Child support for 2, 3 or more children

A family with three children does not need three times what a family with one child needs. Siblings share bedrooms, cars, groceries and utility bills, so the cost of each extra child is lower than the cost of the first. Child support guidelines build that into their schedules and percentages, which is why the guideline amount rises with each child but never in proportion.

This guide shows how the amount scales in three states, what happens when a family is larger than the state’s table, and how split custody and step-downs work.

Why support doesn’t double

Guideline schedules come from economic studies of what families spend on children at different income levels and family sizes. Those studies consistently find that spending per child falls as the number of children grows. The schedules translate that into support amounts.

Percentage states show the pattern most clearly. Tex. Fam. Code § 154.125 sets the guideline at 20% of the paying parent’s net resources for one child, 25% for two, 30% for three, 35% for four and 40% for five. Each extra child adds far less than the first, so the amount per child falls as the family grows. Income shares schedules follow the same idea, but the steps between columns differ by state and by income level.

How the amount scales in three states

The table shows guideline amounts for one family at different family sizes: Parent A earns $60,000 a year, Parent B earns $40,000, and the children live mainly with Parent B.

Measured against the one-child amount:

• In Texas, two children bring 1.25 times the one-child amount and three bring 1.5 times. The steps follow the statutory percentages exactly, because the paying parent’s net resources don’t change.
• In North Carolina, an income shares state, two children bring 1.5 times the one-child amount and three bring 1.78 times. The schedule column for each family size sets the step.
• In New York, which applies its percentage to combined income, two children bring 1.47 times the one-child amount and three bring 1.71 times.

The ratios differ because the models differ. In a percentage state such as Texas, the ratio is fixed by the rates unless a low-income rule or the income cap comes into play. In an income shares state, the step between columns depends on income, because the schedule is built from estimated spending at each income level. With Parent A at $150,000 and Parent B at $100,000, for instance, two children in North Carolina bring 1.45 times the one-child amount. New York sits in between: the percentages are fixed, but they apply to combined income, and only up to $193,000 a year unless a court applies them to more.

The first extra child usually adds the most. After that the increases taper, and at the top of a table they may flatten. The state pages show these figures for each family size, for example Texas with three children or North Carolina with two children, and the calculator handles any combination of incomes and children. For the one-child starting point in every state, see child support for one child. Twins and triplets use the same columns, and child support for twins and multiples covers what changes when children arrive together.

Families larger than the table

Every schedule stops somewhere. Widths differ: the North Carolina schedule has columns up to 6 children, Indiana’s goes to 8 and Oregon’s to 10. Percentage states set a rate for the largest family size and stop there.

States handle larger families in different ways. Among the states this site covers:

• The largest family size applies in Arizona, Arkansas, Colorado, Delaware, District of Columbia, Hawaii, Indiana, Iowa, Kentucky, Maryland, Massachusetts, Michigan, Mississippi, New Hampshire, New York, North Carolina, North Dakota, Oregon, Tennessee, Texas, Wisconsin and Wyoming. The amount for the last column or percentage is used for any larger family, unless a court deviates.
• The court decides in Alabama, California, Connecticut, Florida, Georgia, Idaho, Illinois, Kansas, Louisiana, Maine, Minnesota, Missouri, Nebraska, New Jersey, New Mexico, Ohio, Oklahoma, Rhode Island, South Carolina, South Dakota, Utah, Vermont, Virginia, Washington and West Virginia. The guidelines leave the amount above the table to the court.
• The table is extended in Pennsylvania, which adds the difference between the last two columns for each further child.

Large families are also where other rules tend to bite. A self-support reserve or low-income adjustment can cap the guideline amount for a paying parent with modest income, so adding a child may change the result less than the schedule alone suggests.

Split custody

Split custody means each parent has primary custody of at least one of the children. The North Carolina guidelines handle it with a separate worksheet: the combined obligation is divided by each parent’s income and by the number of children living with each parent, and the parent with the higher obligation pays the difference.

Among the states this site covers, the rules handle split custody as follows:

• An offset of the two obligations in Alabama, Alaska, Arizona, Arkansas, Connecticut, Delaware, Hawaii, Iowa, Kentucky, Louisiana, Maryland, Massachusetts, Minnesota, Nebraska, Nevada, New Jersey, North Carolina, North Dakota, Ohio, Oklahoma, Pennsylvania, South Dakota, Tennessee, Utah, Vermont, Virginia, West Virginia, Wisconsin and Wyoming.
• A separate worksheet for each household, then compared, in Georgia, Idaho, Illinois, Indiana, Kansas, Maine, Missouri, Montana, Rhode Island and South Carolina.
• No separate split-custody method in the guideline rules in California, Colorado, District of Columbia, Florida, Michigan, Mississippi, New Hampshire, New Mexico, New York, Oregon, Texas and Washington, where courts work out support for each household within the general guidelines.

Split custody is different from shared parenting time, where the same children move between homes. Shared time is covered in the parenting time guide.

When one child’s support ends

Support for each child usually ends at the age of majority or graduation, and in a family with several children that happens one child at a time. What happens to the order then depends on the state.

Texas requires the order to say so in advance. Under § 154.127, an order for more than one child must provide that, when support for a child ends, support for the remaining children follows the guidelines, typically by stating the reduced amount. For our family, that means a step from $1,050 for two children to $840 for one.

In states without a built-in step-down, the full amount may continue until a parent asks for a modification, and the amount for the remaining children is recalculated on current incomes. The modification calculator compares the existing order with the new guideline amount, and the guide to when child support ends covers ages by state.

Children from other relationships

Children from another relationship are a separate question from the number of children in this case. Most states adjust income for support a parent already pays under an earlier order, or for other children living in a parent’s home, before this family’s amount is worked out. The methods vary: some deduct a theoretical support amount for the other children, some deduct a percentage, and some use a separate formula. If the paying parent must also support other children, the percentage is reduced with the multiple-family formula in the Texas Family Code, whether or not those children have a support order.

The child support calculator includes these adjustments under its additional options where the state’s worksheet provides for them. The figures in this guide assume no other children. How a new child in a parent’s home changes the amount is covered in remarriage and child support. Courts can deviate from the guidelines when the overall picture calls for it, for example when a parent supports a large blended household.