What does filing a modification cost?

$150, paid to the Family Court Clerk with Form SCCA431 (Support Complaint), modification box checked. Self-represented parties with financial hardship can file an Affidavit of Indigency (Form SCCA/400) to waive the fee.

How is child support enforced in South Carolina?

Through wage garnishment, tax refund intercepts, license suspensions (for arrears over $500), bank account levies (for arrears over $1,000), passport denial, and credit bureau reporting. A judge can impose fines up to $1,500 and jail time up to one year for contempt, if the court confirms the parent had the ability to pay. There's no statute of limitations for arrears.

South Carolina, United States

South Carolina Child Support: A Parent's Guide

Q: How is child support calculated in South Carolina?

Using the income shares model: both parents' gross monthly incomes are combined, the total obligation is read from the Schedule of Basic Child Support Obligations, and each parent pays a proportional share, with additional costs for childcare and health insurance divided the same way.

Q: How do I request a modification in South Carolina?

Courts generally consider a shift of 20% or more in income significant enough to warrant modification, alongside other substantial changes like job loss, disability, or changes in custody arrangements. Parents are also entitled to an administrative review every three years.

Q: Can a modification reduce support I already owe?

No. A modification only affects future payments from the date the petition is filed; South Carolina courts cannot retroactively reduce child support that has already accrued.

How child support works in South Carolina, in plain English: the income shares guidelines, the 20% modification rule, and enforcement.

Legal sources reviewed: August 10, 2026

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In short: South Carolina's income shares guidelines support a modification once income shifts by 20% or more, with a guaranteed 3-year administrative review. Modifications are prospective only, can't touch already-accrued arrears, and enforcement escalates through specific dollar thresholds: license suspension at $500 in arrears, bank levies at $1,000, with no statute of limitations on collecting old debt.

This is an educational overview written for parents, not lawyers. It isn't legal advice. For anything beyond general understanding, talk to a licensed South Carolina family law attorney.

What South Carolina generally provides

South Carolina calculates child support using the income shares model: both parents' gross monthly incomes are combined, the total obligation is read from the Schedule of Basic Child Support Obligations, and each parent pays a proportional share, with childcare and health insurance costs divided the same way.

Important terminology

Schedule of Basic Child Support Obligations: South Carolina's statutory guideline table.
20% income shift rule: the general benchmark courts use to consider whether a modification is warranted.
Prospective-only modification: South Carolina's rule that a modification affects only future payments, from the filing date forward.

How the calculation works

Combining gross income against the schedule

Both parents' gross monthly incomes are combined and matched against the Schedule of Basic Child Support Obligations, with each parent paying their proportional share, and childcare and health insurance costs divided the same way on top of the base obligation.

Requesting or defending a modification

Courts generally consider a shift of 20% or more in income significant enough to warrant a modification, alongside other substantial changes like job loss, disability, or changes in custody arrangements. Parents are also entitled to an administrative review every three years. Filing costs $150, paid to the Family Court Clerk with Form SCCA431 (Support Complaint, modification box checked); self-represented parties facing financial hardship can file an Affidavit of Indigency (Form SCCA/400) to waive the fee. Critically, a modification only affects future payments from the date the petition is filed, South Carolina courts cannot retroactively reduce child support that has already accrued. See the child support calculator and guideline finder for jurisdiction-specific calculation sources and guidance.

How enforcement works

South Carolina's enforcement escalates through specific arrears thresholds: wage garnishment and tax refund intercepts apply broadly, license suspensions trigger once arrears exceed $500, and bank account levies apply once arrears exceed $1,000. Additional tools include passport denial and credit bureau reporting. For contempt, a judge can impose fines up to $1,500 and jail time up to one year, but the court must first confirm the parent had the ability to pay before ordering jail time. There is no statute of limitations for child support arrears in South Carolina, old unpaid support remains collectible indefinitely.

Common questions

Will a modification erase support I already owe? No, modifications are strictly prospective, arrears that accrued before you filed remain fully owed regardless of the outcome.

How much do I need to fall behind before facing license suspension? A relatively modest $500 in arrears can trigger license suspension, a much lower threshold than the $1,000 needed for bank account levies.

What if my co-parent isn't paying? Contact South Carolina's child support enforcement division, which can pursue wage garnishment, license suspension, bank levies, and, in serious cases, contempt proceedings.

Practical considerations

Because South Carolina places no time limit on collecting arrears and modifications can't reach backward, filing promptly after a real change in circumstances is the only way to limit how much accrues at the old rate, waiting doesn't help and can expose you to escalating enforcement. For the custody rules underlying the parenting-time side of these calculations, see the South Carolina custody guide.

Official South Carolina resources

South Carolina Child Support Guidelines

FAQ

Questions, answered

This information is provided for educational purposes only and is not legal advice. Family law varies by individual circumstances and may change over time. Consult a qualified attorney or appropriate official resource for advice about your situation.