Only 9 of 51 states publish verified calculators

Findings

9 verified calculator states cover the largest populations

PlainChildSupport verifies official calculators in 10 jurisdictions: California, Florida, Georgia, Illinois, Michigan, New York, North Carolina, Ohio, Pennsylvania and Texas. California holds 39 million residents, Texas counts 30 million, Florida totals 22 million across these 10 states. National Conference of State Legislatures, Child Support Guidelines by State The states table lists these 10 rows with a has_calculator flag. Nine of the ten apply Income Shares formulas (California, Florida, Georgia, Illinois, Michigan, New York, North Carolina, Ohio and Pennsylvania); only Texas is Percentage of Income. California's calculator page mirrors state math by combining parental incomes against the obligation table.

Texas is the ninth verified state and the only Percentage of Income model among the group, at a flat 20% rate. PlainChildSupport replicates Texas's calculation by applying its flat one-fifth-of-income rate to capped income. Texas verified calculator handles parenting-time credits that trigger at 40% overnights. Pennsylvania uses the Income Shares model, combining both parents' gross incomes to set the basic obligation. These 10 states account for $15.2 billion of the $26.4 billion distributed nationally in FY2023. Office of Child Support Enforcement, FY2023 Preliminary Data Report Georgia's calculator verifies against state agency pages with 40% overnights thresholds.

Michigan applies the Income Shares model using both parents' net incomes. New York state data confirms calculator outputs match official tables for combined incomes up to specified caps. North Carolina's implementation tests obligation schedules verbatim from state submissions. Ohio's verified calculator flags parenting-time adjustments at 40% overnights. State child support enforcement agencies, official calculator pages PlainChildSupport stores the verified formulas for these states, including each state's percentage rate and parenting-time threshold.

41 states leave parents with PDF worksheets or third-party estimators

Across the 51 jurisdictions, 41 lack a verified official calculator. This set spans 80.4% of US jurisdictions without verifiable online tools. Delaware, Hawaii, Montana form the 3 Melson formula states, all unverified. National Conference of State Legislatures, Child Support Guidelines by State Delaware's row links to Melson guidelines page with self-support-reserve calculations via worksheets. Hawaii requires manual math on downloadable forms.

Montana's Melson implementation demands parents compute reserve amounts from income columns without an online calculator. The unverified 41 include states beyond Melson users, forcing reliance on PDF interpretations. PlainChildSupport flags these rows with has_calculator=0 in the states table. State child support enforcement agencies, official calculator pages North Dakota appears in the unverified set alongside other Percentage of Income states. Wisconsin's row notes manual 17% computations from gross income without verification.

Mississippi lacks a verified tool, leaving residents to third-party estimates of uncertain accuracy. Nevada joins the 41 unverified with Percentage of Income math via worksheets. The All 51 jurisdictions page displays has_calculator flags for the 10 states against the 41 unverified. OCSS FY2023 data shows lower collection volumes across these 41 than the $15.2 billion distributed by the verified states. Office of Child Support Enforcement, FY2023 Preliminary Data Report Engineers reference state_fips columns to filter has_calculator availability across datasets.

Percentage of Income states: 1 verified (Texas), 4 unverified

Five jurisdictions use Percentage of Income formulas; only one of them, Texas, has a verified calculator, at a flat 20% rate. Texas verified calculator outputs match state agency pages for single-child obligations, with parenting-time credits at 40% overnights. State child support enforcement agencies, official calculator pages No other Percentage of Income state has a verified calculator in this dataset.

The 4 unverified Percentage-of-Income states are Nevada, Wisconsin, North Dakota, and Mississippi. Nevada requires manual percentage applications from worksheets without online verification. Wisconsin computes percentages from gross income manually. National Conference of State Legislatures, Child Support Guidelines by State North Dakota's row flags worksheet reliance for income percentages.

Mississippi joins Nevada, Wisconsin, North Dakota in the unverified set of 4 states. PlainChildSupport marks these with has_calculator=0 alongside formula_type as percentage_of_income. The 1 verified row enables pre-court estimates via official math, while the 4 unverified force PDF-based guesses. OCSE FY2023 report ties higher enforcement data to states like Texas with tools. Office of Child Support Enforcement, FY2023 Preliminary Data Report Formula_type columns distinguish these 5 from Income Shares or Melson across 51 jurisdictions.

PlainChildSupport's verified calculators cover 10 jurisdictions including the 1 Percentage-of-Income state, while 41 unverified states highlight the gap for 80.4% of areas. California, Texas and Florida lead population coverage at 39 million, 30 million and 22 million residents, in verified states that distributed $15.2 billion in FY2023. Texas provides the only Percentage of Income verified tool amid 5 total Percentage states, leaving Nevada, Wisconsin, North Dakota, Mississippi without verification. Parents in verified states access mirrored calculators for Income Shares tables or flat-percentage computations with 40% overnights triggers; the 41 others interpret worksheets manually before filings. National Conference of State Legislatures, Child Support Guidelines by State; Office of Child Support Enforcement, FY2023 Preliminary Data Report