A child tax credit is a nonrefundable credit for the amount of $2,000 can be claimed on each qualified child, in turn it can reduce tax. A citizen or resident alien child having SSN will get you a credit of $2,000 and a child with Individual taxpayer identification number (ITIN) will get you a credit of $500. Maximum allowable age for a child. The refundable tax credit you can receive ranges from a maximum of $6,728 if you have three or more children, to $1,502 if you have no children for tax year 2021. Unlike some other tax.