Who Is Legally Required to Pay Child Support

The parent without primary custody pays child support to the parent with primary custody

Child support is paid by the parent who does not have primary physical custody of the child to the parent who does. The court decides who pays based on custody arrangements, not on who is married to whom or whether both parents work. If parents share custody equally, the parent with the higher income typically pays the other parent, though the exact amount depends on state law and the specific custody split.

The obligation to pay child support exists separately from marriage, divorce, or custody status. A parent can be ordered to pay even if they never married the other parent, even if they have no contact with the child, and even if they did not want the child. The only way to end the obligation is through a court order — usually when the child turns 18, graduates high school, or reaches the age of majority in that state.

Key Takeaways

• The parent without primary physical custody pays child support to the parent with primary custody, regardless of marital status.
• Child support amounts are calculated using state formulas that consider both parents' incomes, custody time, and other factors that vary by state.
• A parent can be ordered to pay child support even if they never married the other parent or have no contact with the child.
• Child support obligations continue until the child reaches the age of majority in that state, usually 18 or after high school graduation.
• Either parent can ask the court to change the amount if income changes significantly or custody arrangements shift.

How courts determine which parent pays and how much

States use different formulas to calculate child support, but most follow one of three models: the income shares model, the percentage of income model, or the Melson formula. The income shares model (used in most states) adds both parents' incomes together, determines what percentage of that total each parent earns, and assigns each parent a share of the child support obligation based on that percentage. The percentage of income model takes a flat percentage of the paying parent's income. The Melson formula (used in Delaware, Hawaii, and Maryland) calculates basic child support, then adds costs for childcare and health insurance.

The court also considers how much time the child spends with each parent. If one parent has the child 80 percent of the time and the other 20 percent, the calculation reflects that split. Some states reduce the paying parent's obligation if they have significant parenting time. Income includes wages, salary, bonuses, self-employment income, rental income, and sometimes unemployment benefits or disability payments — the definition varies by state.

States set minimum and maximum income thresholds. If a parent's income is below the minimum (often $10,000 to $15,000 per year, though this varies), the court may still order a small amount or may use a different calculation. If income exceeds the maximum (often $150,000 to $250,000 annually), the court has discretion to calculate support on the excess income or to use a different approach.

When both parents have custody or earn similar incomes

If parents share custody equally — for example, alternating weeks or splitting the school year — the parent with the higher income usually pays the parent with the lower income. The amount is typically smaller than in cases where one parent has the child most of the time, because both parents are already covering living expenses when the child is with them.

Some states have a "credit" system: if the higher-earning parent spends 40 percent of the time with the child, they receive a credit against their support obligation equal to their share of the basic support amount. The remaining obligation goes to the lower-earning parent. Other states calculate the full obligation for both parents and then subtract one from the other to find the net amount owed.

If both parents earn nearly the same income and share custody equally, one parent may owe the other very little or nothing, depending on the state's formula and whether either parent pays for childcare, health insurance, or other costs.

Child support when parents never married

A parent can be ordered to pay child support even if they never married the other parent. The process usually begins when the custodial parent files a petition with the court or with the state's child support enforcement agency. The other parent is then notified and given a chance to respond.

If the parents agree on the amount, they can submit a written agreement to the court for approval. If they disagree, the court holds a hearing and makes a decision based on the state's child support formula. The court may also order a paternity test if the paying parent disputes being the biological parent.

Once the order is in place, the paying parent must follow it the same way they would if the parents had been married and divorced. Failure to pay can result in wage garnishment, tax refund interception, driver's license suspension, or contempt of court charges.

What happens if the paying parent's income changes

Either parent can ask the court to change the child support amount if income changes significantly. Most states allow a modification if income has changed by 10 percent or more, though the exact threshold varies. A job loss, promotion, disability, or retirement can all be grounds for a modification request.

The paying parent must file a motion with the court or contact the state's child support enforcement agency to request a change. straightforward stopping payments does not change the obligation — the parent still owes the full amount plus any arrears that accumulate. If the paying parent's income drops and they do not request a modification, they can be held responsible for the full original amount even though they cannot afford it.

The receiving parent can also request an increase if the paying parent's income rises. The court will review the new income and recalculate support using the state's formula.

Self-employed and irregular income

Parents who are self-employed, work on commission, or have irregular income must report their actual earnings. The court typically averages income over the past two or three years to account for fluctuations. If a parent's income varies significantly from month to month, the court may use a lower average or may order the parent to pay a base amount plus a percentage of income above a certain threshold.

Self-employed parents must provide tax returns, profit and loss statements, and sometimes bank records to prove their income. If a parent underreports income or claims losses to reduce their child support obligation, the other parent can challenge the figures in court. The court can also add back certain deductions or expenses if it finds they were claimed primarily to reduce support.

When child support ends

Child support obligations end when the child reaches the age of majority in that state, which is usually 18. In some states, support continues until the child graduates high school, even if that happens after age 18. A few states extend support to age 19 or 20 if the child is still in high school full-time.

Support also ends if the child joins the military, becomes emancipated (legally recognized as an adult before the age of majority), or dies. In some states, if the child is still in college after reaching the age of majority, the court may order continued support, but this is less common and depends on the state's law.

The paying parent must continue paying until the order is officially terminated by the court. straightforward stopping payments when the child turns 18 does not end the obligation if the state's law requires support to continue until high school graduation.

Frequently Asked Questions

Can a parent refuse to pay child support if they don't have a relationship with the child?

No. A parent's personal relationship with the child does not affect the legal obligation to pay child support. The court's focus is on the child's financial needs, not on whether the parents have contact or a good relationship. A parent who does not see the child still owes support.

What if the paying parent is unemployed or in prison?

If a parent is unemployed, they can request a modification of the support amount, but they must show they are actively looking for work. The court may set support at a minimal amount or may impute income (assign an income level based on their education and work history). If a parent is incarcerated, they still owe child support, and arrears accumulate during their time in prison. Some states allow a temporary reduction while the parent is incarcerated if they can show they have no income.

Can child support be waived if the paying parent cannot afford it?

A parent cannot straightforward waive or ignore child support because they cannot afford it. They must go to court and request a modification. The court will review their actual income and may lower the amount, but will not eliminate it unless there is a compelling reason. Even if the court reduces support, the parent still owes something based on the state's formula.

Does remarriage change who pays child support?

Remarriage does not change the child support obligation. A parent's new spouse's income is not counted toward child support, and the obligation does not transfer to the new spouse. However, if the paying parent's own income changes because of the remarriage (for example, they reduce work hours), they can request a modification based on their new income.

What if both parents want to change the child support amount?

If both parents agree to a different amount, they can submit a written agreement to the court. The court will review it to make sure the amount is reasonable and in the child's best interest. The court may approve it, reject it, or suggest changes. An agreement does not bypass the court — it still requires a judge's signature to be legally binding.