AAR has three branches -- the principal branch in Delhi, the National Capital Region (NCR) branch in Delhi and one in Mumbai. Under the statute, the AAR consists of a chairman and such number of members (vice-chairman, revenue members, and law members) as the government may notify. The posts of chairman and vice-chairman have to exist for AAR to function. However, both posts have been lying vacant since last year, leaving the body non-functional, said Ashutosh Dikshit, partner Deloitte India and author of the report cited above. Dikshit said if the chairman is there, he can appoint a vice-chairman from among the members. However, the chairman has to be there to make the institution functional, he said.