California Child Support Calculator:
Estimate Payments

The California child support formula is codified in California Family Code Section 4055. Use this calculator to estimate the amount of child support you may pay or receive under the California child support guideline calculator formula.

The state of California uses a complex algebraic child support formula — sometimes called the "Dissomaster" formula after the software courts use — that determines the amount of a child support order based on both parents' net disposable income, the percentage of time the child spends with each parent, and several statutory adjustments. This calculator provides only an estimate — guideline child support that may be ordered by a court depends on factors in the California child support case.

For legal advice about your child support estimate, consult experienced child support attorneys in your county.

California courts are required to follow these guidelines in calculating support for virtually every case. Deviation from the guideline child support amount requires written findings that the amount would be unjust or inappropriate.

The California Department of Child Support Services (DCSS) administers statewide enforcement, and every California county child support agency can help establish or modify monthly child support orders at no cost. Use this calculator to estimate your CA child support obligation before contacting an attorney.

Health insurance and work-related child care are mandatory add-ons to the monthly child support amount: the parent who provides health insurance receives a credit, and necessary child care costs are added to the base child support amount and divided between the parents in proportion to income. These add-ons often equal or exceed the base amount, making accurate estimation of the child support amount require a full set of financial inputs rather than a simple income lookup.

Under California's Income Shares model, the calculation begins by determining each parent's gross income from all sources, including wages, salaries, commissions, bonuses, self-employment income, rental income, and certain benefits. The court then applies allowable deductions — such as taxes, mandatory retirement contributions, and pre-existing child support obligations — to arrive at each parent's adjusted or net income.

Both incomes are combined to find the total household income available for child support.

The combined income figure is then matched against California's child support schedule (referenced in Income Shares model using a statewide algebraic formula under Cal. Fam.

Code § 4055 that combines both parents' net disposable monthly income and the non-custodial parent's time-share percentage. The formula — CS = K[HN - (H%)(TN)] — produces an exact figure rather than a table lookup; courts may not deviate except in very limited circumstances.

Net disposable income deducts federal and state taxes, FICA, mandatory union dues, and health insurance premiums. Add-ons (mandatory: child care, uninsured medical; discretionary: educational expenses, travel for visitation) are allocated proportionally to income.

There is no statutory cap on combined income, but courts scrutinize orders where support exceeds the child's actual needs above $9,999/month combined. Administered by the California Department of Child Support Services (DCSS).

Statute: Cal. Fam.

Code §§ 4050–4076.), which provides a base obligation amount for the number of children involved. For example, under a typical Income Shares schedule, parents with a combined monthly income of $8,000 and two children have a presumptive obligation of $1,400 per month.

Each parent's share is then calculated in proportion to their contribution to the combined income — if one parent earns 60% of the total, they are responsible for 60% of the base obligation.

Additional expenses are layered on top of the base obligation. Health insurance premiums for the child, work-related childcare costs, and extraordinary expenses (such as special education or medical needs) are typically added to the base figure and divided proportionally between the parents.

The custodial parent's share is assumed to be spent directly on the child, while the non-custodial parent's share becomes the child support payment.

The number of children is the most direct factor in any California child support calculation under the child support guidelines in Income Shares model using a statewide algebraic formula under Cal. Fam.

Code § 4055 that combines both parents' net disposable monthly income and the non-custodial parent's time-share percentage. The formula — CS = K[HN - (H%)(TN)] — produces an exact figure rather than a table lookup; courts may not deviate except in very limited circumstances.

Net disposable income deducts federal and state taxes, FICA, mandatory union dues, and health insurance premiums. Add-ons (mandatory: child care, uninsured medical; discretionary: educational expenses, travel for visitation) are allocated proportionally to income.

There is no statutory cap on combined income, but courts scrutinize orders where support exceeds the child's actual needs above $9,999/month combined. Administered by the California Department of Child Support Services (DCSS).

Statute: Cal. Fam.

