Frequently Asked Questions

Child support is calculated using your state's statutory guidelines, which are based on one of three formula models: Income Shares (most states — both parents' incomes combined), Percentage of Income (Texas, Illinois, Wisconsin — fixed % of the non-custodial parent's income), or the Melson Formula (Delaware, Hawaii, Montana — complex hybrid). Each state has a specific worksheet and income schedule.

The Income Shares model (used in ~40 states) calculates child support by combining both parents' gross incomes to estimate total child-rearing costs. Each parent contributes proportionally to their share of the combined income. The custodial parent's share is presumed spent directly on the child; the non-custodial parent pays their share as a transfer payment.

The Percentage of Income model (used in states like Texas and Illinois) applies a fixed statutory percentage to the non-custodial parent's net income. In Texas: 20% for 1 child, 25% for 2 children, 30% for 3 children, 35% for 4, and 40% for 5 or more.

The calculator produces estimates using each state's published guideline percentages. Real child support orders involve precise financial disclosure, deductions for health insurance and childcare, adjustments for parenting time, and judicial discretion. Always treat calculator results as a starting point, not a final answer.

PlainChildSupport provides interactive calculators for the 10 largest states. All 50 states plus DC have guideline pages explaining the formula model used, key percentages, and links to official state resources.

Yes. Most states allow modification when circumstances change substantially (typically 15–20% change in income, or changes in custody). Each state has a specific modification threshold and process. Consult a family law attorney in your state for guidance on modification.

No. PlainChildSupport provides informational tools and publicly available guideline data only. This is not legal advice. Child support law is complex and varies by state and individual circumstance. Always consult a licensed family law attorney in your state before making legal decisions.