The amount taxpayers are paying has risen from £58.4 million to £73.8m, an increase of 26 % in a year.
Around four in every 10 decisions are overturned on appeal. Atos insisted it does not make decisions on whether or not people are fit to work, those are taken by the Department for Work and Pensions based on information it provides.
Yesterday shadow work and pensions secretary Liam Byrne said that Atos was a "disgrace" and should be stripped of the contract.
Labour MP Tom Greatrex, who has campaigned for reform for the past three years, said: "The British public are paying through the nose twice over for a failing system. £114m for the bungled tests, and another £74m to correct mistakes."