As the new regulations requiring the use of the National e-Invoice System (KSEF) approach, entrepreneurs are facing numerous concerns. Concerns expressed by business owners include adapting their company software to the new requirements and the security of data transferred to the government's KSeF IT system. What data is stored in the system? Read more…
Standardized invoices are those in XML format and stored electronically. A PDF file is generated when the document needs to be read, and KSeF has introduced a new requirement to mark invoice visualizations with QR codes. This code allows for easy verification that the document was generated in KSeF and that all information is correct. Read more…
As of February 1, 2026, many companies will be required to issue structured invoices through the National e-Invoice System. Implementing KSeF in a company comes with many challenges, one of which is the authorization process using KSeF certificates. Learn what a KSeF certificate is, what it's used for, and how to obtain it. Read more…
The National System for E-Invoices (KSeF) is a hot topic in 2025. Many businesses are looking for reliable information, as the Ministry of Finance has changed the guidelines for this solution several times, including postponing the effective date of the KSeF regulations. The following guide is a compendium of knowledge about the KSeF, presenting the status as of July 2025 – we invite you to read it. Read more…
Need intuitive and functional business software? Then learn more about the software offered by the third-party provider KSeF API. It's a good alternative to the official National e-Invoice System. What can you gain by using ready-made libraries, full documentation, and integration via XML and XSD files? Learn more and learn more. Read more…
Using the advanced KSeF API software offers virtually unlimited integration possibilities. You can tailor it to your organization's needs, ensuring implementation won't generate unnecessary monthly costs. What licensing methods are available for using the KSeF REST API system? Learn more! Basic license types for REST integration. Read more…
As of February 1, 2026, many companies will be required to issue structured invoices and use the National E-Invoice System – and subsequent entities will be required to do so from April 1, 2026. At the same time, implementing the KSeF system poses many challenges. A way to avoid problems during the KSeF integration process Read more…
Implementing the National e-Invoice System (KSeF) is one of the biggest technological challenges facing Polish companies today. The complexity of the official API, limited access to documentation, and lack of efficient technical support are forcing many organizations to rely on the services of investors. One of the leaders in this field is ksefapi.pl, a solution that Read more…
The introduction of the mandatory National e-Invoice System (KSeF) is a revolution in the circulation of financial documents in Poland. Companies are therefore faced with a challenge: how can they integrate with KSeF quickly, safely, and as seamlessly as possible, without wasting valuable resources and IT team time? Ksefapi.pl comes to the rescue—a comprehensive and modern integration tool that Read more…
An invoice correction note is a document that allows you to correct minor errors on a sales invoice without having to issue a correction invoice. When can it be used and who is authorized to do so? Read this article to learn the rules and avoid errors that may have tax consequences. What is an invoice correction note? Read more…