How to Modify Child Support in South Carolina
Reviewed by DocDraft Legal Team · South Carolina · Last updated September 21, 2026
In South Carolina, a child support modification is a Family Court order changing the amount of an existing child support order after a showing of changed circumstances (S.C. Code 63-17-310). Distinctively, South Carolina does not treat applying updated guidelines alone as a change in circumstances, except in a Title IV-D case (S.C. Code 63-17-470). Support is set by a statewide guideline tied to each parent's income and parenting time, so a real change in income, a job loss, or a new custody schedule can make the current amount too high or too low. You can seek a change two ways. You can file a Complaint for Modification in the Family Court in the county that issued your order, using the self-represented packets (Complaint SCCA 400.21 to decrease or SCCA 400.31 to increase), or, if South Carolina Child Support Services enforces your case, you can ask that agency to review and adjust the order. There is no fixed percentage in the statute; you must show a substantial change since the last order. A change takes effect only from the date you file and serve your action, not from when your circumstances changed, so installments that already came due cannot be reduced (S.C. Code 63-17-310). Keep paying your current order until the court changes it. Attorney review of your filing is available through DocDraft.
Find out where you stand in South Carolina
Where are you with changing your child support order?
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How do I modify child support in South Carolina?
File a Complaint for Modification in the Family Court in the county that issued your order, using packet SCCA 400.21 to decrease or SCCA 400.31 to increase, or ask South Carolina Child Support Services to review your case. You must show a substantial change in circumstances since the last order (S.C. Code 63-17-310).
How much does income have to change to modify child support in South Carolina?
South Carolina sets no fixed percentage in its statute. You must show a substantial change in circumstances since the last order, such as a real change in income or custody (S.C. Code 63-17-310). Applying updated guidelines alone is not a change, except in a Title IV-D case (S.C. Code 63-17-470).
How far back can a child support change go in South Carolina?
A modification is effective only from the date you file and serve your action, not from when circumstances changed. Installments accruing before filing and service cannot be reduced (S.C. Code 63-17-310), so filing promptly protects you. Keep paying the current order until the Family Court changes it.
Which court handles child support modifications in South Carolina?
The Family Court in the county that issued your existing order handles modifications (S.C. Code 63-17-310). If South Carolina Child Support Services enforces your case, you can also ask that agency to review and adjust the order. Both apply the statewide child support guidelines to recalculate the amount.
South Carolina child support modification at a glance
In South Carolina, you change an existing child support order by asking the Family Court to modify it upon a showing of changed circumstances, and there is no fixed percentage set in the statute (S.C. Code 63-17-310). A distinctive rule is that applying updated guidelines to an existing order, by itself, is not a change in circumstances, except in a Title IV-D case (S.C. Code 63-17-470). Support follows a statewide guideline tied to income and parenting time, so a real income change or a new custody schedule can justify a new amount. You file a Complaint for Modification in the county that issued your order, using SCCA 400.21 to decrease or SCCA 400.31 to increase, or ask South Carolina Child Support Services to review your case. A change applies only from filing and service, so installments that already came due cannot be reduced (S.C. Code 63-17-310).
Lowering a South Carolina order after a pay cut
Suppose the Family Court set your South Carolina child support two years ago when you earned more, and your hours were just cut. Because South Carolina requires a substantial change in circumstances, you gather proof of your lower income and complete the Complaint to Decrease Child Support packet (SCCA 400.21) with a Financial Declaration (SCCA430). You file it in the county that issued your order and have the other parent served. Because a modification is effective only from filing and service (S.C. Code 63-17-310), you file and serve right away rather than waiting, and you keep paying the current amount until the court rules. At the hearing the judge recalculates support under the statewide guideline and signs a lower order effective from filing and service. Attorney review of your filing is available through DocDraft.
Relevant Laws
S.C. Code 63-17-310 (Family Court authority; changed circumstances and effective date)
Gives the Family Court the right to modify a child support order upon a showing of changed circumstances, and provides that no such modification is effective as to any installment accruing prior to filing and service of the action for modification.
S.C. Code 63-17-470 (guideline presumption; when guidelines alone are not a change)
Creates a rebuttable presumption that the statewide guideline amount is correct, and provides that applying the guidelines to an existing order, in and of itself, is not a change in circumstances for modification, except in a Title IV-D case.
S.C. Code 63-17-830 (modification of orders through the agency)
Allows an obligor or obligee to request modification of an existing support order through the child support division on a showing of changed circumstances, with the matter proceeding to the Family Court, and provides that only payments accruing after the modification may be modified.
South Carolina Judicial Branch: self-represented child support forms
The South Carolina Judicial Branch provides the self-represented Complaint for Modification packets (SCCA 400.21 to decrease, SCCA 400.31 to increase), the Family Court Summons (SCCA 401F), Coversheet (SCCA467), and Financial Declaration (SCCA430) with instructions, free of charge.
Regional Variances
South Carolina child support modification rules at a glance
Qualifying threshold
South Carolina sets no fixed percentage in its statute; you must show a substantial change in circumstances since the last order (S.C. Code 63-17-310). Applying updated guidelines alone is not a change in circumstances, except in a Title IV-D case (S.C. Code 63-17-470).
Where to file
The Family Court in the county that issued your existing order. If South Carolina Child Support Services enforces your case, you can instead ask that agency to review and adjust the order and bring it to the Family Court (S.C. Code 63-17-830).
Modification form
The self-represented Complaint for Modification packet: SCCA 400.21 to decrease support or SCCA 400.31 to increase it, with the Coversheet (SCCA467), Summons (SCCA 401F), and Financial Declaration (SCCA430). Forms are free through the South Carolina Judicial Branch.
