How is child support calculated?

Child support is calculated using each state's specific formula, which typically considers both parents' gross monthly income, the number of children, and the custody arrangement. Most states use an Income Shares model or a Percentage of Income model.

Is this child support calculator accurate?

This calculator provides an estimate based on publicly available state guidelines. Actual court-ordered child support may differ based on deductions, special expenses, imputed income, and judicial discretion. Always consult a family law attorney for legal advice.

Which states does this calculator support?

SupportByState.com supports child support calculations for all 50 states using each state's current guidelines.

Is child support taxable income?

No. Child support payments are not taxable income for the recipient and are not tax-deductible for the paying parent under current IRS rules.

How do I use the California child support calculator?

To calculate California child support, apply CS = K × [HN − (H%) × (TN)]: enter both parents' net incomes and the timeshare percentage into the algebraic formula under Family Code §4055. Enter both parents' monthly income, the number of qualifying children, and the annual overnights for the non-custodial parent. The calculator applies the 2026 Fam. Code §4055 guidelines and returns an estimated monthly obligation with a line-item breakdown.

How accurate is the California child support calculator?

Our calculator applies Fam. Code §4055 directly and uses the current 2026 income schedule. Results are accurate for standard cases. They may differ from a court's actual order if either parent has complex self-employment deductions, there are multiple households with prior support obligations, or the case involves income imputation. Always verify with a California family law attorney.

What income is excluded from the California child support calculation?

Most states exclude: SSI (Supplemental Security Income), one-time gifts and inheritances, non-recurring windfalls, public assistance benefits, and income of a new spouse or partner. What counts as includable income is defined by Fam. Code §4055. The calculator uses includable income only.

What if one parent is self-employed in California?

Self-employment income in California is gross self-employment receipts minus allowable ordinary and necessary business expenses. Courts may disallow excessive expenses. If a self-employed parent minimizes income through deductions, the court can impute income based on earning capacity, prior earnings history, or available job market data.

Does 50/50 custody eliminate child support in California?

Not automatically. California calculates a base obligation from both parents' incomes, then applies a shared parenting adjustment. The court evaluates the custody arrangement. The parent with the higher income typically still owes some support in equal custody, reflecting the income disparity between households.

When can California child support be modified?

California child support can be modified when there is a material change in circumstances — typically a 15–20% change in either parent's income, a significant change in custody time, or a change in the child's needs. File a petition with the court that issued the original order. Modifications are only retroactive to the petition date.

2026 California Child Support Calculator — Estimate Your Monthly Obligation

To calculate California child support, apply CS = K × [HN − (H%) × (TN)]: enter both parents' net incomes and the timeshare percentage into the algebraic formula under Family Code §4055. Enter the inputs below to get an instant estimate based on California's current 2026 guidelines. The result includes a line-item breakdown showing exactly how the obligation was calculated.

To calculate accurately, you will need: (1) both parents' monthly gross income from all sources including wages, bonuses, and self-employment; (2) the number of qualifying children covered by this order; (3) the number of overnights the child spends with the non-custodial parent annually out of 365; and (4) any monthly costs either parent pays for the child's health insurance and work-related childcare. These add-ons are allocated proportionally and affect the final obligation.

California's child support guidelines under Fam. Code §4055 reflect Complex algebraic formula factoring timeshare percentage and net disposable income. Courts in California apply the statutory formula as a rebuttable presumption — the guideline amount is the correct amount unless a party presents evidence that deviation is in the child's best interest.

What to Enter in the California Child Support Calculator

Input Field	What to Include	What to Exclude
Monthly gross income (your income)	Wages, salary, bonuses, commissions, overtime, self-employment, rental income, dividends, Social Security	One-time gifts, inheritances, SSI, public assistance
Monthly gross income (other parent)	Same categories — all regular income from all sources	Same exclusions
Number of children	All qualifying children subject to this order	Stepchildren unless formally adopted; adult children no longer eligible
Overnights per year (non-custodial)	Actual overnights in your custody schedule out of 365	Daytime-only visits without overnight stays
Health insurance premium	Monthly cost for child's coverage only	Premium portion for the parent's own coverage
Childcare (work-related)	Monthly childcare costs enabling the parent to work	Enrichment or discretionary childcare not work-related

Frequently Asked Questions

How do I use the California child support calculator?: To calculate California child support, apply CS = K × [HN − (H%) × (TN)]: enter both parents' net incomes and the timeshare percentage into the algebraic formula under Family Code §4055. Enter both parents' monthly income, the number of qualifying children, and the annual overnights for the non-custodial parent. The calculator applies the 2026 Fam. Code §4055 guidelines and returns an estimated monthly obligation with a line-item breakdown.
How accurate is the California child support calculator?: Our calculator applies Fam. Code §4055 directly and uses the current 2026 income schedule. Results are accurate for standard cases. They may differ from a court's actual order if either parent has complex self-employment deductions, there are multiple households with prior support obligations, or the case involves income imputation. Always verify with a California family law attorney.
What income is excluded from the California child support calculation?: Most states exclude: SSI (Supplemental Security Income), one-time gifts and inheritances, non-recurring windfalls, public assistance benefits, and income of a new spouse or partner. What counts as includable income is defined by Fam. Code §4055. The calculator uses includable income only.
What if one parent is self-employed in California?: Self-employment income in California is gross self-employment receipts minus allowable ordinary and necessary business expenses. Courts may disallow excessive expenses. If a self-employed parent minimizes income through deductions, the court can impute income based on earning capacity, prior earnings history, or available job market data.
Does 50/50 custody eliminate child support in California?: Not automatically. California calculates a base obligation from both parents' incomes, then applies a shared parenting adjustment. The court evaluates the custody arrangement. The parent with the higher income typically still owes some support in equal custody, reflecting the income disparity between households.
When can California child support be modified?: California child support can be modified when there is a material change in circumstances — typically a 15–20% change in either parent's income, a significant change in custody time, or a change in the child's needs. File a petition with the court that issued the original order. Modifications are only retroactive to the petition date.

2026 California Child Support Calculator — Estimate Your Monthly Obligation

What to Enter in the California Child Support Calculator

Frequently Asked Questions

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