TurboTax has no knowledge whatsoever of your delinquent child support, nor does TT have any control over what happens with your tax refund after you file your tax return. As already stated, the IRS controls that. All TurboTax does is provide you with do-it-yourself software to prepare your tax return. The IRS controls what happens after you file it.
NOTE: 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
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**