The prospect of a Labour government is knocking up to 10 per cent off the price of some of Britain 's most expensive homes , it has been claimed . Wealthy buyers are demanding a lower 'Ed Miliband ' price to compensate for any future mansion tax bills introduced by the Labour leader if he becomes Prime Minister . Estate agents in London are now said to be offering a higher 'Cameron price ' and lower 'Miliband price ' for the same property . Labour leader Ed Miliband , on the BBC 's Andrew Marr show ( left ) , has pledged to introduce a mansion tax on properties worth over £2million . The annual levy will hit his own home in north London ( right ) Mr Miliband has pledged to introduce an annual levy on homes worth more than £2million to raise money for the NHS . Under plans drawn up by shadow chancellor Ed Balls , homeowners with properties worth between £2million and £3million will be forced to pay £3,000 a year in mansion tax . Owners of homes worth more than £3million will have to pay even more . The Tories have dubbed the proposal the 'homes tax ' and warned that families living in much more modest properties could be dragged into the levy . Mr Milliband himself has admitted that his North London home would be hit by his party 's planned annual levy . David Cameron , on Sky 's Murnaghan show this morning , has criticised Labour 's proposed mansion tax as a 'home tax ' A Labour government could see people 's mortgage bills soar by £1,000 a year , George Osborne has claimed . The Chancellor warned warned that the prospect of Ed Miliband propped up by the SNP would lead to a 'clear and present danger ' of rising interest rates . Predicting increases in mortgage rates , he said : ' A 1 % rise in interest rates would hit the family with the average mortgage with an extra £1,000 bill a year . The price is paid by working people . ' The Labour leader lives in a four-bedroom semi-detached house in Dartmouth Park valued at around £2.7million . But if Mr Miliband ever came to sell his home as Prime Minister he could be forced to lower the price to cover the costs of his own mansion tax . According to the Sunday Times , one buyer who is about to exchange contracts on a £15million property in St John 's Wood , north London , has threatened to drop his offer to £13.5million if the deal is not completed before May 7 and Mr Miliband becomes Prime Minister . In Notting Hill , west London , a buyer of a property for sale just above £2million has said he will only pay that price only if David Cameron makes it back to Number 10 . Miles Meacock , of Strutt & Parker , the estate agent , in Notting Hill , told the Sunday Times that the bidder who had trimmed £100,000 from their offer for a £2m property , wanted to be sure of permanently avoiding the burden of mansion tax . He said : 'If the Tories win , he will come back to the table . This is likely to be a phenomenon for the next two weeks . ' According to the property website Rightmove 77 homes previously listed for sale above £2million have been reduced to below the 'mansion tax level ' in the past six weeks . Ed Mead , an executive director at the London estate agent Douglas & Gordon , some sellers are so concerned about the mansion tax putting off potential buyers that they have told prospective buyers they will cover the full cost of it for a five-year Labour term . The Liberal Democrats have a similar mansion tax proposal . Nick Clegg wants to charge £2,000 a year on properties worth between £2million and £2.5million , rising to £3,500 for those worth between £2.5million and £3million , £5,000 for £3million to £4million and £9,000 for those worth up to £5million .
Estate agents are offering a 'Cameron price ' and a lower 'Miliband price ' Labour will introduce an annual levy on homes worth more than £2million . The prospect is alarming wealthy buyers who are demanding a discount . Some buyers are waiting until after the election to complete purchases .