Additional Child Tax Credit Use Part I of this schedule to document that any child for whom you entered an ITIN and for whom you also checked the "if qualifying child for child tax credit" box, is a resident of the United States because the child meets the substantial presence test and is not otherwise treated as a nonresident alien. Use Parts II–IV of Schedule 8812 to figure the additional child tax credit. The additional child tax credit may give you a refund even if you do not owe any tax.