Retroactivity
A modification is not effective as to any installment accruing prior to filing and service of the action for modification (S.C. Code 63-17-310). Support that already came due cannot be reduced, so filing and serving promptly protects the effective date.
Periodic review
If South Carolina Child Support Services enforces your case, the agency reviews orders about every three years and adjusts them where the guideline amount differs, and sooner on a substantial change (S.C. Regulation 114-4740).
Suggested Compliance Checklist
Gather proof of your changed circumstances
Before you file days after startingCollect current pay stubs, tax returns, and proof of the change (job loss, income change, or a new custody schedule), and estimate the new guideline amount for South Carolina. Attorney review of your filing is available through DocDraft.
Confirm South Carolina's modification standard
Before you file days after startingConfirm you can show a substantial change in circumstances since the last order (S.C. Code 63-17-310), and remember that applying updated guidelines alone is not a change, except in a Title IV-D case (S.C. Code 63-17-470).
Complete the Complaint for Modification packet
As soon as your circumstances change days after startingFill out packet SCCA 400.21 to decrease or SCCA 400.31 to increase support, plus the Coversheet (SCCA467), Summons (SCCA 401F), and Financial Declaration (SCCA430). Use the free South Carolina Judicial Branch forms and instructions.
File with the Family Court
Promptly (the change dates back to filing and service) days after startingFile your Complaint, Summons, Coversheet, and Financial Declaration with the Family Court clerk in the county that issued your order and pay the filing fee. Because a change applies back only to filing and service, file promptly (S.C. Code 63-17-310).
Serve the other parent
As soon as possible after filing days after startingHave the other parent properly served with your filed Summons and Complaint, then file proof of service. A modification is not effective as to installments accruing before filing and service, so serve promptly (S.C. Code 63-17-310).
Attend the hearing and get the new order
On your hearing date days after startingGo to the hearing with your income proof, let the Family Court recalculate support under the statewide guideline, and get the signed order effective back to filing and service. Keep paying the current order until then.
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Gather proof of your changed circumstances | Collect current pay stubs, tax returns, and proof of the change (job loss, income change, or a new custody schedule), and estimate the new guideline amount for South Carolina. Attorney review of your filing is available through DocDraft. | - | Before you file |
| Confirm South Carolina's modification standard | Confirm you can show a substantial change in circumstances since the last order (S.C. Code 63-17-310), and remember that applying updated guidelines alone is not a change, except in a Title IV-D case (S.C. Code 63-17-470). | - | Before you file |
| Complete the Complaint for Modification packet | Fill out packet SCCA 400.21 to decrease or SCCA 400.31 to increase support, plus the Coversheet (SCCA467), Summons (SCCA 401F), and Financial Declaration (SCCA430). Use the free South Carolina Judicial Branch forms and instructions. | - | As soon as your circumstances change |
| File with the Family Court | File your Complaint, Summons, Coversheet, and Financial Declaration with the Family Court clerk in the county that issued your order and pay the filing fee. Because a change applies back only to filing and service, file promptly (S.C. Code 63-17-310). | - | Promptly (the change dates back to filing and service) |
| Serve the other parent | Have the other parent properly served with your filed Summons and Complaint, then file proof of service. A modification is not effective as to installments accruing before filing and service, so serve promptly (S.C. Code 63-17-310). | - | As soon as possible after filing |
| Attend the hearing and get the new order | Go to the hearing with your income proof, let the Family Court recalculate support under the statewide guideline, and get the signed order effective back to filing and service. Keep paying the current order until then. | - | On your hearing date |
Frequently Asked Questions
A real, involuntary income drop can be a substantial change in circumstances, but you must file a Complaint for Modification to change the amount; support keeps accruing at the old rate until the Family Court acts (S.C. Code 63-17-310). A judge may weigh whether you are earning what you reasonably could. Do not simply stop paying.
No. Either parent can file a Complaint for Modification on their own, and the other parent is served and can respond. If both parents agree on a new amount, they can present a written agreement for the Family Court to approve. The court still checks the amount against the statewide guideline in South Carolina.
After you file your Complaint and complete service, the Family Court sets a hearing, often several weeks to a few months out depending on the county. An uncontested change or a South Carolina Child Support Services review can be faster. Because the change dates back only to filing and service, filing promptly protects you (S.C. Code 63-17-310).
If the agency enforces your case, you can send a written request for review to your caseworker. The agency proceeds on a showing of changed circumstances and, if appropriate, brings the modification to the Family Court (S.C. Code 63-17-830). The Family Court still enters the modified order in South Carolina.
You can seek a modification whenever a substantial change in circumstances occurs. Separately, if South Carolina Child Support Services enforces your case, the agency reviews orders about every three years and adjusts them where the guideline amount differs (S.C. Regulation 114-4740). There is no limit on filing when circumstances genuinely change.
A modification is not effective as to any installment accruing before filing and service (S.C. Code 63-17-310). Support that already came due, called arrears, cannot be reduced or erased by a modification. Keep paying your current order to avoid building arrears while your South Carolina case is pending.
Use the self-represented packet: Complaint SCCA 400.21 to decrease support or SCCA 400.31 to increase it, with the Family Court Coversheet (SCCA467), the Summons (SCCA 401F), and a Financial Declaration (SCCA430). The South Carolina Judicial Branch provides these forms and instructions at no charge.
No. In South Carolina, applying the current guidelines to an existing order, by itself, is not a change in circumstances, except in a Title IV-D case (S.C. Code 63-17-470). You must show a separate substantial change, such as a real income or custody change, to modify a private order.
Other South Carolina guides
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Filing a Workplace Harassment Complaint in South Carolina
Filing Chapter 7 Bankruptcy in South Carolina (2026)
Firing an Employee in South Carolina (2026)
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