If I qualify for the $4000 child tax credit but the amount of credit i can take is limited to my tax liability of $308, How can I enter to get it?
You need to have taxable income to receive the child tax credit.
You may qualify for the "additional child tax credit" if you don't qualify for the normal credit of $2,000 per child.
You can see a summary of your tax return while in TurboTax by doing the following:
1. Find the "Tax Tools" option on your left menu bar and click on it
2. Click on "Tools"
3. Click on "View Tax Summary"
This will allow you to see if you have any income tax or credits.
These links will provide more information:
You cannot get the refundable additional child tax credit unless you have income from working. You say you are retired. There has only been one tax year in which you could get the full CTC without income from working. That was for 2021, but the tax laws changed for 2022 and 2023. Now you can only get the amount of credit that will reduce your tax liability to zero if you do not have income from working.