There is no single figure a father pays. The average child support payment reported to the U.S. Census Bureau is roughly $441 per month, but that average hides enormous variation from one case to the next.1U.S. Census Bureau. Child Support Received: 2021 How much a dad should pay for child support depends on his state’s guideline formula, his income (and usually the mother’s), how many overnights the child spends with him, and add-on costs like health insurance and childcare. A dad earning $60,000 in one state can owe a very different amount than a dad earning the same in the state next door.
Which Formula Your State Uses
Every state runs child support through a guideline, and there are three of them in use. Knowing which one applies to you tells you whether the mother’s income matters at all.
The Income Shares Model is used in 41 states plus Guam and the U.S. Virgin Islands.2National Conference of State Legislatures. Child Support Guideline Models It estimates what both parents would have spent on the child if they still lived together, then splits that cost in proportion to each parent’s share of the combined income. If you earn 65% of the total, you cover roughly 65% of the estimated cost. The custodial parent’s share is assumed to be spent directly on the child through housing, food, and daily expenses.
Six states — Alaska, Mississippi, Nevada, North Dakota, Texas, and Wisconsin — use the Percentage of Income Model, which looks only at the noncustodial parent’s earnings.2National Conference of State Legislatures. Child Support Guideline Models A flat or graduated percentage is applied based on the number of children. Percentages commonly run around 17% for one child and 25% for two, with more for additional children. The mother’s income doesn’t enter the calculation.
Three states — Delaware, Hawaii, and Montana — use the Melson Formula, a more involved version of income shares that first ensures each parent keeps enough income to cover their own basic living expenses before support is calculated.2National Conference of State Legislatures. Child Support Guideline Models
What Counts as Your Income
Income drives every formula, and courts define it broadly. Wages and salaries are the obvious pieces, but the definition sweeps in commissions, bonuses, self-employment profits, pension payments, rental income, and investment returns. Most states start with gross income rather than take-home pay, so voluntary retirement contributions and other elective deductions won’t shrink the number.
Government benefits are treated in specific ways. Social Security Disability Insurance counts as income in virtually every state, and SSDI can be garnished for unpaid support. Supplemental Security Income is different. Most states exclude SSI from the calculation because it’s needs-based, and federal law prohibits garnishing it. When a child receives auxiliary SSDI benefits because of a parent’s disability, some states credit those payments toward that parent’s obligation, which can lower the out-of-pocket amount.
Variable and Self-Employment Income
Courts don’t just grab your latest pay stub when earnings fluctuate. For self-employed parents, commission earners, or seasonal workers, judges typically average income over one to three years. That way a slow quarter doesn’t unfairly reduce the obligation and a banner year doesn’t inflate it beyond what you normally make.
Imputed Income If You’re Unemployed or Underemployed
A parent who quits, cuts hours, or takes a deliberate pay cut around the time of a support filing runs into imputed income. Instead of using actual earnings, the court assigns an income figure based on what the parent could reasonably earn given work history, education, skills, health, age, criminal record, and the local job market. Judges tend to be skeptical of sudden career changes that happen to coincide with a child support case.
What Pushes the Number Up or Down
Parenting Time
In most income-shares states, overnights matter. A parent who has the child 45% of the time is already covering a larger share of daily food, utilities, and transportation, and formulas build in an adjustment that reduces the noncustodial parent’s cash obligation as parenting time rises. In roughly equal time-sharing arrangements between parents with similar incomes, the support amount can drop significantly or approach zero.
Health Insurance and Medical Costs
Most orders require one or both parents to maintain the child’s health insurance. The cost of the child’s premium is typically added to the base support figure and split between the parents according to their income shares. Uninsured medical costs — copays, orthodontia, therapy, prescriptions — are generally divided the same way.
Childcare and Extraordinary Expenses
Work-related childcare (daycare, after-school programs, summer care) gets added on top of base support and split proportionally. So do extraordinary expenses the court finds reasonable and necessary, such as costs for a child with special needs, private school tuition where justified, or travel to make visitation work when parents live far apart. These add-ons can push the total meaningfully above what the base formula alone produces.
