Child support calculations differ by state, but most states use some version of an income-based formula that accounts for both parents' earnings and the amount of parenting time each has.
Common approaches
- Income shares model: estimates what the child would have received if the household stayed together, then divides that amount between parents based on income.
- Percentage of income model: sets support as a percentage of the paying parent's income, sometimes adjusted for the number of children.
- Melson formula: used in a small number of states, a more detailed variation that also accounts for each parent's basic needs.
Factors that commonly affect the number
Beyond base income, courts often consider health insurance costs, childcare expenses, the parenting time schedule, and, in some cases, extraordinary medical or educational expenses.
Where to get a real number
Many state court websites publish official child support calculators or worksheets. These give a useful estimate, but a family law attorney can help you understand how your specific facts, including any deviations from the standard formula, are likely to apply.
This is general information, not legal advice. Child support rules vary significantly by state.