This study evaluated the extent of use and the degree of effectiveness of the e-appointment system of the Bureau of Internal Revenue (BIR) in Aklan. Specifically, it aimed to identify the demographic profile of taxpayers and examine the relationship between the extent of use and the degree of effectiveness of the system. The study involved 105 taxpayers with booked appointments at Revenue District Office No. 71 in Aklan, selected through quota sampling. The findings revealed that the majority of taxpayers were female, employed in either the private or government sector, earning between Php 20,001.00 and Php 40,000.00, mostly college graduates residing in Kalibo. The extent of use of the BIR’s e-appointment system was rated as high in terms of users’ available resources. Similarly, the degree of effectiveness was rated as effective in relation to those same resources. Furthermore, using Spearman’s rho correlation coefficient, the analysis showed no strong evidence of a significant relationship between the extent of use and the degree of effectiveness of the system. Therefore, the BIR is encouraged to implement necessary interventions to continuously improve the system, make it more user-friendly, and conduct regular feedback sessions with taxpayers to enhance usability, satisfaction, and overall system efficiency.