Back child support is the running total of court-ordered payments a parent failed to make on time, commonly called arrears. Federal law treats each missed payment as a separate judgment that cannot be retroactively reduced or forgiven, and states have an unusually powerful set of tools to collect it — from paycheck garnishment and seized tax refunds to revoked passports, suspended licenses, and, in the worst cases, federal criminal charges. The obligation follows the parent across state lines, survives bankruptcy, and in many states can be enforced for decades after the child grows up.
How the Balance Grows
Arrears build any time the amount paid falls short of what the order requires. Job loss, a medical crisis, or a sharp income drop is the most common driver. Because support is tied to income, a shrinking paycheck creates an immediate mismatch with the order.
The legal fix is a formal modification, and the timing matters more than most parents realize. Courts can only change support going forward from the date the modification petition is filed. Every month that passes between the income drop and the filing locks in arrears at the original amount, even when the parent plainly couldn’t pay it. Filing starts the clock; it doesn’t rewind it.
Incarceration used to be treated in many states as voluntary unemployment, which meant support kept accruing at the pre-prison rate. Federal regulations now require states to let incarcerated parents seek a modification.1GovInfo. 45 CFR 302.56 – Guidelines for Setting Child Support Orders Even so, any arrears that piled up before the modification takes effect are still fully owed.
Interest
Most states charge interest on unpaid support. Rates run from about 2% per year on the low end to 10% or 12% on the high end, with a few states tying the rate to market factors and a few charging none at all. Over years of nonpayment, interest alone can add thousands to the balance, so where the order was issued matters a great deal.
Imputed Income
If a parent is unemployed or working well below capacity, a court can calculate support based on what the parent could earn rather than what they actually earn. Courts look at whether the underemployment is voluntary and whether there’s evidence of bad faith, such as quitting a good job or turning down reasonable work to shrink the obligation. A parent who genuinely cannot work due to a physical or mental condition, or who is caring for a very young child, usually won’t have income imputed to them.
How Enforcement Agencies Collect
Every state runs a Title IV-D child support program that a custodial parent can use to open an enforcement case. Non-assistance families pay a one-time application fee of up to $25; families receiving TANF are enrolled automatically.2Congress.gov. Child Support Services Annual User Fee: In Brief Once the case is open, the agency can tap federal and state databases to locate the other parent’s income and assets, then use the tools below. A private attorney isn’t required; some parents hire one for contempt hearings or complex interstate cases.
Wage and Benefit Garnishment
Income withholding is the primary collection method. A withholding order goes to the parent’s employer, who deducts support from each paycheck before the parent sees it.3Administration for Children & Families. Income Withholding The order reaches wages, commissions, bonuses, workers’ compensation, disability payments, and retirement income. A child support withholding order takes priority over almost every other garnishment, with a narrow exception for an IRS tax levy that predates the support order.
Federal law caps how much can come out of disposable earnings:
- 50% if the parent is supporting another spouse or child
- 60% if the parent is not supporting another spouse or child
- An extra 5% (so 55% or 65%) if the arrears are 12 or more weeks past due4Office of the Law Revision Counsel. 15 USC 1673 – Restriction on Garnishment
The same caps apply to Social Security benefits, so a parent on Social Security can lose up to 65% of the benefit to a support order.5SSA. How Garnishment Withholding Is Calculated
Tax Refund Interception
Federal tax refunds can be seized through the Treasury Offset Program. For most non-TANF cases the arrears have to be at least $500; where support has been assigned to the state because the custodial parent received public assistance, the threshold drops to $25.6eCFR. 31 CFR 285.3 – Offset of Tax Refund Payments to Collect Past-Due Support State tax refunds can be intercepted under parallel state programs.
Passport Denial
Owing $2,500 or more in past-due support triggers a report to the State Department, which will deny, revoke, or restrict the parent’s passport.7Administration for Children & Families. Passport Denial Program 101 The passport won’t be reissued until the debt is cleared or a payment arrangement is in place.
