TurboTax is saying I am due a child tax credit of $3500 for 2021 for one child, but it should be $3000 based on the age of my child (over age 6). How do I correct this?

[xmasbaby0]

Check the date of birth you entered in My Info for your child.   If your child was under the age of 6 at the end of 2021 the CTC is $3600.   If the child was 6 or older at the end of 2021 then the CTC is $3000.

[CrazyRay515]

Child's DOB is correct (2009), their calculation is showing the wrong amount.

[CrazyRay515]

Child's DOB is correct (2009), their calculation is wrong.

[xmasbaby0]

What line on your Form 1040 is showing $3500?   What is on line 28?

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.

[CrazyRay515]

We received $1,186 payments, line 28 shows 1,814 = comes to $3k which would be correct I think? 

[xmasbaby0]

Yes that is correct.   Your grand total for the child tax credit for your child born in 2009 is $3000.   You got almost half of it during the months between July and December and you got the rest of the $3000 on line 28 of your tax return.   If your total refund on line 35a is more then you are getting a refund for something else as well--like tax withheld or some other refundable credit.  

You still have not said where or on what line you saw $3500 so we can only make guesses about that.