California SB 346 and Your STR. What the New Facilitator Act Means for Hosts

California’s SB 346, signed into law on October 13, 2025, and effective as of January 1, 2026, gives every city and county in the state the authority to force Airbnb, Vrbo, and similar platforms to hand over detailed data on every short-term rental listing in their jurisdiction. If you operate an STR anywhere in California and you have been skating by without a local license or TOT registration, your window just closed. The platforms that once served as a comfortable buffer between you and city hall are now required (once your city adopts the right ordinance) to tell local officials exactly where your rental is, what your listing URL looks like, and whether you have the paperwork to prove you are operating legally.

I have reviewed a lot of state-level STR legislation over the years, and most of it falls into one of two categories: toothless gestures or heavy-handed bans. SB 346 is neither. It is a precision tool, designed not to regulate hosts directly but to conscript the platforms into doing the enforcement legwork that cities have struggled with for over a decade.

What SB 346 Actually Does

The Short-Term Rental Facilitator Act of 2025 (Government Code sections 50990 through 50996) does not impose any new taxes, create any new permit requirements, or ban any type of rental. What it does is give local agencies (cities, counties, and city-counties) the legal authority to require STR platforms to report specific information about every listing operating within their borders.

That sounds simple. It is not.

Before SB 346, California cities that wanted to know which properties were being listed on Airbnb had to negotiate directly with the platforms. Some cities, like Los Angeles and Monterey County, managed to secure voluntary data-sharing agreements or passed their own local ordinances. Most did not. The platforms had little legal incentive to cooperate, and cities lacked the statutory authority to compel them.

SB 346 changes that dynamic entirely. Senator Maria Elena Durazo (D-Los Angeles), who authored the bill, framed it plainly: “For too long, platforms like Airbnb have profited while local governments struggle to collect taxes they’re owed and enforce laws their communities have voted for.”

The Data Platforms Must Report

Once a city or county adopts an ordinance invoking SB 346, platforms operating in that jurisdiction must report the following for every listed STR property:

• Physical address, including the nine-digit ZIP code
• Assessor parcel number (APN), if the address alone is insufficient to identify the property
• Listing URLs for each property
• Unit-specific identification for multi-unit properties, accessory dwelling units (ADUs), and timeshares

Platforms must also display any applicable local license number and transient occupancy tax certification directly in the listing itself. If you have ever wondered why some Airbnb listings in places like Los Angeles already show a registration number, this is that concept scaled to the entire state.

The reporting frequency defaults to quarterly, but cities that require monthly TOT remittance can demand monthly reporting on the same schedule. That means platforms could be filing data with dozens (potentially hundreds) of California jurisdictions on a rolling basis.

The “Not Self-Executing” Catch

Here is the part that matters most for hosts trying to figure out whether this affects them right now. SB 346 is an enabling statute. It does not automatically apply anywhere. Each individual city or county must pass its own ordinance to activate the law’s reporting requirements within its jurisdiction.

Think of it like a loaded weapon that the state just placed on the table. It does nothing until a city picks it up.

Some jurisdictions will move quickly. Cities that have been battling unlicensed STRs for years (San Francisco, Santa Monica, Palm Springs, San Diego, and others with existing permitting frameworks) now have a much simpler legal path to compel platform cooperation. They do not need to negotiate. They do not need to threaten litigation. They adopt an ordinance, and the platforms are legally obligated to comply.

Other jurisdictions, particularly smaller cities and rural counties that have not yet adopted STR-specific regulations, may take longer. Some may never adopt SB 346 ordinances at all. The law preserves full local control (Government Code section 50996 explicitly states it does not preempt existing or future local STR regulations), so the patchwork nature of California’s STR landscape will persist.

Penalties for Noncompliance

SB 346 ties its enforcement teeth to Government Code section 53069.4, which authorizes administrative fines for ordinance violations. The penalty structure for STR-related infractions under California law allows:

• $1,500 for a first violation
• $3,000 for a second violation of the same ordinance within one year
• $5,000 for each additional violation within one year

These are the statutory maximums under Government Code section 36900(b) for STR infractions that pose a threat to public health or safety. Individual cities set their own penalty amounts by ordinance, and some jurisdictions have signaled willingness to pursue fines of up to $10,000 per day for platform noncompliance.

To be clear, these penalties are aimed primarily at the platforms, not individual hosts. The enforcement mechanism targets facilitators (that is the legal term for Airbnb, Vrbo, and their competitors) who fail to file required reports. But hosts should not take false comfort from that distinction. If the platform reports your address and you lack the required local license or TOT registration, you are the one the city will come after next.

