You already received one-half of the child tax credit, $1,500, as an advance in 2021. So on the 2021 tax return you can only receive $1,500 of $3,000 child tax credit.
The Child Tax Credit is entered on your federal tax return Form 1040 on Line 28. It is added to your other tax payments, it is not a separate refund. Your Total taxes from Line 24 are subtracted from your Total tax payments on Line 33. If you have an overpayment then that is entered on Line 34 as your federal tax refund.