Low-Income Protections
The formulas aren’t designed to push a paying parent into poverty. Many states include a self-support reserve, a floor of income the paying parent keeps for their own basic needs before any obligation kicks in. That reserve is often tied to the federal poverty level for a single person. For a parent earning just above that threshold, the resulting order can be surprisingly small, because a parent who can’t feed themselves won’t reliably pay.
When a Judge Departs From the Formula
The guideline number is presumed correct, but a judge can deviate when applying it would be unjust. The court has to explain the reasoning in writing, and the deviation still has to serve the child’s best interest.
Reasons a court might order more than the guideline:
- A child with a disability or chronic medical condition that generates costs beyond what the formula accounts for.
- Unusually high travel costs when parents live far apart and the visitation schedule is expensive to maintain.
- Preserving a significantly higher standard of living the child previously enjoyed.
Downward deviations are less common but happen. A parent with unusually high income might convince the court that the guideline far exceeds what the child actually needs. Judges also sometimes approve a lower figure when parents have negotiated their own agreement and it still adequately supports the child. Other children the paying parent is legally obligated to support can also factor in.
How Long the Obligation Runs
In most states, child support runs until the child turns 18 or graduates from high school, whichever comes later. Several states extend it to 19 or 21, and a few allow courts to order continued support while a child is enrolled full-time in college. Support for a child with a significant physical or mental disability can last indefinitely if the child cannot become self-supporting.3National Conference of State Legislatures. Termination of Child Support
College costs are their own gray area. No federal law requires a parent to pay for higher education. Some states empower courts to order contributions toward college; others let parents fold college support into a custody agreement. Whether tuition, room and board, or other post-secondary expenses can be ordered depends entirely on your state.
How Taxes Affect What You Actually Pay
Child support is not tax-deductible for the paying parent, and the receiving parent does not report it as taxable income.4Internal Revenue Service. Alimony, Child Support, Court Awards, Damages Parents sometimes confuse child support with alimony, which had different tax rules before 2019. When working out what you can actually afford, start from your after-tax income, because the support payment itself won’t reduce your tax bill.5Internal Revenue Service. Publication 504 (2025), Divorced or Separated Individuals
Changing the Amount Later
A child support order isn’t permanent. Either parent can petition the court to modify it, but you need to show a substantial change in circumstances — not just a bad month. Qualifying events typically include a major job loss or promotion, a serious illness or disability affecting earning capacity, a significant change in parenting time, or a substantial shift in the child’s needs. Many states require the change to produce at least a 10–20% difference in the calculated amount before the court will modify the order. Some states also allow an administrative review every three years or so, even without a dramatic life change.
Timing matters. Most states won’t reduce the amount retroactively to before the date you filed your petition. Every month you wait with the old order in place is a month you owe the old amount, regardless of what your income actually is.
What Happens If You Don’t Pay
Enforcement is aggressive, and the consequences stack up fast.
Federal law allows up to 50% of your disposable earnings to be garnished for child support if you’re also supporting another spouse or child, and up to 60% if you’re not.6Office of the Law Revision Counsel. United States Code Title 15 – 1673 If you’re more than 12 weeks behind, those caps rise by 5%, up to 65%.7U.S. Department of Labor. Fact Sheet 30: Wage Garnishment Protections of the Consumer Credit Protection Act Disposable earnings means what’s left after legally required deductions like taxes and Social Security, not your take-home pay after voluntary deductions.
If you owe more than $2,500 in past-due support, the State Department can refuse to issue or renew your passport and can revoke an existing one.8Office of the Law Revision Counsel. United States Code Title 42 – 652 – Duties of Secretary States can also suspend your driver’s, professional, and recreational licenses, intercept tax refunds, place liens on real estate and personal property, seize bank accounts, and report the debt to credit bureaus. Most of these actions happen administratively, without a separate lawsuit.
Willfully failing to pay support for a child who lives in another state is a federal crime once the amount exceeds $5,000 or has gone unpaid for more than a year, with penalties escalating for larger or older debts.9Office of the Law Revision Counsel. United States Code Title 18 – 228 State-level contempt charges are more common and can also lead to jail time.
The obligation keeps accruing whether you can pay it or not. If your income drops, file for a modification right away. The parents who file promptly fare far better than the ones who let the debt pile up.