If you get full custody, yes, you are entitled to child support from the other parent in nearly every case. Both parents share a legal duty to support their child financially, and when one parent houses the child day to day, the other parent contributes through court-ordered payments. The amount is set by a state formula based on both parents’ incomes, the child’s needs, and the visitation schedule, not by your financial need as the custodial parent.
Why Full Custody Triggers a Support Obligation
Custody and support are separate legal questions that work together. Custody decides where the child lives and who makes major decisions. Support decides how each parent pays. When you have sole physical custody, you already cover housing, food, utilities, and daily costs directly. The non-custodial parent’s share of those costs comes to you as a monthly payment.
You do not have to show financial hardship to receive support. The child has a right to be supported by both parents regardless of either parent’s wealth. Even a custodial parent with a comfortable income is entitled to a contribution from the other side. The one caveat is that if the non-custodial parent earns very little, the calculated amount will be small.
If parentage is disputed, the court will establish paternity or maternity first. Once that is settled, it moves to the dollar figure.
How the Payment Amount Is Calculated
Every state uses a legislative formula, and most follow one of two approaches.
Roughly 40 states use the Income Shares Model. It estimates what both parents would have spent on the child if the household were intact, then splits that figure in proportion to each parent’s income. If you earn 40% of the combined parental income and the other parent earns 60%, the other parent owes 60% of the child-rearing costs. Because you already spend your share directly as the custodial parent, the non-custodial parent pays the difference to you.
A smaller number of states use the Percentage of Income Model. That calculation looks only at the non-custodial parent’s earnings and applies a percentage that rises with the number of children covered. Your income is not part of the math.
Courts can deviate from the formula result up or down. A child with significant medical needs may justify a higher amount. A very high-income parent may trigger a downward deviation because plugging seven-figure earnings into the standard formula can produce absurd numbers. The goal is a figure that reflects what the child actually needs and what the parents can realistically pay.
When the Other Parent Is Unemployed or Underemployed
A non-custodial parent cannot avoid support by quitting a job or working below their capacity. If a court finds the parent voluntarily unemployed or underemployed, it can impute income based on education, work history, skills, and local wages. The parent asking for imputed income has to show the lack of earnings is voluntary. Genuine layoffs, disability, or caretaking a very young child from another relationship are defenses. Walking away from a $70,000 job is not.
Visitation Reduces the Payment in Many States
Even with sole custody, the other parent usually has scheduled visitation, and in many states the number of overnights the child spends there feeds into the formula. The reasoning is that a parent who has the child for 90 overnights a year is directly covering food and utilities during that time. More overnights with the non-custodial parent tends to mean a lower monthly payment. If your arrangement gives the other parent minimal or no visitation, the full weight of daily costs stays on your side and the calculation reflects that.
Health Insurance and Medical Costs
Child support orders almost always address health insurance. The court typically requires one parent to carry coverage for the child, and the cost of that coverage is folded into the support calculation. Which parent carries it depends on who has access to more affordable coverage, usually through an employer.
Out-of-pocket medical expenses that insurance doesn’t cover, like copays, deductibles, and uncovered treatments, are handled separately. The most common approach is a pro-rata split based on income. If you earn 35% of the combined parental income, you cover 35% of the uninsured medical bills. Some orders use a straight 50/50 split. A few states require the custodial parent to absorb a small initial threshold each year before the other parent’s share begins.
How to Open a Support Case
You can pursue a support order through your state’s child support agency or by filing a petition directly in family court. The state agency route is more common because it handles locating the other parent, establishing paternity if needed, and preparing paperwork. The federal Office of Child Support Enforcement oversees these state programs, and the application fee is capped at $25, though some states cover part or all of it.1Administration for Children and Families. Is There an Application Fee? The fee is waived if you receive Medicaid, foster care assistance, or TANF.
One thing to know about TANF: accepting those benefits means you assign your right to collect child support to the state, which then uses the collected support to reimburse itself. You won’t receive the payments directly until you leave TANF, though some jurisdictions pass through a small portion while you remain on assistance.
