law: Companies Act, 2013 
  49.
  
    Calls
  
  on shares of same class to be made on uniform basis.
  Where
  
  any calls for further share capital are made on the shares of a class, such
  
  calls shall be made on a uniform basis on all shares falling under that class.
  Explanation .—For the purposes of
  
  this section, shares of the same nominal value on which different amounts have
  
  been paid-up shall not be deemed to fall under the same class.