The Audit Power

Section 50995 of the new law authorizes local agencies to audit STR facilitators and examine their records documenting the receipt and remittance of transient occupancy taxes. The catch (and it is a meaningful one) is that the local agency bears the cost of the audit.

For large cities with dedicated revenue departments, this is manageable. For smaller municipalities, the cost of auditing a major platform could be prohibitive. This is one area where the law’s practical impact may not match its statutory ambition, at least in the short term.

Picture this: you are a host running three unlicensed STRs in a mid-sized California city. Until now, the city knew you existed only if a neighbor complained. Under SB 346, once your city adopts the ordinance, Airbnb is legally required to hand over your property addresses, your listing URLs, and whether you have a license number on file. The city does not need to find you. The platform delivers you to them on a quarterly report.

Who Supported SB 346 (and Why It Passed Unanimously)

The bill passed the Assembly 64-0 and received unanimous Senate concurrence. That kind of bipartisan support is rare for any legislation, let alone a bill that directly regulates the operations of multi-billion-dollar technology platforms.

The California League of Cities sponsored the bill, along with the Association of County Treasurers and Tax Collectors. Carolyn Coleman, Executive Director of the League of California Cities, said the measure “ensures that every California city has the information needed to enforce its local short-term rental laws, crack down on illegal units and collect the correct amount of transient occupancy taxes owed to them.”

The platform lobby did not mount serious opposition. Airbnb, which has historically pushed back against heavy-handed local STR regulations, appears to have calculated that data-sharing requirements are preferable to the alternative: city-by-city bans and permit caps. Transparency obligations are costly and operationally complex, but they are survivable. Prohibition is not.

What This Means for California STR Hosts and Investors

If you are operating a licensed, tax-compliant STR in California, SB 346 changes very little about your day-to-day operations. Your license number will appear in your listing (if it does not already), your city will have your address on file (they already do), and your TOT payments will continue as before.

If you are operating without proper licensing or TOT registration, the calculus changes significantly. Here is what you should do now:

Check your city’s STR ordinance status. Find out whether your city or county has already adopted (or is in the process of adopting) an ordinance invoking SB 346. Your city clerk’s office or planning department is the right starting point.

Get licensed. If your jurisdiction requires an STR permit or license and you do not have one, apply now. The grace period between “nobody was checking” and “the platform just reported your address” is closing fast in cities that adopt SB 346 ordinances.

Register for TOT. Transient occupancy tax registration is separate from your STR permit in most California cities. Even if you rely on Airbnb to collect and remit TOT on your behalf (which Airbnb does in many California jurisdictions), you may still need a TOT certificate number to display in your listing.

Verify your listing information. Once your city adopts an SB 346 ordinance, the platform will be required to display your license number and TOT certification in your listing. Make sure those numbers are accurate and current. An expired or incorrect license number is not much better than no license number at all.

Keep records. The audit provisions of SB 346 apply to platforms, but audits have a way of cascading. If a platform audit reveals discrepancies in TOT collection for your property, the city’s next call will be to you.

The Bigger Picture for California STR Markets

According to Senator Durazo’s office, an estimated 25% to 75% of short-term rentals in California operate without proper licenses. That is an enormous range, but even the conservative end means one in four California STRs is operating outside the regulatory framework.

SB 346 will not fix that overnight. The law’s effectiveness depends entirely on local adoption, and California has over 480 cities and 58 counties, each with its own political dynamics around housing, tourism, and tax revenue. But the trend line is clear. Cities that have been losing the enforcement battle against unlicensed STRs now have a straightforward, legislatively backed tool to level the playing field.

For investors evaluating California STR markets, this law adds another variable to the due diligence checklist. Before acquiring a property for short-term rental use, you need to know not just whether the city allows STRs under state and local law, but whether the city has adopted (or plans to adopt) SB 346 reporting requirements. A city with SB 346 in effect is a city where unlicensed operators will be identified and fined, which can be a competitive advantage for hosts who do things by the book.

During my time clerking for Judge Morrison, I learned that the most effective regulations are not the ones with the harshest penalties. They are the ones that make compliance easier than evasion. SB 346 fits that mold. It does not punish hosts for operating STRs. It simply makes it much harder to operate invisibly.

This article provides general information and should not be construed as legal advice. Consult a qualified attorney in your jurisdiction for advice specific to your situation.

We do our best to keep our regulatory guides accurate and up to date, but ordinances change and we are only human. Always verify current requirements directly with your local municipality before making business decisions.

Run the Numbers for California

Curious what a short-term rental in California could actually earn? Our free California Airbnb Calculator pulls real market data so you can estimate revenue, occupancy rates, and expenses before you commit.

For a deeper look at the California market including active rental counts, average daily rates, and neighborhood-level data across 362 cities, check out our California market profile.

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