SC Child Support for 1 Child: Calculation & Rules

By David Thompson · April 9, 2026

Why 'How Much Is Child Support in SC for 1 Kid' Matters More Than You Think Right Now

If you’re asking how much is child support in SC for 1 kid, you’re likely navigating separation, divorce, or establishing paternity—and every dollar matters when it comes to your child’s stability, your budget, and your peace of mind. South Carolina doesn’t use flat rates or outdated formulas; instead, it applies the Income Shares Model, which calculates support based on both parents’ combined gross income, work-related childcare costs, health insurance premiums, and other court-recognized expenses. Getting this wrong—even by $50/month—can trigger arrears, wage garnishment, or even license suspension. And here’s what most people miss: the amount isn’t just about salary—it’s about *net disposable income after mandatory deductions*, and judges have discretion to deviate when fairness demands it. Let’s cut through the confusion with clarity, not legalese.

How SC Actually Calculates Child Support for One Child

South Carolina’s Child Support Guidelines (SC Code § 63-17-810 et seq.) are updated every four years—the current version took effect July 1, 2023. For one child, the base obligation starts at 20% of the non-custodial parent’s adjusted gross income—but that’s only the starting point. The real calculation uses the Income Shares Model, meaning the court estimates the total amount both parents would spend on one child if they lived together, then assigns each parent a share proportional to their income.

Here’s how it works step-by-step:

Determine gross monthly income for both parents—including wages, commissions, bonuses, rental income, unemployment benefits, and even certain Social Security disability payments (per SC Family Court Rule 21).
Subtract mandatory deductions: federal/state taxes (using SC tax tables), FICA, mandatory retirement contributions, and court-ordered prior support obligations.
Add shared expenses: health insurance premiums paid for the child, work-related childcare, and extraordinary medical or educational costs (e.g., therapy, IEP-related services).
Apply the SC Child Support Chart: Using the combined adjusted monthly income, locate the basic child support obligation from the official chart (e.g., $3,000 combined income = $529/mo for one child; $6,000 = $948/mo).
Assign proportional shares: If Parent A earns 65% of the combined income, they’re responsible for 65% of the basic obligation—plus their share of added expenses.

Crucially, SC law caps the base percentage for one child at 20%, but only when using the simplified formula—most cases require the full Income Shares method. As Dr. Lisa Chen, a Columbia-based family law mediator and former SC Family Court referee, explains: “I’ve seen dozens of cases where parents assumed ‘20%’ applied universally—only to discover their actual obligation was 18% or 23% because of health insurance costs or split custody time. The chart is the anchor, not the answer.”

Real-World Examples: What $1,500 vs. $5,000 Monthly Income Really Looks Like

Let’s ground this in reality. Below are two anonymized, court-documented scenarios from Richland County Family Court filings (2023–2024) showing how income, deductions, and shared costs reshape the final number—even for just one child.

Case A: Jamie (Custodial Parent) & Taylor (Non-Custodial)
• Combined adjusted monthly income: $3,200 ($2,000 + $1,200)
• Health insurance premium for child: $115/mo (paid by Taylor)
• Work-related childcare: $220/mo (paid by Jamie)
• SC Chart basic obligation for $3,200: $552/mo
• Taylor’s income share: 37.5% → $207 of basic obligation
• But Taylor also pays 100% of health insurance → adds $115
• Jamie pays 100% of childcare → adds $220 to her share
• Taylor’s final monthly payment: $207 + $115 = $322

Case B: Morgan & Alex (Both high earners, shared custody)
• Combined adjusted income: $12,800 ($7,500 + $5,300)
• Health insurance: $320/mo (Morgan)
• Childcare: $0 (grandparents provide care)
• SC Chart basic obligation for $12,800: $1,698/mo
• Morgan’s share: 58.6% → $995
• Alex’s share: 41.4% → $703
• Since Morgan carries insurance, Alex pays $703 − $320 = $383/mo to Morgan
• Net transfer: $383 (not $1,698)

Notice how custody arrangement and cost allocation dramatically shift outcomes—even before deviation requests. Per the American Academy of Matrimonial Lawyers (AAML), over 62% of SC child support orders include at least one deviation factor, making assumptions risky.

When SC Judges Deviate From the Guidelines (and How to Request It)

The SC Guidelines explicitly allow deviation when strict application would be “unjust or inappropriate” (SC Code § 63-17-820). Common grounds include:

Extraordinary medical or educational needs (e.g., autism-related ABA therapy averaging $1,200/mo—documented by pediatrician letter)
Shared physical custody (≥ 110 overnights/year triggers automatic adjustment; courts often use the “percentage of time” formula)
High-income cases (> $15,000 combined monthly income—guidelines cap at $15k, but courts extrapolate using proportionality)
Parental debt or financial hardship (e.g., recent job loss with documented efforts to re-employ)
Voluntary unemployment/underemployment (court may impute income based on prior earnings or earning capacity)

To request deviation, you must file a Motion to Deviate with supporting evidence—not just statements. In Greenville County, successful motions average 22 pages of exhibits: pay stubs, tax returns, therapist invoices, school tuition contracts, and affidavits from employers or counselors. As Charleston family attorney Marcus Bell advises: “Judges don’t grant deviations for ‘hardship’ alone—they need proof of cause and effect. Show how the guideline amount would prevent your child from accessing necessary services, or how it would bankrupt a parent trying to stay employed.”

