Definition
Child support is a court-ordered, recurring payment that one parent makes to the other to help cover the financial needs of their shared minor child. It is calculated using state guidelines that consider both parents' incomes, the number of children, and the parenting arrangement. The obligation belongs to the child, not the parent, and generally continues until the child reaches adulthood.
Legal Meaning
Child support is the legal duty of parents to financially provide for their children, whether or not the parents ever married. When parents separate or divorce, or in a paternity case, a court issues a support order requiring the parent with less parenting time (or the higher-earning parent) to make regular payments to the other parent or caregiver.
Child support is governed by state law, and every state has adopted child support guidelines that produce a presumptive amount based on a formula. Most states use the income shares model, which estimates the total amount parents would spend on the child if living together and divides it between them in proportion to income. A minority of states use a percentage-of-income model focused on the paying parent's earnings. Courts can deviate from the guideline amount in some circumstances, but they must usually explain why.
Support is closely linked to, but separate from, child custody: the amount of parenting time each parent has often affects the calculation. To learn more about how these issues fit together, see our family law practice area and our child custody laws by state guide.
Key Points
- Child support is a legal obligation owed to the child, not a personal debt between parents
- Every state has guidelines that set a presumptive support amount using a formula
- Most states use the income shares model; some use a percentage-of-income model
- Income, number of children, parenting time, health insurance, and child care all affect the amount
- Support is separate from custody, though parenting time influences the calculation
- Support usually lasts until the age of majority or high school graduation, with state variation
- Orders can be modified after a substantial change in circumstances
- Unpaid support (arrears) can be enforced through wage garnishment, license suspension, and more
Real-World Example
After their split, Priya and Tom share custody of their two children, with the kids living primarily with Priya. Their state uses the income shares model. Priya earns $45,000 a year and Tom earns $75,000, so Tom is responsible for a larger share of the children's estimated needs.
Using the state guideline calculator, the court determines a base support figure for two children, then adjusts it for the parenting schedule and adds amounts for the children's health insurance premiums and after-school care. The result is a monthly child support payment that Tom pays to Priya. If Tom later loses his job or the parenting schedule changes substantially, either parent can ask the court to recalculate the amount.
Common Child Support Calculation Models
| Model | How It Works | Key Inputs |
|---|---|---|
| Income Shares | Estimates total spending on the child if parents lived together, then splits it by income share | Both parents' incomes, number of children, parenting time |
| Percentage of Income | Applies a set percentage to the paying parent's income | Paying parent's income, number of children |
| Melson Formula | A more detailed variation that reserves a self-support amount for each parent before allocating support | Both parents' incomes, basic needs, number of children |
| Add-On Expenses | Extra costs added on top of the base support figure | Health insurance, uninsured medical costs, child care |
What Child Support Covers and How Long It Lasts
Child support is meant to help with a child's overall needs rather than to reimburse specific purchases. It generally contributes toward:
- Food, housing, and utilities
- Clothing and everyday essentials
- Education and school-related costs
- Health insurance and uninsured medical expenses (often addressed separately)
- Child care and, in some states, extracurricular activities
Support typically continues until the child reaches the age of majority (18 in most states), and many states extend it through high school graduation. Some states allow support to continue for college expenses or for an adult child with a disability, while emancipation can end it early. The exact rules vary by state.
Enforcing and Modifying Support
When a parent falls behind, the unpaid amount is called arrears. State child support enforcement agencies and courts have powerful tools to collect it, including wage garnishment, intercepting tax refunds, suspending driver's and professional licenses, placing liens on property, reporting to credit bureaus, and holding a parent in contempt of court. Notably, child support debt generally cannot be wiped out in Chapter 7 bankruptcy.
To modify an order, a parent must usually show a substantial change in circumstances, such as a significant income change, a new parenting schedule, or a change in the child's needs. Either parent can request a review through the court or the state agency.
Related Terms
Questions About Child Support?
Learn how support is calculated in your state and connect with a family law attorney who can help you establish, enforce, or modify an order.
Explore Family LawWhen You Need a Lawyer
You may benefit from a family law attorney's help if:
- You are establishing support for the first time, especially in a paternity case
- You believe the other parent is hiding income or is underemployed on purpose
- Your income or the parenting schedule has changed and you need a modification
- You are owed significant arrears and need to enforce the order
- You are facing enforcement actions like wage garnishment or a contempt motion
- Your case crosses state lines
An attorney can run the guideline calculation correctly, argue for or against deviations, and protect your interests in enforcement or modification proceedings. For help with costs and choosing counsel, see understanding legal fees and how to choose a lawyer.
Frequently Asked Questions
How is child support calculated?
Every state uses its own child support guidelines to calculate payments. Most states use an income shares model, which estimates what the parents would have spent on the child together and divides that obligation in proportion to each parent's income. Other states use a percentage-of-income model based mainly on the paying parent's income. Guidelines typically factor in each parent's income, the number of children, parenting time, and costs like health insurance and child care.
What does child support cover?
Child support is intended to cover a child's basic needs, including food, housing, clothing, education, and everyday expenses. Many orders also address health insurance, uninsured medical costs, and child care. It is meant to maintain the child's standard of living and ensure both parents contribute to the child's upbringing, not to be an itemized reimbursement for specific purchases.
How long does child support last?
Child support typically continues until the child reaches the age of majority, which is 18 in most states, though many states extend it until the child graduates from high school. Some states allow or require support to continue for college or for a child with a disability. Support can also end early if the child becomes emancipated. Because the rules vary by state, check your state's law for the exact terms.
Can child support be modified?
Yes. A child support order can be modified when there is a substantial change in circumstances, such as a significant change in either parent's income, a change in the parenting schedule, or a change in the child's needs. Either parent can ask the court or the state child support agency to review and adjust the order. Until a court changes the order, the existing amount remains legally due.
What happens if a parent does not pay child support?
Unpaid child support, called arrears, can be enforced through several tools. State child support agencies and courts can garnish wages, intercept tax refunds, suspend driver's or professional licenses, place liens on property, report the debt to credit bureaus, and in serious cases hold the parent in contempt of court. Child support debt generally cannot be discharged in bankruptcy and continues to accrue interest in many states.
State-Specific Information
Child support guidelines, the duration of support, and enforcement tools vary significantly by state. For more on related family law rules, see our comprehensive guides: