Understand the rule before the number
Use these explainers to identify your state’s formula, recognize the facts that can change an estimate, and find the official source behind it. They are educational resources, not legal advice.
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- practical guides
- 51
- jurisdictions covered
- 10
- interactive calculators
Download the child-support statistics extract cited on this page: child-support-statistics.csv (NCSL · OCSS · ACS · CC BY 4.0).
A better way to read an estimate
Every jurisdiction in our 51-jurisdiction dataset uses one of three formula families. A calculator can show a starting point, but the outcome can also turn on facts such as income treatment, parenting time, a requested deviation, or which state has authority.
According to PlainChildSupport's state guideline dataset and linked official materials.
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- formula families explained
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- guides for common decisions
- 51
- state and DC profiles
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- state calculators available
Interactive calculator coverage among 51 jurisdictions
Portal worksheets versus guideline-profile-only rows. Segments sum to the states table, a catalog shape, not the three formula-family explainers in the library below.
Choose a reading path
Move from the rule to the relevant question
The fastest route is usually to understand the formula first, then isolate the circumstance that makes your case different.
- Start with the formula Understand the model your state uses before comparing a percentage or estimate.
- Check the circumstances See how parenting time, income changes, deviations, and interstate rules can affect a guideline result.
- Plan the next step Use official state resources and qualified local advice before filing or relying on an estimate.
The guide library
Explore a specific child-support question
Child Support Deviation Factors by State, When Courts Can Adjust Guidelines
Judges can deviate from child support guideline amounts in specific circumstances. Learn what deviation factors each state allows and how they affect calculations.
Child Support Formulas Explained: Income Shares vs Percentage vs Melson
Understand the three child support calculation models used across the US: Income Shares, Percentage of Income, and the Melson Formula.
How to Modify a Child Support Order, Substantial Change of Circumstances
Learn when and how to modify a child support order. Includes what qualifies as a substantial change of circumstances in each state.
Understanding Imputed Income in Child Support Calculations
Courts can assign income to a parent who is voluntarily unemployed or underemployed. Learn how imputed income works and when it applies.
Interstate Child Support: UIFSA Explained, When Parents Live in Different States
The Uniform Interstate Family Support Act (UIFSA) determines which state has jurisdiction over child support when parents live in different states.
Child Support Enforcement: How States Collect Unpaid Support
Title IV-D agencies use wage withholding, tax-refund intercepts, license suspension, and other tools to collect unpaid child support. Learn how enforcement works.
State Child Support Guidelines Compared
Percentages alone do not determine the dollar amount owed. Learn how Income Shares, Percentage of Income, and Melson Formula states actually compare.
Methodology
Our guides combine publicly available state guideline materials with federal child-support context. We distinguish an estimate or explanatory comparison from a legal conclusion, and link to the relevant official source wherever the underlying material is available.
State rules and procedures can change. For the data vintage, source notes, and limits of this reference, see our methodology before relying on a result.
The figures in this article come from our state-guideline and federal enforcement tables; the explanation around them is written prose rather than database output. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Our database was last rebuilt on 2026-09-09.
PlainChildSupport publishes state guideline data and federal enforcement statistics for informational purposes only. It is not legal or financial advice, a calculator result is not an order, and every state allows deviations a court decides case by case, so confirm any figure with the state child-support agency or an attorney before you rely on it. Appropriate use.