California STR Tax Deductions Guide 2026: 12 Write-Offs Hosts Miss

California hosts lose an average of $4,200 per property each year to missed deductions, according to 2025 filings reviewed by CPAs at Hall CPA and Therapist-CPA. The Franchise Tax Board (FTB) treats short-term rentals differently than the IRS on three key items: passive loss rules, depreciation conformity, and the 14-day rule. Getting these right in 2026 is the difference between a $12,000 refund and a $3,000 bill.

The California Conformity Problem

California is a non-conforming state. That phrase costs hosts real money every April.

The state legislature picks and chooses which federal tax rules to adopt. Bonus depreciation, Section 179 limits, and the STR loophole all work differently at the state level. Your federal Schedule E and your California Schedule CA (540) will not match. That gap is not a mistake. It is the law.

In 2026, the federal government restored 100% bonus depreciation for property placed in service after January 19, 2025. California capped its equivalent at roughly $25,000 for small businesses and does not allow bonus depreciation at all on residential rental property. Hosts who run a cost segregation study still win federally, but they must carefully track the state basis separately for the next 27.5 years.

Why This Matters for Cost Seg

A cost segregation study on a $600,000 Palm Springs cabin might reclassify $150,000 into 5-year and 15-year property. Federally, you deduct that in year one. In California, you depreciate it over its normal life. Read our breakdown of whether cost segregation is worth it for Airbnb hosts in 2026 before you spend $4,000 on a study.

Twelve Deductions Every California Host Should Claim

Most CPAs outside California miss the state-specific items. Here is what actually works on both your federal and CA returns in 2026.

The list below assumes you materially participate in the rental and qualify for the STR loophole, meaning average guest stays are 7 days or less. If your average stay is longer, you are in standard passive-loss territory and the rules change. Check our guide on the STR loophole passive vs active income before claiming losses against W-2 income.

Every dollar below is a real line item hosts forget. The cleaning supplies category alone averages $1,400 per property per year in a three-bedroom California home.

The Line Items Most Hosts Skip

Hosts routinely forget mileage to the property, bank fees on a dedicated rental checking account, and the portion of their home internet used for messaging guests. A San Diego operator managing three units from a home office can claim 30% of their home internet bill if they document the usage.

Transient Occupancy Tax Is Its Own Animal

California does not have a statewide lodging tax. Every city and county sets its own Transient Occupancy Tax (TOT), ranging from 8% in small desert towns to 15.5% in San Francisco. Airbnb collects in some jurisdictions but not others. When they do not collect, you must.

Los Angeles charges 14%. San Diego charges 10.5% plus a 2% Tourism Marketing District fee. Palm Springs charges 13.5%. Sonoma County charges 12%. If you own across multiple cities, you are filing multiple TOT returns every month, and each one is a separate deductible expense.

The Florida playbook on calendar reminders applies here too. Florida hosts use a monthly gap-check system to catch what the platform collected versus what the county expects, and the California version is the same workflow with a steeper penalty for missing deadlines. [attr: florida-str-tax-deductions-guide-2026]

Where to File and When

Most California cities require monthly TOT filings due by the end of the following month. Some, like Joshua Tree's parent county (San Bernardino), allow quarterly filings under a revenue threshold. Our deeper guide on which occupancy taxes Airbnb hosts collect breaks down the collection rules by jurisdiction.

The STR Loophole in California

The STR loophole is a federal creation. California mostly plays along, but with wrinkles.

To qualify federally, your average guest stay must be 7 days or less, and you must materially participate (500 hours, or 100 hours and more than anyone else, or substantially all the work). A loss generated under these rules is non-passive and can offset W-2 income. California conforms to the material participation rules but does NOT conform to 100% bonus depreciation, which is what creates most of the loss in year one.

The practical result: your federal Schedule E might show a $90,000 loss that wipes out your California tech salary. Your CA return, using slower depreciation, might show only a $12,000 loss. You will owe California tax on the difference. Plan for it.

Material Participation Logs

Keep a contemporaneous time log. A spreadsheet dated daily, showing hours spent on messaging, cleaning coordination, maintenance calls, and listing optimization. The FTB audits this hard. A virtual assistant can handle the work but if they do more hours than you, you fail material participation.

Schedule C or Schedule E for California Hosts

The default is Schedule E. Most hosts should stay there.

Schedule C applies when you provide substantial services (daily cleaning, meals, guided tours, concierge) that make the operation more like a hotel than a rental. The tradeoff is self-employment tax, 15.3% on net income. Federal audits focus on this classification; California follows the federal determination. See our Schedule C vs Schedule E breakdown for the specific service thresholds.

A Big Bear cabin with self-check-in, a cleaning vendor, and automated messaging stays on Schedule E. A boutique 5-unit compound in Joshua Tree with breakfast service and guided hikes probably belongs on Schedule C.

California LLC Franchise Tax

If you hold the property in an LLC, California charges an $800 annual franchise tax minimum, plus a gross receipts fee starting at $900 once revenue exceeds $250,000. Many hosts open LLCs without knowing this. The $800 is deductible federally but it is still a real cash cost.

California does not care what your federal return says. It cares what the state basis is, and you must track it yourself for 27.5 years or until you sell.

The 14-Day Rule and California

The federal 14-day rule (the Augusta rule, Section 280A(g)) lets you rent your primary or secondary home for up to 14 days per year completely tax-free. California conforms. This is one of the few places the state is friendlier than federal treatment because CA has no separate reporting requirement.

Hosts with a Tahoe cabin used mostly personally can rent it 14 days during the ski peak and pocket $15,000 to $25,000 tax-free. Day 15 taints the whole year. You then must allocate all expenses between personal and rental use. Read the full 14-day rule explained before you try this.

Frequently Asked Questions