Deductions & credits

Print all forms and worksheets if you are using the online version or switch to the forms mode if using desktop version.

Look at the "Child tax credit" worksheet lines 1 & 2.    If the $500 is on line 1 then you mist have made a data entry error somewhere. Line 1 would only have a value of child was under age 17.  I would suggest deleting the dependent and re-enter.

If the $500 is on line 2, as it should be for dependents over age 16 , then this is an IRS error.