This community service activity aimed to assist Mall SKA employees in understanding the use of the Coretax DJP system and the process of reporting Individual Annual Tax Returns. The activity was conducted in the HRD Room on the 5th floor of Mall SKA by the Tax Center of Universitas Muhammadiyah Riau through the Relawan Pajak Untuk Negeri (Renjani) program. The implementation methods included material presentation, assistance with Coretax account registration and activation, assistance in applying for electronic certificates or DJP authorization codes, as well as guidance in completing and submitting Individual Annual Tax Returns electronically. The results showed that several participants still experienced difficulties in using the Coretax DJP system, especially during account registration, account activation, and online tax reporting procedures. Through direct assistance, participants were able to better understand the stages of using digital tax services. In addition, participants gained a better understanding of the importance of electronic tax reporting and digital tax administration. This activity indicates that tax education and assistance are still needed to help taxpayers adapt to digital tax administration systems and improve their understanding in carrying out tax obligations properly and correctly.