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California Family Law Hub

Navigate California Child & Spousal Support with Confidence

Explore SB 343 income shares calculations, K-factor time-share adjustments, and § 4320 spousal support factors using calculators and curated resources designed for attorneys, mediators, and self-represented litigants.

SB 343 Child Support Overview
Income shares model with refreshed economic tables

SB 343 modernized the cost-of-living data underpinning guideline support and clarified hardship adjustments. Both parents’ incomes combine to establish a basic obligation, then the K-factor and time-share percentages allocate financial responsibility.

Extraordinary circumstances—medical costs, special needs, education—can trigger deviations from the calculated amount. Courts must document reasons whenever orders depart from guideline results.

Spousal Support Framework
County formulas and § 4320 permanent factors

Temporary spousal support often follows county guidelines such as the Santa Clara 40/50 rule (40% of payor’s net income minus 50% of payee’s). Permanent support is determined under § 4320, balancing the couple’s marital standard of living, earning capacity, and documented contributions.

Courts remain cautious with long-term orders, frequently providing “Gavron warnings” that encourage recipients to pursue self-sufficiency and revisit support as circumstances evolve.

Start with California Calculators

California Child Support Calculator
Implements SB 343 income shares model with updated economic tables, K-factor, and hardship logic.
California Spousal Support Calculator
Analyzes county temporary formulas and § 4320 permanent factors for detailed support planning.

Key California Highlights

Income Shares Model
Family Code § 4055 computes guideline support by combining both parents’ incomes and allocating obligations proportionally.
SB 343 Economic Update
SB 343 refreshed statewide cost data and hardship allowances, effective 2024, requiring calculators to adopt the new tables.
K-Factor & Time Share
The K-factor adjusts obligations based on custodial time splits; precise parenting time inputs materially affect results.
Special Hardships
Courts consider extraordinary medical expenses, educational costs, and housing needs when deviating from guideline support.
County Temporary Formulas
Counties such as Santa Clara apply the 40/50 rule (40% of payor’s net income minus 50% of payee’s net income) for temporary orders.
§ 4320 Permanent Factors
Permanent support requires analyzing 14 factors including standard of living, earning capacity, and contributions to the marriage.

Foundational California Resources

Family Code § 4055 (Child Support Formula)
Official guideline formula including the K-factor definitions and hardship adjustments.
SB 343 Legislative Analysis
Legislative counsel report detailing the 2024 updates to California’s child support framework.
Family Code § 4320 (Spousal Support Factors)
Fourteen statutory factors that guide permanent spousal support determinations.

California Family Law FAQ

How did SB 343 change California child support calculations?

SB 343 modernized the income shares model beginning January 1, 2024 by updating the economic data tables, refining K-factor adjustments, and expanding hardship consideration rules.

What is the California K-factor?

The K-factor determines how combined child support obligations are allocated between parents based on custodial time. It is a core component of the guideline formula defined in Family Code § 4055.

How are county-specific temporary spousal support formulas handled?

California counties like Santa Clara, Los Angeles, and Alameda maintain recommended temporary support formulas. Our calculator explains the 40/50 rule and county variations while still highlighting court discretion.

What are the § 4320 permanent spousal support factors?

Family Code § 4320 lists 14 factors including earning capacity, standard of living, contributions to education, documented domestic violence, and tax consequences. Judicial discretion governs final awards.

Ready to Apply California Support Formulas?

Use our calculators to apply SB 343 child support and county spousal support formulas, then reference the cited statutes to prepare for mediation or court proceedings.

Start with Child Support

Calculations and summaries reference the California Family Code and SB 343 updates. They are educational in nature and do not replace individualized legal counsel. Consult a California family law attorney to evaluate your specific case.