To put your baby’s father on child support, apply for services through your state or county child support agency under the federal Title IV-D program. If he isn’t already the legal father on the birth certificate, the agency will establish paternity first. From there, the agency locates him, serves him with notice, calculates the support amount, and sets up automatic withholding from his paycheck. The whole process usually takes a few months from application to first payment.
You can file whether or not you were ever married to him, whether or not he lives in your state, and whether or not you know where he works. The more information you bring, the faster it moves.
Establish Paternity First
A court can’t order anyone to pay child support until there’s a legal parent-child relationship on record. If you were married to the father when the child was born, most states automatically presume he’s the legal father and you can skip this step. If you weren’t, paternity has to be established one of two ways.
Voluntary Acknowledgment of Paternity
The simplest route is a Voluntary Acknowledgment of Paternity form that both parents sign. Hospitals offer it right after delivery, and you can also complete it later at your local vital records office. Once signed, it has the same legal weight as a court order establishing parentage.
One catch worth knowing: either parent can cancel a signed acknowledgment within 60 days. After that window closes, it can only be challenged by proving fraud, duress, or a material mistake of fact. File your support application promptly after signing so your case is already moving when that 60 days passes.
Court-Ordered Genetic Testing
If he refuses to sign, the child support agency will petition the court for genetic testing. It’s a cheek swab, no needles. Accredited labs treat a result above 99% probability as confirmation of paternity, and the court uses that result to issue a formal parentage order.
The agency typically fronts the cost of testing, which runs between $45 and $500 depending on the lab and jurisdiction, and many states recover it from the father once paternity is confirmed. You don’t arrange any of this yourself. The agency schedules the test and coordinates with the lab.
What to Gather Before You Apply
Walking into the child support office with the right information saves weeks of back-and-forth. The more you know about the father’s finances and whereabouts, the faster the agency can locate him and calculate an appropriate amount.
Bring as much of this as you can:
- About the father: full legal name, date of birth, Social Security number, current home address, employer name and address, and anything you know about his income like pay stubs or salary.
- About your child: a certified copy of the birth certificate and any existing custody or visitation orders.
- About your finances: recent pay stubs, tax returns, and information on your own income and assets.
Missing some of this is fine. The agency can still open your case without his Social Security number or employer, because they have access to federal and state databases that locate people and track employment. Having the information upfront just speeds things up.1Administration for Children and Families. What Documents Do I Need to Bring to the Child Support Office
If He’s Self-Employed
Proving income is harder when the father works for himself or does contract work. If you can get your hands on his past tax returns, 1099 forms, bank statements, business licenses, or records of assets like vehicles and property, bring copies. Courts can subpoena financial records later, but anything you provide early helps build a more accurate picture from the start. Judges know self-employed parents sometimes underreport, and they have tools to address it.
Filing the Application
You file through your state’s child support agency. It goes by different names depending on where you live, like the Division of Child Support or the Office of Child Support Services, usually sitting inside the Department of Human Services. The form is a Title IV-D application, named after the section of the Social Security Act that created the federal child support enforcement program.
Most states let you apply online through a secure portal, and you can also submit by mail or in person. If you’re already receiving TANF, Medicaid, or SNAP benefits, you may not need to apply at all. Your state is generally required to refer your case to the child support agency automatically as a condition of those benefits.
Fees
Federal law caps the application fee at $25 for parents who aren’t receiving public assistance.2Office of the Law Revision Counsel. 42 U.S. Code 654 – State Plan for Child and Spousal Support Some states charge less, and some waive it or pay it on your behalf.3Administration for Children and Families. Is There an Application Fee If you receive TANF or other qualifying public assistance, you won’t owe the fee.
There’s also a separate annual fee of $35 that kicks in once the agency has collected at least $550 on your behalf, but only if you’ve never received public assistance. The state takes it from collected support rather than billing you.2Office of the Law Revision Counsel. 42 U.S. Code 654 – State Plan for Child and Spousal Support
What Happens After You File
The agency assigns a case number and verifies your information. Then the father is served with legal notice that a child support action has been filed. A sheriff, process server, or certified mailing delivers the paperwork, which includes a deadline to respond, typically 20 to 30 days depending on your state.
If he doesn’t respond, the court can enter a default judgment based on the information in your application. If he does respond, the agency schedules a hearing or administrative conference where both parents present financial information and the support amount is determined. Expect a few months from start to first payment, sometimes faster if paternity is already established and he’s easy to locate.
How the Support Amount Gets Set
Every state uses its own child support guidelines, but they fall into two main approaches. Roughly 41 states use the Income Shares Model, which estimates what parents would have spent on the child if they lived together and then divides that cost based on each parent’s share of their combined income. The rest use a Percentage of Income Model, which looks only at the noncustodial parent’s earnings and applies a set percentage based on the number of children.
Under the percentage approach, a common benchmark is around 17% of income for one child and 25% for two, though exact figures vary by state. Whether the formula runs on gross or net income also depends on where you live. The calculation isn’t just base income, either. Courts typically add the cost of health insurance premiums for the child and work-related childcare to the base obligation, then split those costs between parents proportionally.
