The Internal Revenue Service recently completed corrections on some 14 million 2021 tax returns leading some 12 million additional refunds, the tax agency said.

Many of the refunds come from a change in the way unemployment insurance was taxed. The American Rescue Plan of 2021, which became law in March 2021, excluded up to $10,200 in 2020 unemployment compensation from taxable income. The exclusion applied to individuals and married couples with modified adjusted gross income of less than $150,000.

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The issue arose, however, of those who filed taxes prior to the plan’ passage leading to them overpaying on jobless benefits they received in 2020. As a result, the IRS said it would review returns filed prior to the law’s passage to identify those who reported unemployment compensation and were eligible for a correction.

Other corrections included adjustments due to the Earned Income Tax Credit, Recovery Rebate Credit, Additional Child Tax Credit, American Opportunity Tax Credit, Premium Tax Credit, ad Advance Premium Tax Credit.

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The IRS said it has corrected some 14 million returns, resulting in 12 million refunds totaling $14.8 billion. The average refund was $1,232.

Affected taxpayers have received letters advising them of the corrections and are advised to keep it with their tax information.