Child support for three children has no fixed amount — it depends on each parent's income, custody arrangement, and your state's formula
There is no national child support table. A parent with three children in California pays a different percentage of income than a parent in Texas or New York, because each state writes its own math. Most states use income shares — a formula that divides the cost of raising children between both parents based on what each earns. A few states use percentage of income — a flat percentage of the paying parent's gross income, regardless of what the other parent makes. One state uses a hybrid. The paying parent's actual monthly obligation could range from $400 to $3,000 or more, depending on income level and which state's rules apply.
The number you will see in a court order is not a guess or a recommendation. It is the result of plugging specific numbers — your income, your ex's income, custody time, childcare costs, health insurance costs — into your state's statutory formula. If you want to know what you will actually owe or receive, you need to know which state's formula applies and what both parents' incomes are.
Key Takeaways
- Child support amounts are set by state law using a formula, not by a judge's discretion, so the same income in different states produces different orders.
- Most states use income shares, which means both parents' incomes are added together, a child-rearing cost is calculated, and each parent pays their percentage of that cost.
- The paying parent's income is usually gross income before taxes, and may include bonuses, overtime, and self-employment income, not just base salary.
- Custody time (overnights) affects the calculation in most states, because more parenting time reduces the other parent's support obligation.
- You can request a calculation from your state's child support enforcement office or use your state's online calculator, though a family law attorney can walk you through the numbers for your specific situation.
How income shares formulas work with three children
Under income shares, the first step is adding both parents' gross monthly income. The second step is looking up what the state says it costs to raise three children at that combined income level — this number is called the basic child support obligation. The third step is dividing that obligation between the parents based on each parent's percentage of the combined income.
Example: Parent A earns $4,000 per month. Parent B earns $2,000 per month. Combined income is $6,000. Your state's table says three children cost $1,200 per month at that income level. Parent A earns 67% of the combined income, so Parent A pays 67% of $1,200 = $804. Parent B earns 33%, so Parent B pays 33% of $1,200 = $396. If Parent A has the children 80% of the time and Parent B has them 20%, the formula then adjusts for custody — Parent B's obligation may be reduced because Parent B is already spending money on the children during those overnights.
The basic obligation tables vary widely by state. Three children at a $6,000 combined income might cost $900 per month in one state and $1,400 in another. States also set different caps on income — some stop calculating at $150,000 combined income, others at $250,000 or higher. If both parents earn above the cap, the judge has discretion to order more, but the formula itself stops working.
What income counts toward child support
Child support is calculated on gross income, not take-home pay. This includes salary, wages, bonuses, overtime, commissions, self-employment income, rental income, interest and dividend income, and in some states, unemployment benefits or workers' compensation. It does not include welfare, food stamps, or Supplemental Security Income (SSI).
If you are self-employed, you report net self-employment income (revenue minus ordinary business expenses). If you own a business, the court may look at whether you are deliberately keeping income low to reduce support — this is called imputing income, and judges can order you to pay based on what you could earn, not what you currently report.
Bonuses and overtime are included if they are regular and recurring. A one-time bonus may not be. Retirement contributions, taxes, and health insurance premiums are deducted from gross income in some states before the formula is applied, but not in others — this varies by state rule.
How custody time changes the amount
Most states adjust child support based on how many overnights each parent has with the children per year. The logic is straightforward: if you have the children half the time, you are already spending money on housing, food, and utilities for them, so the other parent's obligation to you should be lower.
The adjustment is not a simple 50-50 split. States use different thresholds — some reduce support only if the non-custodial parent has at least 110 overnights per year (roughly 30%), others at 40% or higher. The reduction formula also varies: some states reduce the obligation proportionally, others use a different calculation entirely. A parent with 40% custody does not automatically pay 60% of the obligation.
Custody time is counted as overnights, not daytime hours. A parent who has the children every weekend and two weeknights might have 100+ overnights per year. A parent who has them every other weekend has roughly 26 overnights per year. The custody order or parenting plan should specify this clearly, because child support enforcement will use those numbers to calculate the adjustment.
Additional costs beyond the basic obligation
The basic child support obligation covers food, housing, and ordinary expenses. On top of that, most states require the paying parent to cover childcare costs (if the other parent works or is in school), health insurance premiums for the children, and uninsured medical expenses above a threshold (often $250 per child per year). Some states also add work-related education costs or extracurricular activities, though these are more discretionary.
