Will my refund automatically go to my back child support?

[xmasbaby0]

TurboTax has no information about your back child support or whether there is an order in place to seize your refund to pay that child support.  You can check here:

You can contact the IRS Treasury Offset Program Call Center at 1-800-304-3107 to ask if they have an offset for you on file. TurboTax would not have that information.

https://turbotax.intuit.com/tax-tips/tax-payments/who-can-garnish-an-income-tax-refund/L7cPPzDyc

If the IRS offsets your refund for the child support you owe, then you will receive a letter of explanation from the IRS.