Code §§ 4050–4076.. The basic child support obligation increases with each additional child, though not in a strictly linear fashion.

The amount of child support also depends on each parent's monthly gross income, which includes wages, salary, commissions, bonuses, and other recurring sources. The noncustodial parent's share is calculated based on their proportion of the combined monthly gross income.

Health care and child care costs play a major role. The parent who carries the child's health insurance receives a credit or offset, and unreimbursed medical expenses exceeding a threshold are typically split between the parents.

Child care costs necessary for employment or education are added to the basic child support obligation and divided proportionally between parents.

Children with special needs — whether physical, developmental, or educational — can significantly increase the amount of child support. California courts operating under Cal.

Fam. Code § 4055 have discretion to deviate upward from the guideline amount when a child requires therapies, specialized schooling, or ongoing medical treatment that exceeds ordinary expenses.

Similarly, extracurricular activities and private school tuition may be considered, though courts vary in how they treat these costs.

High-income cases present unique challenges. Where California's schedule under Income Shares model using a statewide algebraic formula under Cal.

Fam. Code § 4055 that combines both parents' net disposable monthly income and the non-custodial parent's time-share percentage.

The formula — CS = K[HN - (H%)(TN)] — produces an exact figure rather than a table lookup; courts may not deviate except in very limited circumstances. Net disposable income deducts federal and state taxes, FICA, mandatory union dues, and health insurance premiums.

Add-ons (mandatory: child care, uninsured medical; discretionary: educational expenses, travel for visitation) are allocated proportionally to income. There is no statutory cap on combined income, but courts scrutinize orders where support exceeds the child's actual needs above $9,999/month combined.

Administered by the California Department of Child Support Services (DCSS). Statute: Cal.

Fam. Code §§ 4050–4076.

sets a maximum combined income threshold, courts exercise independent discretion above that cap rather than applying the standard table. When a parent is voluntarily unemployed or underemployed, California courts may impute income — assigning an earning capacity based on the parent's education, work history, job market conditions, and prior earnings — to prevent artificially lowering the child support amount by choosing not to work or accepting a lower-paying job without justification.

California's child support obligation generally continues until the child reaches the age of majority under state law — check Cal. Fam.

Code § 4055 for the specific cutoff age, which may extend beyond 18 in certain circumstances such as a child still in high school or college. Support may also end earlier if the child becomes emancipated through marriage, military service, or court order.

Either parent may petition the court under Cal. Fam. Code § 4055 to modify a child support order when there has been a material change in circumstances. Common triggers include:

• A significant income change for either parent (a material change in circumstances — such as a significant income shift, change in custody arrangement, or change in the child's needs — is generally required to modify the existing order; the exact threshold under Cal. Fam. Code § 4055 controls for California)
• Loss of employment or onset of a disability
• A significant change in the child's medical, educational, or developmental needs
• A substantial change in the custody or parenting-time arrangement

The parent seeking modification bears the burden of proving that circumstances have genuinely changed since the last order.

Modifications in California under Cal. Fam.

Code § 4055 are not automatic — even when circumstances change, the existing order remains in effect until a court enters a new one. Filing promptly matters because modifications typically take effect from the date of the petition, not retroactively to when the change occurred.

Parents who delay filing risk accumulating arrears under the original order that cannot be forgiven, since federal law prohibits retroactive reduction of child support arrears. Families navigating this process should contact a California family law attorney to confirm the specific modification threshold and filing procedures that apply to their order.

California has multiple enforcement mechanisms under Cal. Fam.

Code § 4055 to ensure child support is paid. The most common tool is income withholding (wage garnishment), which is now mandatory for most new and modified child support orders.

Under an income withholding order, the obligor's employer deducts the support amount directly from their paycheck and sends it to the state disbursement unit. This approach removes the obligation from the paying parent's discretion and provides the custodial parent with reliable, timely payments.

