Child support is money one parent pays to the other to help cover a child's living costs
Child support is a court-ordered payment from one parent to another. The parent who pays is usually the one who does not have primary custody. The payment goes toward food, housing, clothing, school costs, and medical care for the child. The amount is set by a judge or agreed to by both parents and written into a court order.
Child support is not optional — it is a legal obligation. If a parent stops paying, the other parent can ask the court to enforce the order. Enforcement can include wage garnishment (money taken directly from a paycheck), tax refund interception, or in serious cases, contempt of court charges.
The parent receiving support does not have to prove how the money is spent. It is assumed to go toward the child's needs. The parent paying does not get to decide which expenses it covers.
Key Takeaways
- Child support is set by a court order and is based on both parents' income, the amount of time each parent spends with the child, and state guidelines.
- The paying parent's obligation continues until the child reaches the age of majority in that state, usually 18, though some states extend it if the child is still in high school.
- If a parent's income changes significantly, either parent can ask the court to modify the order — but the old order stays in effect until a judge changes it.
- Unpaid child support can result in wage garnishment, driver's license suspension, and in some cases criminal charges for willful non-payment.
How a judge decides the amount
Every state has its own formula for calculating child support, called child support guidelines. The judge starts with both parents' gross income — wages, self-employment income, bonuses, and sometimes unemployment or disability benefits. The judge then applies the state's formula, which usually accounts for how much time the child spends with each parent.
Most states use an income shares model, which means the judge calculates what percentage of the combined household income each parent would have contributed if the family were still together, then assigns each parent their share of the child's costs. A few states use a percentage of income model, where the paying parent pays a set percentage of their income — for example, 17 percent for one child, 25 percent for two children.
The judge can also add costs on top of the base amount: health insurance premiums, unreimbursed medical expenses, childcare costs, and school tuition. These are called add-ons or extras. If one parent earns significantly more than the other, the judge may order additional support called deviation from the guideline amount.
When child support starts and stops
Child support usually begins on the date the court order is signed, not retroactively to when the parents separated. However, if one parent files a case months or years after the separation, the judge may order back support — payment for the time between separation and the filing date. The amount of back support varies by state and judge.
Support continues until the child reaches the age of majority in that state. In most states this is 18. In some states, if the child is still enrolled in high school at 18, support continues until graduation or age 19, whichever comes first. Some states extend support further if the child is in college, though this is less common and usually requires both parents to agree or a specific court order.
Support ends automatically on the date set in the order. The paying parent does not have to ask permission to stop paying. However, if the child is still in high school past age 18, the paying parent must prove the child is no longer enrolled before the court will terminate the order.
Modifying a child support order
Either parent can ask the court to change the amount if circumstances change significantly. Common reasons include a job loss, a major increase in income, a change in custody, or a change in the child's needs. The parent asking for the change must file a motion with the court and show that the change in circumstances is substantial — usually defined as a 10 to 15 percent change in income, though this varies by state.
Until the judge signs a new order, the old order stays in effect. This is important: if you stop paying because you lost your job, you are still legally in violation of the order. You must file the motion and get a judge's approval before the amount changes. If you wait to file until after you have missed payments, you may owe back support.
If the other parent refuses to agree to a modification, you can ask the court to hold a hearing. The judge will review both parents' current income, the custody arrangement, and any other relevant changes. The judge will then decide whether to modify the order and by how much.
What happens if a parent does not pay
If a parent falls behind on child support, the other parent can file a motion for enforcement. The court has several tools to collect unpaid support. The most common is wage garnishment, where money is taken directly from the paying parent's paycheck before they receive it. The employer is required by law to comply with the garnishment order.
Other enforcement methods include intercepting tax refunds, placing a lien on property, suspending a driver's license or professional license, and reporting the debt to credit agencies. In cases of willful non-payment — where a parent has the ability to pay but refuses — the court can hold the parent in contempt, which can result in fines or jail time.
The amount owed can grow quickly because most states charge interest on unpaid support. Some states also add collection fees. If a parent owes a large amount of back support, they may be required to pay a portion of current support plus an additional amount toward the arrears until the debt is paid off.
Child support and custody arrangements
Child support is separate from custody. A parent can have joint custody and still owe child support if their income is higher or if the child spends more time with the other parent. Conversely, a parent with full custody may still be ordered to pay support if the other parent has a significantly higher income and the child spends substantial time with that parent.
If custody changes — for example, if the child moves in with the other parent — either parent can ask the court to modify the support order. The new calculation will reflect the new custody arrangement. If the change is temporary (such as a child spending the summer with one parent), the support order usually does not change unless the arrangement becomes permanent.
A parent cannot withhold visitation because support is not being paid, and a parent cannot refuse to pay support because visitation is being denied. These are separate legal obligations. If either parent is violating their obligation, the other parent must go to court to enforce it.
Frequently Asked Questions
Does child support cover college expenses?
In most states, no. Child support ends when the child reaches the age of majority, usually 18, even if the child is in college. However, some states allow a judge to order support to continue if the child is still in high school past 18. A few states permit judges to order college support in limited circumstances, but this requires a specific court order and is not automatic.
What if the paying parent loses their job?
You must file a motion to modify the order with the court. Do not simply stop paying. If you wait to file until after you have missed payments, you will owe back support. File as soon as your income changes. The court may temporarily reduce or suspend support while you are unemployed, but only if a judge approves it in writing.
Can child support be forgiven or waived?
Only a judge can forgive or waive child support. The two parents cannot agree between themselves to cancel it. If both parents want to end support, they must file a joint motion with the court and the judge must approve it. The judge will consider the child's needs before agreeing.
What if the paying parent lives in a different state?
Child support orders are enforceable across state lines under federal law. The receiving parent can ask their state's child support enforcement agency to collect from the other state. The process is slower than in-state collection but is legal and regularly used.
Does child support stop if the child wants to live with the paying parent?
Not automatically. If the child moves in with the paying parent, that parent can file a motion to modify custody and support. The court will review the change and issue a new order. Until the judge signs the new order, the old support obligation remains in effect.