Guides & Resources
Plain-language guides on child support calculations, modification procedures, and interstate rules across all 50 U.S. states, drawing on the U.S. Department of Health and Human Services Office of Child Support Enforcement (OCSE) FY2023 preliminary report covering more than 14,500,000 active Title IV-D cases. According to OCSE, federal performance measures include collection rate, paternity establishment rate, and orders-coverage share; see our methodology for the exact data vintage and how each guide is sourced.
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 (41 states), 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 are based on publicly available data from authoritative government sources. All statistics, ratings, and figures cited in these guides are drawn directly from official datasets and publications, with sources clearly referenced throughout.
We aim to present complex government data in plain language that is accessible to general audiences. When methodologies differ between data sources or change over time, we note these variations inline. Our editorial process includes regular reviews to ensure accuracy and timeliness of the information presented.