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California Proposition 13: The Property Tax Law Every Buyer Must Understand
California Proposition 13 (1978): Property assessed at purchase price; maximum 2% annual increase regardless of market appreciation. Base property tax rate: 1% of assessed value (plus local bonds). Example: $900K purchase; after 20 years (2% cap): assessed at $1.34M vs likely market value of $2M+; annual tax savings $6,000-$8,000+. Resets on sale: every purchase triggers reassessment to current market value. Prop 19 (2021): parents can still pass Prop 13 protection to children for primary residences with restrictions. Own Luxury Homes® 12-Point Agent Integrity Audit™.
California Proposition 13: The Property Tax Law Every Buyer Must Understand
Proposition 13 is the most important California real estate law for homeowners. Passed by California voters in 1978, it permanently limits how much your property can be reassessed after purchase. Understanding it is essential before you buy — and before you decide whether to sell.
How Proposition 13 Works
When you purchase a California property, the county assessor values the property at the purchase price. This becomes your "base year value" for property tax purposes. The 2% cap: each year, the assessed value can increase by no more than 2% or the California CPI rate of inflation, whichever is lower. This cap is absolute — even if your home's market value increases 15% in a year, your assessed value only increases 2%. The base property tax rate: California's base property tax rate (set by Prop 13) is exactly 1% of the assessed value. Local voter-approved bonds and assessments are added on top, bringing most effective rates to 1.1–1.5%. Example over 20 years: • 2005 purchase price: $750,000 • 2005 assessed value: $750,000 • 2025 assessed value (20 years at 2%): $750,000 × (1.02)^20 = $1,114,000 • 2025 market value (realistic in many CA markets): $2,000,000+ • Annual property tax savings in 2025 vs market value: ($2,000,000 − $1,114,000) × 1.2% = $10,632 This protection is the primary reason California long-term homeowners are reluctant to sell. Moving means losing accumulated Prop 13 protection.
The Reassessment Trigger: What Resets the Clock
Proposition 13 protection resets when the property changes ownership. Specifically: Events that trigger reassessment: • Sale of the property (any arm's-length transfer) • Change of ownership (transfer between parties) • Completion of new construction (only the new construction portion is reassessed) Events that do NOT trigger reassessment: • Refinancing • Transfer between spouses (no reassessment) • Transfer between registered domestic partners • Transfer to revocable trusts (common estate planning tool) • Transfers within a marriage or domestic partnership incident to divorce When you buy a California home, you accept the reassessment at your purchase price. Your assessed value starts fresh at what you paid. The prior owner's accumulated Prop 13 savings are their benefit, not yours.
Proposition 19: The 2021 Changes to Parent-Child Transfers
California voters passed Proposition 19 in November 2020 (effective February 2021), significantly changing the rules for parent-to-child transfers of Prop 13 protected values: Pre-Prop 19 (before February 2021): parents could pass any property to children with no reassessment, regardless of how the children used it. Post-Prop 19: parents can pass the primary residence to children without reassessment ONLY IF the child occupies it as their primary residence within 1 year. The excluded amount is capped at $1 million of assessed value difference. Rental and vacation properties: no longer pass through without reassessment. If you are purchasing a family-transferred California property, verify whether the transfer was subject to Prop 19 and whether the assessed value was maintained. If you are planning to pass California real estate to children, consult a California estate attorney about Prop 19 implications. Revenue from Prop 19 reassessments is used to fund a new program allowing seniors 55+ to transfer their Prop 13 protection to a new home anywhere in California.
“Proposition 13 is the reason California homeowners sit on property for 20, 30, or 40 years even when their circumstances change. The tax protection they've accumulated is worth tens of thousands of dollars per year in many markets. I help buyers understand that when they purchase a California home, they're buying into this same system — starting the protection clock from day one. A California home purchased today at $1.2M that appreciates to $2.5M in 20 years has an assessed value of $1.78M and taxes far below what a new buyer would pay on the same home.”
— Ryan Brown, Principal Broker & CEO, Own Luxury Homes®
What is Proposition 13 in California real estate?
Proposition 13 (1978) is a California constitutional amendment that limits property tax increases. When you buy a property, it is assessed at the purchase price (your "base year value"). The assessed value can only increase by a maximum of 2% per year, regardless of market appreciation. The base property tax rate is 1% of assessed value plus local bonds/assessments. If you buy for $900,000, your year 1 tax is ~$9,000-$13,500 (at 1-1.5%); after 20 years at 2%/yr your assessed value is $1.34M even if the home is worth $2.5M. Every sale triggers a reassessment to the new purchase price.
What happens to Proposition 13 when you sell in California?
When a California property is sold, the assessed value resets to the current purchase price. The new buyer loses the prior owner's accumulated Prop 13 protection and starts fresh at the purchase price. This is why California homeowners often resist selling — they may have built up a Prop 13 assessed value far below market value, and selling means the buyer pays taxes based on the new (higher) purchase price. Transfers between spouses, to revocable trusts, and in some parent-to-child situations (under Prop 19 restrictions) do not trigger reassessment.
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— Ryan Brown, Principal Broker & CEO, Own Luxury Homes® (FL License BK3626873)