License Suspensions
States can suspend driver’s licenses, professional licenses, and recreational licenses for parents who fall behind. Most states act after roughly six months of nonpayment, though some move sooner. For parents who need a license to work or drive, the pressure is direct.
Contempt of Court
When other tools fail, the custodial parent or the agency can ask a court to hold the paying parent in contempt. The parent has to appear and explain the nonpayment. A court that finds willful refusal despite an ability to pay can impose fines, jail time, and the other side’s attorney fees. A no-show can be arrested on a bench warrant.
Federal Criminal Charges
Willfully failing to pay support for a child living in another state is a federal crime. It’s a misdemeanor punishable by up to six months in prison if the debt exceeds $5,000 or has been unpaid for more than a year, and a felony carrying up to two years if the debt exceeds $10,000 or has been unpaid for more than two years.8Office of the Law Revision Counsel. 18 USC 228 – Failure to Pay Legal Child Support Obligations Federal prosecutors don’t bring these cases routinely, but they’re a real risk when a parent crosses state lines to dodge a large obligation.
Options for a Parent Who Owes
Ignoring the debt is the worst move. A structured payment plan is the most common resolution: the court or agency sets a schedule covering current support plus an added monthly amount toward the arrears, sized to what the parent can realistically pay. Missing payments on that plan reopens the full enforcement toolkit.
A lump sum from an inheritance, settlement, or other windfall can wipe out the balance faster. In some situations, the parties can negotiate a compromise that clears the debt for less than the full amount. These reductions generally need court approval and usually apply only to arrears owed to the state from periods when the custodial parent received public assistance, not to arrears owed directly to the other parent.
Why Arrears Can’t Be Erased
The Bradley Amendment draws a hard line: once a child support payment comes due, no state can retroactively reduce or forgive it. Each missed payment becomes an automatic judgment with full legal force and is entitled to full faith and credit in every state, so a parent can’t shake it by moving.9Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement The one narrow crack is a pending modification: a court can adjust the amount back to the date the petition was filed and the other parent was notified, and no further.
Bankruptcy doesn’t help either. Federal law lists domestic support obligations as nondischargeable in both Chapter 7 and Chapter 13, and child support claims sit at the top of the priority list among unsecured debts.10Office of the Law Revision Counsel. 11 USC 523 – Exceptions to Discharge11Office of the Law Revision Counsel. 11 USC 507 – Priorities The automatic stay that halts other collection during a bankruptcy case doesn’t apply to support, so garnishment, tax intercepts, and contempt proceedings can continue.12Office of the Law Revision Counsel. 11 USC 362 – Automatic Stay Wiping out other debts in bankruptcy can free up income for support, but the support balance itself is untouchable.
How Long Collection Lasts
Statutes of limitations for collecting child support arrears vary widely. Many states set no time limit at all. Among those that do, the window generally runs 10 to 20 years after the child reaches the age of majority, which is 18 in most states and 21 in a few. Because each missed payment is a judgment, judgment-renewal procedures can stretch collection even longer in some places. Enforcement gets harder with time — a parent who relocates, changes jobs often, or hides assets is a tougher target — but harder isn’t the same as impossible, and federal parent locator services along with interstate compacts give agencies a long reach.
That reach extends abroad. The United States is a party to the Hague Convention on the International Recovery of Child Support, which provides a framework for locating parents, determining arrears, and enforcing support orders across member countries.13HCCH. Child Support Section International cases move more slowly, but wage garnishment, asset seizure, and passport restrictions all remain in play.
Taxes and Credit
Child support payments have no tax consequences on either side. The receiving parent doesn’t report them as income and the paying parent can’t deduct them, and that treatment applies to lump-sum payments of arrears as well.14Internal Revenue Service. Alimony, Child Support, Court Awards, Damages
Credit is a different story. Federal law requires state agencies to report delinquent parents and the amounts owed to consumer credit agencies, after giving notice and a chance to dispute.9Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement A support delinquency on a credit report can complicate renting an apartment, getting a car loan, or clearing an employment background check, and it stays there until the arrears are resolved.