Eligibility for Child Tax Credit by Age of Child

The child tax credit is the largest federal cash assistance program for children. In 2007, tax filers can claim a credit equal to 15 percent of the excess of earnings over $11,750, up to the $1,000 per child. Authors find that among working families, more than 30 percent of qualifying children under age 2 are in families with earnings too low to qualify for the full credit.