TurboTax does not know about your child support. There is no place on your tax return to enter anything about child support. If the IRS has that information it will be the IRS that offsets your refund and seizes your refund for the amount you owe.
refund offset.
https://www.irs.gov/uac/tax-refund-offsets-pay-unpaid-debts
IRS Treasury Offset Program Call Center at 1-800-304-3107
https://www.irs.gov/uac/tax-refund-offsets-pay-unpaid-debts
https://ttlc.intuit.com/community/refunds/help/what-is-a-refund-offset/00/26301
Reduced Refund https://www.irs.gov/taxtopics/tc203
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.**