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CNKP is not only advisory, accounting and auditing services. We pay particular attention to expanding and updating our knowledge and following all industry news. For this reason, we regularly organize training meetings with our clients, during which we are happy to share our knowledge and skills. The same purpose is served by our legal and tax alerts and newsletters.

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## [Mandatory KSeF – New E-Invoicing Rules in Poland from 2026](https://cnkp.pl/en/blog-en/alerty-2/mandatory-ksef-new-e-invoicing-rules-in-poland-from-2026)

[Marcin Kowalski](https://cnkp.pl/en/blog-en/author/marcin-kowalski) [Tomasz Mróz](https://cnkp.pl/en/blog-en/author/tomasz-mroz) 3 September 2025 [Alerts](https://cnkp.pl/en/blog-en/alerty-2)

On August 27, 2025, the President of Poland signed into law an amendment to the VAT Act, introducing new deadlines for the implementation of the National e-Invoicing System (KSeF). This centralized platform will transform how invoices are issued, processed, and stored, with a phased rollout affecting most VAT taxpayers. Businesses of all sizes are required to prepare in advance by adapting IT systems, training teams, and securing the necessary certificates to ensure compliance and smooth integration with KSeF.

[Read More](https://cnkp.pl/en/blog-en/alerty-2/mandatory-ksef-new-e-invoicing-rules-in-poland-from-2026)