Proposition 13

Proposition 13 (officially the People's Initiative to Limit Property Taxation) is a landmark amendment to the California Constitution enacted on June 6, 1978, which fundamentally reshaped property taxation across the state, including in San Francisco. The measure was designed to cap property taxes and limit property reassessments to when a property changes ownership, and to require a two-thirds majority for tax increases in the state legislature. California voters overwhelmingly approved the initiative, and it represented the taxpayers' collective response to dramatic increases in property taxes and a growing state revenue surplus of nearly $5 billion — measured in 1978 dollars — that the legislature had declined to return to taxpayers. Because San Francisco is among California's most expensive real estate markets, the law has had an especially pronounced effect on the city's property tax landscape, generating both measurable financial benefits for long-time property owners and sustained debate over equity, public services, and housing affordability.

Background and Origins

In June 1978, Proposition 13 passed with 65% of the vote, becoming one of the most consequential ballot measures in California history. It was a response to skyrocketing property taxes caused by rampant inflation throughout the 1970s, which had driven home values — and the tax bills attached to them — to levels many middle-class homeowners could no longer afford. The measure fundamentally changed property taxation in California by capping the tax rate at 1% of assessed value and limiting annual increases to 2% until a change of ownership or new construction triggered a reassessment.

Prior to the initiative's passage, local governments in California — including San Francisco — independently set their own property tax rates and received the proceeds of those taxes directly. For the first time in California's history, the state government was put in charge of allocating the proceeds of the locally levied property tax. This decentralized system, combined with rapid appreciation in home values throughout the 1970s, led to tax bills that many homeowners found unmanageable. The California legislature adjourned in the fall of 1977 without passing any significant property tax reforms, even though 22 different reform plans were proposed, setting the stage for a citizen-led initiative. The measure was championed by anti-tax crusader Howard Jarvis, whose years of advocacy culminated in the June 1978 primary election.

Proposition 13 also required that all state tax increases be approved by two-thirds of the legislature and that special taxes levied by local governments be approved by two-thirds of voters. Requiring this supermajority vote to pass any new local taxes or municipal bond offerings was a crucial component of the measure, significantly raising the bar for government revenue increases at every level.

Key Provisions

Proposition 13 established the concepts of a base year value for property tax assessments and set firm limitations on both the tax rate and the permissible annual increase in assessed value for real property. Together, these provisions created a system that has defined California's property tax landscape for nearly five decades.

The most immediate and visible provision is the one percent rate cap: under Proposition 13, property taxes are limited to one percent of the assessed value of a property. Additional property taxes may be approved for schools or local projects, which can vary among communities and bring the effective tax rate somewhat above one percent, but the baseline is strictly capped by the state constitution.

The law also executed a sweeping rollback of assessed values when it took effect. Proposition 13 rolled back most local real property assessments to 1975 market value levels and limited future property tax increases from that baseline. Once the measure passed, property assessments for the 1978–79 fiscal year were required to be rolled back to 1975–76 values, establishing the first base year values in California. This meant that owners who had watched their paper property values — and their tax bills — balloon over the preceding three years received immediate and substantial relief.

Going forward, the law limits annual increases in assessed value to no greater than 2% per year, regardless of how much a property's actual market value may appreciate. This protection persists until a change in ownership occurs, whether full or partial, at which point the property is reassessed at its current market value as of the date of transfer. That transfer establishes a new base year value for both the land and any improvements on it, resetting the clock on the 2% annual cap for the new owner. The result is a system in which two neighbors owning identical homes can pay vastly different property taxes depending solely on when each purchased their respective properties.

Subsequent Amendments

Proposition 13 as originally enacted has been modified several times by subsequent ballot measures that altered its rules for specific categories of owners. Proposition 58 (1986) exempted transfers between parents and children from reassessment, allowing families to pass property to the next generation while retaining the original base year value. Proposition 60 (1986) and Proposition 90 (1988) allowed homeowners aged 55 and older to transfer their base year value to a replacement residence of equal or lesser value, under certain conditions, providing a mobility incentive for senior homeowners.

The most significant recent modification came with Proposition 19 (2020), which substantially narrowed the parent-child transfer exemption established by Proposition 58 while expanding base year value portability for seniors, severely disabled homeowners, and victims of natural disasters. Under Proposition 19, inherited properties that are not used as a primary residence by the heir are subject to full reassessment at current market value, a change that dramatically reduced the wealth-transfer benefits of the original law for investment and rental properties. The measure took effect in February 2021 and represented the most consequential amendment to Proposition 13's framework since the measure's original passage.

Effects on San Francisco

San Francisco, as one of California's most expensive real estate markets, experiences some of the most striking divergences between assessed and market values under Proposition 13. The law disproportionately affects coastal metropolitan areas such as San Francisco and Los Angeles, where housing prices are substantially higher than in inland communities, meaning the gap between a property's taxable value and its true market value tends to be wider.

The scale of this gap can be substantial. In a report using data provided by online brokerage Redfin, the San Francisco Chronicle scrutinized the size of the difference between assessed and actual values and the resulting tax savings in counties around the state. In San Francisco, the average home was assessed at $1.01 million but carried an actual market value of $1.58 million. Thanks to that difference, typical homeowners were paying roughly $5,700 less in property tax each year than they would have owed if Proposition 13 were not in place.

