He is a retired Deputy State Director of Customs, Selangor. Currently he is a Customs Consultant and lectures for customs and other logistics programmes. He joined Royal Malaysian Customs in 1973 as a superintendent and worked at various   divisions of the Department and held various positions. During the tenure of service, he had served Customs Division (Import & Export), Internal Tax Division (Sales Tax, Service Tax & Excise Duties), Preventive Division (State preventive & Special Squad HQ.)  and at Customs Computer Division. Perumal worked at various places such as Subang Airport, Johore Customs, Ipoh Inland Station, Customs HQ and Port Klang Customs. At Port Klang he headed the Import, Free Zone Division and Internal Tax division and then finally retired as Deputy State Director of Customs, Selangor.