If you run a short-term rental anywhere in California, the enforcement math changed on January 1, 2026. California SB 346 gives cities and counties the power to compel Airbnb, Vrbo, and other booking platforms to hand over detailed data about your listing — including the one thing hosts have long kept blurry: your physical address. Signed by Governor Newsom, the law turns the platforms themselves into a compliance-checking tool for local governments.
This isn't a new tax or a new permit. It's a new visibility. And for hosts who are already registered and paying their taxes, that's mostly fine. For everyone else, it closes the gap that made under-the-radar hosting possible.
(This is general information, not legal or tax advice. STR rules vary sharply by city — confirm your obligations with your local ordinance or a professional.)
What SB 346 actually does
Before SB 346, a city that suspected an illegal or unregistered rental often had to guess which unit an anonymized listing pointed to. The law removes that guesswork. It authorizes local governments to require hosting platforms to report data that ties each active listing to a real address and a real operator.
The key nuance: the law is not self-executing. The state didn't flip a switch statewide. Instead, each city or county must adopt an ordinance invoking the authority (Chapter 4.6 of the Government Code) before platforms are obligated to report to it. So whether SB 346 affects you today depends on whether your city has acted.
What data gets shared
Once a jurisdiction invokes the law, platforms must hand over listing-level detail. Reported fields typically include:
Host name and physical address of the listing
Number of nights booked per year
Registration or permit status
Assessor's parcel number (APN) and the listing URL
Cities can require these reports at least quarterly — or monthly, if that's how often transient occupancy tax (TOT) returns are due locally. In practice, that lets a city line up platform data against its own permit rolls and tax records and spot mismatches automatically.
How it's enforced
The teeth are pointed at the platforms, not directly at you. A marketplace that refuses to comply can face fines of up to $10,000 per day — a number large enough that Airbnb and Vrbo have every incentive to cooperate rather than shield hosts.
For hosts, the consequence is indirect but real: once your data lands on a city's desk, any gap — no permit, an expired registration, unpaid TOT, or exceeding a night cap — becomes trivially easy to flag and act on.
What it means for hosts
The honest read: SB 346 doesn't punish compliant hosts. It punishes invisibility. If your listing is registered, permitted, and current on TOT, the new reporting mostly confirms what the city already knows. The hosts exposed are the ones who were counting on not being matched to an address.
It also changes the risk calculus for whole markets. Cities that already cap nights or require primary-residence hosting can now enforce those rules at scale, listing by listing. If you operate near the edge of your local rules, that edge just got a lot brighter.
What to do now
Confirm your city's status. Check whether your city or county has adopted an SB 346 ordinance and what its reporting cadence is.
Get registration and permits current. An expired STR permit or missing registration is the single easiest thing for a city to catch under the new data flow.
Stay clean on TOT. Reported nights booked will be compared against your tax filings. Reconcile them. Our guide to Airbnb taxes for US hosts covers the filing side.
Keep your own records. Track nights, revenue, and permit dates so you can answer a city query without scrambling.
None of this is about hiding better — that door is closing. It's about being the host whose paperwork already matches what the platform reports. If you're rethinking how you price and position now that the rules are tighter, our pieces on pricing your Airbnb and the 2026 host fee changes pair well with getting compliant.
The law took effect on January 1, 2026. However, it is not self-executing — a city or county must adopt an ordinance invoking it before platforms are required to report data to that jurisdiction.
What data do platforms have to share?
Once a jurisdiction invokes the law, platforms must report listing-level data including host name, physical address, number of nights booked per year, registration or permit status, the assessor's parcel number, and the listing URL — typically at least quarterly.
Does SB 346 apply everywhere in California?
Not automatically. It gives every city and county the option to require this data, but each must adopt an ordinance to activate it. Whether you're affected today depends on whether your specific city has acted.
What happens to platforms that don't comply?
Marketplaces that refuse to share the required data can face fines of up to $10,000 per day, which strongly incentivizes Airbnb, Vrbo, and others to cooperate with participating cities.
I'm a registered host paying my taxes — should I worry?
Mostly no. SB 346 targets invisibility, not compliant operators. If your registration, permits, and transient occupancy tax are current, the reporting largely confirms what your city already has on file.
