Why the discrepancy? When we checked the similar claim by Axelrod, we spoke with Josh Gordon, policy director for the Concord Coalition. He said it has to do with how the two offices estimate the future. The CBO bases its projections on the assumption that the Bush tax cuts would expire in 2010 and that a patch to fix the alternative minimum tax would expire, among other things. The White House does not; instead, it assumes that nothing changes in current law.