You should have letter 6419
IF
you received any of the advance child tax credit payments which were sent between July and December. If you did not receive those payments you will not have a letter. If you are not sure whether you received CTC payments look at your bank account for deposits of $300 or $250 per child during those months or check your online IRS account.https://www.irs.gov/payments/your-online-account
Federal>Deductions and Credits>You and Your Family>Child Tax Credit
The IRS is sending out letter 6419 to you. It will show the amount of advance child tax credit that you received during 2021. Enter the information from that letter carefully.
The remaining amount of CTC that you can receive will show up on line 28 of your 2021 Form 1040. Then it will calculate down to the refund you see on line 35a or the tax due on line 37.
PREVIEW 1040
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.
NOTE: The CTC is indeed a “credit” that can be applied toward any tax liability that you would otherwise have to pay as “tax due” to the IRS.