Taxpayers eligible for the Earned Income Tax Credit for 2021 may also claim those funds if they file their returns for the year. Qualifying incomes are $21,430 for a single person without children or up to $57,414 for a married couple filing jointly with three or more qualifying children.

The IRS is warning the public that $1 billion in unclaimed 2021 tax refunds remain because about 1 million taxpayers haven't filed tax returns for that tax year as an April 15 deadline looms.