According to an article in the Washington Post this week, the problem with receiving the wrong subsidy (tax credit) from the gov't stems from Americans who listed incomes on their insurance applications that differ significantly — either too low or too high — from those on file with the Internal Revenue Service. Consumers are notified if there is a problem with their application and asked to upload or mail in pay stubs or other proof of their income. Only a fraction have done so. And, even when they have, the federal computer system at the heart of the insurance marketplace cannot match this proof with the application because that capability has yet to be built, according to the three individuals. So piles of unprocessed “proof” documents are sitting in a federal contractor’s Kentucky office, and the government continues to pay insurance subsidies that may be too generous or too meager.    

http://www.washingtonpost.healthcare.subsidies may be wrong