Child Support Calculator

Estimate child support payments using the income shares model based on both parents' income and custody split.

By Konstantin Iakovlev · Updated September 2026 · Source: New York Domestic Relations Law §240

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Total Annual Obligation

$34,600.00

Monthly Payment

$1,153.33

Paying Parent

Parent 2

Support Calculation

Combined Gross Income$100,000.00
Base Obligation Rate (2 children)25%
Base Support Obligation$25,000.00
+ Child Care Costs (annual)$6,000.00
+ Health Insurance (annual)$3,600.00
Total Obligation$34,600.00

Each Parent's Share

Parent 1 Income Share60.0%
Parent 1 Annual Obligation$20,760.00
Parent 2 Income Share40.0%
Parent 2 Annual Obligation$13,840.00
Paying ParentParent 2
Annual Payment to Other Parent$13,840.00
Monthly Payment$1,153.33
Per Child (annual)$17,300.00

Use the Child Support Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Most states size child support with an income shares schedule, but this calculator uses the simpler percentage-of-income method written into New York's Child Support Standards Act, Domestic Relations Law §240. It takes a fixed share of the parents' combined income for the number of children, adds child care and health insurance, and splits the total by each parent's share of income. That gives a quick, transparent estimate to anchor a negotiation, a mediation session or a household budget.

The schedule takes 17% of combined income for one child, 25% for two, 29% for three, 31% for four and 35% for five or more. Each parent owes their income share of the result, so the two shares always add up to the total. The parent who has the children less of the time pays their share to the other, whose own share is spent directly on the children; with equal time, the higher earner is treated as the paying parent.

Treat the result as an estimate. New York applies these percentages to adjusted income after certain deductions and uses discretion above a combined-income cap, and states on income shares use schedules whose percentage falls as income rises and that credit substantial shared parenting time. Child care is the cost most often underestimated. For a number you can file, have a family law attorney in your state run the official guideline.

Example: Two Children, Primary Custody with Parent A

  1. 1 Parent A earns $60,000 a year and Parent B $36,000. They have two children who live mainly with Parent A. Child care runs $800 a month and health insurance $150.
  2. 2 Combined income is $96,000. For two children the schedule takes 25%, a basic obligation of $24,000 a year. Adding child care ($9,600) and health insurance ($1,800) brings the total to $35,400.
  3. 3 Parent A earns 62.5% of the combined income and Parent B 37.5%, so Parent B's share is $35,400 × 37.5% = $13,275 a year and Parent A's is $22,125.
  4. 4 Parent B pays that share to Parent A: $13,275 a year, about $1,106 a month. Parent A's own share is spent directly on the children. A court applying another state's income shares schedule could reach a different figure.

Source: New York Domestic Relations Law §240 · Last updated: September 2026

Frequently Asked Questions

How is child support calculated?
Most states use an income shares schedule, which estimates what parents would have spent on the child if they lived together and divides it by each parent's share of income, with the percentage falling as income rises. This calculator uses New York's percentage-of-income schedule instead: 17% of combined income for one child, 25% for two, 29% for three, 31% for four and 35% for five or more, split by each parent's share of income.
Can child support be modified?
Yes. Either parent can request a modification if there is a substantial change in circumstances, such as a significant income change (increase or decrease), job loss, change in custody arrangement, or changes in the child's needs.
At what age does child support end?
In most states, child support ends at age 18 or high school graduation (whichever comes later). Some states extend support to age 19-21 or through college. Court orders may specify different end dates based on individual circumstances.

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