Typical Child Support Amounts: Formulas, Custody, and Add-Ons

Typical child support amounts in the United States run roughly $400 to $530 per month. The most recent Census Bureau data put the median annual order at $4,816, or about $401 per month, and the mean at $6,390, or about $533 per month.¹ Those are the numbers courts ordered. Actual collections averaged $4,106 per year, so what shows up in a bank account is often less than what a judgment says.

The spread around those averages is wide because every order is built from the same ingredients in different proportions: each parent’s income, the number of children, how custody time is divided, and the formula your state applies.

Which Formula Your State Uses

Federal law requires every state to publish child support guidelines that produce a presumptively correct dollar figure for each case. A judge can go higher or lower, but only with written findings explaining why the guideline amount would be unjust.² The formula is doing most of the work in most cases.

Income Shares (41 states)

Forty-one states use the Income Shares Model.³ The court estimates what the parents would have spent on the child if the household were still intact, then splits that estimated cost in proportion to each parent’s share of combined income. If you bring in 65% of the combined gross, you cover 65% of the number shown on the state’s expenditure table.

Those tables scale with combined parental income and with the number and ages of the children. A family with $5,000 in combined gross monthly income and one school-age child might see a total obligation around $900. The same family at $10,000 combined could see the figure climb past $1,500. The paying parent’s slice depends on their percentage of the combined income.

Percentage of Income (6 states)

Six states ignore the custodial parent’s earnings entirely and set support as a percentage of only the noncustodial parent’s income.³ The reasoning is that the custodial parent already contributes through daily care, housing, and meals.⁴ Typical rates run around 17% to 20% of net income for one child and rise with each additional child. A noncustodial parent clearing $4,000 per month net could owe roughly $680 to $800 for one child.

What Counts as Income

Both models start by figuring out what each parent actually earns, and courts look well beyond a W-2 salary. Commissions, bonuses, overtime, rental income, Social Security disability payments, veterans’ benefits, and investment returns all count. Self-employment income gets particular scrutiny, because courts will add back business deductions that look more personal than operational, such as meals, entertainment, or a vehicle that doubles as a family car. The goal is true economic capacity, not the figure at the bottom of a tax return.

Both parents typically submit tax returns, recent pay stubs, and a financial disclosure form listing income, assets, and debts. Federal law also requires every order to address how the child’s healthcare will be covered.⁴ Misstating income on the disclosure can bring sanctions or a contempt finding.

Imputed Income

A parent who quits a well-paying job or cuts back to part-time hours to shrink an obligation will rarely get away with it. When a court finds that a parent is voluntarily unemployed or underemployed, it can impute income based on work history, education, skills, and local job opportunities, and run the formula as though the parent were earning what they reasonably could. Where there is not enough history to estimate, some guidelines presume the parent could earn at least 75% of the federal poverty level for a single person, which works out to about $997 per month using the 2026 poverty guideline of $15,960.⁵

How Custody Time Shifts the Payment

Overnights are the usual measuring stick. Once the noncustodial parent crosses a threshold (often somewhere around 28% to 30% of annual overnights, depending on the state), the formula adjusts downward to reflect the food, utilities, and other costs that parent covers while the child is in their home.

In a true shared-custody arrangement with roughly equal time, many states apply a cross-credit: each parent’s obligation is calculated separately, and the higher earner pays the difference between the two. Sole custody, where the child is with one parent nearly all the time, produces the highest payments because the primary household carries almost all of the day-to-day expense.

Add-Ons That Push the Real Cost Higher

The base guideline number rarely tells the whole story. Most orders add other costs on top and divide them between the parents in proportion to income.

Health insurance premiums. The parent with employer coverage is usually ordered to enroll the child when the cost is reasonable, and the child’s share of the premium is split.
Unreimbursed medical costs. Copays, deductibles, orthodontics, therapy, and uncovered prescriptions are typically split pro rata.
Work-related childcare. Daycare and after-school care needed so a parent can work are added to the base obligation and shared.

These add-ons can lift the effective monthly obligation several hundred dollars above the base number. A parent paying $500 in base support who also covers half of a $1,200 daycare bill and a $200 insurance premium is really paying closer to $1,200 per month in child-related costs.

When Courts Deviate From the Guidelines

The guideline figure carries a legal presumption that it is correct, but either parent can argue for a higher or lower number, and a judge who agrees must explain the departure in writing.² Common grounds include:

Special needs. A chronic medical condition or disability that generates expenses the formula does not capture.
Extreme income. Very high earners may see support capped to avoid a windfall; very low earners may receive a minimum order, often $50 per month or less, to preserve a payment habit without piling up impossible debt.
Travel costs. When parents live far apart, transporting the child for visitation can justify a reduction.
Other children. A parent supporting children from another relationship may receive an adjustment so all children are treated equitably.

Deviations are the exception. Most orders land within a few percentage points of the guideline figure. One boundary worth knowing: roughly a dozen states let courts order parents to contribute to college tuition and related costs past age 18, weighing each parent’s resources, the child’s academic ability, and the family’s prior standard of living. In other states, judges have no such authority, though a divorce agreement that promises college contributions is enforceable as a contract.

Modifying the Amount Later

Orders are not permanent. Either parent can seek a modification when circumstances change meaningfully, most often after a significant income shift (job loss, raise, retirement), a change in custody, or a new medical need. Many state agencies also conduct periodic reviews and will seek an adjustment if the recalculated figure differs from the current order by at least $50 or 20%, whichever is less.

A federal rule catches many paying parents off guard: past-due child support cannot be reduced retroactively.⁶ If you lose your job and wait six months to file for a modification, you owe the full original amount for those six months no matter what you actually earned. Each missed payment becomes a judgment the moment it comes due, and no court can erase it after the fact. The one narrow exception is that a modification can reach back to the date the other parent received notice of the pending request. Filing quickly is often worth more than any argument you can make later.

1
U.S. Census Bureau. Custodial Parents and Their Child Support: 2022
2
Office of the Law Revision Counsel. 42 USC 667 – State Guidelines for Child Support Awards
3
National Conference of State Legislatures. Child Support Guideline Models
4
Administration for Children and Families. How Is the Amount of My Child Support Order Set?
5
Office of the Assistant Secretary for Planning and Evaluation. 2026 Poverty Guidelines
6
Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures