First day of KSeF: success, chaos, and reactions on social media

The first day of operation of the National e-Invoice System (KSeF) went down in history as an important step in the digitization of the Polish economy. Launched at midnight from January 31 to February 1, 2026, the system quickly processed tens of thousands of invoices, although there were initial difficulties. In this article, we summarize official data, entrepreneurs' reports, and lively discussions on social media.

Launch of KSeF: schedule and initial numbers

KSeF 2.0 started as planned by the Ministry of Finance. The obligation to issue e-invoices initially covered about 4.2 thousand of the largest companies, whose turnover in 2024 exceeded PLN 200 million. From February 1, all entities must receive invoices through the system, but in 2026 there are no penalties for errors.

By 10 a.m. on February 2, the system had received 720 thousand invoices, and 1.9 million people had authenticated themselves in it. KAS head Marcin Łoboda emphasized stability and the absence of security incidents. Deputy Minister Zbigniew Stawicki dismissed suggestions of a weak link in the form of employees, calling them misinformation. Earlier data from February 1 indicated over 50 thousand invoices and 320 thousand logins.

Official assurances: stability and no problems

The Ministry of Finance praised the system for its smooth start. "KSeF is an important step in the digitization of tax settlements, increasing security and streamlining company operations," reads the gov.pl statement. Roman Łożyński, Director of the IT Center, confirmed the absence of delays in official receipt confirmations and security incidents.

The further implementation schedule is clear:

• April 1, 2026: obligation for other companies (except the smallest).
• January 1, 2027: full coverage, including self-employed with turnovers up to PLN 10 thousand per month.

Technical issues: a time of learning and chaos

Despite officials' optimism, the first working day (Monday, February 2) brought challenges. Entrepreneurs reported difficulties with integration tools for issuing invoices. The Ministry of Digitization confirmed temporary login difficulties to the Trusted Profile due to high traffic. Alternative identification methods were recommended.

First-hand accounts confirm mixed experiences. A Business Insider reader, Mr. Marek, issued his first e-invoice after midnight – the process took him 30 minutes, surprising him with several interface elements. Programmer Łukasz Firek from Silesia praised the system for standardization: "Instead of invoices in email attachments – procedures and access control." Others complained about technical issues, predictable at the start. An expert warns: the coming weeks will be crucial.

What was written on social media?

Platforms like X (formerly Twitter) and LinkedIn were abuzz with comments. The hashtag #KSeF trended from the morning of February 2. Positive posts praised digitization: "Finally order in invoices!" wrote one entrepreneur. Large companies reported success: gas stations tested by businessmen issued e-invoices without problems.

Negative voices dominated among smaller entities: "Chaos during login, Trusted Profiles are down!" complained a user on X, quoted by the media. Others shared screenshots of errors in integrations with accounting software. Memes about the "first day of school" with KSeF as a new student circulated in Facebook accounting groups. The Ministry of Digitization actively responded, reassuring about the temporary nature of the glitches.

Discussion analysis shows a divide: big players (turnover > PLN 200 million) generally satisfied, small ones frustrated but understanding the lack of penalties in 2026.

Surprises and lessons from the first day

Mr. Marek from Business Insider was surprised by the complexity of the process: despite success, 30 minutes per invoice is a signal to improve UX. The system handled millions of authentications, indicating the scale of adoption. Experts emphasize: this is a time of learning. Businesses are testing KSeF at gas stations, stores – real scenarios.

1. High traffic: 1.9 million logins in a day.
2. Stability: No major failures.
3. Problems: Login via TP and integrations.

Summing up the first day: KSeF passed the test with a B+. Chaos is a natural stage of the digital revolution.

What's next for entrepreneurs?

The coming days are crucial – let's monitor the load. The Ministry of Finance guarantees no penalties, providing a buffer for adaptation. We recommend:

• Check integrations with accounting software.
• Use alternative login methods.
• Follow MF and KAS announcements.

KSeF is the future: safer, faster. Despite a turbulent start, Poland joins the European leaders in VAT digitization. Further implementation will show whether the system will win the hearts of businesses.