
377 S.E.2d 88 (1989)
SAMPSON COUNTY CHILD SUPPORT ENFORCEMENT AGENCY, ex rel. Mary Hester BOLTON, Plaintiff-Appellee,
v.
Albert BOLTON, Jr., Defendant-Appellant.
No. 884DC609.
Court of Appeals of North Carolina.
March 7, 1989.
*90 Atty. Gen. Lacy H. Thornburg by Asst. Atty. Gen. T. Byron Smith, Raleigh, for the State plaintiff-appellee.
East Cent. Community Legal Services by Leonard G. Green and James P. Green, Jr., Smithfield, for defendant-appellant.
ARNOLD, Judge.
Defendant contends that the hearing provided under N.C.G.S. § 110.136.4 for contesting wage garnishment fails to comport with due process requirements under the federal and North Carolina Constitutions. We disagree. Rather, we find that plaintiff Sampson County Child Support Enforcement Agency proceeded wrongly under North Carolina's statutory scheme for income withholding in IV-D cases by attempting to use the garnishment proceeding outlined in N.C.G.S. § 110.136.4 as a means to modify the underlying order which established the rate at which the defendant could be assessed for arrearages.
Defendant also contends that the notice provisions of N.C.G.S. § 110.136.4 are contrary to the federal statute which are the basis for wage garnishment proceedings and therefore invalid under the Supremacy clause. We take up this argument first, and then proceed to defendant's due process argument.
Federal law requires states to implement procedures for income withholding as a method of enforcing child support orders. 42 U.S.C. 666(a), (b). "In cases in which the custodial parent seeks support enforcement through the state's IV-D agency, commonly termed IV-D cases, the procedure for income withholding must be triggered whenever the absent parent fails to make payments amounting to one month's support...." Note, Legislating Responsibility: North Carolina's New Child Support Enforcement Acts, 65 N.C.L.Rev. 1354, 1357-58 (1987).
The federal scheme mandates advance notice of garnishment to non-custodial parents. The notice must include procedures the absent parent should follow to contest the withholding, including the amount to be withheld and the total amount of arrearage. 42 U.S.C. 666(b)(4)(A); 45 C.F.R. 303.100(a)(5). A state is exempt from these advance notice requirements if there was "a system of income withholding for child support purposes in effect on August 16, 1984" which meets procedural due process requirements of state law. 42 U.S.C. 666(b)(4)(B).
In 1975 Congress enacted the Title IV-D program to improve enforcement of child support payments. Note, Remedies-Domestic Relations: Garnishment for Child Support, 56 N.C.L.Rev. 169 (1978). June 25, 1975 North Carolina amended Chapter 110 of the General Statutes providing a system for child support enforcement to conform to the 1975 Federal enactment. Id. at 169, n. 5. North Carolina's scheme for enforcement was in place before 16 August 1984 and is exempt from federal advance notice requirements so long as North Carolina's scheme complies with state due process requirements.
In Henry v. Edmisten, 315 N.C. 474, 340 S.E.2d 720 (1986), the court formulated this statement of due process requirements under the North Carolina Constitution's Law of the Land clause:
When the furtherance of a legitimate state interest requires the state to engage in prompt remedial action adverse to an individual interest protected by law and the action proposed by the state is reasonably related to furthering the state interest, the law of the land ordinarily requires no more than that before such action is undertaken, a judicial officer determine there is probable cause to *91 believe that the conditions which would justify the action exist.
Henry at 494, 340 S.E.2d at 733. The State concedes that the defendant has a property interest in his wages. The state interest in child support enforcement is established by statute. N.C.G.S. § 110-128 et seq.; see Note, 65 N.C.L.Rev. 1354 (1987). As long as before garnishment occurs "a judicial officer has determined that there is probable cause to believe that the conditions which would justify" garnishment have occurred, state due process requirements are met.
Garnishment is defined as "not an independent action but a proceeding ancillary to attachment." N.C.G.S. § 1-440.21. Attachment is a proceeding ancillary to a pending action. N.C.G.S. § 1-440.1. "Attachment may be had in any action for ... the support of a minor child.... N.C.G.S. § 1-440.2. Like attachment, garnishment is merely a remedy to enforce an underlying order. See Dobbs, Remedies § 1.3 (1973).
Two conditions justify enforcement by garnishment of child support obligations:
[I]n any case in which a responsible parent is under a court order ... to provide child support, a judge of the district court ... may enter an order of garnishment whereby no more than forty percent (40%) of the responsible parent's monthly disposable earnings shall be garnished for the support of his minor child.
N.C.G.S. § 110-136(a), and
An obligor shall become subject to income withholding on the earliest of:
(1) The date on which the obligor fails to make legally obligated child support payments in an amount equal to the support payable for one month....
N.C.G.S. § 110.136.3(b)(1).
