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…
National e-Invoice System (KSeF) new integration libraries for JAVA and .NET We are very pleased to announce that we have made available two more client libraries for JAVA and .NET languages, which facilitate and accelerate the integration of systems with the National e-Invoice System. These are the next tools after the KSeF REST API interface and the PHP library that we make available Read more…
Part 1: The New Landscape of the National System for E-Invoices: A Strategic and Pragmatic Relaunch. The introduction of the National System for E-Invoices (KSeF) in Poland is undergoing a fundamental transformation. The initial vision of implementation, based on a "big-bang" model, has given way to a more flexible, phased, and consultative approach. This change is not merely a technical adjustment, but a strategic reset, forced by technological realities and dialogue. Read more…
The amendment to the VAT Act requires settlements using the National e-Invoice System. From February 1, 2026, the system will cover businesses in the country whose sales value of goods and services in the previous year exceeded PLN 200 million. As announced by the Ministry of Finance and in connection with the amendment to the legislation, Read more…
Business owners seeking new opportunities for expansion and increased revenue often decide to partner with foreign partners. However, when selling goods to customers outside of Poland, many questions arise regarding the correct settlement principles for such transactions. How do you properly account for VAT on foreign invoices? What obligations do these impose on companies? Read more…
The current KSeF 2.0 Implementation Plan in Poland – Deadlines, Requirements and Schedule Introduction: Understanding KSeF – What you need to know about the upcoming changes The National e-Invoice System, better known as KSeF, is a revolutionary change in the Polish tax system, introducing the obligation to issue and receive invoices in a structured electronic form via a central platform Read more…