Property Tax in Tiburon, California
California's property tax system runs on a fundamentally different logic than most of the country -- assessed value is tied to purchase price under Proposition 13, not to a county's periodic reappraisal of current market value -- and that difference matters enormously in a market like Tiburon where prices have risen for decades and a longtime owner's tax bill can be a small fraction of what a new buyer next door will pay on an identical home.
Proposition 13, in Plain Terms
California voters passed Proposition 13 in 1978, and it remains the foundation of every property tax bill in the state, including Tiburon's. The core mechanism: a home's assessed value is set at its purchase price in the year it's bought (or, for existing owners, at whatever assessed value they've carried forward), and that assessed value can then rise by at most 2% per year regardless of how much the home's actual market value increases -- until the property changes hands again, at which point it's reassessed to the new purchase price. The base ad valorem tax rate on top of that assessed value is capped at 1% under Prop 13 itself, with additional voter-approved bond and assessment levies added on top.
The practical effect in a long-appreciating market like Tiburon is a real and sometimes striking gap between neighbors: a family that bought a Paradise Drive home in the 1990s for a few hundred thousand dollars, with 2% annual caps compounding since, can carry an assessed value and a tax bill dramatically lower than a buyer purchasing the house next door today for $4M or $5M. This isn't a Tiburon-specific quirk -- it applies statewide -- but it's especially visible in a market where home values have risen as sharply as they have here.
Marin's 368 Tax Rate Areas -- Why a Single Townwide Number Doesn't Exist
Marin County is divided into 368 separate Tax Rate Areas (TRAs), each reflecting a different combination of overlapping taxing jurisdictions -- the county itself, the Town of Tiburon (or, for an adjacent parcel, the separately incorporated City of Belvedere), the Reed Union School District, the Tamalpais Union High School District, Marin Community College District, and any applicable special districts (fire protection, flood control zones, lighting/landscaping districts) -- each of which can carry its own voter-approved bond measure adding a small percentage on top of the Prop 13 base. The result: for FY2025-26, the total ad valorem rate across Marin's various TRAs runs roughly 1.065% to 1.221% of assessed value, with a new buyer's effective rate generally falling between 1.0% and 1.25% once typical bond overlays are included.
That means two homes a few blocks apart in Tiburon -- one inside the town limits, one just across a boundary line in unincorporated Marin or in Belvedere -- can carry genuinely different effective tax rates purely because of which TRA and which set of overlapping special-district bonds apply. This page does not have a confirmed rate for any single specific address or TRA, since that requires looking up the exact parcel; the Marin County Assessor-Recorder-County Clerk's office can provide that on request for a specific property.
A Worked Example
Take a hypothetical $3.1 million Tiburon home purchase -- roughly Zillow's mid-2026 average home value for the town. At a 1.0% effective rate (the low end of the typical new-buyer range), the annual property tax bill would run approximately $31,000. At a 1.25% effective rate (the high end), it would run approximately $38,750. That's a real, budget-relevant $7,750 annual swing purely from which Tax Rate Area a specific parcel sits in -- before any Mello-Roos community facilities district assessment (uncommon in an established town like Tiburon compared to newer master-planned developments, but always worth confirming) or any parcel-specific special assessment is added.
This worked example uses Zillow's published average value and Marin County's published effective-rate range; it is illustrative, not a quote for any specific property. A buyer should request the actual current tax bill and Tax Rate Area for any address under serious consideration directly from the seller's disclosures or the Marin County Assessor's office before relying on an estimate.
Reassessment Exclusions Worth Knowing About
California law provides several exclusions from full reassessment that matter for Tiburon buyers and sellers alike: transfers between spouses, and certain transfers between parents and children or grandparents and grandchildren (subject to Proposition 19's 2021 changes, which narrowed the parent-child exclusion considerably and requires the property to become the recipient's primary residence within a set window to retain any exclusion), and Proposition 19's separate portability provision letting eligible owners 55 and older, severely disabled owners, or wildfire/disaster victims transfer their existing assessed value to a replacement home purchased anywhere in California, up to three times.
That portability provision is directly relevant to Tiburon's retiree-heavy demographic (median age 51.6 per Census-derived data): a longtime Marin homeowner selling elsewhere in the county and buying in Tiburon, or vice versa, may be able to carry a much lower assessed value into the new purchase rather than resetting to full current market value -- a meaningful, sometimes six-figure-per-year difference. This page does not provide tax advice; confirm eligibility and the exact mechanics with a California property tax professional or the Marin County Assessor's office before assuming portability applies to a specific transaction.
How the Town of Tiburon Itself Depends on This Revenue
Property tax is not an abstract line item for Tiburon's own municipal finances -- it is, by a wide margin, the town's largest general fund revenue source. The Town of Tiburon's own budget documents put property tax receipts at roughly 58% of projected general fund operating revenue in fiscal year 2024, with sales, transfer, and transient occupancy taxes together making up a much smaller combined share. That dependence is one practical reason the town's land-use and zoning decisions -- including its long-standing preference for low-density, owner-occupied housing over higher-turnover rental or commercial development -- track closely with protecting a stable, appreciating residential tax base rather than chasing tourism-tax revenue the way a beach resort town might.
The town's budget materials describe a track record of balanced budgets and maintained fund reserves, which is a reasonable, if indirect, signal of fiscal stability for a prospective owner weighing whether the town's finances are sound -- though this page does not have a confirmed current reserve-fund dollar figure and does not estimate one.
What This Page Does Not Know
This page does not have a confirmed effective tax rate for any specific Tiburon parcel or Tax Rate Area, a confirmed current Mello-Roos assessment status for any specific development, or a confirmed current fund-reserve balance for the Town of Tiburon. Marin's 368-TRA system means a genuinely precise answer requires looking up the specific parcel.
For an exact current tax bill or rate on a specific address, contact the Marin County Assessor-Recorder-County Clerk's office directly, or request the seller's most recent property tax bill as part of due diligence.
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Get a Free Agent Referral →Independent research. No ads. No sponsored listings. Data sourced from: propertytaxrates.org, propertytaxalmanac.com, taxbycounty.com, and Ownwell's Marin County property tax pages for the FY2025-26 effective-rate range and the 368 Tax Rate Area structure; the California State Board of Equalization's own published guidance on Proposition 13 and Proposition 19 for the assessed-value-cap and portability mechanics; and the Town of Tiburon's own FY2024 budget documents (townoftiburon.org) for the 58% general-fund property-tax-revenue share. Facts not independently confirmed and not invented here include: the exact effective rate for any specific Tiburon parcel or Tax Rate Area; current Mello-Roos assessment status for any specific development; and the Town of Tiburon's current fund-reserve balance. Confirm all current figures with the Marin County Assessor-Recorder-County Clerk's office and a California property tax professional before relying on any number in a purchase decision. Nothing on this page is legal or tax advice.