How and Why Do I Have to Pay Child Support When I Have Joint Custody?

This article answers three questions:

  1. "Do I have to pay child support if I have joint physical custody?"
  2. "Why do I have to pay child support if I have 50/50 custody?"
  3. "How is Child Support Calculated if I Have 50/50 Custody?"

Let's get to it. Click on each part if you want to jump ahead.

Do I Have to Pay Child Support if I Have Joint Physical Custody?

Answer: Yes, if the Guideline Child Support formula requires it.

In California, child support is based on several factors, but the two most important are the time each parent spends with the child and each parent's income.

California uses a formula to determine each parent's net disposable income that is available for child support. That formula is part of the State's Child Support Guideline rules. While the amount of parenting time is a factor, it is not the only factor. That means even with equal or nearly equal parenting time as part of joint custody, a parent with a higher income might still pay child support to ensure the child maintains a similar standard of living in both households.

The goal of the Guideline formula is to balance financial responsibilities, considering each parent's ability to contribute to the child's needs.

Why Do I Have to Pay Child Support if I Have 50/50 Custody?

Answer: Even with 50/50 custody, you might still need to pay child support if your income differs from the other parent.

This may seem counterintuitive. A parent may think that because they have a child 50% of the time, the child costs that parent the same as the other parent. That may be true, but child support is also about a parent's ability to financially provide for the child. When one parent makes more money than the other, the higher-earning parent usually (but not always) has a greater ability to provide financial support for the child.

How is Child Support Calculated if I Have 50/50 Custody?

Answer: In California, computer programs calculate child support using a standardized formula established by the State's Guidelines. Programs like DissoMaster™ and Xspouse™ automate these complex calculations. Here's how they typically work.

Input Data Collection

Income Information: Both parents' gross and net monthly incomes are entered, including wages, bonuses, commissions, self-employment income, and other sources of income.

Time-Share Percentage: The time each parent spends with the child, as a percentage, is inputted and determined by the custody arrangement and parenting plan.

More Factors: The program considers other factors, including but not limited to tax filing status, deductions for other child support or spousal support obligations, health insurance premiums, required union dues, and retirement contributions.

Applying the Guideline Formula

The computer program calculates child support using California's guideline formula. At the risk of giving you too much information, here is the formula:

CS = K × (HN - (H% × TN))

Here is what the formula means:

CS is the child support amount.

K is the amount of both parents' incomes allocated for child support.

HN is the high earner's net monthly disposable income.

H% is the percentage of time the high earner has primary physical responsibility for the children.

TN is the total net monthly disposable income of both parents.

Calculating Disposable Income

The program calculates each parent's net disposable income by subtracting taxes and other allowable deductions from their gross income. This net income is used in the formula to determine the parents' ability to pay child support.

Determining the Support Amount

The program applies the collected data to the Guideline formula. It then provides a Guideline child support amount.

Adjustments and Deviations

The program can factor in any court-ordered deviations or adjustments, such as extraordinary medical expenses, special needs of the child, or travel expenses for visitation. Child support deviations are also available when a parent is an extraordinarily high-income earner.

Generating Reports

The final step involves generating detailed reports outlining the calculations and the resulting child support amount. These reports can be used in child support cases.

Do you want to learn more about custody and child support?

Contact our family law firm for a strategy session to learn more about child support in any circumstance. We have offices in Orange County, Los Angeles, and San Diego.

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