Costa Mesa Registration Rules Rules (2026): What You Need to Know
Heavy RestrictionsKey Facts
- Permit Number Display
- Must be prominently shown on all listings and advertisements
- TOT Registration
- Must register with Finance Division before first guest stay
- TOT Filing
- Quarterly returns required, including zero returns for quarters with no activity
- Record Keeping
- Guest stay records must be maintained for a minimum of 3 years
- Platform Cooperation
- Hosting platforms expected to remove unpermitted listings upon city notification
- Compliance Monitoring
- City conducts periodic checks through platform monitoring and complaint investigation
The Short Version
Costa Mesa requires all short-term rental operators to register their property with the city and comply with specific advertising and listing rules. Every STR listing on any platform (Airbnb, VRBO, Booking.com, or direct website) must prominently display the city-issued STR permit number. Listings that do not include a valid permit number are presumed to be operating unlawfully, and hosting platforms are expected to cooperate with the city in removing unpermitted listings upon notification. Operators must register with the city's Finance Division for Transient Occupancy Tax collection before their first guest stay. TOT returns must be filed and remitted quarterly, even in quarters with no rental activity (a zero return is required). The current TOT rate is consistent with the rate applied to hotels and motels within the city. Operators must maintain records of all guest stays, including dates, number of guests, and TOT collected, for a minimum of three years. The city maintains an active STR registry and conducts periodic compliance checks through platform monitoring and complaint investigation. Operators who fail to maintain current registration, fail to display their permit number, or fail to file TOT returns are subject to administrative action including fines, back-tax assessments, and permit revocation.
Full Breakdown
Costa Mesa requires all short-term rental operators to register their property with the city and comply with specific advertising and listing rules. Every STR listing on any platform (Airbnb, VRBO, Booking.com, or direct website) must prominently display the city-issued STR permit number. Listings that do not include a valid permit number are presumed to be operating unlawfully, and hosting platforms are expected to cooperate with the city in removing unpermitted listings upon notification.
Operators must register with the city's Finance Division for Transient Occupancy Tax collection before their first guest stay. TOT returns must be filed and remitted quarterly, even in quarters with no rental activity (a zero return is required). The current TOT rate is consistent with the rate applied to hotels and motels within the city. Operators must maintain records of all guest stays, including dates, number of guests, and TOT collected, for a minimum of three years.
The city maintains an active STR registry and conducts periodic compliance checks through platform monitoring and complaint investigation. Operators who fail to maintain current registration, fail to display their permit number, or fail to file TOT returns are subject to administrative action including fines, back-tax assessments, and permit revocation.
What Happens If You Violate This?
Failure to display a valid STR permit number on a listing is an infraction carrying fines of $250 per listing per day. Operating without proper TOT registration results in back-tax assessments plus a 25% penalty on unpaid taxes and interest at the rate of 1.5% per month. Failure to file quarterly TOT returns incurs a $100 late filing penalty per return. Operators found to have multiple listing or registration violations may face permit suspension or revocation. The city works with major hosting platforms to identify and remove unpermitted listings. Property owners who allow tenants to operate unpermitted STRs may also be held liable for violations and back taxes. Chronic registration violations may be referred to the City Attorney for prosecution as misdemeanors, with penalties of up to $1,000 per day and/or up to six months in county jail.
Frequently Asked Questions
Do I need to show my permit number on my Airbnb listing in Costa Mesa?
How often do I need to file TOT returns in Costa Mesa?
What records do I need to keep as a Costa Mesa STR operator?
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