Child support is calculated using state-specific formulas based primarily on parents' incomes and the custody arrangement. Most states use either the "Income Shares" model (both parents' incomes combined) or "Percentage of Income" model (non-custodial parent's income only). The amount typically covers basic needs like housing, food, clothing, healthcare, and education expenses.
Last updated: February 2026 • Reviewed by Divorce.law Legal Team
Combines both parents' incomes to determine total support obligation, then divides it proportionally based on each parent's share of combined income.
Example Calculation:
Applies a flat percentage of the non-custodial parent's income. Simpler but doesn't account for custodial parent's income.
Typical Percentages:
A more complex version of income shares that first ensures each parent's basic needs are met before calculating support.
Key Features:
Child support calculations use "gross income" from all sources, not just wages. Courts look at the full financial picture.
If a parent is voluntarily unemployed or underemployed, courts may "impute" income—calculating support based on what they could earn, not what they actually earn.
Child support orders can be modified when circumstances substantially change. Either parent can request a modification.
Tip: Most states require a change of 15-20% or more before they'll modify support. You cannot modify support retroactively—changes apply from the filing date forward.
Each state has its own guidelines and calculator. Victoria AI uses your state's official formula to estimate your child support obligation.
View your state's child support guidelinesVictoria AI uses your state's official guidelines to estimate child support. Get personalized calculations based on your specific situation.