Basics

What Is Child Support?

A plain-English primer on what child support is, who pays it, what it covers, and how it differs from other family-law obligations.

Last updated: 2026-08-09

Child support is a court-ordered payment from one parent to the other to help cover the cost of raising a child after separation or divorce. It is not a penalty and it is not “alimony” — it exists to keep the child’s standard of living as close as possible to what it would have been if the parents lived together.

Who pays, and to whom?

The parent with less parenting time (the “obligor”) typically pays support to the parent with primary custody (the “obligee”). In shared-custody arrangements the amount is usually adjusted by how much time each parent has the child, but the obligation generally does not disappear.

What does it cover?

Housing, food, and clothing for the child
Health insurance and uninsured medical expenses
Child care so a parent can work or attend school
Educational expenses and, in some states, extracurricular activities

Child support is calculated by a formula set in each state’s guidelines — not by a judge’s mood. Start with your state’s calculator: pick your state to see the exact model that applies to you.

Every U.S. state uses one of three guideline structures (or a hybrid). Understanding which one your state uses explains why the same paycheck can produce very different numbers across state lines. See how the three models work

Is child support the same in every state?

No. Each state sets its own guideline formula, income definition, and schedule. That is why this site provides a separate, state-specific estimator for all 50 states and D.C.

Does child support end at 18?

Usually support continues to 18, but many states extend it to 19, 21, or through high school graduation. A few require support for a disabled child indefinitely. Check your state page for the controlling statute.

This article is general education, not legal or tax advice. For your exact number, open your state calculator.

Not legal or financial advice. This estimate follows the state’s statutory guideline formula but cannot capture every factor a court considers (health insurance, childcare, prior orders, deviations, imputed income).