Income shares child support calculator

Used by 41 states. Combines both parents' gross monthly income to estimate the child-rearing obligation, then allocates it proportionally.

StateUses Income Shares model

Your state determines which calculation model applies.

Parent A monthly gross income

Parent B monthly gross income

Enter gross (before tax) monthly income for both parents. Include wages, salary, overtime, self-employment income, and regular bonuses.

Number of childrenParent A parenting time20%

Parent B: 80%

The percentage of overnights Parent A has per year. 50% = equal parenting time.

Estimated monthly child support

$850/month

Based on Florida's Income Shares guidelines

Based on income and parenting time, Parent A would likely pay Parent B approximately $850 per month.

Calculation breakdown

Combined monthly income$8,000
Basic support obligation$1,360
Parent A income share62.5%
Parent B income share37.5%
Parent A base obligation$850
Parenting time credit− $0
Add-ons (proportional share)+ $0
Final obligation$850

Annual support

$10,200

12-year projection (to age 18)

$122,400

Has your income changed significantly since your last order? You may qualify for a modification. See modification calculator →

This calculator provides estimates based on simplified state guideline formulas and does not account for all factors a court may consider. Actual orders depend on judicial discretion, income verification, imputed income, and case-specific factors no calculator can capture. This is not legal advice. Consult a licensed family law attorney in your state. Read full disclaimer.

How the income shares model works

Add both parents' gross monthly income to get combined income.
Look up the state's Schedule of Basic Child Support Obligations for that combined income and number of children.
Calculate each parent's share of combined income (Parent A income ÷ combined).
Multiply the basic obligation by each parent's share.
Apply a parenting time credit to the parent paying support if their overnights exceed the state threshold.
Add health insurance, childcare, and extraordinary medical add-ons proportionally.

States that use income shares

Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Florida, Georgia, Idaho, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Utah, Vermont, Virginia, Washington, West Virginia, Wyoming.