Companies and shareholders: company takeovers: calculation of Stamp Duty - cash consideration
Where shares are transferred in the course of the takeover of a company, stamp duty is chargeable by reference to the amount or value of the consideration for the sale (FA99/SCH13PARA2). How this is determined will depend upon the form of consideration paid for the transfer.
Where consideration is paid in cash, the duty is calculated on the amount paid under the terms of the offer. For further details about cash consideration, see STSM021050.