State Tax Estimate · Tax Year 2026
The quirks that catch even lifelong Californians. One line each, a source on every one, tax year 2026.
Instead of shrinking your income, California takes flat credits straight off your bill: $153 per adult and $475 per dependent (2025 amounts; FTB has not published 2026 yet). A kid is worth the same to everyone, whatever their bracket.
Source: FTB 2025 Form 540 bookletTaxable income over $1,000,000 pays an extra 1% Behavioral Health Services Tax (renamed from the Mental Health Services Tax for 2025), for a 13.3% top rate. The line is the same for single and married filers and never moves with inflation.
Source: FTB 2025 Form 540 bookletEven if you file single on your federal return, California requires RDPs to file married/RDP jointly or separately.
Source: FTB 2025 Form 540 bookletState Disability Insurance comes out of every paycheck: 1.2% in 2025, 1.3% in 2026. Since 2024 there is no wage cap, so high earners pay it on all of their pay. It funds disability and paid family leave.
Source: EDD: rates and withholdingChanging your federal W-4 doesn’t change your state withholding. California uses form DE 4, which you hand to your employer separately.
Source: EDD: rates and withholdingCalifornia generally does not follow the 2025 One Big Beautiful Bill Act. Deductions for tips, overtime and the bigger senior deduction lower your federal bill, not your California one.
Source: FTB 2025 Form 540 bookletThere is no lower long-term rate like the federal 0/15/20%. A big stock or home sale is taxed exactly like wages, at your full marginal rate.
Source: FTB 2025 Form 540 bookletHealth savings accounts get no state tax break. Your employer’s contribution (W-2 box 12, code W) is added back to your income, and interest and gains inside the HSA are taxed every year.
Source: FTB 2025 Schedule CA (540) instructionsSocial Security benefits and California Lottery winnings are state-tax-free. Watch the flip side: other states’ lottery wins and other states’ municipal bond interest are taxed here.
Source: FTB 2025 Schedule CA (540) instructionsThe base rate is capped at 1% of assessed value, and assessments rise at most 2% a year until you sell. New buyers are assessed at the purchase price and often pay 1.1%-1.25% once bonds and special taxes are added.
Source: Santa Clara County Assessor: Prop 13Since Prop 19 (2021), a child keeps a parent’s low Prop 13 assessment only by moving in as their main home, and only up to about $1M of added value. A rental or vacation home inherited from a parent gets reassessed.
Source: BOE: Proposition 19Buy something taxable online or out of state without paying California sales tax and you legally owe use tax at the same rate. There is a line for it on Form 540.
Source: FTB 2025 Form 540 bookletCalifornia gives everyone an automatic extension to October 15 to file, no form needed. Any tax you owe is still due April 15, and interest starts then.
Source: FTB 2025 Form 540 bookletThe IRS wants four equal quarters. California wants 30% in April, 40% in June, nothing in September and 30% in January. Paying federal-style leaves you short in June.
Source: FTB: Estimated tax paymentsCalifornia kept its own individual mandate. Any month you or your dependents go without qualifying coverage can add a penalty to your state return unless you have an exemption.
Source: FTB: Health care mandateA California resident owes tax on all income, wherever it’s earned. Moving away means proving your life moved too: home, license, voter registration, where your family lives.
Source: FTB Pub 1031: Determining resident statusNonresidents owe California tax on pay for work physically done here, usually split by the share of workdays spent in the state.
Source: FTB: Part-year and nonresidentSwap a California rental for property in another state and California still taxes the deferred gain when you finally sell. You file Form 3840 every year until then.
Source: FTB Form 3840 (2025)Now see what you'd actually owe
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A simplified educational guide for tax year 2026, not tax advice. Check anything that matters with the Franchise Tax Board or a tax professional.