20 July 2011
Dear Vipul, As far as my knowledge is concern, there is no such section in Companies Act 1956 which describes the Invoice or requirements pertaining to invoice.
However if you will refer the state vat acts or Service Tax Act (Finance Act 1994) or Central Excise Act 1944, you will find the requirement according to those acts. e.g. Excise invoice is goverened by Central Excise Act 1944 or Vat Invoice is governed by Stat Vat acts.