Yes, you can get child support if you were not married to the other parent. Federal law requires every state to have procedures for establishing parentage and enforcing financial support for children, whether or not the parents were ever married.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures The one extra step you face compared to married parents is proving who the child’s legal parents are. Once parentage is on the record, the process of calculating, collecting, and enforcing support works the same way it does for divorcing couples.
Establishing Legal Parentage First
No court will issue a child support order until legal parentage is established. Married couples get a legal presumption of parentage. Unmarried parents don’t, so they have to establish it through one of two paths.
Voluntary Acknowledgment of Paternity
The simplest route is a Voluntary Acknowledgment of Paternity, often called a VAP (some states have renamed it Voluntary Acknowledgment of Parentage). Federal law requires every state to offer a hospital-based program where parents can sign this document around the time of birth.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures If you miss that window, the form is available later through the state vital records agency. Before signing, both parents must receive notice of the legal consequences. A signed and filed VAP carries the same weight as a court order establishing parentage, so it’s not something to sign casually.
Court-Ordered Genetic Testing
When one parent disputes parentage, the matter moves to court or an administrative hearing. Either side can request genetic testing, and the state is required to order it. A cheek swab from the child and the alleged parent is enough. Federal law requires the state agency to cover the cost upfront, though states can recoup it from the father if parentage is confirmed.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures A legally admissible test typically costs between $350 and $1,500 depending on state and provider. If a parent refuses a court-ordered test, many states enter a default judgment establishing parentage anyway.
A Note for Same-Sex and Non-Biological Parents
The VAP was originally designed for biological fathers, and its availability for same-sex couples varies by state. For a non-biological parent in an unmarried same-sex couple, the most reliable way to lock in legal parentage is an adoption or parentage judgment from a court. A court order must be honored in every state under the U.S. Constitution’s full faith and credit clause, which makes it the strongest protection if the family later moves.
How To Open a Child Support Case
You don’t need a lawyer to get child support, though one can help in complicated cases. Every state runs a child support enforcement agency (sometimes called the IV-D agency, after the section of federal law that created it) that handles paternity establishment, support calculations, and enforcement, often at no cost to the custodial parent. Federal law requires states to make these services available to anyone who applies, not only to parents receiving public assistance.2Office of the Law Revision Counsel. 42 USC 654 – State Plan for Child and Spousal Support
The general process looks like this:
- Open a case with your state’s child support enforcement agency or file directly with the family court. The application asks for your financial details, the other parent’s information, and details about the child.
- If you don’t know where the other parent lives or works, the agency can use the Federal Parent Locator Service to track them down through tax records, employment databases, and other government sources.2Office of the Law Revision Counsel. 42 USC 654 – State Plan for Child and Spousal Support
- The other parent is formally notified through service of process by a neutral party, usually a process server or sheriff’s deputy. Fees run roughly $20 to $100.
- Some cases settle through mediation. If that fails, a judge decides based on the state’s guidelines and the financial evidence both sides present.
Filing fees vary. Some state agencies charge nothing; court filings can run up to several hundred dollars depending on the jurisdiction. Many states waive fees for parents with low income.
How the Support Amount Gets Calculated
Child support isn’t negotiated from scratch. Every state uses a formula, and the math is the same whether the parents were married or not. The most common approach, used in over 40 states, is the income shares model. It estimates what the parents would have spent on the child if they lived in the same household, then divides that figure between them in proportion to each parent’s earnings.
The calculation starts with both parents’ gross income (wages, salary, investment returns, and other earnings) and then adjusts for several things:
- Parenting time. The more overnights a child spends with a parent, the more the formula adjusts. A parent with 50/50 custody generally pays less than one with every-other-weekend visits.
- Health insurance. The cost of adding the child to a parent’s plan is factored in, and courts routinely require one or both parents to maintain coverage.
- Childcare and education. Daycare, after-school programs, and sometimes tuition get added to the base calculation.
- Extraordinary medical costs. Expenses not covered by insurance, such as dental work, therapy, or prescription medications, are typically split between parents.
A few states use the percentage-of-income model, which bases the obligation primarily on the paying parent’s income without combining both parents’ earnings. Most state court websites and child support agencies offer online calculators that let you plug in numbers and get a rough estimate before you file.
When the Other Parent Lives in Another State
If you and the other parent live in different states, the process gets more complicated but not impossible. The Uniform Interstate Family Support Act (UIFSA) governs these situations, and all 50 states, the District of Columbia, and U.S. territories have adopted it. Federal law ties states’ child support funding to UIFSA adoption.3U.S. Congress. Overview of the Current Child Support Enforcement (CSE) Program
Under UIFSA, you file in your home state and the paperwork is forwarded to the state where the other parent lives. Only one state at a time has authority over the support order, which prevents conflicting orders from stacking up. Your local child support agency coordinates with the other state’s agency on your behalf.
What Happens If the Other Parent Doesn’t Pay
Getting the order on paper is half the battle. The enforcement tools behind a child support order are aggressive, and they escalate quickly.
