🔍
Home›Finance›Child Support Calculator Sc
💰 Finance

South Carolina Child Support Calculator

Free SC child support calculator. Estimate monthly payments based on income, custody, and expenses. Plan your finances with accurate results.

⚡ Free to use 📱 Mobile friendly 🕒 Updated: June 21, 2026
🧮 Child Support Calculator Sc
📊 Monthly Child Support Obligation by Combined Parental Income (South Carolina Guidelines)
📋 Table of Contents
  1. Use the Child Support Calculator Sc
  2. What is Child Support Calculator Sc?
  3. How to Use
  4. Formula Used
  5. Example Calculation
  6. Benefits
  7. Tips and Tricks
  8. Conclusion
  9. FAQ (8 Questions)

What is Child Support Calculator Sc?

A Child Support Calculator SC is a specialized online tool designed to estimate the amount of child support one parent may be required to pay to the other in the state of South Carolina. It applies the state’s specific guidelines, which are based on the combined gross income of both parents and the number of children involved, to produce a fair and legally consistent support figure. This tool is essential for parents navigating divorce, separation, or paternity cases where financial support for a minor child must be determined.

This calculator is primarily used by custodial and non-custodial parents, family law attorneys, mediators, and even judges to quickly generate a guideline support amount. It matters because South Carolina law mandates that child support be calculated using these specific statutory formulas, and having a reliable estimate helps families plan their budgets, avoid costly litigation, and ensure the child’s needs are met. Without this tool, parents would have to manually compute complex income shares and adjustments, which often leads to errors and misunderstandings.

Our free Child Support Calculator SC provides an intuitive, step-by-step interface that mirrors the official South Carolina Child Support Guidelines worksheet. It allows you to input your gross monthly income, parenting time percentages, and allowable deductions to instantly see a projected support amount, giving you clarity and confidence before you ever step into a courtroom.

How to Use This Child Support Calculator Sc

Using this calculator is straightforward, but accuracy depends on entering correct financial data. Follow these five steps to get the most reliable estimate for your South Carolina child support obligation.

  1. Enter Gross Monthly Income for Both Parents: Input the gross monthly income (before taxes or deductions) for the non-custodial parent and the custodial parent. This includes wages, salaries, bonuses, commissions, self-employment income, rental income, and investment returns. For salaried employees, divide annual salary by 12. For hourly workers, multiply hourly rate by average hours per week then by 4.33. Be sure to include income from all sources, as South Carolina guidelines consider total gross income.
  2. Input the Number of Children: Select the number of minor children for whom support is being calculated. The calculator uses South Carolina’s child support schedule, which scales the basic support obligation based on the combined parental income and the number of children. More children means a higher total obligation, though the per-child amount decreases slightly with each additional child.
  3. Enter Parenting Time (Overnights per Year): Input the number of overnights the non-custodial parent expects to have with the children annually. South Carolina uses a formula to adjust support based on parenting time. If the non-custodial parent has fewer than 109 overnights (roughly 30%), the standard support amount applies. With 109 to 164 overnights, a shared parenting adjustment reduces the obligation. Entering accurate overnights is critical because this adjustment can significantly change the final amount.
  4. Add Allowable Deductions: Enter any mandatory deductions from gross income, such as federal and state income taxes, FICA (Social Security and Medicare), mandatory retirement contributions (like a state pension or 401k if court-ordered), and health insurance premiums paid for the child. Also include any other child support payments you are legally required to make for children from a different relationship. These deductions reduce the gross income to a net income used in the final calculation.
  5. Add Child-Related Expenses: Input the monthly cost of health insurance premiums for the child (if paid by either parent) and any recurring work-related childcare expenses. These are added to the basic support obligation and then prorated between the parents based on their income shares. Do not include extracurricular activities or school fees unless they are court-ordered, as those are typically handled separately.

After entering all data, click the "Calculate" button. The tool will display the monthly guideline support amount, the custodial parent’s share, and the non-custodial parent’s share. For best results, double-check all income figures against recent pay stubs or tax returns, and consult with a family law attorney for a legally binding determination.

Formula and Calculation Method

The South Carolina child support calculation is based on the "Income Shares Model," which assumes that a child should receive the same proportion of parental income they would have if the parents lived together. The formula combines both parents’ gross incomes, applies a standard schedule, and then prorates the obligation based on each parent’s income share. The core formula is defined in South Carolina Code Section 63-17-470.

