The article explores how the National e-Invoice System (KSeF) can enhance tax control in Poland by providing officials with advanced capabilities for monitoring transactions. It highlights the necessity for tax authorities to familiarize themselves with this system, detailing how employees are being trained to effectively manage the influx of digital invoices and the best practices for utilizing the system’s infrastructure. Additionally, it mentions the different access levels to KSeF data that are established for various groups of officials, allowing for tailored approaches to data usage based on their specific needs. The piece further emphasizes the importance of strategic training and organizational solutions implemented to maximize KSeF's efficiency. The training initiatives cover a range of skills necessary for officials to navigate the new digital landscape and to leverage data analytics in their audits and investigations. This boosts their capability to identify discrepancies and enhance oversight in tax compliance efforts. By investing in such measures, Poland aims to streamline its tax processes and increase revenue over time. Ultimately, the integration of KSeF represents not just a technological shift but also a cultural change within the tax administration in Poland, fostering a more proactive and data-driven approach among officials. The article underscores that without proper implementation and awareness, the vast potential of KSeF may remain untapped, calling for ongoing support and adaptation in the system's adoption.