Many individuals will qualify for tax credits to purchase the required health insurance from the health insurance marketplace in 2014. The Internal Revenue Service is responsible for calculating the tax credits accurately.
The IRS will use a software program to verify tax credit calculations and assess penalties prior to issuing them to health insurers. However, there is concern about fraud because the agency has not completed a fraud mitigation strategy to prevent people that underestimate their incomes from fraudulently collecting health subsidies. As currently established, the IRS would issue the tax credits prior to verifying income.
The IRS has outlined tax provisions related to the Affordable Care Act here.
The report from the Treasury Inspector General for Tax Administration is available here.