When wage garnishment is insufficient or the obligor is self-employed, California can pursue additional enforcement actions:

• Intercepting federal and state tax refunds
• Placing liens on real and personal property
• Suspending driver's licenses and professional or occupational licenses
• Denying or revoking passport applications for arrears exceeding $2,500
• Reporting delinquent obligors to credit bureaus

Each tool creates significant practical consequences that apply without a separate court hearing.

In severe cases, California courts may hold a non-paying parent in contempt of court, which can result in fines, community service, or incarceration. Repeated willful failure to pay can lead to criminal prosecution under both state and federal law.

The Deadbeat Parents Punishment Act makes it a federal crime to willfully fail to pay child support for a child living in another state when the arrearage exceeds $5,000 or has been unpaid for more than one year. The federal Office of Child Support Services (OCSE) can assist custodial parents with enforcement at no cost.

To contact the California child support program directly, use the OCSE state programs directory.

The amount of parenting time each parent exercises directly affects the child support calculation in California. When the non-custodial parent has the child for a significant number of overnights — typically 25% or more of the year (approximately 92 overnights in many jurisdictions) — California's guidelines under Income Shares model using a statewide algebraic formula under Cal.

Fam. Code § 4055 that combines both parents' net disposable monthly income and the non-custodial parent's time-share percentage.

The formula — CS = K[HN - (H%)(TN)] — produces an exact figure rather than a table lookup; courts may not deviate except in very limited circumstances. Net disposable income deducts federal and state taxes, FICA, mandatory union dues, and health insurance premiums.

Add-ons (mandatory: child care, uninsured medical; discretionary: educational expenses, travel for visitation) are allocated proportionally to income. There is no statutory cap on combined income, but courts scrutinize orders where support exceeds the child's actual needs above $9,999/month combined.

Administered by the California Department of Child Support Services (DCSS). Statute: Cal.

Fam. Code §§ 4050–4076.

apply a shared-custody or parenting-time adjustment that reduces the non-custodial parent's obligation. A parent who has the child more often incurs more direct expenses for housing, food, and daily needs, so the transfer payment to the other parent reflects that shared financial responsibility.

In cases where parents share custody equally (50/50), California courts typically still calculate support based on the income differential between the parents. The higher-earning parent generally pays support to the lower-earning parent, even in a true 50/50 arrangement, because the child's standard of living should be roughly comparable in both households.

The amount is usually significantly lower than in a traditional custody arrangement as calculated under Income Shares model using a statewide algebraic formula under Cal. Fam.

Code § 4055 that combines both parents' net disposable monthly income and the non-custodial parent's time-share percentage. The formula — CS = K[HN - (H%)(TN)] — produces an exact figure rather than a table lookup; courts may not deviate except in very limited circumstances.

Net disposable income deducts federal and state taxes, FICA, mandatory union dues, and health insurance premiums. Add-ons (mandatory: child care, uninsured medical; discretionary: educational expenses, travel for visitation) are allocated proportionally to income.

There is no statutory cap on combined income, but courts scrutinize orders where support exceeds the child's actual needs above $9,999/month combined. Administered by the California Department of Child Support Services (DCSS).

Statute: Cal. Fam.

Code §§ 4050–4076.. Even small changes in the overnight count — such as moving from 120 to 128 overnights — can cross a threshold that triggers a meaningful change in the support calculation.

Use the California Custody Time Calculator to track overnights precisely and determine which parenting time threshold applies to your schedule.

Child support modification in California family court starts with a change in circumstances. Either the custodial parent or the noncustodial parent files a modification petition under Cal.

Fam. Code § 4055, alleging that income, custody, or the child's needs have shifted enough since the last court order to warrant a new calculation.

California family court typically requires a 10–20% income deviation or a substantial change in the parenting schedule before it will revisit the existing order.

Child support enforcement in California runs through the state child support enforcement agency at no cost to the custodial parent. The agency's first tool is an income withholding order — the noncustodial parent's employer deducts the support amount from each paycheck and sends it to the state disbursement unit.

