Child Support Calculator by State

Every state sets its own guideline formula, but they fall into three families. Income-shares states (the large majority, including California, Florida, Georgia, and Illinois) combine both parents' incomes, look up or compute a basic obligation, and split it in proportion to income. Percentage-of-obligor states like Texas apply a flat percentage to only the paying parent's income. New York's CSSA is a hybrid: fixed percentages applied to combined income, then split pro-rata. Parenting time adjusts the result in most states, each with its own formula.

It depends on the state. Texas, California, Florida, and Illinois work from net income (each defining deductions differently — Illinois even publishes a standardized gross-to-net table). Georgia uses gross income before taxes. New York uses gross income minus only FICA and NYC/Yonkers local tax — not federal or state income tax. Using the wrong income basis is the most common estimation error.

Equal time rarely means zero support — most formulas still transfer money from the higher earner. Florida applies a 1.5× gross-up cross-weighted by overnights once a parent has 20% of nights; Illinois has a similar formula at 146 overnights each; Georgia's 2026 rules weight court-ordered days by a 2.5 exponent; California bakes timeshare directly into its algebraic formula. Support generally reaches zero only when both time and incomes are close to equal.

No. They implement each state's published guideline formula, which is a rebuttable presumption — courts can deviate based on statutory factors like extraordinary expenses, a child's special needs, or high incomes. Use the results to understand the ballpark and the drivers, then verify with the state's official worksheet or a family-law attorney before relying on a number.

Twenty-six states so far, chosen by search demand: Texas (percentage of net resources), California (SB 343 formula), New York (CSSA percentages with the 2026 $193,000 cap), Florida (§61.30 schedule), Georgia (BCSO table plus the new 2026 parenting-time adjustment), Illinois (March 2026 income-shares tables), Indiana (weekly guideline schedule with a parenting time credit), Ohio (ODJFS basic schedule with the self-sufficiency reserve), Pennsylvania (2026 net-income schedule with the self-support reserve), New Jersey (September 2025 weekly schedule with sole and shared-parenting worksheets), Michigan (2025 Child Support Formula with the parental time offset), North Carolina (2023 guidelines schedule with primary and shared custody worksheets), Minnesota (2023 basic support table with the parenting expense adjustment), Oregon (OAR 137-050 scale with the parenting time credit formula), Virginia (2025 § 20-108.2 schedule with the shared custody worksheet), Maryland (2021 § 12-204 schedule with the shared physical custody adjustment), Utah (2023 base and low income tables with the joint physical custody formula), Louisiana (2025 R.S. 9:315.19 schedule with Worksheet B shared custody), Arkansas (2022 Administrative Order No. 10 income shares chart with the self-support reserve), Oklahoma (43 O.S. § 119 schedule with the parenting time adjustment), Arizona (2022 guidelines schedule with the Parenting Time Table), Tennessee (2021 Rule 1240-02-04 schedule with the variable parenting time credit), Wyoming (2023 § 20-2-304 net income tables with shared responsibility), Colorado (2026 HB25-1159 schedule with a parenting time credit from the first overnight), Wisconsin (DCF 150 percentage of income standard with shared placement and the 2026 low-income schedule), and South Carolina (2024 guidelines schedule with Worksheet C shared custody and the self-support reserve). Each state page documents its statute, current parameters, and effective dates. More states are on the way.