California Child Support Calculator 2026 – Official Statewide Guideline Formula
Use our free California child support calculator for 2026 to estimate guideline support under California Family Code Section 4055. California law uses a unique algebraic formula that considers both parents’ incomes and custody time.
Therefore, our calculator uses the official formula CS = K[HN – (H%)(TN)] with the current K-factor table operative September 1, 2024 through 2026. For example, if you know both parents’ net monthly incomes and timeshare, you can get an accurate estimate here
CS = K[HN – (H%)(TN)] • Official K-Factor • Timeshare Weighted
How California Child Support Is Calculated in 2026
California does not use a simple percentage like Texas. Instead, California law requires a four-step calculation. As a result, the court balances income and time to reach a fair amount. In addition, the court must follow the statewide uniform guideline, so judges start with the formula.
First, the court determines net disposable income. Second, the court finds the K-factor. Third, the court applies the formula. Finally, the court adjusts for multiple children. Because of this process, California support reflects both financial resources and parenting time.
Step 1 – Determine Each Parent’s Net Disposable Income:
California starts with annual gross income from all sources. However, California does not use gross directly. Instead, the court deducts specific items under Family Code 4059 to reach net disposable income. For example, the court deducts actual federal and state income taxes based on filing status. In addition, the court deducts FICA or Social Security retirement contributions, mandatory union dues and retirement, health insurance premiums for yourself and children you support, court-ordered child or spousal support you already pay to another family, job-related expenses if the court allows them, and hardship deductions for other children you support. After that, the court divides annual net disposable by 12 to get monthly net disposable. Therefore, the monthly number enters the guideline formula.
Compare K-factor with Texas percentage model and New York $193k cap rules. See also Florida gross-up method and Pennsylvania $30k formula.
Step 2 – Understand the Official Formula CS = K[HN – (H%)(TN)]
The statewide uniform guideline formula is CS = K[HN – (H%)(TN)]. CS equals child support amount. K equals allocation factor based on combined income and custody time. HN equals high earner’s net monthly disposable income. H% equals percentage of time high earner has primary physical responsibility for children. TN equals total net monthly disposable income of both parents combined. If the result is positive, high earner pays lower earner. However, if the result is negative, lower earner pays the absolute value to higher earner. Because of this rule, the higher earner usually pays, but shared custody can reduce the amount.
Step 3 – Find K-Factor Using Current California Table
K equals (1 + H%) if H% is 50% or less, or (2 – H%) if H% is more than 50%, times the fraction below based on TN.
For example, if TN is low, K is higher. In contrast, if TN is high, K decreases to account for lower percentage needs
| Total Net Disposable Per Month (TN) | K Fraction Formula |
|---|---|
| $0 – $800 | 0.20 + TN / 16,000 |
| $801 – $6,666 | 0.25 |
| $6,667 – $10,000 | 0.10 + 1,000 / TN |
| Over $10,000 | 0.12 + 800 / TN |
For example, if TN = $5,000 and H% = 20%, K = (1 + 0.20) x 0.25 = 0.30. Therefore, K captures both income level and time sharing.
Step 4 – Adjust for Multiple Children and Low Income
For more than one child, you multiply CS by a factor. For instance, 2 children = 1.6, 3 children = 2.0, 4 children = 2.3, 5 children = 2.5, 6 children = 2.625, 7 = 2.75, 8 = 2.813, 9 = 2.844, 10 = 2.86 per Family Code 4055(b)(4). In addition, California provides a low-income adjustment. If obligor’s net monthly disposable is less than full-time minimum wage gross, the court presumes a low-income adjustment under 4055(b)(7). As a result, the court may reduce support to avoid hardship, but the other party can rebut the presumption.
California Child Support Example Calculation:
Suppose Parent A net monthly = $6,000 and Parent B net monthly = $2,000. Total TN = $8,000. High earner is Parent A with HN = $6,000 and H% = 30% timeshare. First, TN = $8,000 falls in $6,667-$10,000 bracket, so K fraction = 0.10 + 1,000/8,000 = 0.225. Second, K = (1 + 0.30) x 0.225 = 0.2925. Third, CS = 0.2925 x [6,000 – 0.30 x 8,000] = 0.2925 x 3,600 = $1,053 for one child. Finally, for two children, $1,053 x 1.6 = $1,684.80. Therefore, Parent A pays Parent B $1,053 for one child.
What Add-Ons Does California Require?
In addition to base support, California adds mandatory add-ons. For example, the court orders child care costs related to employment, uninsured medical costs, and educational expenses. Because of this rule, total obligation exceeds base CS. The court splits add-ons usually 50/50 based on incomes, but the court can adjust based on circumstances.
Official California Resources and Enforcement
For official calculation, California courts use certified software like DissoMaster. You can also cross-check with California Child Support Services at https://childsupport.ca.gov or call 866-901-3212. Our site SupportCalcUSA.com is not affiliated with California courts. If you need legal advice, consult a California family law attorney.
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Frequently Asked Questions:
CS = K[HN – (H%)(TN)] under Family Code 4055 operative Sept 1, 2024. K is allocation factor, HN is high earner net monthly, H% is high earner timeshare, TN is total net monthly of both parents
Under Family Code 4059, start with gross income, deduct actual federal and state taxes, FICA, mandatory union and retirement, health premiums, other court-ordered support you already pay, job expenses, and hardship. Then divide by 12.
K = (1+H%) if H% £50% or (2-H%) if H% >50% times fraction based on TN: $0-800 = 0.20+TN/16,000; $801-6,666 = 0.25; $6,667-10,000 = 0.10+1,000/TN; Over $10,000 = 0.12+800/TN.
No. Even with 50/50, higher earner still pays if incomes differ. Because H% = 50% reduces but does not eliminate support when HN differs from TN/2, the higher earner still owes guideline support
All income including wages, salary, commissions, bonuses, overtime, self-employment, rents, royalties, dividends, interest, trust, workers comp, disability, unemployment benefits.
Multiply one-child CS by 1.6 for 2 children, 2.0 for 3, 2.3 for 4, 2.5 for 5, 2.625 for 6, up to 2.86 for 10 children under 4055(b)(4).
No. California has no net resources cap. K fraction decreases as TN rises over $10,000, but total support still increases with income.
Yes, if you show significant change in income, timeshare, or needs. You must file a Request for Order and prove changed circumstances.
Generally no, new spouse income is excluded except in extraordinary case where excluding would cause extreme hardship to child under 4057.5.
Estimate only based on Family Code 4055-4059 current 2026 law. Courts use certified DissoMaster software and consider low-income adjustment, add-ons, and deviations. Not legal advice.