Model potential monthly child support, alimony, and after-payment income using U.S. state guideline types and major-country support approaches. Adjust custody, income, expenses, and complex-scenario flags before you talk numbers.
Child support models
Most U.S. states use income shares, a few use percentage-of-income, and Delaware, Hawaii, and Montana use Melson-style calculations. Major countries often use agency tables or discretionary maintenance systems.
Maintenance factors
Need, ability to pay, marriage length, earning capacity, health, caregiving history, and marital standard of living can matter more than any quick formula screen.
Scenario planning
Shared custody, variable income, business income, imputed earnings, other children, and special-needs expenses all change the questions to ask before settlement.
Select a jurisdiction in the calculator for notes, official-source links, and model-specific screening logic. The cards below summarize the coverage included in this public planning tool.
Treat the number as a range starter. Run at least three scenarios: current income, conservative income, and disputed income. Then compare how parenting time, child care, health insurance, and extraordinary expenses move the outcome.