California Paycheck Taxes Explained for 2026

The 5 Core Taxes on Every California Paycheck

When you examine a California pay stub (earnings statement), your gross compensation is reduced by two federal income taxes, two federal payroll taxes, and two state-specific line items:

1. Federal Income Tax (FIT): Withheld according to IRS Publication 15-T based on your Form W-4.

2. Social Security Tax: 6.2% on wages up to $184,500 for tax year 2026.

3. Medicare Tax: 1.45% on all wages, plus 0.9% Additional Medicare Tax on wages paid in excess of $200,000.

4. California Personal Income Tax (PIT): State income tax administered by the Franchise Tax Board (FTB) and withheld by the Employment Development Department (EDD).

5. California State Disability Insurance (SDI): Mandatory employee-funded disability and paid family leave insurance taxed at 1.30%.

How California PIT Withholding Works (EDD Method B)

California payroll systems use the EDD Method B (Exact Calculation Method) to compute state income tax withholding. This method mirrors the federal annualization approach:

First, your gross pay per period is annualized by multiplying by your pay periods (e.g., 26 for biweekly). Next, California’s standard deduction (over $5,500 for single filers in 2026) is subtracted. The remaining amount is run through California’s progressive tax brackets, and state withholding allowance credits are subtracted to reach the final withholding figure.

California SDI: The Mandatory 1.30% Surtax

State Disability Insurance is separate from California state income tax. SDI funds short-term disability benefits and California’s Paid Family Leave (PFL) program.

In past years, California capped the amount of wages subject to SDI. However, under California Senate Bill 951, the wage ceiling was permanently removed starting in 2024. For 2026, the SDI tax rate is 1.30% on all W-2 earnings without limit.

Crucial State Pre-Tax Differences: 401(k) vs. HSA

Federal and California tax codes do not treat all pre-tax payroll deductions identically. While traditional 401(k)/403(b) retirement contributions and Section 125 medical, dental, and vision insurance premiums are exempt from both federal and California income taxes, Health Savings Accounts (HSAs) require careful attention:

Employee HSA contributions made through a Section 125 cafeteria-plan salary reduction may be excluded from federal income tax withholding, Social Security, and Medicare taxes. In contrast, ordinary employee payroll deductions outside a qualifying Section 125 cafeteria plan are generally included in wages for federal withholding and FICA purposes.

Crucially, California does not conform to the federal HSA tax exclusion under California Revenue and Taxation Code (R&TC) § 17215 (nonconforming to IRC § 223). Consequently, employee HSA contributions are NOT exempt from California Personal Income Tax (PIT) withholding and must be included in California state taxable wages on Form W-2 (Box 16). In addition, interest and investment earnings inside an HSA are taxable on California state returns (Form 540).