These add-ons are not optional. If the receiving parent pays $300 per month for childcare so they can work, the paying parent typically reimburses their percentage of that cost on top of the base support. If health insurance costs $150 per month for three children, the paying parent usually covers that in full or splits it. Uninsured medical bills — orthodontia, therapy, emergency room visits — may be split 50-50 or divided by income percentage, depending on state law.
College expenses are not included in child support in most states. Support typically ends at age 18 or high school graduation, whichever is later. Some states extend it to age 19 or 20 if the child is still in high school. A few states allow a parent to petition for support through college, but this is not automatic and requires a separate court order.
State-by-state variation in formulas
The difference between states is substantial. Here are the approaches most commonly used:
| Formula Type | How It Works | States Using It |
|---|---|---|
| Income Shares | Both parents' income is combined, a cost table is applied, and each parent pays their percentage of the total. | Most states, including California, New York, Texas, Florida, Illinois, Pennsylvania |
| Percentage of Income | The paying parent pays a flat percentage of gross income: typically 17% for one child, 25% for two, 32% for three, 40% for four, 45% for five or more. | Texas (for income below the cap), Alabama, Louisiana, Mississippi, and others |
| Hybrid | Combines income shares for lower incomes with percentage of income for higher incomes. | A few states use this as a transition method |
Within income shares, states also differ on income caps, what counts as income, how much custody time triggers an adjustment, and whether childcare and health insurance are added on top or built into the basic obligation. You cannot calculate your obligation without knowing your state's specific rules.
How to find out what you will owe or receive
Your state's child support enforcement office (usually part of the Department of Human Services or Attorney General's office) can provide a calculation or direct you to an online calculator. Many states publish their formulas and income tables publicly on their websites. Some allow you to enter your numbers into an automated tool and see the result immediately.
If you are already in a court case, the other parent or their attorney may have filed a child support worksheet — this is the actual calculation showing income, deductions, the basic obligation, custody adjustments, and add-ons. If you have a court order, it should show the monthly amount and explain which income was used.
A family law attorney in your state can walk you through the calculation for your specific situation, including whether income should be imputed, what deductions apply, and how custody time will be counted. This costs money upfront but prevents costly mistakes in a court filing. Some legal aid offices offer free or low-cost consultations for parents who cannot afford private counsel.
What happens if circumstances change
Child support is not permanent at the amount set in the original order. If either parent's income changes significantly, if custody time changes, or if a child reaches the age where support ends, either parent can ask the court to modify the order. Most states allow modification if there has been a substantial change in circumstances — usually defined as a 10% or greater change in income, or a significant shift in custody.
The modification process requires filing a motion with the court and providing current income documentation. The court will recalculate using the new numbers and issue a new order. If you stop paying the old amount before the new order is signed, you may owe arrears (back support). If you continue paying the old amount after your income drops, you are not may have access to to a refund unless the court retroactively reduces the order.
Some states allow income to be adjusted downward if a parent voluntarily reduces work hours or takes a lower-paying job, but courts are skeptical of this and may impute income based on your earning capacity instead. If you lose a job involuntarily, you should file for modification immediately with proof of the job loss, because arrears can accumulate quickly.
Frequently Asked Questions
Is there a federal minimum or maximum for child support?
No. Federal law requires states to have formulas and guidelines, but does not set a minimum or maximum amount. A state can order $100 per month or $5,000 per month depending on income and the state's rules. The only federal involvement is that child support orders are enforceable across state lines and can be enforced through wage garnishment and tax intercept.
What if one parent makes much more than the other?
The higher-earning parent pays a larger percentage of the obligation. If Parent A earns $10,000 per month and Parent B earns $1,000 per month, Parent A pays roughly 91% of the basic obligation. Some states cap income at a certain level (like $250,000) and give judges discretion above that, but the formula itself still applies to the capped amount.
Does child support change if I get custody of all three kids?
Yes. If custody changes so that you now have the children most or all of the time, the other parent's obligation increases or may disappear entirely. You would need to file a modification request with the new custody arrangement and current income information. The court will recalculate and issue a new order.
Can I negotiate a different amount with the other parent?
You can agree to a different amount, but it must be approved by a judge and put in a written court order to be enforceable. A verbal agreement or a payment arrangement outside court is not legally binding. If the other parent stops paying, you have no recourse unless there is a court order. Both parents should have the agreement reviewed by an attorney before signing.
What if the paying parent is unemployed or disabled?
The court will impute income based on the parent's earning capacity, work history, and education — not zero. If a parent is genuinely unable to work due to disability, they can request a reduction, but must provide medical documentation. Unemployment alone is usually not grounds for eliminating support, though it may reduce the amount temporarily while the parent searches for work.