Child Tax Credit at a Glance
A tax credit of up to $1,000 per qualifying child. If you claim the nonrefundable child tax credit but do not qualify for the full amount, you may also be able to take the refundable additional child tax credit. You must meet various criteria regarding the qualifying child.
Publication 17, Your Federal Income Tax - Chapter 34, Child Tax Credit - Essential guidance
Publication 972, Child Tax Credit - Detailed guidance