New KSeF 2.0 ready for testing. The expert recommends caution

Since yesterday, entrepreneurs can check how the new National e-Invoice System 2.0 works. The Ministry of Finance has launched open tests of the KSeF 2.0 Taxpayer Application, providing entrepreneurs, accounting offices and software suppliers with a test environment.

– This is the first moment when entrepreneurs can actually see what everyday work with KSeF 2.0 will look like. It is worth spending a few hours on tests, especially on checking eligibility, issuing invoices in various modes and handling QR codes – says Piotr Juszczyk, Chief Tax Advisor at inFakt.

As the ministry emphasizes, this is a key stage of preparations for the launch of the production system, scheduled for February 1, 2026.

Open tests of the KSeF 2.0 Taxpayer Application

The Ministry of Finance has launched a test environment so that users can familiarize themselves with the functionalities of the new application. From November 3, 2025, you can:

• familiarize yourself with the provided software,

• test application functionalities in an unlimited way,

• report potential errors in the application.

– The new application is a fully refreshed interface that allows you to issue, receive and view invoices in the FA(3) structure – effective from February 2026. Users can test the process of issuing an invoice, searching for documents, downloading them in XML, HTML or PDF format, as well as using functions such as offline mode, support for dependent entities, tokens, certificates, QR codes and permissions management – explains Piotr Juszczyk.

The expert emphasizes that all activities performed in the test environment have no legal consequences, the data may be fictitious, and the documents are only for trial purposes.

– Personally, I recommend providing fictitious data, because our “tests” remain visible to others. So I advise caution, adds the tax expert.

What does the KSeF 2.0 Taxpayer Application enable?

The test version of the KSeF 2.0 Taxpayer Application enables, among others:

• issuing, receiving and viewing invoices (and corrections) consistent with the logical structure of FA(3),

• searching and downloading sent invoices in XML, HTML or PDF form,

• servicing dependent units (internal unit, subordinate unit of local government unit, member of the VAT group),

• support for complex identifiers (EU self-billing model),

• downloading the Official Confirmation of Receipt generated for an issued invoice or multiple invoices,

• viewing session history,

• support for QR codes, including access to an invoice using this code,

• generation and handling of tokens (until December 31, 2026),

• support for anonymous access to invoices,

• access to invoices issued offline,

• visualization and downloading of the PEF invoice,

• permissions management,

• applying for and downloading certificates.

How to start testing the KSeF 2.0 Taxpayer Application?

Participating in KSeF 2.0 tests is simple and does not require any formalities. Just go to the official website of the National e-Invoice System and select the “KSeF 2.0 Taxpayer Application – open tests” tab – the direct address of the test environment is https://web2te-ksef.mf.gov.pl/web/.

To log in, you can use a profile trusted by login.gov.pl or a qualified signature, as in the production version of the system. After logging in, the user gains access to all functionalities of the application – he can issue, receive and view e-invoices in test mode, without any legal consequences.