How to File for Child Support

Filing for child support typically involves submitting an application through your local child support enforcement agency or filing a petition with the family court in the county where the child lives. The process takes 30 to 90 days in most states, though contested cases can extend to 6 months or longer.

You can file for child support whether you were married to the other parent or not, and you do not need an attorney to start the process — though having one can help if the other parent contests the amount, disputes paternity, or lives in a different state. Here is a complete walkthrough of how to file for child support, what documents you need, and what to expect at each stage.

Step-by-Step Process for Filing Child Support

Step 1: Determine Where to File

You generally file in the county and state where the child lives. If you and the other parent live in different states, the Uniform Interstate Family Support Act (UIFSA) governs which state has jurisdiction. In most cases, it is the child’s home state — the state where the child has lived for the last 6 consecutive months.

There are two main paths to filing:

• Through the child support enforcement agency. Every state has a child support enforcement (CSE) office, often called the Office of Child Support Services, Division of Child Support, or similar name. You can apply through this agency regardless of your income. The agency will help establish paternity if needed, locate the other parent, and petition the court on your behalf. This service is either free or costs a nominal application fee (typically $20-$35).

• Through the family court directly. You or your attorney can file a petition for child support directly with the family court. This approach gives you more control over the timeline and process but involves court filing fees ($100-$350 depending on the state) and potentially attorney fees.

If child support is part of a divorce proceeding, it is typically addressed within that case rather than as a separate filing.

Step 2: Gather Required Documents

Having your documents organized before you file speeds up the process significantly. You will need:

About you (the custodial parent):

• Government-issued photo ID
• Social Security number
• Proof of income (pay stubs, tax returns, W-2s for the last 2 years)
• Proof of address
• Proof of child-related expenses (daycare costs, health insurance premiums, medical bills)

About the child:

• Birth certificate
• Social Security number
• Proof of school enrollment or daycare
• Medical insurance information
• Documentation of any special needs or extraordinary expenses

About the other parent (the noncustodial parent):

• Full legal name, date of birth, and Social Security number (if known)
• Last known address and employer
• Income information (if available)
• Photo (helpful for service of process if location is unknown)
• Vehicle information, relatives’ contact details, or other identifying information if the other parent’s whereabouts are unknown

Step 3: Submit the Application or Petition

If filing through the CSE agency: Complete the application form, which is available online or at your local office. Attach copies of your documents. Most states now allow online applications. After submission, a caseworker will be assigned to your case and will contact you within 10-20 business days.

If filing through family court: File a petition for child support (sometimes called a “complaint” or “motion”) with the clerk of court. You will pay the filing fee at this time, though fee waivers are available if your income is below certain thresholds. The court will issue a summons for the other parent.

Step 4: Serve the Other Parent

The other parent must be formally notified of the child support action. This is called “service of process.” Methods vary by state but typically include:

• Personal service by a process server or sheriff’s deputy
• Certified mail with return receipt
• Service through the other parent’s attorney (if they have one)

If the other parent cannot be located, the CSE agency can use its resources — including access to federal and state databases — to find them. In rare cases where the parent still cannot be found, courts may allow service by publication (a notice in a newspaper).

Step 5: Attend the Hearing

After the other parent has been served, the court will schedule a hearing. This typically occurs 30-60 days after service. At the hearing:

• Both parents may present evidence of their income and expenses
• The court will apply the state’s child support formula to calculate the amount
• The judge will issue a child support order specifying the monthly amount, payment method, and when payments begin

If the other parent does not appear, the court can enter a default order based on the information available — which often results in a higher amount because the absent parent’s income may be imputed at a higher level.

Establishing Paternity

If the parents were not married when the child was born, paternity must be established before a child support order can be issued. There are two ways to do this:

Voluntary acknowledgment. Both parents sign a Voluntary Acknowledgment of Paternity (VAP) form. This is often done at the hospital after birth but can be completed later at the vital records office or CSE agency. Once signed, it has the legal effect of a court order.

