2B transactions, requiring invoices to be issued and received through the KSeF platform. Each invoice will be assigned a unique identifier and must be in a structured XML format, making the data machine-readable and automatically processable.

What Do You Need to Do?

Prepare Your Systems

Create a KSeF Account

Data Capture

Invoice Storage

 

 

Present Regulations

Currently, only B2G transactions are mandated to use e-invoicing in Poland. B2B and B2C e-invoicing remain voluntary, allowing businesses time to adapt and prepare for the upcoming mandates.

Click here for a complete Invoicing Guide for Poland.

 

 

Looking For Compliant Polish E-invoicing Supplier?

With Space Invoices, you can rely on a single API for global invoicing compliance, including both current and future Polish regulations. Our API simplifies e-invoicing processes, saving you time, cutting costs, and eliminating manual errors. Instead of spending valuable time on invoicing, let us handle it for you—while giving you the opportunity to earn invoicing revenue.

For more details on our API and compliance capabilities, click here or contact us.

 

This guide is for informational purposes only, as regulations and timelines can change frequently. While we strive to monitor updates and maintain the accuracy of our content, we recommend consulting with a tax professional or e-invoicing specialist for the most reliable and personalized advice. This content was last updated on January 8, 2025.

Additional reading:

• 2030 Intra Community E-invoicing Mandatory EU ViDA
• 3 Best White-Label Invoicing APIs for B2B SaaS, Fintech, and Neobank Platforms
• Ask Your Developer: Key Insights for the Build vs Buy Debate in Invoicing API