Automatic Wage Withholding
For most child support orders issued since 1994, income withholding kicks in automatically. The paying parent’s employer deducts the support amount from each paycheck before the parent ever sees the money.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures Federal law caps how much can be garnished at 50% of disposable earnings if the paying parent supports another spouse or child, and 60% if they don’t. If payments are more than 12 weeks overdue, those caps rise by an additional 5%.4Office of the Law Revision Counsel. 15 USC 1673 – Restriction on Garnishment
Tax Refund Intercept
State child support agencies submit information about parents with unpaid support to the federal Office of Child Support Services, which works with the U.S. Treasury to intercept part or all of the delinquent parent’s federal tax refund.5ACF. How Does a Federal Tax Refund Offset Work? The intercepted amount goes toward the outstanding balance. State tax refunds can also be seized in many states.
Passport Denial
Once a parent owes more than $2,500 in past-due support, the state agency can certify the debt to the federal government, which will deny or revoke the parent’s passport.6Office of the Law Revision Counsel. 42 USC 652 – Duties of Secretary The restriction isn’t lifted until the debt is fully paid or an approved payment arrangement is in place, and even then the process isn’t instant.
License Suspension
Federal law requires every state to have procedures for suspending the driver’s license, professional licenses, and recreational licenses of parents who owe overdue support or ignore subpoenas in child support cases.3U.S. Congress. Overview of the Current Child Support Enforcement (CSE) Program States must give notice before suspending, and the parent typically has 30 to 90 days to pay, enter a payment plan, or request a hearing. Losing a professional license can cost someone their career, which is why this tool works.
Contempt of Court
A parent who can pay but refuses to can be held in contempt of court. Penalties vary by state and can include fines and jail time. Courts treat this as a last resort, and a parent who genuinely cannot afford to pay has a defense. “I chose not to” isn’t one.
Changing the Order Later
Support orders aren’t permanent, but you have to go back to court or the child support agency for an official modification. Unilaterally paying less because you lost your job doesn’t count, and unpaid amounts keep accumulating as debt.
Federal law requires states to review child support orders at least every three years if either parent requests it. During a three-year review, no proof of changed circumstances is needed; the agency simply recalculates using current income and the state’s guidelines. States must notify parents of this right at least once every three years.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures
Outside that three-year window, you can still request a modification, but you need to show a substantial change in circumstances, such as:
- A meaningful income shift from job loss, a significant raise, disability, or retirement.
- A change in custody arrangements, like a child moving in primarily with the other parent.
- New medical costs, educational expenses, or a change in health insurance coverage.
Both parents submit updated financial information. The court recalculates under current guidelines and, if the new figure differs substantially from the existing order, issues a modified order going forward.
How Long Child Support Lasts
In most states, child support ends when the child turns 18. Some states set the age at 19 or 21, and a handful extend support through college under certain conditions. Support can also end early if the child becomes emancipated through marriage, military service, or a court order.
Courts in many states can order support to continue past the usual cutoff for an adult child with a disability that prevents self-support, as long as the condition existed before the child reached adulthood. Parents are also free to agree in writing to extend support, such as contributing to college tuition. If that agreement is incorporated into a court order, it becomes enforceable just like the original obligation.
Can You Get Support for Past Years?
If you waited months or years before filing, you may wonder whether you can recover anything for the period before you went to court. Many states allow retroactive support dating back to the date of filing, and some permit it going back further; in a few states, all the way to the child’s birth. The rules vary significantly by jurisdiction, and the amount is typically calculated based on what the guidelines would have required during the period in question.
The practical point: file as early as possible. Every month you wait is a month of support you may not be able to recover. Courts have limited power to reach backward and broad power going forward from the date you open a case.
Who Claims the Child on Taxes
Child support payments are tax-neutral. The parent paying can’t deduct them, and the parent receiving them doesn’t report them as income. Claiming the child as a dependent, though, matters a lot, and the IRS has specific rules for unmarried parents who live apart.
The default rule is that the custodial parent (the one the child lived with for more nights during the year) claims the child as a dependent. If the child spent an equal number of nights with each parent, the tiebreaker goes to the parent with the higher adjusted gross income. These tiebreaker rules apply specifically to parents who never married and lived apart for the last six months of the year.7IRS. Publication 501 (2025) – Dependents, Standard Deduction, and Filing Information Both parents cannot claim the same child, and if they try, the IRS applies the tiebreaker rules. Parents with multiple children can split who claims which child, but each individual child can only go on one return.
The custodial parent can voluntarily release their claim to the dependency and child tax credit by signing IRS Form 8332. The noncustodial parent then attaches that form to their tax return for each year they claim the child.8IRS. Form 8332 – Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent The release can cover the current year only or extend to future years. Some parents negotiate this as part of their support agreement, trading the tax benefit for a different support amount.
An unmarried parent who pays more than half the cost of maintaining a household where the child lives for over half the year can file as head of household, which comes with a larger standard deduction: $24,150 for 2026, compared to $16,150 for a single filer.9IRS. IRS Releases Tax Inflation Adjustments for Tax Year 2026 The parent who claims the child as a dependent can also claim the child tax credit, which is $2,200 per qualifying child for 2026. Together, these benefits can total thousands of dollars, which is why who claims the child often becomes a real financial negotiation between unmarried parents.