California Child Support Calculator

What is a California Child Support Calculator?

A California Child Support Calculator estimates monthly base support using both parents’ net disposable incomes, the number of children in the case and parenting time. The calculator applies California’s statewide guideline structure and shows which parent pays the estimated amount.

The result is a planning estimate, not a court order. A judge or child support commissioner determines the ordered amount after reviewing the case. Childcare, uninsured medical expenses, special needs, visitation travel and court-specific deviations are not included in the displayed base.

This calculator is designed for 2026 planning when all children entered have the same parenting schedule. If different children follow different schedules, use the official process because one Parent A percentage cannot represent those arrangements accurately.

How to Use the California Child Support Calculator

Step 1: Enter Parent A’s Monthly Net Disposable Income

Use Parent A’s whole-dollar monthly net disposable income under California Family Code section 4059. This is not automatically gross salary, taxable income or the deposit shown on a paycheck.

Net disposable income can reflect actual federal and state income-tax liability, FICA, qualifying health premiums, mandatory employment deductions and certain support obligations. Do not subtract ordinary rent, groceries or unrelated personal spending.

Step 2: Enter Parent B’s Monthly Net Disposable Income

Use the same definition and monthly period for Parent B. If you have an established annual net amount, divide it by 12 before entering it. Do not enter an annual figure in a monthly field.

Support income can differ from the figures used in a general household budget. The California Living Wage Calculator addresses living-cost needs, while this calculator requires the legal net-income concept used in the guideline.

Step 3: Select the Number of Children

Choose the number of children included in this support case. California uses multipliers for additional children; the calculator does not simply multiply a one-child result by the number of children.

Only include children covered by the same calculation. Existing support for other children may affect net disposable income, but those children should not automatically be added to this case’s child-count field.

Step 4: Enter Parent A’s Parenting Time

Enter Parent A’s approximate percentage of primary physical responsibility. Parent B receives the remainder. For example, entering 20% for Parent A means Parent B’s displayed parenting time is 80%.

Use the actual schedule rather than assuming a custody label always represents 50%. The guide on How Child Support Works in California explains the broader process, including orders, changes and payment responsibilities.

Step 5: Calculate and Review Both Results

Click Calculate to see the monthly base before any low-income adjustment. The result also shows combined monthly net income, Parent B’s time and the possible adjusted-base range when the paying parent qualifies.

The lower end of a displayed range is not automatic. The court decides whether the adjustment applies and how much of the permitted reduction is appropriate.

Child Support Calculation Example for 2026

Enter these values:

• Parent A net disposable income: $6,000 per month
• Parent B net disposable income: $4,000 per month
• Children in this support case: 1
• Parent A parenting time: 20%

Combined monthly net income is $10,000. Parent A is the higher earner, and Parent A’s time fraction is 0.20. For this income level, the guideline income fraction is 0.25.

The allocation factor is:

K = (1 + 0.20) × 0.25 = 0.30

The base-support calculation is:

CS = 0.30 × [$6,000 − (0.20 × $10,000)]

CS = 0.30 × $4,000 = $1,200 per month

The calculator therefore shows Parent A pays Parent B $1,200 monthly before add-ons or deviations. The low-income adjustment is not triggered because the paying parent’s $6,000 monthly net income exceeds the applicable comparison amount.

The official DCSS calculator uses the same legal guidelines used in California courts and provides a more detailed case estimate. Its result is still not a guarantee of what a judge will order.

What the Base Estimate Excludes

Employment-related childcare and reasonable uninsured healthcare can be ordered as additional support. Educational or other special needs and visitation travel may also be added in an appropriate case.

Spousal support is a separate calculation. How to Calculate Alimony in California explains why temporary or long-term alimony should not be inserted into the child-count or parenting-time fields.

If you need a separate temporary-support illustration, the California Spousal Alimony Calculator handles that limited purpose. Adding its result to this estimate does not create a court-approved combined payment.

The calculator also does not determine benefit eligibility. The California CalFresh SNAP Calculator provides a separate household screening, but the county makes the eligibility decision.

Common Mistakes When Calculating Child Support

1. Entering gross salary: Use verified monthly net disposable income, not annual salary or ordinary paycheck take-home.
2. Reversing parenting time: The field asks for Parent A’s percentage; Parent B receives the remainder automatically.
3. Treating the estimate as an order: Only the court can establish or change the legally required payment.
4. Assuming add-ons are included: Childcare, uninsured medical costs and other additional support are outside the displayed base.
5. Using the wrong financial tool: The California Probate Fee Calculator concerns estate administration fees, not child-support income, payments or enforcement.

For other California-specific estimates, visit California Calculator and keep each tool’s result tied to its stated purpose.

FAQs

Q1: Does 50/50 parenting time mean no child support?
A: No. Different net incomes can still produce a payment even when parenting time is equal.

Q2: Does this calculator include childcare expenses?
A: No. It displays base support before childcare, uninsured medical costs and other add-ons.

Q3: Can I use gross monthly salary?
A: No. Use whole-dollar monthly net disposable income calculated under the applicable California support rules.

Q4: Is the low-income adjustment automatic?
A: No. The calculator displays the permitted range when triggered, but the court decides whether and how much to adjust.

Q5: Can this calculator change an existing order?
A: No. A new estimate does not modify the amount legally due. Follow the court or agency process to request a change.