Formula
Basic Child Support Obligation (BCSO) = Value from SC Child Support Schedule based on Combined Adjusted Gross Income and Number of Children

Parent A’s Share = (Parent A’s Adjusted Gross Income / Combined Adjusted Gross Income) × (BCSO + Health Insurance Premium + Work-Related Childcare Costs)

Parent B’s Share = (Parent B’s Adjusted Gross Income / Combined Adjusted Gross Income) × (BCSO + Health Insurance Premium + Work-Related Childcare Costs)

Guideline Support Amount (Non-Custodial to Custodial) = Non-Custodial Parent’s Share – (Health Insurance Premium paid by Non-Custodial + Childcare paid by Non-Custodial)

Each variable in this formula plays a critical role. The "Combined Adjusted Gross Income" is the sum of both parents’ gross monthly incomes minus allowable deductions (taxes, FICA, mandatory retirement, prior child support). The "BCSO" comes from a statutory table that lists dollar amounts for every $50 increment of combined income, up to a certain cap. For high-income cases, the court may deviate upward. The "Health Insurance Premium" and "Work-Related Childcare Costs" are added to the BCSO because these are direct, necessary expenses for the child’s well-being.

Understanding the Variables

Gross Monthly Income: This is the total income before any deductions. South Carolina defines it broadly to include wages, salaries, tips, bonuses, commissions, self-employment income, rental income, dividends, interest, and even imputed income if a parent is voluntarily unemployed or underemployed. Do not include income from public assistance programs like TANF or SSI.

Allowable Deductions: These include federal and state income taxes (calculated based on filing status and exemptions), FICA taxes (7.65% of gross wages for employees), mandatory retirement contributions (e.g., teacher retirement or military pension), and health insurance premiums for the child. Also deductible are any court-ordered child support payments for children from a prior relationship. These deductions reduce gross income to "adjusted gross income."

Parenting Time Adjustment: When the non-custodial parent has 109 or more overnights per year, a shared parenting adjustment applies. The formula multiplies the BCSO by 1.5, then prorates based on each parent’s income, and then subtracts the amount the non-custodial parent spends directly on the child during their parenting time. This prevents double-counting of expenses.

Step-by-Step Calculation

First, calculate each parent’s gross monthly income and subtract allowable deductions to get adjusted gross income. Second, add both adjusted gross incomes to get the combined adjusted gross income. Third, locate the BCSO from the South Carolina Child Support Schedule using the combined income and number of children. Fourth, add any health insurance and childcare costs to the BCSO to get the total support need. Fifth, calculate each parent’s income share percentage (their adjusted income divided by combined income). Sixth, multiply the total support need by each parent’s percentage to find their respective support obligations. Finally, if the non-custodial parent pays for health insurance or childcare directly, subtract those amounts from their obligation to determine the net payment owed to the custodial parent. If parenting time exceeds 109 overnights, apply the shared parenting adjustment before the final subtraction.

Example Calculation

Let’s walk through a realistic scenario involving a family in Greenville, South Carolina. This example uses actual figures that a typical middle-income family might encounter.

Example Scenario: John (non-custodial) and Mary (custodial) have two children, ages 6 and 10. John earns a gross monthly salary of $5,000 as a software developer. Mary earns $3,500 gross monthly as a teacher. They have a shared parenting plan where John has the children 120 overnights per year. John pays $200 per month for the children’s health insurance. Mary pays $600 per month for after-school childcare. John also pays $300 per month in court-ordered child support for a child from a prior relationship.

Step 1: Calculate Adjusted Gross Incomes. John’s gross: $5,000. Deductions: Federal/state taxes (estimated at 22% combined = $1,100), FICA (7.65% = $382.50), mandatory 401k (5% = $250), prior child support ($300). Total deductions: $2,032.50. John’s adjusted gross: $5,000 – $2,032.50 = $2,967.50. Mary’s gross: $3,500. Deductions: Taxes (estimated at 15% combined = $525), FICA (7.65% = $267.75), mandatory teacher retirement (8% = $280). Total deductions: $1,072.75. Mary’s adjusted gross: $3,500 – $1,072.75 = $2,427.25.

Step 2: Combined Adjusted Gross Income. $2,967.50 + $2,427.25 = $5,394.75.

Step 3: Find BCSO from Schedule. Using the SC Child Support Schedule for two children, a combined income of $5,394.75 falls between $5,350 and $5,400. The BCSO for $5,350 is $1,308; for $5,400 it is $1,317. Interpolating: ($5,394.75 – $5,350) / $50 = 0.895. BCSO = $1,308 + (0.895 × $9) = $1,316.06. Round to $1,316.

Step 4: Add Child-Related Expenses. Health insurance: $200 (paid by John). Childcare: $600 (paid by Mary). Total additional: $800. Total support need: $1,316 + $800 = $2,116.

Step 5: Income Shares. John’s share: $2,967.50 / $5,394.75 = 55.0%. Mary’s share: 45.0%. John’s obligation: 55% × $2,116 = $1,163.80. Mary’s obligation: 45% × $2,116 = $952.20.

