The function of and Addl.SP is to assist the Superintendent of police in their control of duties and supervision. An Addl. SP is usually in charge of a large urban area within a District or of the whole district, or is a Deputy Commandant of an Armed Police Battalion. Addl. SP can also be in charge of a subject matter area under a District SP, such as Administration, Traffic, Intelligence, Operations or Headquarters. In all appointments they report to the District SP or to the Commandant of the Battalion.[8]
IPS officers usually reach the rank of Addl. SP after 4 years of service, while State Police Service officers reach the rank after 7-12 years of service. If the SP is not in charge then the Addl.SP takes the responsibility over district.