31 C.F.R. § 285.3
(a) Definitions. For purposes of this section:
Debt as used in this section is synonymous with the term past-due support unless otherwise indicated.
Debtor as used in this section means a person who owes past-due support.
Fiscal Service means the Bureau of the Fiscal Service, a bureau of the Department of the Treasury.
HHS means the Department of Health and Human Services, Office of Child Support Enforcement.
IRS means the Internal Revenue Service, a bureau of the Department of the Treasury.
Past-due support means the amount of support, determined under a court order, or an order of an administrative process established under State law, for support and maintenance of a child, or of a child and the parent with whom the child is living, which has not been paid, as defined in 42 U.S.C. 664(c).
State means the several States of the United States. The term “State” also includes the District of Columbia, American Samoa, Guam, the United States Virgin Islands, the Commonwealth of the Northern Mariana Islands, and the Commonwealth of Puerto Rico.
Tax refund offset means withholding or reducing a tax refund payment by an amount necessary to satisfy a debt owed by the payee(s) of a tax refund payment.
Tax refund payment means any overpayment of Federal taxes to be refunded to the person making the overpayment after the IRS makes the appropriate credits as provided in 26 U.S.C. 6402(a) and 26 CFR 6402-3(a)(6)(i) for any liabilities for any Federal tax on the part of the person who made the overpayment.
(b) General rule.
(c) Notification of past-due support—(1) Past-due support eligible for tax refund offset. Past-due support qualifies for tax refund offset if:
(i)
(4) Advance notification to debtor of intent to collect by tax refund offset. The State, or HHS if the State requests and HHS agrees, is required to provide a written notification to the debtor, pursuant to the provisions of 42 U.S.C. 664(a)(3) and 45 CFR 303.72(e), informing the debtor that the State intends to refer the debt for collection by tax refund offset. The notice also shall:
(d) Priorities for offset.
(1) As provided in 26 U.S.C. 6402, a tax refund payment shall be reduced in the following order of priority:
(e) Post-offset notice.
(1)
(i) Fiscal Service shall notify the debtor in writing of:
(m) Social Security numbers. Fiscal Service will ensure that an individual's Social Security number will not be visible on the outside of any package it sends by mail. In addition, Fiscal Service generally will redact or partially redact Social Security numbers in documents it sends by mail; however, to administer the tax refund offset program, Fiscal Service (and other disbursing officials) may include Social Security numbers in mailed documents, including, for example:
[63 FR 72094, Dec. 30, 1998, as amended at 72 FR 59480, Oct. 22, 2007; 74 FR 27433, June 10, 2009; 80 FR 81465, Dec. 30, 2015; 87 FR 50248, Aug. 16, 2022]