California Property Tax Calculator 2026

How California state income tax works in 2026

California uses a marginal bracket system, which means each additional dollar you earn is taxed at the rate of the bracket that dollar falls into — not your entire income. A single filer earning $90,000 in taxable income, for example, pays 1% on the first ~$10,000, then 2%, then 4%, and so on, with only the portion above each threshold taxed at the next rate. The effective rate (total state tax ÷ taxable income) for a $90,000 single filer is roughly 5%, even though the marginal rate sits at 9.3%.

California also conforms only partially to the Internal Revenue Code. The state allows its own standard deduction (significantly smaller than the federal $15,000+ for single filers), uses its own itemized deduction rules (notably disallowing the federal SALT cap workaround for individuals), and does not recognize federal qualified dividend or long-term capital gains preferential rates — all capital gains in California are taxed as ordinary income at the full bracket rate.

Residency is determined by the FTB's nine-factor test, which includes voter registration, driver's license issuance, location of family, professional licenses, and time spent in-state. Part-year and non-resident filers must use Form 540NR and apportion income; our calculator assumes full-year residency.

California-specific deductions and credits

Common California-only deductions and credits that can materially change your liability include:

• California Earned Income Tax Credit (CalEITC) — refundable, up to ~$3,600 for filers with three or more qualifying children and earned income under the annual phase-out.
• Young Child Tax Credit (YCTC) — up to $1,154 per family for taxpayers with a child under six who qualify for CalEITC.
• Renter's Credit — $60 (single) or $120 (joint) for renters meeting the income threshold.
• 529 (ScholarShare) contributions — no state deduction in California, but earnings grow state-tax free for qualified higher-education expenses.
• Mortgage interest — California still allows interest on up to $1 million of acquisition debt (vs. the federal $750,000 cap for post-2017 loans).
• SALT — California has not adopted the federal $10,000 SALT cap for state purposes; full property tax and DMV vehicle license fees remain deductible against state income tax for itemizers.

Property tax: Proposition 13 and what it really means

California's effective property tax rate of roughly 0.75% looks low on the surface, but Prop 13 is what actually drives the math. Assessed value is set at the purchase price and may only increase by up to 2% per year, regardless of market appreciation. A home bought in 2005 for $400,000 may carry an assessed value below $600,000 in 2026 even if the home would sell for $1.5M today, producing a property tax bill closer to $4,500 than $11,000.

Mello-Roos special tax assessments (CFDs) in newer developments — common in Irvine, Eastvale, and parts of San Diego County — can add 0.5%–1.5% on top of the base 1% Prop 13 rate, so the all-in property tax bill in newer master-planned communities is often closer to 1.5%–2.0% of assessed value. The calculator uses California's statewide effective average and is best treated as a starting estimate; your actual bill is on your county assessor's statement.

Capital gains in California

There is no preferential long-term capital gains rate in California. A $100,000 long-term capital gain held by a high-income California household is taxed federally at 20% plus the 3.8% Net Investment Income Tax (NIIT), and then again at the state's marginal rate — for many top earners that is 12.3% (or 13.3% with the MHST surcharge). The combined federal + California rate on long-term capital gains for top earners is approximately 37.1%, which is why California-based founders frequently consider Qualified Small Business Stock (Section 1202) exclusion timing or residency changes prior to a liquidity event.

Our Capital Gains Tax Calculator handles federal long-term and short-term rates including NIIT. To layer California on top, take the gain reported in that calculator and multiply by your California marginal rate from the bracket table.

Common mistakes California filers make

• Forgetting that California taxes RSU vesting as ordinary income at the full bracket rate, with no qualified dividend treatment even after holding shares 1+ years.
• Underwithholding when you have significant capital gains, RSU grants, or bonus income — California assesses a mandatory 10.23% supplemental withholding on bonuses and stock comp, but it is often still not enough at the top brackets.
• Missing the April 15 estimated tax deadline; California requires 30% of the prior-year liability with the Q1 voucher, not 25% like the federal schedule.
• Forgetting the SDI cap — for 2026 there is no taxable wage cap on SDI, meaning the 1.2% (approximate) SDI rate applies to your full earnings.

California tax planning tips for 2026

Max your 401(k) and HSA first. Both reduce California taxable income dollar-for-dollar — 401(k) contributions in 2026 are capped at $23,500 ($31,000 with the age-50 catch-up; $35,750 for ages 60–63 under SECURE 2.0). California conforms on 401(k) and HSA pre-tax treatment.

Bunch charitable deductions in alternating years if you are near the standard deduction threshold. Donor-advised funds let you front-load multiple years of giving while distributing grants over time.

If you own a pass-through business, evaluate the California Pass-Through Entity Elective Tax (PTET), which lets the entity pay state tax and deduct it federally — effectively restoring a SALT deduction up to the PTET payment.

Time the sale of appreciated assets across tax years and around residency changes. Establishing bona fide residency in a no-income-tax state before a major liquidity event requires substantial documentation; consult a CPA before relying on it.