Modification
Child support modification calculator
Estimate whether a change in circumstances likely justifies modifying your existing order.
Estimated new support amount
$640
Most states require a substantial change in circumstances — typically a 10–15% difference in the support amount — to grant a modification. Reason: income.
Child Support Calculators for All 50 States
Select your state for 2026 child support guidelines, calculation model, and an instant monthly estimate.
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Frequently asked questions
What qualifies as a substantial change in circumstances?+
Most states require a 10–15% difference between the current order and what a new calculation would produce, often combined with a meaningful change in income, custody, employment, or the child's needs.
How often can I modify a child support order?+
Many states allow review every three years without showing a change, or sooner if there is a substantial change in circumstances. Check your state's specific rule.
Will losing my job automatically lower my child support?+
No. The order remains in effect until a court modifies it. File for modification as soon as possible — arrears continue to accrue under the old amount until the modification is granted.
Does a new child from another relationship reduce my obligation?+
Some states allow a credit for additional dependents. The credit is usually smaller than a first-family obligation and varies widely by state.
Can parents agree to modify support without going to court?+
Informal agreements are not legally enforceable. Always file the modification with the court so the new amount is on the official order.