{"id":5402,"date":"2026-04-06T17:21:18","date_gmt":"2026-04-06T15:21:18","guid":{"rendered":"https:\/\/clpodatki.pl\/?p=5402"},"modified":"2026-10-13T11:25:54","modified_gmt":"2026-10-13T09:25:54","slug":"ksef-phase-2-the-system-works-but-companies-have-problems","status":"publish","type":"post","link":"https:\/\/clpodatki.pl\/en\/ksef-phase-2-the-system-works-but-companies-have-problems\/","title":{"rendered":"KSeF Phase 2: The system works, but companies have problems"},"content":{"rendered":"<p><span dir=\"auto\">In an article for prawo.pl, Arkadiusz \u0141agowski shared his commentary on the entry into force of the second phase of the KSeF. As of April 1, 2026, the obligation to issue invoices through the KSeF applies to almost all businesses. How does this process work?<\/span><\/p>\n<p><span dir=\"auto\">In this article, Arkadiusz \u0141agowski <\/span><a href=\"https:\/\/www.prawo.pl\/podatki\/drugi-etap-ksef-system-dziala-ale-firmy-maja-szereg-problemow,1542019.html\" target=\"_blank\" rel=\"noopener\"><span dir=\"auto\">(https:\/\/www.prawo.pl\/podatki\/drugi-etap-ksef-system-dziala-ale-firmy-maja-szereg-problemow,1542019.html)<\/span><\/a><span dir=\"auto\"> \u00a0indicates that the system itself is working and does not detect any signals indicating system problems. However, he emphasizes that &#8220;problems resulting from the incompatibility of companies&#8217; accounting systems with the KSeF system remain.&#8221; It also happens that an invoice in the KSeF system has the status &#8220;accepted&#8221; but is not sent to the buyer or becomes invisible. These problems mainly result from incorrect integration of accounting systems with the KSeF system and from erroneous interpretation of API messages. They can also result from incorrect XML encoding of structured invoices and non-obvious errors in the invoice itself (e.g., providing the buyer&#8217;s VAT number instead of their Tax Identification Number). It still happens that the buyer receives the same invoice in KSeF and outside the system and must be careful not to record it twice (\u2026)\u201d.<\/span><\/p>\n<p><span dir=\"auto\">We encourage you to read the entire article, and if you have any questions about the operation of KSeF and how to adapt your company to operate safely with KSeF, please contact us.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Commentary by&nbsp;Arkadiusz \u0141agowski for the website prawo.pl.<\/p>\n","protected":false},"author":1,"featured_media":5403,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[329],"tags":[436,434,353,435,433],"ppma_author":[95],"class_list":["post-5402","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-law-firm-life","tag-accounting-systems-and-ksef","tag-api","tag-ksef","tag-ksef-from-1-april","tag-second-phase-of-ksef"],"acf":[],"authors":[{"term_id":95,"user_id":0,"is_guest":1,"slug":"arkadiusz_lagowski","display_name":"Arkadiusz \u0141agowski","avatar_url":{"url":"https:\/\/clpodatki.pl\/wp-content\/uploads\/2024\/12\/DSC_2314-scaled-e1751961533543.jpg","url2x":"https:\/\/clpodatki.pl\/wp-content\/uploads\/2024\/12\/DSC_2314-scaled-e1751961533543.jpg"},"author_category":"1","first_name":"Arkadiusz","last_name":"\u0141agowski","user_url":"https:\/\/pl.linkedin.com\/in\/arkadiusz-%C5%82agowski","job_title":"Doradca Podatkowy, Partner","description":"Tel.: +48 500 150 818"}],"_links":{"self":[{"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/posts\/5402","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/comments?post=5402"}],"version-history":[{"count":1,"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/posts\/5402\/revisions"}],"predecessor-version":[{"id":5404,"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/posts\/5402\/revisions\/5404"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/media\/5403"}],"wp:attachment":[{"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/media?parent=5402"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/categories?post=5402"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/tags?post=5402"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/clpodatki.pl\/en\/wp-json\/wp\/v2\/ppma_author?post=5402"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}