Interest on delayed service tax charged at stepped simple rates escalating with length of delay; notification fixes effective date. Fixes stepped simple interest rates for delayed payment of service tax, replacing the earlier notification. Interest is applied by reference to the duration of delay: a base rate for the first six months, a higher rate for delay beyond six months up to one year, and an additional higher rate for any delay beyond one year. The notification specifies its coming-into-force date and notes later supersession by a subsequent notification.