If the other parent lives in a different state, your order is still enforceable. The Uniform Interstate Family Support Act requires states to recognize and enforce support orders issued elsewhere, so a parent cannot escape the obligation by moving.2Legal Information Institute. Uniform Child Custody Jurisdiction and Enforcement Act (UCCJEA)
Taxes and the Dependency Claim
Child support is tax-neutral. You do not report it as income, and the paying parent cannot deduct it. Support payments do not count toward your gross income when you figure out whether you need to file a return.3Internal Revenue Service. Alimony, Child Support, Court Awards, Damages
As the custodial parent, you have the default right to claim your child as a dependent. The IRS defines the custodial parent as the one with whom the child lived for the greater number of nights during the year, which with full custody is almost certainly you.4Internal Revenue Service. Claiming a Child as a Dependent When Parents Are Divorced, Separated, or Live Apart Claiming the child unlocks the child tax credit, worth up to $2,200 per qualifying child under 17 for 2026, with up to $1,700 refundable even if you owe no federal income tax.
You can voluntarily release the claim to the other parent by signing IRS Form 8332, something that sometimes shows up as a negotiated term in a divorce agreement. The release can be revoked for future years with another Form 8332.5Internal Revenue Service. Form 8332 – Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent
Changing the Order Later
A support order is not permanent. Either parent can ask the court to modify the amount when circumstances change significantly. You have to file a formal request and show evidence; informal agreements between parents do not change the legal obligation, and the original amount stays enforceable until a judge signs a new order.
Courts commonly grant modifications for:
- A significant increase or decrease in either parent’s income. Many states require a 15 to 20% change before revisiting the order.
- Involuntary job loss or disability that reduces earning capacity.
- A real shift in parenting time, especially if the non-custodial parent begins exercising substantially more overnights.
- Changes in the child’s needs, such as new medical conditions or more expensive activities.
- An additional child in either parent’s household.
Modifications are not retroactive to the date circumstances changed. They take effect from the date you file the petition, so waiting months means losing those months of adjustment. File promptly when something changes.
Enforcement When the Other Parent Doesn’t Pay
State and federal law provide a range of collection tools. The main one is income withholding, where the payment is deducted from the non-custodial parent’s paycheck and sent to the state disbursement unit each pay cycle. Most new orders include automatic withholding from the start.6Administration for Children and Families. Income Withholding
When withholding isn’t enough or the parent is self-employed, federal law requires every state to maintain additional procedures:
- Federal and state tax refunds can be intercepted to cover overdue support.
- Driver’s, professional, and recreational licenses can be suspended, restricted, or withheld.
- Liens attach automatically to real and personal property, and courts can force a sale to satisfy the debt.
- Bank accounts and other financial assets can be attached and seized.
These remedies are codified in federal law and must be available in every state.7Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement
A parent who persistently refuses to pay can also be held in contempt of court, which carries fines and potential jail time. For interstate cases, federal criminal law adds another layer under 18 U.S.C. § 228, which makes it a crime to willfully fail to pay support for a child in another state if the debt has gone unpaid for more than a year or exceeds $5,000, with felony penalties for arrears over $10,000 or more than two years unpaid.8Office of the Law Revision Counsel. 18 USC 228 – Failure to Pay Legal Child Support Obligations
When Child Support Ends
In most states, support ends when the child turns 18. A handful set the age at 19, and a couple extend it to 21. Several common exceptions can push the obligation further:
- If the child is still in high school, many states continue support until graduation or age 19, whichever comes first.
- Some states allow courts to order post-secondary support, with cutoff ages ranging from 21 to 25.
- If a child cannot support themselves because of a physical or mental disability, the obligation can continue indefinitely in most states, lasting as long as the disability does.
Support also ends early if the child becomes legally emancipated through marriage, military enlistment, or a court order. Termination is not always automatic — some states require the paying parent to file a motion to end the order. Any unpaid arrears that accumulated before termination remain owed and collectible regardless of the child’s age.