For the child tax credit, you may first want to check the dependent information that flows to Form 1040 U.S. Individual Income Tax Return to see how the information regarding the child is being reported. It is important that the child's data (such as social security number, year of birth, relationship, number of months lived with you, etc.) is entered correctly for the child tax credit to calculate.
To review or change the dependent information:
Your credit amounts are automatically calculated based on the dependent and income information you have entered.
To review your calculated child tax credit:
For additional information regarding the Child Tax Credit, please refer to IRS Instructions for Form 1040 and 1040-SR or IRS Publication 972 Child Tax Credit and Credit for Other Dependents.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.