For example, say we have 3 children and received $900 monthly for 6 months. So, can I just input $5,400 next to my name and leave the blank next to hers blank, or do I need to wait for Form 6419?
You need to wait for forms 6419 which each of you should get and enter the amounts exactly as shown on the forms.
We got a form for each of us and the total amount was split evenly between us. we have two children that are ours together so if you have children that are only one persons child then it might differ in your situation so best to wait for the form in the mail though
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.
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.