@medailytoday - If a Federal tax offset then contact the Bureau of Fiscal Services Toll Free: 800-304-3107 for information.
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If a state offset then contact the state taxing authority.
Most child support orders expire when the child turns 18, but can continue if the support is in arrears until the debt is paid off.
Whether he should be paying support at all is a legal issue, best discussed with an attorney (nobody here can offer legal advice).
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**