Property Tax in Belvedere, California
California runs property tax on a fundamentally different logic than most of the country, and that logic matters enormously in a market like Belvedere, where prices have risen for decades and where a small, wealthy, long-tenured resident base can carry assessed values dramatically below current market value. Here is how the actual mechanism works, what Belvedere's own city government gets out of it, and what this page could not pin down to a specific parcel.
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, Belvedere's included. The mechanism: a home's assessed value is set at its purchase price in the year it's bought, then capped at a maximum 2% annual increase regardless of how much the home's actual market value rises -- until the property changes hands again, at which point the county reassesses it to the new purchase price. On top of that assessed value, the base ad valorem rate is capped at 1% under Prop 13 itself, with additional voter-approved local bond and assessment levies added on.
The practical effect in a market where prices have climbed as sharply as Belvedere's is a real, sometimes striking gap between neighbors: an owner who bought a Belvedere Island home decades ago, with 2% annual caps compounding ever since, can carry an assessed value -- and a tax bill -- a fraction of what a buyer purchasing an equivalent home today would pay. This isn't a Belvedere quirk; it's the same mechanism that applies statewide. But it's an especially visible dynamic in a small, tightly held market where long ownership tenures are common.
Two Disagreeing Effective-Rate Estimates -- and Why Neither Is a Quote
This research turned up two different published effective-rate figures for Belvedere specifically, and rather than pick one and present it as fact, this page states both. One property-tax data aggregator puts Belvedere's median effective property tax rate at 1.30% -- meaningfully above both the national median (roughly 1.02%) and the California statewide median (roughly 1.21%) it cites for comparison -- with a median annual tax bill of $25,472. A separate townwide comparison of ad valorem rates across Marin municipalities puts Belvedere and neighboring Tiburon together at roughly 1.097% for FY2025-26, closer to the low end of Marin's town-by-town range.
The gap between 1.097% and 1.30% is real and, on a multimillion-dollar Belvedere home, translates to a meaningful annual dollar difference -- roughly $12,000 a year apart on a $6 million assessed value. Marin County's tax-rate-area system, where overlapping school, community-college, and special-district bond measures stack on top of the 1% Prop 13 base differently parcel by parcel, is the likely source of that disagreement: different sampled properties in different Tax Rate Areas would genuinely carry different effective rates, and a single townwide average can't capture that. This page does not resolve the gap; it states it as a real, disclosed uncertainty.
Belvedere's Own Cut: the City Gets 20.7% of the Base 1%
One figure this research could confirm with more confidence, because it comes from Marin County's own tax-distribution records rather than a third-party estimate: the City of Belvedere itself receives 20.7% of the basic 1.0% ad valorem property tax collected on Belvedere parcels. The rest is distributed among Marin County government, Marin County schools and the Marin Community College District, and any applicable special districts. That 20.7% share is a genuinely useful number for understanding Belvedere's own municipal finances -- it's the direct funding mechanism behind the seismic-and-flood Critical Infrastructure Project and the Beach Road Sea Wall Stabilization Project covered on the Storm Prep Costs page, since a city this small, with essentially no commercial tax base of its own, depends on residential property tax revenue for nearly everything it does.
This page does not have a confirmed current total dollar figure for Belvedere's own annual property-tax revenue or general-fund budget size, and does not estimate one. For that level of detail, the City of Belvedere's own published budget documents are the right source.
A Worked Example
Take a hypothetical $6 million Belvedere home purchase -- roughly the middle of the disagreeing 2025-2026 price snapshots cited on the Real Cost page. At the lower 1.097% effective-rate estimate, the annual property tax bill would run approximately $65,820. At the higher 1.30% estimate, it would run approximately $78,000. That's a real, budget-relevant roughly $12,000 annual swing purely from which effective-rate estimate -- and, underlying it, which specific Tax Rate Area -- applies to a given parcel, before any Mello-Roos assessment or other parcel-specific special levy is added.
This worked example is illustrative only, built from two published estimates rather than a specific parcel's actual assessed value. A buyer should request the seller's most recent actual property tax bill, or the exact current assessed value and Tax Rate Area from the Marin County Assessor's office, before relying on any number here for a real purchase decision.
Reassessment Exclusions and Portability -- Real, but Not Independently Re-Verified for Belvedere
California law provides statewide exclusions from full reassessment that apply in Belvedere the same as anywhere else in the state: transfers between spouses, certain parent-child transfers narrowed by Proposition 19's 2021 changes, and Prop 19's separate base-year-value portability provision letting eligible owners 55 and older, severely disabled owners, or wildfire/disaster victims carry their existing assessed value into a replacement home purchased anywhere in California, up to three times. Given Belvedere's genuinely wealthy, long-tenured, retiree-skewing resident base, that portability provision is directly relevant to a meaningful share of the local buyer pool -- a longtime Marin homeowner selling elsewhere in the county and buying in Belvedere may be able to carry a far lower assessed value into the purchase than the property's full current market value would otherwise trigger.
This page did not independently re-verify Prop 19's current eligibility mechanics beyond the general statewide framework, and doesn't provide tax advice. Confirm eligibility and exact mechanics with a California property tax professional or the Marin County Assessor's office before assuming portability applies to a specific transaction.
What This Page Does Not Know
This page does not have a confirmed effective tax rate for any specific Belvedere parcel or Tax Rate Area -- it has two disagreeing townwide estimates, stated as such -- nor a confirmed current Mello-Roos status for any specific property, nor a confirmed total current annual property-tax revenue figure for the City of Belvedere's own budget.
The Marin County Assessor-Recorder-County Clerk's office can pull the actual current rate and bill for a specific address; short of that call, asking the seller for their most recent property tax bill during due diligence gets you the real number without waiting on the county.
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Get a Free Agent Referral →Independent research. No ads. No sponsored listings. Data sourced from: Ownwell's Belvedere, Marin County property tax page for the 1.30% median effective rate, $25,472 median annual bill, and its national/state comparison figures; taylorleerealestate.com's Marin property tax guide for the roughly 1.097% Belvedere/Tiburon ad valorem comparison figure; Marin County's own tax-distribution page (marincounty.gov) for the City of Belvedere's confirmed 20.7% share of the basic 1.0% property tax; and the California State Board of Equalization's own published guidance on Proposition 13 and Proposition 19 for the assessed-value-cap and portability mechanics, which apply statewide and were not re-verified specifically against a Belvedere transaction this pass. Facts not independently confirmed and not invented here include: the exact effective rate for any specific Belvedere parcel or Tax Rate Area (two disagreeing townwide estimates are presented instead of one invented figure); current Mello-Roos assessment status for any specific property; and the City of Belvedere's current total annual property-tax revenue or general-fund size. 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.