USA Child Support Calculator

Estimate USA child support using the income shares model — guidelines vary by state across America.

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Free USA Child Support Calculator — State Guidelines

USA child support is determined by state-specific guidelines, with 41 states using the Income Shares Model (based on both parents combined income). The standard ranges from approximately 17% of non-custodial income for one child to 35% for five or more children in states using the Percentage of Income model. Child support in the United States is a legal obligation enforced by state child support agencies and the federal Office of Child Support Enforcement (OCSE). Payments are typically ordered until the child turns 18 (19 in some states). This calculator provides estimates based on common USA formulas — always verify with your state guidelines.

🇺🇸 How USA Child Support Works

Most USA states use one of three models: Income Shares (41 states — based on both parents combined income), Percentage of Income (9 states — based only on non-custodial parent income), or the Melson Formula (3 states — hybrid approach). The USA federal government requires all states to have child support guidelines and enforcement mechanisms. Support orders are legally binding and enforced through wage garnishment, tax refund intercept, credit reporting, and even jail time for willful non-payment.

✨ Key Features

Income Shares Model

Based on the model used by 41 USA states — calculates support from both parents combined income.

State Guidelines

Estimates based on common USA child support percentages. Actual amounts vary by state and judge discretion.

OCSE Standards

Aligned with USA Office of Child Support Enforcement federal guidelines and reporting requirements.

USA Child Support by Children

1 Child: ~17%

Most USA states set support at approximately 17-20% of the non-custodial parent gross or net income for one child.

2 Children: ~25%

Support increases to approximately 25% of income for two children in most USA jurisdictions.

3 Children: ~29%

Three children typically results in approximately 29-31% of income in USA child support guidelines.

Modifications

USA child support can be modified if there is a significant change in income (typically 15-20%+ change) or child needs.

Tips for USA Parents

USA child support calculations are based on gross income in most states — before taxes, not take-home pay.
Always get a formal USA court order — informal agreements are not legally enforceable and offer no protection.
Healthcare costs are typically split proportionally between USA parents in addition to base child support.
USA child support is NOT tax-deductible for the payer and NOT taxable income for the recipient (since 2019 TCJA changes).
Contact your state child support enforcement agency if payments are not being made — they can garnish wages, intercept tax refunds, and more.

❓ Frequently Asked Questions

How is USA child support calculated?
41 USA states use the Income Shares Model: both parents incomes are combined, a support amount is determined from a state schedule, and each parent pays their proportional share based on income percentage.
Can USA child support be modified?
Yes, if there is a substantial change in circumstances: significant income change (15-20%+), job loss, remarriage, or change in custody arrangement. Either parent can petition the USA court for modification.
What happens if I do not pay USA child support?
USA enforcement measures include: wage garnishment (up to 65%), tax refund seizure, credit reporting, passport denial, license suspension, and criminal contempt charges (possible jail time).
Until what age is USA child support paid?
Most USA states require child support until age 18, though some extend to 19 or 21 (especially if the child is still in high school or has special needs). College support is required in some states.