Child Support Calculator California 2026 – With 50/50 Custody, Arrears & Laws | SupportCalcByState
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California 2026
⚖ Official California Formula
Child Support Calculator California 2026
California uses the Income Shares model — both parents’ net incomes are combined. Updated for 2026 — covers 50/50 custody, arrears, modifications and California child support laws.
BothParents Income
NoneIncome Cap
18Age Support Ends
10%Arrears Interest
🌴 California Income Shares Model
California Child Support Calculator 2026
California uses the Income Shares model — both parents’ net incomes are combined.
ℹCalifornia uses net income — Net = gross minus federal taxes, Social Security, Medicare and health insurance premiums.
$
$0$20k
$
$0$20k
$
$
Estimated Monthly Child Support
$0
per month
Annual Total
$0
Combined Income
—
Until Age
18
* Estimate using official California income shares formula. Courts may deviate based on special circumstances. Consult a California family law attorney for your specific situation.
🌴 How California Calculates Child Support
ModelIncome Shares — both parents’ combined net income
Income CapNo set cap — courts use discretion
Minimum Order$50/month minimum regardless of income
Arrears Interest10% annual interest on unpaid arrears
California Key RuleCalifornia uses a mandatory algebraic formula — one of the most complex in the country
Additional InfoCalifornia considers both parents’ net disposable incomes and percentage of time with each parent
⚖ 50/50 Custody in California
Does Child Support Apply With 50/50 Custody in California?
In most cases, yes. California does not automatically eliminate child support with equal parenting time.
✓General rule: With 50/50 custody, the higher-earning parent typically pays the lower-earning parent. The amount is reduced vs sole custody but rarely reaches $0.
$
$0$15k
$
$0$15k
Estimated Monthly Payment
$0
per month
Without Custody Adj.
$0
Custody Reduction
$0
Net Payment
$0
* 50/50 custody calculations are complex. This is an approximation. Consult a California family law attorney for exact figures.
📋 California Arrears Calculator
California Child Support Arrears Calculator
Calculate total back child support including 10% annual interest California applies to unpaid arrears.
⚠California charges 10% annual interest on all unpaid child support arrears.
$
$
$
Total Arrears Owed (with 10% Interest)
$0
including California 10% annual interest
Base Arrears
$0
Interest Accrued
$0
Clear in 1 Year
$0
Clear in 2 Years
$0
Clear in 3 Years
$0
Support Ends Age
18
* California applies 10% annual interest to unpaid child support. There is generally no statute of limitations on child support debt.
🔄 Modification Estimator
California Child Support Modification
Estimate your new payment and check if you qualify for a modification in California.
ℹModification rule: Most states allow modification when the new amount differs by 15-20% or $100/month, OR when there is a material and substantial change in circumstances (job loss, new child, custody change).
$
36+ months = eligible for routine review
$
Estimated New Monthly Payment
$0
per month
Current Order
$0
New Calculated
$0
Difference
$0
% Change
0%
Likely Qualifies?
—
Time Since Order
—
* Qualification estimate only. Consult a California family law attorney before filing.
📜 Updated 2026
California Child Support Laws 2026
Key rules, age cutoffs and what you need to know in California.
FORMULA How California Calculates Child Support
California Family Code Section 4050-4076 mandates use of the DissoMaster or XSpouse software for guideline calculations. Courts cannot deviate from guideline without specific findings.
AGE When Does Child Support End in California?
Child support in California ends when the child turns 18 — or high school graduation, whichever is later (19 max). Support also ends upon the child’s death, marriage or emancipation. Important: In most cases support does not stop automatically — you need a court order. Stopping payments without a court order creates arrears even after the child reaches the cutoff age.
INTEREST Arrears Interest in California
California charges 10% annual interest on unpaid child support arrears. California’s rate of 10% is among the higher rates in the country. There is generally no statute of limitations on child support debt.
ENFORCEMENT California Child Support Enforcement
California has broad enforcement powers including wage garnishment, tax refund interception, driver’s license suspension, professional license suspension, passport denial, and credit bureau reporting. Criminal charges may apply for significant or long-term non-payment.
MODIFY Modifying Child Support in California
Child support can be modified in California when there is a material and substantial change in circumstances — typically a significant income change, job loss, new children from another relationship, or change in custody. Most states also allow a periodic review every 3 years. File a petition with the court — private agreements to change support are not legally enforceable.
📅 California Payment Calendar
Child Support Payment Calendar 2026
Generate your personal payment schedule and track payments month by month.
$
Monthly Total
$0
Annual Total
$0
Next Payment
—
Days Until Due
—
Payments Remaining
—
Marked Paid
$0
* Click Mark as Paid to track payments. Always keep payment receipts.
Need a California Family Law Attorney?
This calculator provides estimates. For filing, modifying or enforcing a child support order, connect with a local family law attorney.