Actually the rules are different for ONLY 2021---a child who is not 18 by the end of 2021 gets the child tax credit. If she was younger than 18 at the end of 2021--good news--- you get the child tax credit. It will show up on line 28 of your Form 1040
A3. For tax year 2021, a qualifying child is an individual who does not turn 18 before January 1, 2022, and who satisfies the following conditions:
- The individual is the taxpayer’s son, daughter, stepchild, eligible foster child, brother, sister, stepbrother, stepsister, half-brother, half-sister, or a descendant of any of them (for example, a grandchild, niece, or nephew).
- The individual does not provide more than one-half of his or her own support during 2021.
- The individual lives with the taxpayer for more than one-half of tax year 2021. For exceptions to this requirement, see IRS Publication 972, Child Tax Credit and Credit for Other Dependents PDF.
- The individual is properly claimed as the taxpayer’s dependent. For more information about how to properly claim an individual as a dependent, see IRS Publication 501, Dependents, Standard Deduction, and Filing Information. PDF
- The individual does not file a joint return with the individual’s spouse for tax year 2021 or files it only to claim a refund of withheld income tax or estimated tax paid.
- The individual was a U.S. citizen, U.S. national, or U.S. resident alien. For more information on this condition, see IRS Publication 519, U.S. Tax Guide for Aliens.
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