I received the advanced child credit payments but where is the second half "payments" credit? When I entered the payment amount, my refund was deducted by that amount?

[xmasbaby0]

No--you just misunderstood the way the software displayed the calculations.   

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.

[MinhT1]

In fact, when you start your tax return, TurboTax will give you the full tax credit and include it in your refund. When you enter the advance payments you received, they are subtracted from your refund leaving you the correct balance of your child tax credit. The refund monitor only gives a temporary indication of your refund while you are entering information in your tax return. It is only final when have completed entering information on your tax return.

To check that the balance of the child tax credit is included in your refund, you can preview your form 1040 and check that the child tax credit is correctly calculated on line 28 of your form 1040.

Please preview your form 1040 by following these steps:

1. In TurboTax, open your return
2. In the left-hand column, locate Tax Tools, click on the drop-down arrow then click on Tools
3. On the Tools Center page, click on View Tax Summary
4. In the left-hand column, click on Preview my 1040
5. Your form 1040 will display.
6. Scroll down to line 28 - Refundable child tax credit or additional child tax credit from form 8812 and you should see the amount of this credit on this line.