law: Indian Stamp Act, 1899 
  28. Direction as to duty in case of certain conveyances 
  (1) When any property has been contracted to be sold for one
  
  consideration for the whole, and is conveyed to the purchaser in separate parts
  
  by different instruments, the consideration shall be apportioned in such manner
  
  as the parties think fit, provided that a distinct consideration for each
  
  separate part is set forth in the conveyance relating thereto, and such
  
  conveyance shall be chargeable with ad valorem duty in respect of such distinct
  
  consideration.
  (2) Where property contracted to be purchased for one
  
  consideration for the whole, by two or more persons jointly, or by any person
  
  for himself and others, or wholly for others, is conveyed in parts by separate
  
  instruments to the persons by or for whom the same was purchased, for distinct
  
  parts of the consideration, the conveyance of each separate part shall be
  
  chargeable with ad valorem duty in respect of the distinct part of the
  
  consideration therein specified.
  (3) Where a person, having contracted for the purchase of any
  
  property but not having obtained a conveyance thereof, contracts to sell the
  
  same to any other person and the property is in consequence conveyed
  
  immediately to the sub-purchaser, the conveyance shall be chargeable with ad
  
  valorem duty in respect of the consideration for the sale by the original
  
  purchaser to the sub-purchaser.
  (4) Where a person, having contracted for the purchase of any
  
  property but not having obtained a conveyance thereof, contracts to sell the
  
  whole, or any part thereof, to any other person or persons and the property is
  
  in consequence conveyed by the original seller to different persons in parts,
  
  the conveyance of each part sold to a sub-purchaser shall be chargeable with ad
  
  valorem duty in respect only of the consideration paid by such sub-purchaser,
  
  without regard to the amount or value of the original consideration, and the
  
  conveyance of the residue (if any) of such property to the original purchaser
  
  shall be chargeable with ad valorem duty in respect only of the excess of the
  
  original consideration over the aggregate of the considerations paid by the
  
  sub-purchasers:
  PROVIDED  that the duty on such last-mentioned
  
  conveyance shall in no case be less than one rupee.
  (5) Where a sub-purchaser takes an actual conveyance of the
  
  interest of the person immediately selling to him, which is chargeable with ad
  
  valorem duty in respect of the consideration paid by him and is duly stamped
  
  accordingly, any conveyance to be afterwards made to him of the same property
  
  by the original seller shall be chargeable with a duty equal to that which
  
  would be chargeable on a conveyance for the consideration obtained by such
  
  original seller, or, where such duty would exceed five rupees, with a duty of
  
  five rupees.