How to File for Child Support: Step by Step
To file for child support, open a case with your state or tribal child support agency. You can apply through any local, state or tribal office, and anyone with custody of a child can sign up: a mom, a dad, a grandparent or a legal guardian. The agency can then find the other parent, establish paternity if it isn’t already legal, and get a support order set under your state’s guidelines. You don’t need a lawyer to start, and the federal program caps the application fee at $25. The details differ by state, so the steps below are the shared skeleton, with your state’s agency link at step one.
Every federal page here was loaded and read on October 15, 2026. The main source is the federal Office of Child Support Services’ How It Works guide, which notes that “procedures for states and tribes may be different.” This is not legal advice. If there’s an existing court case, a domestic violence concern or a parent in another country, talk to the agency or an attorney early.
Step 1: Find your state or tribal child support agency
Start with your own state’s agency, wherever the other parent lives. USAGov’s child support page says to “start with them regardless of where the parent lives.” It also clears up a common misunderstanding: “Federal and state governments do not pay child support.” They help you collect it from the other parent.
We keep every state’s official child support agency link in one table on the 50/50 custody and child support page. Use your state’s row. Ignore paid “filing services” that offer to submit the same free application for you.
Step 2: Open the case (online, by mail or in person)
The federal guide says you can sign up “through any local, state, or tribal child support office.” Who can apply:
- Custodial parents. The guide notes that although most custodial parents are mothers, “anyone with custody of a child can sign up for child support services.”
- Noncustodial parents can apply too, for example to establish legal parentage and keep an official record of payments.
- Families on TANF, Medicaid or federally assisted foster care may be referred to the program automatically. More on that below.
If you already have an attorney, the guide says your attorney and the agency should coordinate, so they don’t duplicate work or make conflicting enforcement decisions.
Step 3: Gather the documents (both lists)
The guide splits what the caseworker needs into two lists. The more you bring, the faster the case moves.
About you and your child:
- Your children’s birth certificates
- Any existing child support order, divorce decree or separation agreement
- Records of any child support you’ve already been paid
- Information about your income and assets
- Your child’s expenses, such as health care, daycare or special needs
About the other parent (as much as you have):
- Name and address
- Social Security number, which the guide says may appear on a driver’s license, marriage license, divorce record, support order, paternity acknowledgment or a joint tax return
- Current or recent employer
- Names of friends and relatives, and organizations they belong to (such as unions)
- Income and asset information (pay slips, tax returns, bank accounts)
- A physical description or photo
Don’t stall the application because you’re missing something. The guide describes State and Federal Parent Locator Services that check records such as motor vehicle, workforce and revenue agencies, and the National Directory of New Hires.
Step 4: Establish paternity, if it isn’t already legal
If you were married when the child was born, or the father signed an acknowledgment, this may already be done. Ask your caseworker. If not, the agency handles it. According to the guide:
- States let fathers voluntarily acknowledge paternity, with forms “available at the hospital or from the state vital records agency.”
- If paternity is disputed, the child and the alleged father take a DNA test at the request of either parent or the agency. If the state orders the test, it can charge the parties for it.
- The caseworker will ask whether the alleged parent ever supported or acknowledged the child, “through letters or gifts”, so keep those.
- If an alleged father ignores a properly served notice, a court may enter a default judgment establishing paternity, and a support order can follow.
The guide also lists what a child gains once parentage is legal, beyond support: inheritance rights, Social Security, veterans’ and life insurance benefits, and the father’s medical history.
Step 5: The support order is set (using your state’s guidelines)
The guide says all states have guidelines, and states must use them “unless it’s determined that doing so is not in the best interest of the child.” Some states use both parents’ incomes (an income-shares model) and others only the noncustodial parent’s (a percentage model). “Most states include the amount of time the child is in each parent’s home as part of the calculation.” So your custody schedule matters, and it’s why the parenting plan and the support order should be read side by side.
Two points from the guide that matter in practice:
- Most orders get paid through income withholding. Once the agency locates the other parent, “in most cases, they will locate the other parent’s employer and send an Income Withholding Order.”
- Cash and gifts outside the order usually don’t count. The guide says payments made outside the order “are, generally, not considered a credit” against it. If support is ordered, pay and receive it the way the order says.
What it costs (checked October 2026)
From the federal guide, checked October 2026:
| Cost | What the guide says |
|---|---|
| Application fee | ”Up to $25.” Some states absorb all or part of it, or collect it from the noncustodial parent. |
| Annual collection fee | $35 a year, charged after the state has collected and disbursed $550 in that year. The state decides which parent pays, or pays it itself. |
| Other possible costs (if you’re not on public assistance) | Agency attorney work, establishing parentage, locating the other parent. |
Your state’s agency can tell you which of these it actually charges.
If you’re on public assistance, or afraid of the other parent
If you receive TANF or certain other benefits, you may be required to cooperate with the child support program. The guide says any support collected goes either to you or to repay the state for your assistance. It’s also explicit that if cooperating could put you or your children at risk, “cooperation will not be required when a parent has good cause,” and that each state decides good cause differently. Raise it before the case opens.
Whether or not you’re on assistance, the guide describes safeguards: you can talk to the caseworker about not naming or locating the other parent, and a “family violence indicator” can be placed on your case to stop your information being released. It also warns that your address may still appear on court documents, so ask how it will be protected before you open the case. The National Domestic Violence Hotline is at thehotline.org.
After the order: changes and taxes
Orders don’t update themselves when income changes. Either parent can ask for a review at least every three years, or when circumstances change substantially. The modification guide walks through how. And for the IRS question everyone asks next, child support is neither taxable nor deductible.
FAQ: filing for child support
Do I need a lawyer to file for child support? No. The state agency’s services exist so parents can open a case without one. A lawyer can help if there’s a complicated custody case, a business-owner parent, or a cross-border situation.
Can I file for child support if we were never married? Yes. Paternity is established first, voluntarily or through the agency, and then the order follows.
Can I file if the other parent lives in another state? Yes. Start with your own state’s agency. USAGov says the federal Office of Child Support Services can help further with interstate cases.
What if the other parent has no job? The guide says establishing parentage and an order now “will make collecting child support a lot easier when they become employed later,” and that unemployment compensation can be used for child support.