Step 6: Parenting Time Adjustment (120 overnights). Since 120 109, apply shared parenting. Multiply BCSO by 1.5: $1,316 × 1.5 = $1,974. Add additional costs: $1,974 + $800 = $2,774. John’s adjusted obligation: 55% × $2,774 = $1,525.70. Mary’s adjusted obligation: 45% × $2,774 = $1,248.30. John’s direct spending during his 120 overnights (estimated at 33% of BCSO = $1,316 × 0.33 = $434.28). Net John owes: $1,525.70 – $434.28 = $1,091.42. Subtract John’s payments for insurance and childcare: John pays $200 insurance + $0 childcare = $200. Net payment to Mary: $1,091.42 – $200 = $891.42 per month.

In plain English, John would owe Mary approximately $891 per month in child support. This accounts for his higher income, the shared parenting time, and his direct payment of health insurance. The result is lower than the standard amount because John has significant parenting time and pays insurance.

Another Example

Consider a different scenario: Sarah (non-custodial) earns $2,800 gross monthly as a nurse, and Tom (custodial) earns $4,200 gross monthly as a manager. They have one child, and Sarah has 50 overnights per year (standard visitation). No health insurance or childcare costs. Sarah’s deductions: taxes/FICA ($700), mandatory retirement ($140). Adjusted: $1,960. Tom’s deductions: taxes/FICA ($1,050), no retirement. Adjusted: $3,150. Combined: $5,110. BCSO for one child at $5,110: approximately $1,040. Sarah’s share: $1,960 / $5,110 = 38.4%. Sarah’s obligation: 38.4% × $1,040 = $399.36. Since overnights are under 109, no adjustment. Sarah pays $399 per month. This shows a lower-income non-custodial parent with limited parenting time pays a smaller, straightforward amount.

Benefits of Using Child Support Calculator Sc

Using a dedicated Child Support Calculator SC offers numerous advantages for parents, attorneys, and mediators, transforming a complex legal and financial process into a manageable, data-driven task. This tool empowers users with transparency and accuracy, reducing conflict and promoting fair outcomes.

  • Instant and Accurate Estimates: Instead of manually calculating taxes, deductions, and schedule lookups, this tool does the math in seconds. It applies the exact South Carolina guidelines, including the shared parenting adjustment and proration of expenses, eliminating human error. This speed is invaluable during negotiations or when preparing for a court hearing.
  • Cost Savings on Legal Fees: Many family law attorneys charge hourly rates for document preparation and calculations. By using this calculator to get a preliminary figure, you can reduce the time your attorney spends on basic math, potentially saving hundreds of dollars. It also helps you enter mediation with a realistic number, avoiding unnecessary billable hours.
  • Improved Financial Planning: Knowing the estimated support amount allows both parents to budget effectively. The custodial parent can plan for housing, food, and education costs, while the non-custodial parent can adjust their monthly expenses accordingly. This prevents financial surprises after a court order is issued.
  • Transparency and Fairness: The calculator shows exactly how the support amount is derived, breaking down each parent’s income share and the impact of deductions. This transparency helps both parties understand the rationale behind the number, reducing suspicion and fostering a more cooperative co-parenting relationship.
  • Supports Mediation and Settlement: In mediation, having a neutral, third-party calculation tool helps both sides agree on a baseline. It provides a clear starting point for discussions about deviations (e.g., extraordinary medical expenses or private school tuition). This can accelerate settlements and reduce the emotional toll of litigation.

Tips and Tricks for Best Results

To maximize the accuracy and usefulness of your Child Support Calculator SC results, follow these expert tips and avoid common pitfalls. A small error in data entry can lead to a significant difference in the final support amount.

Pro Tips

  • Always use gross monthly income from the most recent three months of pay stubs, not annual projections. If income fluctuates (e.g., sales commissions), average the last six months. For self-employed individuals, use net profit from the most recent tax return, then add back depreciation and other non-cash deductions.
  • Double-check your tax withholding estimates. Use the IRS withholding tables or your actual tax returns to calculate federal and state taxes accurately. Overestimating taxes reduces your adjusted income and understates your support obligation, which can lead to legal issues later.
  • Include all mandatory retirement contributions, but not voluntary ones. South Carolina law only allows deductions for contributions required by your employer or by law (e.g., teacher retirement, military pension). Voluntary 401k contributions above a company match may not be deductible unless court-ordered.
  • When entering parenting time, count actual overnights, not just weekends. A typical Friday night to Sunday night is two overnights. Holidays, summer breaks, and school vacations must be included. Use a calendar to count precisely—this single input can change the support amount by 20% or more.

Common Mistakes to Avoid