- G8 e M) _. y2 w+ j+ N / O( a) j5 c# R. NFrom February 21 to May 2, 2011, Individual income tax enquiries telephone agents are available Monday to Friday (except holidays) from 8:15 a.m. to 9:00 p.m. (local time) and from 9:00 a.m. to 5:00 p.m. on Saturdays (except Easter weekend) by calling 1-800-959-8281. Our automated service is available 24 hours a day, 7 days a week.