Court-ordered paternity testing. If the alleged father disputes paternity, the court can order DNA testing. Modern DNA tests are 99.9% accurate and typically involve a simple cheek swab. The test costs $200-$500, and the court may order the father to pay if paternity is confirmed. If he refuses to submit to testing, the court can enter a default judgment of paternity.

Establishing paternity does more than enable child support. It also gives the father legal rights to seek custody and visitation, and it gives the child access to the father’s medical history, inheritance rights, and benefits (Social Security, veterans’ benefits, health insurance).

What to Expect: Timelines

The timeline for getting a child support order varies based on whether the case is contested and whether paternity needs to be established:

Once the order is entered, payments typically begin within 30 days. Most states require payment through income withholding (wage garnishment from the noncustodial parent’s employer), which means the payment is deducted from the paycheck before the parent receives it.

How Child Support Amounts Are Calculated

Every state uses a formula to calculate child support, though the formulas differ. The three main models are:

• Income shares model (used by approximately 41 states): Calculates what both parents would have spent on the child if the family were intact, then divides that obligation between parents based on their proportional incomes.

• Percentage of income model (used by a handful of states including Wisconsin and Texas): Takes a flat percentage of the noncustodial parent’s income — typically 17-20% for one child, 25% for two, 30% for three.

• Melson formula (used by Delaware, Hawaii, and Montana): Similar to income shares but includes a self-support reserve for each parent.

Key factors in the calculation include:

• Both parents’ gross or net income
• Number of children
• Custody and parenting time split
• Cost of health insurance for the child
• Daycare or childcare expenses
• Any extraordinary expenses (special needs, medical costs)

You can estimate your potential support amount using our child support calculator.

Enforcement: What Happens If the Other Parent Does Not Pay

If the noncustodial parent fails to pay court-ordered child support, enforcement tools are available through both the CSE agency and the court:

Wage garnishment. The most common enforcement method. The employer withholds the support amount directly from the parent’s paycheck. This is automatic in most new orders.

Tax refund interception. The federal and state tax refunds of a parent who is behind on support can be seized and redirected to the custodial parent.

License suspension. States can suspend the delinquent parent’s driver’s license, professional licenses, and recreational licenses until arrears are addressed.

Credit reporting. Unpaid child support can be reported to credit bureaus, affecting the delinquent parent’s credit score and ability to obtain loans.

Passport denial. If arrears exceed $2,500, the federal government can deny or revoke the parent’s passport.

Contempt of court. The custodial parent can file a motion for contempt, which can result in fines, community service, or jail time for the delinquent parent. Jail is typically a last resort after other methods have failed.

Bank account levies and property liens. The CSE agency or court can seize funds from bank accounts or place liens on property owned by the delinquent parent.

Modifying a Child Support Order

Child support orders are not permanent. Either parent can request a modification when circumstances change significantly. Common grounds include:

• A substantial change in either parent’s income (job loss, significant raise, disability)
• A change in the custody or parenting time arrangement
• The child’s needs have changed (new medical condition, starting or ending daycare)
• A new child in either parent’s household
• Changes in health insurance costs

Most states allow modification reviews every 2-3 years even without a change in circumstances, and some CSE agencies will review orders automatically at set intervals.

To request a modification, you file a motion with the court that issued the original order or contact your CSE agency. The modification takes effect from the date the motion is filed — not retroactively — so it is important to file promptly when circumstances change.

What to Do Next

If you need to file for child support, here is how to get started.

1. Locate your state’s child support enforcement agency. Search for “[your state] child support services” to find the application portal and local office.
2. Gather your documents — income verification, child’s birth certificate, and any information you have about the other parent.
3. Estimate your potential support amount using our child support calculator.
4. Decide whether to file through the agency or court. The agency path is lower cost; the court path offers more control and may be faster.
5. Consult a family law attorney if the other parent is likely to contest, if paternity is disputed, or if the case involves parents in different states.

Schedule a free consultation to discuss your child support case with an experienced family law attorney.