In California, the best interests of the child are always paramount. The laws are set up to ensure that the child is financially, physically, and emotionally cared for by both parents. If you and your spouse have equal (50/50) custody of your child, you might assume that neither of you has to pay child support to the other.
It seems logical that if your custody is shared, you each cover costs for the child when the child is with you. However, in California, custody and child support are two separate components, and one parent may be required to pay child support to the other, even in a 50/50 arrangement. This might leave you wondering, Why do I pay child support with 50/50 custody?
Key Takeaways
- Child Support and Custody Are Separate: Even with 50/50 custody, the higher-earning parent typically pays child support because California law requires both parents to contribute proportionally based on income, not just time spent with the child.
- Complex Calculation Formula: Child support is calculated using the formula CS = K[HN – (H%)(TN)], which factors in both parents’ incomes, parenting time percentages, and additional expenses like childcare, education, and medical costs.
- 2024 Updates to Guidelines: California’s child support guidelines were updated in September 2024, including revised K-value calculations, broader income definitions (adding severance pay, veterans benefits, and military allowances), and low-income adjustments now tied to minimum wage.
Quick Highlights
- Child support and custody are separate — even with 50/50 custody, the higher earner may pay support.
- Payments cover essentials (housing, food, education, healthcare) until the child turns 18 or 19.
- Calculations depend on income + parenting time, with adjustments for childcare, education, and medical costs.
- Either parent can request modification if circumstances change (job loss, income change, custody shifts).
- New 2024 updates: revised K value, broader income definition, education/training costs included, low-income tied to minimum wage.
- A family law attorney helps ensure fair calculations and modifications.
We will explain what child support is, how it’s calculated, and why a higher-earning parent may still be responsible for payments when you have joint custody. A skilled child support attorney can help you estimate child support payments and modify existing child support orders.
What Is Child Support?
Child support is a monthly payment made by one or both parents for the support of the child. California law provides that the mother and father must share equal responsibility to support their child financially. Child support can cover the child’s living expenses, including food, shelter, education, and clothing. The payments aim to minimize differences in living standards and maintain continuity of care in the two separate households.
The child’s best interests are always central when determining child support payments. It can be easy to lose track of that greater purpose during a divorce. The parent paying more is often upset they have a greater financial responsibility, and the parent receiving the money often feels as though there is barely enough money to cover the costs. It is essential to remember that your child’s care is the main focus.
Child support payments last until the child reaches the age of 18 or is out of high school (up to 19 years old if still in high school).
How Child Support Is Calculated
The child support formula is complex, factoring in multiple financial and custodial variables. California provides an online child support calculator to give parents a general estimate, but consulting a family law attorney is often the best approach for a more precise calculation that considers specific circumstances.
The two main factors that determine child support calculations are the income of the parents and custody (time spent with the child).
Income
Both parents must submit an Income and Expense Declaration to the court. They must also provide proof of income. The sources of income and expenses the court will assess may include:
- Salaries, wages, commissions, and bonuses;
- Rents (usually from rental properties);
- Dividends, stocks, and investments;
- Self-employment earnings;
- Retirement contributions;
- Unemployment or disability insurance benefits;
- Pensions or social security benefits;
- Costs of raising children from another relationship; and
- Health premiums.
To assess income, the court can also look at the earning capacity of each parent. Earning capacity is what you could potentially make given your education, skills, age, health, and the current job market.
The court considers these factors to reach a fair payment for both the parents and the child. Child support payments are not to punish either parent. They are meant to help ensure the care of the child.
Time Spent with the Child
The other major component is the parenting time each parent has with the child or the amount of time they each spend with the child. Typically, the parent who spends more time with the child will receive child support payments from the other parent. This is because the parent who has more time with the child ends up paying more of the childcare expenses.
The percentage of time each parent spends with the child is based on the custody order that is in place. Calculating the custody percentage can be challenging. You may want to use an online tool or speak with an experienced attorney about calculating the correct number.
California Formula for Child Support Calculations
California has a set formula for calculating child support payments. The formula is: CS = K[HN – (H%)(TN)]. The formula broken down is:
- CS—the total child support amount,
- K—the amount of both parents’ income that will be used for child support,
- HN—the high-earning parent’s net monthly disposable income,
- H%—the percentage of time the high-earning parent has with the child, and
- TN—the total net monthly disposable income of both parents.
If there are multiple children, the formula multiplies the amount by another factor ranging from 1.6 for 2 children to 2.86 for 10 children.
Other factors that may influence or alter child support payments include:
- Number of minor children,
- Special needs of the child,
- Child care expenses,
- Educational expenses, and
- Medical insurance expenses.
As you can see, the formula is rather complicated. California offers an online child support calculator you can use to get an estimate of the payment amount. You can also work with an experienced child support lawyer to help estimate payments.
