If I have 2300 due to federal will that come out of the 4000 in child tax credit I have?

[xmasbaby0]

Look at your Form 1040.  If you are getting a refund it will be on line 35a.  If you owe tax due it will be on line 37.

Either of those lines will already include the calculations for the child tax credit.

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.

[Hal_Al]

Q. If I have $2300  federal tax calculated; will that come out of the 4000 in child tax credit I have?

A. Simple answer: Yes.

On form 1040, your taxable income is first calculated.  Then the tax is calculated on that. Then tax is reduced by any tax credits, including the child tax credit.  Tax "Due" comes after applying any credits and payment (e.g. withholding). 

If you had $2300 calculated tax, $2300 (of your maximum $4000) Child tax credit would reduce that tax to zero and you would have no tax due.  You may or may not get the remaining $1700 child tax credit, as a refund,  depending on how much earned income you have.