Child Support Guides
Every guide on this site in one place — how paternity gets established, how the guideline amount is calculated, how to request a modification, when support ends, and how interstate cases work. Each one links out to the state pages themselves so you're always working from the current information.
Establishing Paternity
How unmarried parents establish legal paternity in every state — the voluntary acknowledgment process, court-ordered genetic testing, and how long you have to rescind it.
Learn more →Calculator & Guidelines
See which calculation model your state uses — Income Shares, Percentage of Income, or the Melson Formula — with a link to your state's official guidelines.
Learn more →Modify an Order
See what counts as a substantial change and how to request a review of a child support order in your state.
Learn more →When Support Ends
Find the age child support ends in your state, and how high school enrollment, disability, or college can extend or shorten it.
Learn more →Interstate Cases
Understand how UIFSA governs jurisdiction, enforcement, and modification when parents live in different states.
Learn more →