What child support is and who pays it

Child support is a court-ordered payment from one parent to the other, meant to cover the child's living expenses. The parent who pays is called the obligor; the parent who receives it is called the obligee. The amount is based on both parents' incomes, the custody arrangement, and state guidelines — not on what either parent thinks is fair.

Child support continues until the child turns 18 in most states, though some states extend it to 19 or 21 if the child is still in high school. It covers food, housing, clothing, education, and medical care. The paying parent does not lose the right to see the child, and the receiving parent cannot legally withhold visits as punishment for missed payments.

Either parent can request child support through the court, even if the parents were never married. If you receive public information (TANF, SNAP, or Medicaid), your state may pursue child support on your behalf and use part of the payment to reimburse the government.

Key Takeaways

  • Child support is calculated using your state's formula, which weighs both parents' income, custody time, and sometimes childcare costs — not what either parent wants to pay.
  • You can request child support through your local child support office, family court, or an attorney, and the process differs by whether the parents were married.
  • The court can enforce unpaid child support through wage garnishment, tax refund seizure, license suspension, and contempt charges if the obligor falls behind.
  • Either parent can ask the court to change the support amount if income, custody, or circumstances change significantly since the order was made.
  • Child support ends at the age set by your state, but unpaid arrears (back payments) remain owed and can be collected for years afterward.

How the amount is calculated

Every state uses a formula to calculate child support, but the formula itself varies. Most states use the income shares model, which adds both parents' incomes, looks up a table for the combined amount, and splits the result based on each parent's share of the total income. Some states use the percentage of income model, which takes a flat percentage of the obligor's income (often 17 to 25 percent for one child). A few states use the Melson formula, which accounts for basic needs, childcare, and standard of living.

The calculation starts with gross income — wages, salary, bonuses, self-employment income, rental income, and sometimes unemployment or disability benefits. Some income sources (like child support from another child, or means-tested benefits) are excluded. If a parent is intentionally underemployed, the court may "impute" income — assume they could earn more — and calculate support on that higher figure instead.

Custody time matters. If both parents share custody roughly equally, the obligor's support obligation usually drops. Childcare costs, health insurance premiums, and existing support orders for other children can also reduce the amount owed. Once the court sets the amount, it becomes a legal obligation; you cannot straightforward agree to pay less without a court order changing it.

Where to start if you need child support

Your first step depends on whether you want to establish support for the first time or change an existing order. If there is no current order, contact your local child support enforcement office — run by your state's Department of Human Services or equivalent agency. You can find it through your state's website or by calling 211. This service is free and does not require an attorney.

The child support office will locate the other parent, establish paternity if needed (through DNA testing if the parents were not married), and ask the court to set an amount. The process takes weeks to months. If you want faster results or have a more complex situation (high income, business ownership, assets), hiring a family law attorney may be worth the cost.

If an order already exists and you want to change it, you still start with the child support office or an attorney. You will need to show that circumstances have changed — a job loss, significant income increase, or change in custody — since the order was made. Without a material change, the court will not modify the amount.

What documents you will need

To establish or modify child support, gather proof of income for both parents. This includes recent pay stubs (usually the last two to four weeks), tax returns (typically the last two years), and W-2 forms. If you are self-employed, bring profit-and-loss statements or business tax returns. If you receive benefits, bring the award letter showing the monthly amount.

You will also need proof of custody or a birth certificate showing the child's age, and documentation of childcare costs if you pay for daycare or after-school care. If the other parent has a history of not paying support, bring records of missed payments or bounced checks. If you are requesting a change to an existing order, bring a copy of the current order itself.

If you use the child support office, they will request these documents from you and the other parent through formal paperwork. If you hire an attorney, they will tell you exactly what to bring to your first meeting. Do not delay gathering these — the faster you provide them, the faster the process moves.

How enforcement works when payments are missed

If the obligor falls behind on child support, the child support office can take action without you filing anything. Wage garnishment is the most common tool — the court orders the obligor's employer to send part of each paycheck directly to the state, which forwards it to you. The amount is limited by federal law (usually up to 50 to 65 percent of disposable income, depending on whether the obligor has other dependents).

If the obligor is self-employed or does not have a regular job, the state can intercept tax refunds, seize bank accounts, or place a lien on property. Professional licenses (driver's license, medical license, contractor's license) can be suspended. In serious cases, the obligor can be held in contempt of court, which can result in jail time — though this is usually a last resort and the obligor is often released once they pay what is owed.

Arrears (unpaid child support) accrue interest in most states and do not disappear when the child turns 18. The state can pursue collection for years, and the debt can affect the obligor's credit score. If you are owed back payments, ask the child support office about the current balance and what enforcement actions are underway.

Modifying an existing child support order

Child support orders are not permanent. Either parent can ask the court to change the amount if there has been a material change in circumstances — usually defined as a 10 to 15 percent change in income, a significant change in custody, or a major life event like job loss or remarriage. The burden is on the parent asking for the change to prove it.

If the obligor's income drops due to job loss, illness, or disability, they can request a reduction. If the obligee's income rises significantly, the obligor can request a reduction. If custody changes — for example, the child moves in with the obligor — the support amount will likely change. Remarriage alone does not change support, but a new child with another partner can reduce the obligor's obligation to the first child.

To modify an order, contact the child support office or an attorney and file a motion with the court. You will need to show recent income documentation and explain what has changed. The process is similar to establishing support the first time. If you cannot afford an attorney, ask the court about a fee waiver or contact your local legal aid office.

What happens when the child turns 18

Child support ends on the date set by your state — usually the child's 18th birthday, but sometimes 19 or 21 if the child is still in high school. The obligor's obligation stops automatically; you do not need to file paperwork to end it. However, any arrears (unpaid support from before that date) remain owed and do not disappear.

If the child is still in high school past age 18, support may continue until graduation or age 19, whichever comes first — but this varies by state. College expenses are generally not covered by child support unless the original order specifically includes them. Some states allow parents to agree to continue support through college, but the court will not order it unless both parents consent.

If the obligor owes back payments when the child turns 18, the state can continue collection efforts. These arrears can be pursued through wage garnishment, tax intercept, and other enforcement tools for years. The obligor's credit can be affected, and in some cases, a judgment lien can be placed on property.

Frequently Asked Questions

Can I get child support if the parents were never married?

Yes. If paternity is established (either through acknowledgment or DNA testing), child support can be ordered the same way as in a divorce. The child support office can help establish paternity at no cost. Without an established father, you cannot collect support from him.

What if the obligor lives in a different state?

The Uniform Interstate Family Support Act (UIFSA) allows states to enforce child support across state lines. Your child support office can work with the other state's office to locate the obligor, establish support, and collect payments. The process takes longer but works the same way.

Can child support be waived or forgiven?

Parents can agree to a different amount or even no support, but the agreement must be approved by the court. The court will not approve a waiver if it believes the child's needs will not be met. Once the court approves an agreement, it is binding and can only be changed through the modification process.

What if I cannot find the other parent?

The child support office has tools to locate parents — they can search employment records, tax records, and databases. If the obligor is truly missing, the court can still enter an order based on imputed income, and enforcement can begin if they are found later. Arrears will continue to accrue.

Does paying child support give me custody rights?

No. Child support and custody are separate. Paying support does not automatically give you visitation or custody rights, and not paying does not take them away. Custody is determined by what is in the child's best interest, regardless of support payments.