UPDATE: Effective for 2018, the new tax laws temporarily increase the child tax credit to $2,000 per qualifying child and provide a $500 non-refundable credit for qualifying dependents other than qualifying children. The maximum amount refundable for the child tax credit is $1,400 per qualifying child.
This is a significant increase and change, as before the child tax credit maxed out at $1,000 and there was no credit for qualifying dependents.
-Christopher Olson, EA