California Child Support Calculator

Estimate California child support using the statewide uniform guideline. Enter both parents' incomes, number of children, and parenting time to calculate the estimated monthly support based on California Family Code.

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Enter incomes for both parents to see the estimated California child support obligation.

How California Child Support Is Calculated

California uses a statewide uniform guidelineformula (California Family Code Section 4055) that is one of the most detailed child support formulas in the United States. The formula considers both parents' incomes, the number of children, and the percentage of time each parent spends caring for the children (timeshare).

The California Support Formula

The basic California child support formula is: CS = K × (HN - (H%)(TN)), where CS is the child support amount, K is a variable representing the percentage of combined income allocated to support, HN is the high earner's net income, H% is the high earner's timeshare percentage, and TN is the total net income of both parents.

Key Factors

  • Both parents' incomes: California always considers both parents' incomes
  • Timeshare: The percentage of time each parent has physical custody significantly affects the calculation
  • No strict income cap: Above guideline levels, courts have discretion based on child's needs
  • High cost of living: California support orders tend to be higher than many other states
  • Mandatory wage assignment: California requires income withholding for all support orders

Important Disclaimer

This calculator provides an educational estimate based on California's uniform guideline formula. Actual support amounts may differ based on specific court findings, deviations, and judicial discretion. Consult a licensed California family law attorney for legal advice.

Frequently Asked Questions

How does California calculate child support?
California uses a statewide uniform guideline formula that considers both parents' incomes, the number of children, and the percentage of time each parent spends with the children. The formula is complex and involves the K factor (which accounts for timeshare and income brackets). California is known for having higher support amounts than many other states due to higher cost of living.
What is the K factor in California support?
The K factor is a variable in California's child support formula that accounts for both parents' incomes and the timeshare percentage. K = 1 + H%, where H% is the timeshare percentage of the higher-earning parent. A higher timeshare for the higher earner reduces the support amount, while more equal parenting time can significantly reduce support.
Does California have an income cap?
California does NOT have a strict income cap for child support. For combined income above a certain threshold (adjusted periodically), the court uses discretion to determine the appropriate amount based on the child's needs and the parents' standard of living. High-income cases can involve significant support amounts.
How often can California child support be modified?
California allows modification when there is a material change in circumstances. This includes changes in income, employment status, parenting time, or the child's needs. Support typically continues until the child turns 18 (or 19 if still enrolled in high school full-time).
What deductions are allowed in California?
California allows deductions from gross income including: federal and state income taxes, Social Security/Medicare, mandatory retirement contributions, health insurance premiums, union dues, and child support paid for other children. Self-employment taxes and business expenses may also be deducted.

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