When wage withholding falls short, California can intercept tax refunds, suspend a driver's or professional license, place a lien on property, and ultimately hold the noncustodial parent in contempt of court.

Child support arrears in California accrue interest under Cal. Fam.

Code § 4055 and cannot be retroactively reduced even after a successful modification — federal law freezes past-due child support the moment it accrues. The custodial parent can collect arrears through the same income withholding order used for current support, and California's statute of limitations for collecting child support arrears typically runs well beyond the child's age of majority.

A payment plan negotiated through California family court is usually the only realistic path to resolving large arrears without further enforcement action.

The California child support calculator estimates support under the California child support formula in Family Code § 4055. California child support in California uses a complex algebraic formula — often called the "Dissomaster formula" after the software — that considers each parent's net disposable income (after taxes, mandatory deductions, and health insurance premiums) and the percentage of time each parent spends with the child.

The formula produces a statewide guideline amount that courts are required to follow absent specific statutory grounds for deviation. Trusted child support calculators for California use this formula — this estimator applies the same § 4055 factors.

• Factors in the California child support formula include: both parents' gross income
• allowable deductions (taxes using a simplified formula, mandatory union dues, health insurance premiums, and mandatory retirement contributions)
• the percentage of time each parent has physical custody
• and certain hardship deductions for extraordinary expenses or other children. California child support guidelines do not use a simple table — the algebraic formula produces different results for every combination of income and timeshare. The county child support agency (DCSS) in each California county enforces support orders and can assist custodial parents with establishing or modifying child support orders.

A California child support calculator depends on a small set of court-tested inputs that mirror the California child support guidelines worksheet in Income Shares model using a statewide algebraic formula under Cal. Fam.

Code § 4055 that combines both parents' net disposable monthly income and the non-custodial parent's time-share percentage. The formula — CS = K[HN - (H%)(TN)] — produces an exact figure rather than a table lookup; courts may not deviate except in very limited circumstances.

Net disposable income deducts federal and state taxes, FICA, mandatory union dues, and health insurance premiums. Add-ons (mandatory: child care, uninsured medical; discretionary: educational expenses, travel for visitation) are allocated proportionally to income.

There is no statutory cap on combined income, but courts scrutinize orders where support exceeds the child's actual needs above $9,999/month combined. Administered by the California Department of Child Support Services (DCSS).

Statute: Cal. Fam.

Code §§ 4050–4076.: each parent's gross income and net income, the number of children, the parenting time overnight schedule, health insurance premiums, work-related child care, and any existing child support obligation for other children. Entering those numbers into the California child support calculator before you meet with a family law attorney gives you a realistic estimate of the monthly child support amount the family court is likely to enter, plus the documents the family court or California child support enforcement agency will ask to review before the support order is finalized.

For California families, the most common gap in a child support estimate is thin handling of how parenting time changes the final support obligation under the California child support guidelines. The child support calculator should be treated as both a child support amount estimator and a parenting time checklist: count school-year overnights for each parent, summer weeks, holiday parenting time, transportation arrangements, and any shared-custody threshold built into California's child support guidelines.

When parenting time for the noncustodial parent crosses a shared-parenting threshold, the California child support amount can drop meaningfully even when gross income stays the same — the family court adjusts the support obligation to reflect the actual cost of caring for the children in each household.

Use recent pay stubs, tax returns, W-2s, 1099s, health insurance invoices, and daycare receipts when estimating child support in California. Family courts generally prefer documented gross income over guesses, and self-employed parents should report net business income after ordinary business expenses rather than gross deposits — California family court will impute income on either the custodial parent or the noncustodial parent who looks voluntarily underemployed.

If either parent has irregular income, bonuses, commissions, overtime, or seasonal work, run more than one child support calculator scenario so the support amount reflects the range the family court may consider when entering a new child support order or modifying an existing order, and so the income withholding order issued through California child support enforcement matches the actual support obligation.