On 30 October 1987, when defendant received plaintiff's "Notice of Garnishment," defendant was subject to a valid support order entered 8 March 1985 and modified 7 April 1986. That order was entered following a hearing which accorded defendant substantial due process. As directed by this Court, the order as modified set defendant's arrearage at $2,655.00 by considering only the periods when the defendant was employed and financially able to comply. Lockamy v. Bolton, No. 854DC513 (N.C. Court of Appeals, filed 21 January 1986) (unpublished opinion).
The March 1985 order established the following rate of payment:
(a.) Defendant shall pay $15.00 per week during the months of April through October. Said payments shall be allocated such that $5.00 is applied to fulfill defendant's continuing support obligation for the remaining one minor child; and $10.00 is applied toward payment of the present child support arrearage. (Emphasis added).
(b.) Defendant shall pay $5.00 per week during the months of November through March, all of which payments shall be allocated to fulfill defendant's continuing support obligation for the remaining one minor child.
Defendant argues that due process requires that plaintiff may only garnish automatically at the rate set out in the controlling support order. We agree. As cited already, N.C.G.S. § 110-136 only allows garnishment when the parent is under a court order. Once the underlying order sets out the amount of the ongoing obligation and the amount to be applied toward liquidation of overdue support, IV-D agencies may not garnish at a higher rate without first applying by motion for a modification in the rate at which defendant is to pay arrearage. The motion would be in the nature of a motion to show cause why the defendant should not be garnished at a rate higher than that set out in the underlying order. Cf. N.C.G.S. § 1-352 ("requiring such debtor to appear and answer concerning his property before such court or judge..."). The motion would allow for proper notice and would give the debtor an opportunity to respond to plaintiff's application for a change in the rate of payment on the debt as well as an opportunity to dispute the amount of arrearage. If, as in this case, the underlying order does not set the amount payable as high as the maximum rate of forty percent permitted by N.C.G.S. § 110-136(a), the agency's motion can address that question.
The requirement of a motion to garnish at a rate different than the underlying order *92 complements the federal scheme which requires:
[S]uch withholding must occur without the need for any amendment to the support order involved or for any further action ... by the court or other entity which issued such order.
42 U.S.C. 666(b)(2).
The State must ensure that in the case of each absent parent against whom a support order is or has been issued or modified in the State, and is being enforced under the State plan, so much of his or her wages must be withheld, in accordance with this section, as is necessary to comply with the order.
45 C.F.R. 300.100(a). Plaintiffs in this action could have garnished at the rate of $10.00 per week in compliance with the underlying order. However, N.C.G.S. § 110-136 does not permit plaintiffs to make a unilateral change in the underlying order. Our ruling does not require amendment to the underlying support order, it merely recognizes that due process would require that defendant has a right to be heard on any change in the terms of that order.
In this case defendant's motion requesting a hearing to contest the amount of arrearage and amount to be garnished was granted. The court corrected the amount of arrearage and reduced the amount of weekly garnishment to $40.00 of defendant's $179.78 weekly wage. Prior to the hearing on 9 March 1988, plaintiff garnished $120.00 of defendant's wages at the rate of $60.00 per week. After the hearing, the plaintiff continued garnishing defendant's wages at the rate of $40.00 per week pursuant to the district court's order. Defendant was laid off in April 1988.
The record shows that the defendant had an opportunity to be heard on the amount of arrearage and the rate of garnishment. However, for the future, the burden is upon the enforcement agency to make a motion to alter the rate of payment on arrearage, not the defendant. The defendant is entitled to reimbursement of $100.00 for the two weeks he was garnished above the $10.00 per week allowed in the court's 1985 order.
It is true that if the statutory definition of "Mistakes of Fact" in N.C.G.S. § 110-129(10) were expanded to include as reasons to contest garnishment, the amount of arrearage, and, the rate of garnishment, it would eliminate the need for a separate motion to show cause why the debtor should not be garnished at a higher rate than that set in the underlying order. Additionally it would comport with federal advance notice requirements. 42 U.S.C. 666(b)(4)(A), 45 C.F.R. § 303.100(a)(5). See also Kan.Stat.Ann. § 23-4, 107(f)(4) (1987) (the only basis for contesting the withholding is a mistake of fact concerning the amount of support order, the amount of the arrearage, the amount of income to be withheld or the proper identity of the obligor); see Note, Kansas Enacts New Provisions for Child Support Enforcement, 25 Washburn L.J. 91, 112-15 (1985).
Defendant also contends that the hearing provided by § 110-136.4 in IV-D garnishment proceedings when compared to the hearing granted private litigants under N.C.G.S. § 110-136.5, violates the defendant's rights to equal protection. Given our interpretation of N.C.G.S. § 110-136.4 we find defendant's argument without merit.
Though we disagree with the reasoning of the trial court, for the reasons stated above we affirm its judgment that North Carolina's income withholding scheme, N.C. G.S. § 110-128 et seq. does not violate defendant's due process and equal protection rights. This matter is remanded for reimbursement to the defendant of $100.00, the amount he was garnished at above the rate set in the March 1985 order, before the court heard defendant on the question of the amount to be withheld.
AFFIRMED IN PART AND REVERSED IN PART.
HEDRICK, C.J., and ORR, J., concur.
