Earned income tax credits in the United States decrease taxes owed on a dollar-for-dollar basis. They’re attractive credits that many Americans take every year, but eligibility hinges on meeting strict requirements. Here’s what you need to know to see if you qualify.The first consideration is family size. Married couples with no eligible children receive a tax credit of $475. Families with one eligible child can receive a tax credit of $3,169; $5,236 for two children; and $5,891 for three kids. There is no larger tax credit for families with more than three children. To receive the earned income tax credit with no children, a single person’s annual income cannot exceed $13,980, and a married couple filing jointly must be below $19,190. With one child, single filers cannot earn more than $36,920; couples more than $42,130. For two children, single filers cannot earn more than $41,952; or $47,162 for couples. And for three, it’s no more than $45,060 for single filers and $50,270 for couples. Income limits can change yearly, so check with the IRS for the latest figures. Married couples must file jointly to be eligible for the tax credit. Filing separately disqualifies you from consideration.