The interest to be charged on service tax collected but not deposited has been revised from May 14 2016. The new rates are: In case of assessees, with taxable services of more than 60lac who have collected service tax but not deposited is 24%pa and in other cases is 15%. In case of assessees having taxable services less then 60lac, who have collected the service tax but not deposited is 21% and in other cases is 12%1.