15 U.S.C. § 1673: Restriction on garnishment

25 per centum of his disposable earnings for that week, or the amount by which his disposable earnings for that week exceed thirty times the Federal minimum hourly wage prescribed by section 206(a)(1) of title 29 in effect at the time the earnings are payable, any order for the support of any person issued by a court of competent jurisdiction or in accordance with an administrative procedure, which is established by State law, which affords substantial due process, and which is subject to judicial review. any order of any court of the United States having jurisdiction over cases under chapter 13 of title 11. any debt due for any State or Federal tax. where such individual is supporting his spouse or dependent child (other than a spouse or child with respect to whose support such order is used), 50 per centum of such individual’s disposable earnings for that week; and where such individual is not supporting such a spouse or dependent child described in clause (A), 60 per centum of such individual’s disposable earnings for that week; No court of the United States or any State, and no State (or officer or agency thereof), may make, execute, or enforce any order or process in violation of this section.