How Do I Change Custody or Child Support After the Final Order?

The judge signed the final order, everyone went home, and life kept happening. Two years later the schedule that made sense for a toddler makes no sense for a fourth-grader, one parent has moved an hour away, and the child support number was calculated on a job somebody no longer has.

Clients ask the same question at this point: can anything be done, or am I stuck with the order forever? The answer is that South Carolina draws a sharp line. Everything about the children — custody, visitation, child support — stays open to modification for as long as the children are minors. Nearly everything about the money between the adults — most notably the division of property — is closed for good. And for the part that stays open, there is a gate you must pass through: a substantial change in circumstances, arising after the order, that affects the child’s welfare.

This article explains how that gate works: what tends to count and what does not, who carries the burden, how child support modification differs from custody modification, where these cases get filed, and the one mistake — the informal handshake modification — that produces more avoidable grief than any other.

Final means final — with one exception for children

A final order of the family court is not a suggestion. It binds both parents until it is changed by a court, and violating it invites a contempt action — see our article on enforcing family court orders.

But the family court keeps jurisdiction over its own orders. The statute gives it power “to modify or vacate any order issued by the court.” S.C. Code Ann. § 63-3-530(A)(25). And where children are concerned, the South Carolina Supreme Court has been emphatic for four decades: family courts “have continuing jurisdiction to do whatever is in the best interests of the child regardless of what the separation agreement specifies.” Moseley v. Mosier, 279 S.C. 348, 306 S.E.2d 624 (1983).

That continuing power does not mean the court will re-referee the case whenever a parent is unhappy. It means the door is never locked — but you must have the key.

What “substantial change” actually means

The phrase sounds more mysterious than it is. The Supreme Court’s working definition, repeated as recently as 2024: “A change in circumstances justifying a change in the custody of a child simply means that sufficient facts have been shown to warrant the conclusion that the best interests of the child[] would be served by the change.” Stutz v. Funderburk, 272 S.C. 273, 278, 252 S.E.2d 32, 34 (1979), quoted in Grungo-Smith v. Grungo, 444 S.C. 556, 910 S.E.2d 455 (2024). The change must be one that affects the child — not merely the wishes or convenience of the parents.

Two things follow from that definition. First, there is no checklist. “[T]here exist no hard and fast rules [for determining when to change custody,] and the totality of circumstances peculiar to each case constitutes the only scale upon which the ultimate decision can be weighed.” Davenport v. Davenport, 265 S.C. 524, 527, 220 S.E.2d 228, 230 (1975), quoted in Grungo-Smith. Second, the change must post-date the last order. Facts that existed at the time of the divorce were either litigated or waivable then; they cannot be recycled as a “change.”

Here is how the recurring fact patterns tend to shake out:

The reported cases are instructive because they are so fact-heavy. In Kisling v. Allison, 343 S.C. 674, 541 S.E.2d 273 (Ct. App. 2001), custody changed to the father on proof of an unstable home environment, excessive unexcused school absences, and a custodial parent who actively discouraged the child’s relationship with the other parent. In Grungo-Smith, the Supreme Court reinstated a change of custody where the children’s household had become openly abusive and chaotic while the other parent’s home was, by every account, peaceful. Nobody wins these cases with adjectives. They are won with school records, specific incidents, and witnesses.

The two-step showing, and who carries the burden

The court of appeals put the full test this way, citing Latimer:

Because the best interest of the child is the overriding concern in all child custody matters, when a non-custodial parent seeks a change in custody, the non-custodial parent must establish the following: (1) there has been a substantial change in circumstances affecting the welfare of the child and (2) a change in custody is in the overall best interests of the child.

Klein v. Barrett, 427 S.C. 74, 828 S.E.2d 773 (Ct. App. 2019).

Notice that proving a change only opens the door. The second step is a full best-interest analysis under S.C. Code Ann. § 63-15-240(B), which applies by its terms to “issuing or modifying a custody order” and directs the court to the child’s temperament and developmental needs, each parent’s capacity to meet those needs, the child’s preferences, each parent’s efforts to encourage the child’s relationship with the other parent, the child’s adjustment to home, school, and community, and a dozen other factors. A guardian ad litem is commonly appointed, and under S.C. Code Ann. § 63-3-830(A)(6) the guardian may give a custody recommendation at the merits hearing when the court requests it for reasons placed on the record — a procedure the Supreme Court squarely approved in Grungo-Smith.

The burden sits entirely on the parent seeking the change. If both parents seek to modify, both carry it — in Grungo-Smith, the mother filed first, the father counterclaimed, and the court found he met the burden while she did not.

The order you have is the order you must follow — until a judge signs a new one.

Changing child support

Child support is the most frequently modified term in family court, and the standard is more forgiving than the custody standard: “Family courts may always modify child support upon a proper showing of a change in either the child’s needs or the supporting parent’s financial ability.” Moseley v. Mosier, 279 S.C. 348, 306 S.E.2d 624 (1983).

The recurring triggers:

Changed income. A genuine, involuntary change in either parent’s income — job loss, disability, a significantly better job on the other side — is the bread-and-butter ground. The new amount is calculated under the South Carolina Child Support Guidelines, codified in Article 47, Chapter 114 of the S.C. Code of Regulations. In any proceeding, “there is a rebuttable presumption that the amount of the award which would result from the application of the guidelines … is the correct amount of child support to be awarded.” S.C. Code Ann. § 63-17-470(A). A court that deviates must make specific written findings, and § 63-17-470(C) lists the recognized deviation factors — educational expenses, extraordinary medical costs, other dependents, income disparity, and agreements between the parties, among others.

One trap in the statute: an update to the guidelines themselves is not a ticket back to court. “Application of these guidelines to an existing child support order, in and of itself, is not considered a change in circumstances for the modification of that existing order, except in a Title IV-D case.” § 63-17-470(B).