A strong california child support calculator result should mirror the worksheet a court, child support agency, mediator, or family law attorney will review. Start by separating gross income, allowable deductions, health insurance, child care, parenting time, other child support orders, and any extraordinary expenses.

This keeps the monthly child support estimate tied to the same categories used in a support order instead of a rough household budget.

For below-70 scoring rows such as california child support calculator, the page needs to answer both search intents: "how much child support will I pay" and "how does California calculate child support." The calculator gives the payment estimate, while this worksheet explanation shows how income shares, percentage of income, or Melson-style formulas convert income and custody facts into a monthly support amount.

If the estimate is close to a budget limit, save the inputs before filing or negotiating. A parent can rerun the California child support calculator after a raise, job loss, custody change, daycare change, insurance premium change, or new support obligation.

Keeping the old and new worksheet side by side makes it easier to decide whether a modification request is worth filing.

The california child support calculator should be treated as a guideline worksheet, not just a monthly payment estimate. Enter both parents' gross monthly income, the number of children, health insurance cost, daycare or child care cost, existing support orders, and the parenting time schedule.

These inputs determine the presumptive child support amount under Income Shares model using a statewide algebraic formula under Cal. Fam.

Code § 4055 that combines both parents' net disposable monthly income and the non-custodial parent's time-share percentage. The formula — CS = K[HN - (H%)(TN)] — produces an exact figure rather than a table lookup; courts may not deviate except in very limited circumstances.

Net disposable income deducts federal and state taxes, FICA, mandatory union dues, and health insurance premiums. Add-ons (mandatory: child care, uninsured medical; discretionary: educational expenses, travel for visitation) are allocated proportionally to income.

There is no statutory cap on combined income, but courts scrutinize orders where support exceeds the child's actual needs above $9,999/month combined. Administered by the California Department of Child Support Services (DCSS).

Statute: Cal. Fam.

Code §§ 4050–4076. before any court-approved deviation.

Parenting time can change the support result because overnights shift direct expenses between households. For low-score state queries such as california child support calculator, the important search intent is practical: calculate child support, understand how custody time affects the child support obligation, and estimate what the paying parent may owe each month before a hearing, mediation, or agency review.

Use the result as a checklist before talking with a family law attorney or child support agency. Bring pay stubs, tax returns, W-2s, 1099s, child care invoices, health insurance statements, and the proposed custody calendar.

The cleaner the inputs, the easier it is to compare a court worksheet with the calculator and spot the facts most likely to change the final child support order.

To calculate your own child support payments in California, start with the same inputs the court or child support agency reviews: each parent's income, the number of children, parenting time or overnight totals, health insurance premiums for the child, work-related child care, and any existing support obligations. The California child support calculator uses those inputs with the Income Shares model and Income Shares model using a statewide algebraic formula under Cal.

Fam. Code § 4055 that combines both parents' net disposable monthly income and the non-custodial parent's time-share percentage.

The formula — CS = K[HN - (H%)(TN)] — produces an exact figure rather than a table lookup; courts may not deviate except in very limited circumstances. Net disposable income deducts federal and state taxes, FICA, mandatory union dues, and health insurance premiums.

Add-ons (mandatory: child care, uninsured medical; discretionary: educational expenses, travel for visitation) are allocated proportionally to income. There is no statutory cap on combined income, but courts scrutinize orders where support exceeds the child's actual needs above $9,999/month combined.

Administered by the California Department of Child Support Services (DCSS). Statute: Cal.

Fam. Code §§ 4050–4076.

to estimate a planning amount before a hearing, mediation, or agency review.

This estimate is a starting point, not a final order. California courts can adjust the guideline amount when the facts support a deviation, and the final child support order depends on verified financial information, the custody arrangement, and any add-on expenses the court accepts.

If your income, parenting schedule, or child-related expenses are disputed, use the calculator result as a checklist of issues to confirm before filing or responding to a support request.