Split Custody & Child Support

By Elizabeth Rayne

Although courts generally want to keep children together after a divorce, different types of custody arrangements work for different families. Split custody -- when siblings live with different parents -- is not a common arrangement, and it can make child support calculations especially complicated. The particular rules and regulations for both support and custody are highly dependent on the facts of your case and the laws of your state.

Custody Overview

Although the terminology and regulations differ by state law, courts generally differentiate between legal and physical custody. Legal custody refers to which parent makes important decisions for the child, such as where the child will go to school or if he should undergo a particular medical procedure. By contrast, physical custody refers to where the child primarily lives. With a split custody arrangement, the divorced parents have more than one child together and each child lives with a different parent. For example, in a split custody arrangement, a father may have sole physical custody of the daughter and the mother has sole physical custody of the son. The parents may have shared legal custody, or legal custody may be similarly split.

Child Support Overview

To calculate the support owed by each parent, states typically follow one of several models for support. The most popular method of support is the income shares model, which considers the income of both parents to ensure that children receive the same amount of support they normally would if their parents were still together. Other states use the percentage of income model, which looks only at the income of the noncustodial parent. A small number of states use the Melson formula, which is similar to the income shares model, but also considers the financial needs of the parents.

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Individual Calculation Method

When it comes to child support and split custody, courts may first calculate each parent's obligation individually. In other words, if the mother has custody of the son, the court could first calculate the support the father owes based only on that custody arrangement. If the father has custody of the daughter, the court could then calculate the amount of support the mother owes to the father based only on that relationship. The court will then look at both amounts and subtract the lower payment from the higher payment, and the parent who owes the larger payment will pay the difference to the other parent.

Prorated Calculation

Instead of considering each family unit separately, another method of calculating support in split custody cases is to prorate the support owed to each child based on the total number of children. This typically occurs in states that set the percentage of child support owed based on the number of children. For example, if the guidelines provide that parents must pay 30 percent of their income if they have three children, and the father has custody of only one of the children, the father will pay 20 percent of his income towards child support, while the mother will pay 10 percent. Again, the parent with the larger support obligation will pay the difference between the two amounts.

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How Does Child Support Work With Joint Custody?


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How Child Support Works

Child support is designed to ensure that children do not suffer financially when their parents split. When parents divorce, the divorce court establishes an amount of financial support the noncustodial parent must pay to the custodial parent. However, each state uses its own guidelines and methods to set and process these payments.

Children on Social Security & Child Support in New Jersey

When a divorce involves children, the court typically has to address the issue of child support. In a child support arrangement, the parent who has custody receives a regular payment from the noncustodial parent. The amount of the payment depends on many different factors, which can vary according to state law. In New Jersey, the earnings of both parents are included in the calculation for child support; however, "means-tested" public benefits, such as Supplemental Security Income, are not included.

What Percentage of Income Does Child Support Take for One Kid?

Each state's laws determine how much child support a non-custodial parent must pay after a divorce, and the rates and method of calculation vary between states. These payments are intended to pay for a child's normal expenses, such as housing, food, clothing and education. Though courts frequently use the guidelines to set child support amounts, courts do not have to follow them in cases where they would not be appropriate, such as when a child needs special medical care because of a disability.

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