Changed custody or overnights. Support and the schedule are mathematically linked. The 2024 Guidelines apply a shared-custody calculation (Worksheet C) when “each parent has court-ordered visitation with the children overnight for more than 109 overnights each year (30%)” and both parents contribute to the children’s expenses. So a custody modification usually drags a support modification along with it — and a parent who wins a shared schedule but does not actually exercise it can be taken back to court: the Guidelines expressly let the parent receiving support “petition the court for a reversion” to the non-shared calculation.

Emancipation and aging out. Under S.C. Code Ann. § 63-3-530(A)(17), child support runs until the child turns eighteen, marries, or becomes self-supporting — whichever comes first — but continues while the child is enrolled in and still attending high school, up to graduation or the end of the school year after the child turns nineteen. The court can extend support beyond eighteen for a child with physical or mental disabilities or other exceptional circumstances. When support terminates because the child turns eighteen, graduates from high school, or reaches the end of the school year after turning nineteen, no new arrearage accrues for that child after the terminating date.

Alimony is a different animal with its own modification rules — it can generally be changed on a substantial change in circumstances unless the parties’ agreement says otherwise. That subject has its own page: see our alimony FAQ.

What the court can always revisit — and what it cannot

The line between the modifiable and the unmodifiable is worth stating plainly, because people routinely guess wrong in both directions.

Always modifiable: custody, visitation, and child support. These belong to the child, not the parents, and Moseley holds that the family court’s continuing jurisdiction over them survives any agreement the parents make. Parents cannot bargain away a judge’s power to protect their child.

Generally not modifiable: the property division. The equitable apportionment statute is blunt: “The court’s order as it affects distribution of marital property shall be a final order not subject to modification except by appeal or remand following proper appeal.” S.C. Code Ann. § 20-3-620(C). If the house, the retirement accounts, and the debts were divided in the decree, that division is done. Buyer’s remorse is not a change in circumstances.

In between: terms the parties fixed by agreement. Under Moseley, parties may agree that alimony or other agreement-based terms will never be modifiable, and if the agreement unambiguously says so, that term “binds the court, as well as the parties.” Absent such unambiguous language, court-approved terms remain modifiable and enforceable by contempt. Child-related terms, again, can never be placed beyond the court’s reach.

Where to file: continuing jurisdiction and the UCCJEA

A modification action is a new lawsuit — a summons and complaint, service on the other parent, and (in custody cases) usually a guardian ad litem — filed in the South Carolina family court, which retains the power to modify its own orders. § 63-3-530(A)(25), (30).

When everyone still lives in South Carolina, that is the end of the analysis. When the family has scattered, the Uniform Child Custody Jurisdiction and Enforcement Act, S.C. Code Ann. §§ 63-15-300 to -394, decides which state’s courts may act — and it is not always South Carolina:

• A South Carolina court that made the custody determination keeps exclusive, continuing jurisdiction until a court determines that the child and parents no longer have a significant connection with this State and substantial evidence about the child is no longer available here, or that the child and both parents have all moved away. § 63-15-332(A).
• The mirror image: South Carolina generally cannot modify another state’s custody order unless it would have home-state or significant-connection jurisdiction here and the other state’s court has let go — either by determining it no longer has exclusive continuing jurisdiction (or that South Carolina is the more convenient forum), or because no one lives there anymore. § 63-15-334.
• “Home state” jurisdiction for an initial determination belongs to the state where the child has lived for the six months before the case begins. § 63-15-330(A). Temporary emergency jurisdiction is a separate, narrow exception. § 63-15-336.

The practical takeaway: if the other parent and the child have been gone from South Carolina for years, do not assume the case comes back here just because the divorce happened here. Where you file is a threshold question that should be answered before anything is drafted, not after.

Pleading the change: surviving the motion to dismiss

The opposing playbook in modification cases is predictable: the first response is often a motion to dismiss under Rule 12(b)(6), SCRCP — “failure to state facts sufficient to constitute a cause of action” — arguing that the complaint does not allege a substantial change in circumstances even if everything in it is true.

That motion is beaten at the drafting stage, months before it is filed. A complaint that says the other parent’s home “has become unstable and detrimental” pleads a conclusion. A complaint that says the child has attended three schools in three years, that a named category of household conflict is occurring in the child’s presence, and that the child’s grades and counseling records reflect the fallout pleads facts. Compare the winning record in Kisling — school absences, home instability, documented interference with the other parent’s relationship — with the adjectives that lose these motions.

Two drafting disciplines matter most. Plead only changes that arose after the last order, and anchor every allegation to something provable. If you cannot say when it started, who saw it, and how it shows up in the child’s life, it is not ready to be a paragraph in a complaint.

The misconception: “we just agreed to a new schedule”

The most common — and most dangerous — belief about modification is that parents can simply agree their way into a new arrangement. They text each other, the child starts spending week-on/week-off, someone starts paying a little less support “because the time is equal now,” and everyone assumes the problem is solved.

It is not. Under Moseley, terms acquire legal force when the court approves them: “With the court’s approval, the terms become a part of the decree and are binding on the parties and the court.” Until then, the old order controls. The parent paying reduced support is accruing an arrearage under an order that never changed. The parent allowing extra time has no enforceable right to it, and the schedule can be yanked back the moment the relationship sours. Informal flexibility is not itself wrongdoing — in Grungo-Smith, the Supreme Court declined to punish a father whose departures from the strict schedule were driven by the children’s school needs — but it settles nothing, protects no one, and often becomes contested evidence in the next round.

The fix is cheap relative to the risk: when both parents genuinely agree, put the agreement in a consent order and have it approved. If it truly reflects the children’s interests, approval is rarely difficult — and then it is real.