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If you’re buying a home in San Jose, you’ve probably heard people mention Proposition 13.
It’s one of the most important laws affecting California homeowners because it determines how your property taxes are calculated—and it can save longtime homeowners thousands of dollars every year.
Here’s what you need to know.
What Is Proposition 13?
Proposition 13 was passed by California voters in 1978 to help limit increases in property taxes.
Before then, homeowners could see their property taxes rise dramatically as home values increased. Proposition 13 changed that by creating a system that’s still in place today.
In simple terms, it limits how quickly your property’s assessed value can increase for tax purposes.
How Property Taxes Are Calculated
In California, the base property tax rate is generally 1% of your home’s assessed value, plus any local voter-approved assessments for schools, infrastructure, or community improvements.
The important part isn’t just the tax rate—it’s how your home’s assessed value is determined.
The 2% Rule
Once you purchase a home, Proposition 13 generally limits the increase in your assessed value to no more than 2% per year, even if your home’s market value increases much faster.
For example, your home might double in market value over several years, but your taxable value usually grows much more slowly.
That’s one of the biggest financial benefits of long-term homeownership in California.
When Does Your Home Get Reassessed?
A home’s assessed value doesn’t automatically reset every year.
Instead, a full reassessment usually happens when:
- You purchase a home.
- A property changes ownership.
- Significant new construction or major additions are completed.
If you’ve owned your home for many years, your taxable value could be much lower than the home’s current market value.
Why This Matters in San Jose
This is especially important in San Jose, where home values have increased significantly over the past few decades.
It’s not unusual for two nearly identical homes on the same street to have very different property tax bills.
The homeowner who purchased 20 or 30 years ago may be paying substantially less than someone who just bought the house next door—even if the homes are almost identical.
That’s simply how Proposition 13 works.
What Buyers Should Know
If you’re buying a home today, your property taxes will generally be based on your purchase price, not the amount the current owner is paying.
This surprises many first-time buyers.
The seller’s tax bill may look surprisingly low because they’ve owned the home for many years, but once the property changes ownership, it will typically be reassessed at its current market value.
That’s why it’s important to estimate your future property taxes before making an offer.
Benefits for Longtime Homeowners
For homeowners who have stayed in their homes for many years, Proposition 13 can provide significant long-term savings.
As home values continue to rise, their property taxes generally increase much more gradually, making it easier to stay in the home they’ve owned for decades.
There Are Some Exceptions
California has updated Proposition 13 over the years with additional rules that may benefit certain homeowners.
Depending on your situation, homeowners who are 55 or older, living with certain disabilities, or rebuilding after a natural disaster may be able to transfer their property tax base to another home under specific circumstances.
Because these rules can change, it’s always a good idea to speak with a qualified tax professional or the Santa Clara County Assessor’s Office if you think you may qualify.
Bottom Line
Proposition 13 is one of the biggest financial advantages of owning real estate in California.
It helps keep property tax increases predictable by limiting annual increases in assessed value while generally reassessing a property only when it’s sold or significantly improved.
If you’re buying a home in San Jose, remember that your future property taxes will usually be based on what you pay for the home, not what the current owner is paying.
Understanding how Proposition 13 works before you buy can help you budget more accurately and avoid surprises after closing.
If you’re thinking about buying a home in San Jose, I’d be happy to help you estimate property taxes on any property you’re considering and explain how Proposition 13 may affect your monthly housing costs.
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About the Author – Michelle Elliott
With over 20 years of experience navigating the fast-paced Silicon Valley market, I provide a strategic, results-driven approach to residential real estate. My career is built on a foundation of deep local expertise and a relentless commitment to my clients’ success, resulting in over $235 million in lifetime sales volume and a consistent ranking in the top 3% of agents in Santa Clara County and top 2% at Coldwell Banker. My expertise has been featured on KTVU Fox 2, Real Producers and the Willow Glen Resident. She is also the co-host of the San Jose Podcast “Say What You Want About Real Estate”
A Hyper-Local Expert with Global Reach
I specialize in San Jose, in the neighborhoods of Willow Glen (95125 & 95124) Cambrian Park and Almaden, Downtown San Jose/Japantown (95112) markets. As a certified Luxury Property Specialist with Coldwell Banker Realty, I combine high-end marketing strategies with granular neighborhood knowledge to help my clients achieve premium results.
The “Tiger” at the Negotiating Table
My clients have characterized me as a “tiger” at the negotiating table who remains “sweet and patient” with my clients throughout the process. I pride myself on being a fierce advocate for my buyers and sellers, ensuring the best possible terms in every transaction, and I strive to be the best Realtor in 95125! This balance, drive, and tenacity have earned me consistent 5-star ratings across Google, Zillow, Realtor.com, and Yelp.
Michelle Elliott
Michelle@michelleelliottrealtor.com
1712 Meridian Ave, Ste C, San Jose, CA
DRE 01777533
