This study aims to analyze the implementation of Coretax and its impact on the ease of using tax services for corporate taxpayers at PT. Prima Konstruksi. This research employed a qualitative approach using a phenomenological method to explore users' experiences in implementing the digital tax administration system. Data were collected through observations, in-depth interviews, and documentation involving informants directly engaged in the company's tax administration activities. The findings indicate that the implementation of Coretax significantly improves the ease of tax administration by integrating various tax services into a single digital platform. The system enhances reporting efficiency, accelerates administrative processes, minimizes data entry errors, and facilitates monitoring of corporate tax obligations. Furthermore, Coretax reduces dependence on multiple tax applications previously used separately. However, several challenges were identified during the early implementation stage, including server disruptions, system adjustments, and the need for user adaptation to the new procedures. Overall, the implementation of Coretax has positively influenced the ease of tax services and has the potential to improve corporate taxpayer compliance.
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