The Internal Revenue Service paid out over $572 million in excess Obamacare tax credits and sent incorrect forms to over half a million individuals due to a computer programming error, according a new government report.

The report released by the Treasury Inspector General for Tax Administration on Tuesday inspected the interim results of the IRS’s verification of Obamacare’s Premium Tax Credits, which were created to assist low or medium-income individuals and families to purchase health insurance in the marketplace.