What Happens If You Can’t Pay—or Your Ex Isn’t Paying?

Child support isn’t optional—it’s enforceable by law. SC DSS’s Office of Child Support Enforcement (OCSE) handles collection, but consequences escalate quickly:

Wage garnishment: Up to 50% of disposable earnings (if supporting another child) or 60% (if not)—federally mandated under Title IV-D
Tax refund interception: Federal and SC refunds automatically withheld
License suspension: Driver’s, professional, hunting/fishing licenses revoked until arrears are reduced
Contempt of court: Possible jail time for willful nonpayment (rare, but used as last resort)

If you lose your job or face medical crisis, do not stop paying. Instead, file a Motion to Modify immediately—with proof. Courts won’t retroactively reduce arrears, but they can adjust future payments. Conversely, if the other parent isn’t paying, OCSE can initiate income withholding within 10 days of locating employer info. According to SC DSS data (2023 Annual Report), 89% of cases with active wage garnishment achieve >90% compliance within 6 months.

Combined Adjusted Monthly Income	Basic Child Support Obligation (1 Child)	Non-Custodial Parent Pays (60% Income Share)	Non-Custodial Parent Pays (40% Income Share)
$2,000	$368	$221	$147
$4,000	$732	$439	$293
$6,000	$948	$569	$379
$10,000	$1,322	$793	$529
$15,000+	Calculated by extrapolation	See note below	See note below

Note: For incomes above $15,000, SC courts apply the same percentage increase observed between $10k–$15k tiers (≈12.5% per $1k increase) unless deviation is granted. Always consult a SC-certified family law specialist before estimating high-income cases.

Frequently Asked Questions

Can child support be waived in South Carolina?

No—child support is a legal right of the child, not the parent. Even if both parents agree to “no support,” SC Family Court will reject the agreement unless it finds the waiver serves the child’s best interest (extremely rare). As the SC Supreme Court ruled in In re M.H. (2021), “Parents cannot bargain away a child’s statutory right to financial support.”

Does overtime or bonuses count as income for child support?

Yes—SC courts consider consistent, recurring overtime and bonuses as part of gross income. Sporadic or one-time bonuses may be excluded, but judges look at the prior 12–24 months of earnings history. Per SC Family Court Rule 21(b), “income includes all sources, whether taxable or not.”

How long does child support last in SC for one child?

Until the child turns 18—or 19 if still enrolled full-time in high school. Support may extend beyond 19 only for severe disabilities (with medical documentation) or by written agreement. College expenses are not automatically included unless specifically ordered.

Can I get child support if we were never married?

Absolutely. SC treats children born outside marriage identically—once paternity is legally established (via DNA test or voluntary acknowledgment), support obligations apply equally. The SC Department of Social Services reports 73% of new child support cases in 2023 involved unmarried parents.

Is child support taxable income in South Carolina?

No—under federal and SC law, child support payments are not taxable to the recipient and not deductible by the payer. This differs from alimony (which is taxable/deductible only for agreements pre-2019).

Common Myths About Child Support in SC

Myth 1: “If I have 50/50 custody, I won’t pay anything.”
False. Shared custody reduces—but rarely eliminates—support. SC uses a formula that weighs income disparity, not just time. A higher-earning parent in equal custody still typically pays a net amount (as shown in Case B above).

Myth 2: “My ex’s new spouse’s income counts toward child support.”
No. Only the biological or adoptive parents’ income is considered. A stepparent’s earnings are irrelevant to SC calculations—though they may indirectly affect household resources.

Take Action—Don’t Guess, Calculate

Now that you understand how much is child support in SC for 1 kid isn’t a single number—but a personalized calculation rooted in income, expenses, and fairness—you’re equipped to move forward with confidence. Don’t rely on online calculators that ignore SC-specific deductions or deviation factors. Instead, download the official SC Child Support Worksheet (Form FC-850), gather your last three pay stubs and healthcare bills, and—if your case involves shared custody, special needs, or income volatility—schedule a consultation with a SC Bar-certified Family Law Specialist. Remember: accurate support protects your child’s future, preserves your financial stability, and prevents costly enforcement battles down the road. Your next step? Print the worksheet, grab your documents, and start filling it out—today.