If all commercial and residential property sales above £250,000 were taxed where 1 per cent. was applied on the whole of the first £250,000, 3 per cent. on the excess consideration above £250,000 up to £500,000, and 4 per cent. on the excess consideration above £500,000, the reduction in revenue from stamp duty land tax is estimated at about £1.9 billion for the current financial year.