This disparity can produce extreme results for individual properties. The owner of a 6,740-square-foot mansion in San Francisco estimated to be worth $9 million paid $5,625 in property taxes in 2020, according to the Tax Fairness Project, which analyzed county tax records and market values. Across the bay in Richmond, the owner of a 991-square-foot home worth $331,000 and in need of repairs paid nearly as much tax — $5,240 — illustrating how the law's protections accrue most powerfully to long-term owners in appreciating markets rather than to homeowners in more modest circumstances.

Despite concerns about foregone revenue, the law also provides San Francisco with a measure of fiscal stability. Even in years when market values decrease, Proposition 13 acts as a stabilizing force on city revenues because the gap between taxable value and market value means that assessments do not need to be reduced in lockstep with market downturns. The two percent limit on annual increases in taxable value means that for cities like San Francisco, where market values have historically grown far faster than 2% annually, no overall reduction in tax assessments is required even when market prices fall. Total assessed property value in San Francisco grew 5.3% from fiscal year 2022 to 2023, according to the California Board of Equalization Annual Report, demonstrating that the city's property tax base has continued to expand even under the law's constraints.

The law's initial impact on local government finance was severe. After Proposition 13 passed, county property tax revenues statewide dropped from $10.3 billion in 1977–78 to $5.04 billion in 1978–79, plunging many local governments into fiscal crisis. Keeping local governments operating during the first two years following Proposition 13 required legislative bailouts to offset property tax revenue losses. Local governments became substantially more dependent on state funds, which increased state power over local communities. The state moved to provide block grants to cities to fund services and bought out some facilities that locally administered state-mandated programs — a structural shift in the relationship between California's state and local governments that has persisted ever since.

Equity Debates and Criticism

Proposition 13 has long been the subject of debate in San Francisco and across California, particularly regarding its equity implications. The law has been criticized by policy experts for effectively offering long-time homeowners substantial tax discounts relative to new buyers — a phenomenon sometimes described as a "welcome stranger" effect, in which newer residents bear a disproportionate share of the local property tax burden simply because they purchased more recently.

Research conducted by the Tax Fairness Project and the San Francisco Bay Area Planning and Urban Research Association found that the benefits of the law are not distributed evenly across communities. Homeowners in wealthy, white neighborhoods in Oakland received thousands of dollars more in annual property tax breaks than their counterparts in neighborhoods with large Black, Asian, and Latino populations, according to a report based on that joint study. The report's authors noted that "the wealthiest neighborhoods receive the most (breaks), which helps them build more wealth for communities that were already benefiting from lots of wealth," as stated by Jacob Denney, economic policy director at the San Francisco Bay Area Planning and Urban Research Association.

The fiscal cost of the law is also substantial. The system established through Proposition 13 in 1978 is estimated to cost the state approximately $45 billion per year in foregone revenue — and possibly considerably more — according to an analysis by University of San Francisco political science professor Patrick Murphy, who has called for major reform of the measure.

The Economist argued in 2011 that Proposition 13 "ended up centralizing California's finances, shifting them from local to state government." Due to the reduction in revenue generated from property taxes, local governments have become more dependent on sales taxes for general revenue. In response, local governments across California now employ creative strategies to maintain or increase revenue, with many seeking voter approval for special taxes such as parcel taxes for public services that previously were funded entirely or partially from property tax revenues collected before Proposition 13 became law.

Critics also argue that the law contributes to California's housing affordability crisis by creating a strong disincentive for long-time homeowners to sell — commonly called the "lock-in effect." Because selling a home triggers reassessment at current market value for the buyer while eliminating the seller's low base year value, owners who have held properties for decades may face significant financial disincentives to downsize or relocate, even when their housing situation has changed. This dynamic is thought to restrict the supply of homes available for purchase in already-constrained markets like San Francisco.

Proposition 13's supermajority requirement for new taxes was itself challenged in the courts following San Francisco's adoption of Proposition C (2018), a measure to fund homeless services. The First District Court of Appeal ruled that local voters can adopt a tax to fund specific programs by a simple majority rather than a two-thirds supermajority. The California Supreme Court upheld the appellate court's opinion, validating San Francisco's Proposition C, which was adopted in 2018 by more than 60% of the vote to fund homeless programs — a significant clarification of the limits of Proposition 13's supermajority provisions.

Reform Efforts and Current Debate

Attempts to modify or repeal Proposition 13 have consistently met strong public resistance at the ballot box, even in left-leaning areas like San Francisco. Almost 50 years after its passage, Proposition 13 still enjoys broad support: 65% of California adults responding to a 2024 Public Policy Institute of California survey — and 69% of likely voters — said they considered the measure "mostly a good thing."

The most recent major effort to reform the law came in the form of Proposition 15 (2020), a measure that would have lifted Proposition 13's protections on commercial and industrial properties while leaving residential protections intact — a structure commonly referred to as a "split roll." Despite backing from labor unions, progressive advocacy groups, and significant portions of the Bay Area electorate, the initiative failed statewide on a 52% to 48% vote. Regionally, support for commercial property tax reform was highest among likely voters in the San Francisco Bay Area, at 65%, underscoring the geographic divide between coastal urban voters and the broader California electorate on the question of Proposition 13 reform. Despite this relative regional openness to change, statewide majorities have continued to block significant modifications to the law's core provisions.