The earned income tax credit offers up to $6,660 for qualified filers—yet too many Americans don’t seem to know about it. While 25 million Americans qualify, the IRS says that only 20% of them claim the credit on their federal tax return. Here’s a look at why and whether you’re leaving cash on the table. Advertisement How does the earned income tax credit work? The earned income tax credit (EITC) is primarily designed to provide financial assistance to working families with children. For the tax year 2020, filers can qualify for: A $6,660 credit if you make less than $56,844 and have three kids.