Yes, you can sue for back child support after your child turns 18. The unpaid balance, called arrears, remains a legally enforceable debt regardless of your child’s age, and most states give the custodial parent between 10 and 20 years after the child reaches adulthood to collect. A number of states set no deadline at all.
How Long You Have to Sue
Every state sets its own time limit for enforcing child support arrears, and those limits are far more generous than the ones that apply to ordinary debts. Depending on where you live, you may have 10 to 20 years after the child turns 18 to take action. Some states treat each missed payment as a separate judgment with its own 20-year enforcement window, which keeps very old arrears alive for decades.
A significant number of states impose no time limit whatsoever. In those places, the debt is enforceable for life. Check your state’s specific rule before you file, because the differences are large.
When you and the non-paying parent live in different states, federal law picks the deadline for you. The Full Faith and Credit for Child Support Orders Act tells courts to apply whichever state’s statute of limitations is longer, so you get the benefit of the more generous window.1Office of the Law Revision Counsel. 28 USC 1738B – Full Faith and Credit for Child Support Orders
Who Has the Right to File
The custodial parent, not the adult child, holds the right to pursue unpaid support. Court-ordered payments were meant to reimburse that parent for the cost of raising the child, so the debt is owed to the parent directly. The child’s age at the time of filing does not change who has standing.
If the custodial parent has died, the arrears become an asset of their estate, and the estate’s representative can file a claim during probate. A small number of jurisdictions let the adult child pursue the debt independently, usually only in narrow circumstances such as a disability that prevented them from becoming self-supporting.
Interest Can Double the Balance
Most states charge interest on overdue child support, and it grows faster than people expect. Rates run from about 2% to 12% per year depending on the state, and some states compound the interest, so you earn interest on previously accrued interest.2Justia. Georgia Code 7-4-12-1 – Interest on Child Support and Domestic Relations Orders
On a $30,000 balance, even a modest 6% rate adds $1,800 a year. At 10%, the same balance grows by $3,000 annually. After a decade, accrued interest can rival the original amount owed. This is a strong reason not to delay: the longer you wait, the more the total recovery grows, but so does the difficulty of locating assets.
Filing a Court Enforcement Action
The most direct route is a motion filed with the court that issued the original support order. It usually goes by “motion for enforcement” or “petition for contempt,” and it asks a judge to hold the non-paying parent accountable for violating the order. The clerk schedules a hearing once you file.
Before you file, gather the documents that will carry your case:
- The original support order and any modifications, which establish what was owed and when.
- Payment records: bank statements, receipts, or agency records showing which payments were made and which were missed.
- Information about the non-paying parent, including their last known address, employer, Social Security number, and anything you know about their income or assets.
- The child’s birth certificate.
At the hearing, the judge reviews the evidence, calculates the total arrears with any accrued interest, and decides on enforcement. Courts have broad authority. If the judge finds the failure to pay was willful, consequences can include wage garnishment, seizure of bank accounts, liens on property, suspension of driver’s and professional licenses, and, in serious cases, jail time for contempt.3Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement
Filing fees are typically modest, and some jurisdictions waive them for child support matters. If the non-paying parent has the ability to pay, the court can also order them to cover your attorney’s fees.
Using Your State’s Child Support Enforcement Agency
Every state runs a child support enforcement agency, and you do not need a lawyer to use one. These agencies provide services at little or no cost. After you open a case and turn in your documentation, the agency can locate the non-paying parent, verify their employment, and pursue collection through administrative tools that do not require a court appearance.4Administration for Children and Families. What Documents Do I Need to Bring to the Child Support Office
State agencies have access to enforcement mechanisms that are difficult for individuals to use on their own: automatic income withholding, interception of state tax refunds, credit bureau reporting, liens on real and personal property, and automated matches against the non-paying parent’s financial accounts.3Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement The agency route is often the better starting point if you cannot afford a private attorney, and the agency can escalate to federal tools when state-level pressure is not enough.
Federal Tools the Agency Can Trigger
When state collection stalls, several federal programs add pressure. They are usually triggered through the state agency rather than by you directly.
Federal Tax Refund Intercept
The Federal Tax Refund Offset Program lets the government seize the non-paying parent’s federal refund and redirect it toward arrears. A case qualifies once the arrears reach $500, or $150 if the custodial parent receives public assistance.5Administration for Children and Families. When Is a Child Support Case Eligible for the Federal Tax Refund Offset Program The offset runs automatically once the state agency certifies the case, and the non-paying parent gets notice of the amount taken.6Taxpayer Advocate Service. How to Prevent a Refund Offset
Passport Denial
Once arrears pass $2,500, the federal government can refuse to issue or renew the non-paying parent’s passport and can revoke one already in hand.7Office of the Law Revision Counsel. 42 USC 652 – Duties of Secretary
Garnishment of Wages and Federal Benefits
Social Security benefits are not protected from child support garnishment. Federal law allows up to 50% of the non-paying parent’s benefits to be taken if they support another spouse or child, and up to 60% if they do not. Both limits rise by 5 percentage points when arrears are more than 12 weeks old, reaching a maximum of 65%.8Social Security Administration. How Garnishment Withholding Is Calculated The same percentages apply to wage garnishment under the Consumer Credit Protection Act.9Office of the Law Revision Counsel. 15 USC 1673 – Restriction on Garnishment
Bankruptcy Will Not Wipe Out the Debt
A non-paying parent cannot discharge child support arrears in bankruptcy. Federal law treats child support as a domestic support obligation and specifically bars it from being wiped out in any chapter.10Office of the Law Revision Counsel. 11 USC 523 – Exceptions to Discharge
In a Chapter 7 case, other debts may be erased, but child support survives in full, and the automatic stay that halts most creditor collection does not stop child support enforcement. In a Chapter 13 case, the parent’s three-to-five-year repayment plan must include the arrears and pay them in full. Enforcement may pause while the plan runs, but the debt is never reduced or forgiven, and if the plan fails, collection resumes.
If the Non-Paying Parent Has Died
Arrears do not disappear when the non-paying parent dies. The unpaid balance becomes a debt of the estate, and you can file a claim during probate to collect it. Future support obligations generally end at death, but everything already owed remains collectible.
Estates pay debts in a priority order set by state law. Administration costs and funeral expenses usually come first, and child support arrears may rank below certain preferred creditors. If the estate cannot cover every debt, your claim may share proportionally with other creditors at the same level. The step you cannot miss is filing your claim within the deadline stated in the estate’s notice to creditors. Miss it and your claim can be barred, even though the underlying order was valid.
Tax Treatment of What You Collect
Back child support follows the same tax rules as regular child support. The money is not taxable income to the parent who receives it, and the parent who pays it cannot deduct it.11Internal Revenue Service. Dependents 6 – Filing Requirements, Status, Dependents That holds no matter how large the lump sum is. If you receive $50,000 in back support in a single year, none of it goes on your tax return.