Cause I found this article on the irs website:
Topic 203 - Failure to Pay Child Support, Federal Non-Tax Debts, State Income Tax Obligations and Unemployment Compensation Debts
The Department of Treasury's Financial Management Service (FMS), which issues IRS tax refunds, has been authorized by Congress to conduct the Treasury Offset Program. Through this program, your refund or overpayment may be reduced by FMS and offset to pay any past-due child support, Federal agency non-tax debts, state income tax obligations or certain unemployment compensation debts owed a state (namely debts for compensation that was paid due to fraud or for contributions due to a state fund that were not paid due to fraud).
You can contact the agency with which you have a debt, to determine if your debt was submitted for a tax refund offset. You may call FMS at the number below for an agency address and phone number. If your debt was submitted for offset, FMS will take as much of your refund as is needed to pay off the debt and send it to the agency you owe. Any portion of your refund remaining after offset will be issued in a check to you or direct deposited for you.
FMS will send you a notice if an offset occurs. The notice will reflect the original refund amount, your offset amount, the agency receiving the payment, and the address and telephone number of the agency. FMS will notify the IRS of the amount taken from your refund. Contact the agency shown on the notice if you believe you do not owe the debt or you are disputing the amount taken from your refund. If a notice is not received contact FMS at XXX-XXX-XXXX or TDD XXX-XXX-XXXX. The available hours are Monday through Friday 7:30AM to 5:00PM CT. Contact the IRS only if your original refund amount shown on the FMS offset notice differs from the refund amount shown on your tax return