Shared Custody Adjustments
If the father has significant parenting time, usually above a threshold like 80 to 110 overnights a year, most states switch to a shared-custody formula that reduces the support amount. The logic is that a parent who has the child 40% of the time is already covering food, utilities, and daily expenses during those periods. When parenting time is close to 50/50 and both parents earn similar incomes, the support figure can shrink to very little or even zero.
If He’s Unemployed or Hiding Income
Judges aren’t required to accept a parent’s claim that they earn nothing. When a father is voluntarily unemployed or deliberately working below his capacity, courts can impute income, meaning they calculate support based on what he could reasonably earn given his education, work history, skills, and local job market. The same applies to self-employed fathers who underreport. Courts can examine bank deposits, spending patterns, and lifestyle to find a more realistic income figure. This is one of the most common disputes in child support cases, and it’s where documentation of his earning capacity matters.
Retroactive Support and Why Timing Matters
Can you get support for the time before you filed? That depends on your state. Some states allow retroactive support going back to the child’s date of birth, including prenatal medical expenses. Others only go back to the date you filed your petition. A few don’t allow retroactive support at all. The practical lesson: file as soon as you can. Every month you wait is potentially a month of support you can’t recover.
How You Receive Payments
Payments don’t come directly from the father to you. They flow through a centralized State Disbursement Unit, which tracks every dollar for legal documentation. You can typically choose direct deposit to your bank account or a state-issued debit card.
The main collection mechanism is an Income Withholding Order, which the agency sends directly to the father’s employer. The employer deducts the support amount from each paycheck, similar to tax withholding, and forwards it to the state agency for distribution to you.4Administration for Children and Families. Income Withholding This happens automatically in nearly all cases, even when he’s willing to pay voluntarily, because withholding is the most reliable method.
Federal law limits how much can be withheld. If he’s supporting another spouse or child, the cap is 50% of his disposable earnings. If he isn’t, the cap rises to 60%. An additional 5% can be withheld if he’s more than 12 weeks behind.5U.S. Department of Labor. Fact Sheet 30 – Wage Garnishment Protections of the Consumer Credit Protection Act
Enforcement When He Doesn’t Pay
If the father falls behind, you generally don’t need to chase him down yourself. The state child support agency has a broad set of enforcement tools, and they escalate as the unpaid balance grows.
- Tax refund intercept. The Treasury Offset Program can seize all or part of his federal tax refund to cover past-due support.6Bureau of the Fiscal Service. Treasury Offset Program – Child Support Program
- License suspension. States can suspend a driver’s license, professional license, or recreational license until he establishes a payment plan or catches up.
- Bank account seizure. Agencies can place liens on bank accounts and other assets.
- Credit reporting. Many states report past-due support to credit bureaus.
- Passport denial. Once past-due support reaches $2,500, the federal government will deny, revoke, or restrict his U.S. passport.7Administration for Children and Families. Passport Denial Program 101
Contempt of Court and Criminal Penalties
When a parent has the ability to pay and simply refuses, a judge can hold that parent in civil contempt of court. Contempt can result in jail time, with length varying by state. The threat alone is often enough to produce a payment plan, but judges do follow through in persistent cases.
At the federal level, willfully failing to pay support for a child living in another state is a crime if the debt exceeds $5,000 or has been unpaid for more than a year. A first offense carries up to six months in prison. Repeat offenses or debts above $10,000 can result in up to two years.8Office of the Law Revision Counsel. 18 U.S. Code 228 – Failure to Pay Legal Child Support Obligations Federal cases are rare and reserved for egregious situations, but enforcement actions for unpaid support don’t go away just because the child turns 18. The debt follows him until it’s paid.
If He Lives in Another State
The process still works. Every state has adopted the Uniform Interstate Family Support Act, which ensures only one support order is active at a time and that any state can enforce it. An Income Withholding Order is valid nationwide, so your state’s agency can send it directly to his out-of-state employer without opening a separate case where he lives.9Administration for Children and Families. Processing an Income Withholding Order or Notice If wage withholding alone isn’t enough, your agency can register the order in his state for full enforcement, giving that state’s agency power to pursue every remedy including license suspension and contempt.
Changing the Order Later
A support order isn’t permanent. Federal regulations require state agencies to review support orders at least every 36 months if either parent requests it, and the agency must notify both parents of this right every three years.10eCFR. 45 CFR 303.8 – Review and Adjustment of Child Support Orders
Outside the regular review cycle, either parent can request a modification by showing a substantial change in circumstances. Common qualifying changes include job loss, a serious medical condition, a significant increase or decrease in either parent’s income, or a major change in the child’s needs. The change usually needs to be lasting. Once a review is requested, the agency has 180 days to complete it and either adjust the order or confirm the current amount.10eCFR. 45 CFR 303.8 – Review and Adjustment of Child Support Orders Until a modification is officially entered, the existing order stays in effect.
When Child Support Ends
In most states, child support terminates when the child turns 18, though many states extend the obligation if the child is still in high school at that age. Some states set the default age at 19 or 21. A handful allow support to continue for children enrolled in college, and nearly every state requires ongoing support for adult children with significant disabilities who cannot support themselves. Support can also end early if the child is legally emancipated, joins the military, or gets married.
The order doesn’t automatically stop on the child’s birthday. In most jurisdictions, the paying parent needs to file a motion to formally terminate the obligation. Any unpaid balance that accumulated before the termination date remains owed and enforceable regardless of the child’s age.