In most cases, the formula leads to a fair payment amount. The judge, however, has the final determination and may adjust it up or down if appropriate. Ultimately, the court is working to balance the child’s needs and the parents’ financial situations.
Why Do I Pay Child Support with 50/50 Custody?
If one parent earns significantly more than the other in a 50/50 custody case, that parent will likely owe child support. This is because child support calculations consider income disparities to ensure both parents contribute proportionally to the child’s financial needs.
Can I Ask for a Modification to the Child Support Amount?
Either parent can ask the court to modify child support payments. You might want to ask for a modification if you experience a material change in circumstances. Requesting a change in the child support amount might be appropriate if:
- You were laid off from your job,
- Your family size changes,
- You or the other parent has a significant change in income,
- You become disabled,
- Your custody or visitation changes,
- Your child has a change in needs (medical, educational, extracurricular),
- You go to jail or prison, or
- You are sent on active military duty.
To ask the court for a modification, you must submit a request to modify the existing order. As the requesting party, you are responsible for submitting documentation justifying the request. Or if you and the other parent can agree on the modification and new payment amount ahead of time, you can file a stipulation with the court. If the other party does not agree to the modification, you will both have to appear in court and have the judge decide.
Updates to California’s Child Support Guidelines
California recently updated its child support guidelines to better account for the realities parents face in the modern age. Those updates primarily relate to:
- The K value (amount of income used to calculate child support),
- The requirement that a court issue an expedited support order in certain circumstances,
- Calculating additional child support,
- The definition of income,
- Determinations of parental earning capacity, and
- Low-income adjustments.
These changes went into effect on September 1, 2024, while child support agency changes are required to create new, transparent policies and processes by January 1, 2026.
K Value
Under the old rules, you calculated K as follows:
| Net Disposable Income Per Month | K Is Equal To |
| $0–800 | 0.20 + TN^/16,000 |
| $801–6,666 | 0.25 |
| $6,667–10,000 | 0.10 + 1,000/TN |
| Over $10,000 | 0.12 + 800/TN |
^Recall that TN is the total combined net monthly disposable income of both parents.
Now, the calculation is:
| Net Disposable Income Per Month | K Is Equal To |
| $0–2,900 | 0.165 + TN/82,857 |
| $2,901–5,000 | 0.131 + TN/42,149 |
| $5,001–10,000 | 0.25 |
| $10,000–15,000 | 0.10 + 1,499/TN |
| Over $15,000 | 0.12 + 1,200/TN |
These adjustments attempt to more precisely measure actual childcare costs.
Expedited Support Orders
Previously, when a child support agency opened a case or a parent applied for public assistance, courts had to issue expedited child support orders. Now, courts have discretion to either issue an expedited order or not.
Definition of Income
The guidelines added the following to the definition of income:
- Severance pay,
- Veterans benefits not based on need, and
- Military allowances for housing and food.
Parents should now add these items to determine their income.
Earning Capacity
Although child support is generally based on a parent’s income, courts can sometimes use a parent’s earning capacity to determine child support, rather than their actual income. A judge may do so when, for example, they suspect that someone is underemployed to avoid having to pay child support.
Recent changes to the law specify that a court should determine a parent’s earning capacity in two circumstances: when the parent’s annual gross income is unknown or when the judge determines it is in the children’s best interests to figure earning capacity separately from a person’s actual income.
Additional Child Support
Additional child support includes optional and mandatory add-ons for childcare-related expenses, particularly related to health insurance and gaining job skills. Although the previous guidelines included costs related to education or employment training, the new law adds an assumption that expenses you incur for education or training are reasonable. This assumption makes it simpler to get additional child support related to pursuing job skills.
Low-Income Adjustments
Under prior California law, courts could adjust child support amounts to account for the fact that a parent has a low income only when they earned $1,500 or less per month. Now, courts consider whether the parent’s net disposable income is more or less than the amount someone would make working at the California minimum wage for 40 hours per week and 52 weeks per year.
Call Pakpour Banks LLP Today with Your Child Support Questions
Pakpour Banks, LLP, has a strong focus on family law and helping families manage the challenging process of divorce. Consult our family law attorneys for help with child support orders or modification requests.
Our attorneys advocate for fair child support determinations. We want to help you resolve child support disputes quickly and protect you from difficult financial situations. We also always keep your child’s best interests in mind.
Our attorneys have experience handling child support cases throughout California. And with a small firm, we can dedicate our attention and time to each of our client’s individual needs. We respond to emails, text messages, and calls quickly because we understand the importance of the issues you are facing. Contact Pakpour Banks today with questions about child support or child custody.
Brian enters the family law profession with a refreshing approach to these proceedings: heal families; don’t destroy them. In some cases, this means the family is going to look different than it did before. In other cases, this means a new family is created where there was none before. Either way, individuals should leave family court knowing their voices were heard, and with healthy attitudes about themselves and those they love.