Justin and Louise have two children, ages 12 and 10. Their modified AGI is $120,500. What is their child tax credit? Solution Child tax credit is $1,000 per one child who is a qualifying child. Here, both the children are qualifying childs, thus, the credit can be taken is $1000 * 2 = $2,000 as child tax credit. Therefore, the child tax credit is $2,000..