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Despite “taxpayer confusion,” the inspector general said, the IRS should have caught the mistakes before forfeiting a potential billion dollars in revenue.

The General Business Credit also gives breaks to companies that install handicap-accessible additions such as ramps. Oversight for that part of the program was good, investigators said, and very little money was given to ineligible entities.

“However, despite the success of this criterion for identifying potentially erroneous claims, the IRS does not use this criterion to identify other questionable General Business Credit claims,” investigators said.

Once again, because of concerns that people could take advantage of the oversights, the inspector general did not say what action or program was so successful in stopping disability improvement payments but not in energy efficiency payments, and officials declined to give further information to The Washington Times.