If you’re buying in Santa Clara County and trying to estimate your property tax bill, don’t use the seller’s current bill as your guide. Once you buy, your assessed value generally resets to your purchase price, so your bill will likely look very different from theirs.
Santa Clara County property tax is built in three layers. It starts with the 1% base levy set by Proposition 13. Next come voter-approved debt rates, which vary depending on where the property sits. Last are flat charges that don’t change with the home’s value at all. Across the county’s tax rate areas, the value-based portion typically lands between about 1.12% and 1.24%.
Below, we’ll walk you through how the rate is built, how the bill comes together, what happens to your assessment when you buy, when payments are due, and how Propositions 13, 8, and 19 can affect what you owe.
Key Takeaways
- Proposition 13 sets the maximum levy at 1.00000 per $100 of assessed value, and total tax rates in Santa Clara County generally range from about 1.12% to 1.24% once voter-approved debt is added.
- A San Jose Unified address starts at 1.14940 per $100 of assessed value, which is the base levy plus the 0.03880 countywide retirement levy plus 0.11060 in district bonds.
- Changes in ownership added $16.1 billion to the county’s 2025-26 assessment roll, 56% of the total growth, because a sale resets assessed value to the purchase price.
- Santa Clara County property taxes are due in two installments, November 1 and February 1, and become delinquent after December 10 and April 10.
- Proposition 19 lets homeowners 55 or older, severely disabled homeowners, and disaster victims move their existing assessed value to a replacement home up to three times.
Where These Figures Come From
Every rate and roll figure below traces to one of three primary sources. Here is which one, and when each refreshes.
| Figure | Source | Refreshes |
|---|---|---|
| The 1% levy, the retirement levy, district bond rates, and tax rate area totals | County of Santa Clara Controller-Treasurer, Compilation of Tax Rates, FY 2025-26 | Each fiscal year |
| Assessment roll totals, growth, and Proposition 8 decline counts | Office of the Assessor, 2025-26 roll, lien date January 1, 2025 | At roll close each summer |
| Proposition 13, 8, and 19 rules, thresholds, and the parent-child cap | California State Board of Equalization | On statute change; the parent-child cap adjusts biennially |
Your tax bill depends on your assessed value, not on your financing, so no purchase price, payment, or mortgage rate is needed to compute it. Flat charges stay outside every percentage quoted here, because they do not scale with value, and folding them into a single rate would misstate what a lower-priced property actually pays.
What Is the Santa Clara County Property Tax Rate?
There is no single rate; a fixed base applies everywhere, and a variable component depends on the property’s tax rate area – which is a geographic zone defined by which taxing agencies overlap there.
The county’s Compilation of Tax Rates for 2025-26 sets the base at 1.00000 per $100 of valuation for all taxing agencies. Everything above that is voter-approved debt service.
| Component | 2025-26 rate | Applies where |
|---|---|---|
| 1% maximum levy | 1.00000 | Every parcel in California |
| County retirement levy | 0.03880 | Every tax rate area in Santa Clara County |
| Voter-approved debt | Varies by tax rate area | Wherever school, community college, city, or special district bonds have passed |
The first two apply to every parcel in the county and come to 1.03880 together. The third is what makes one address differ from another.
For a property inside San Jose Unified School District territory, the district’s outstanding bonds carry rates of 0.03500 for the 2002 bond, 0.01560 for the 2012 bond, and 0.06000 for the 2024 bond. Add those 0.11060 to the base and the retirement levy and a San Jose Unified address starts at 1.14940, before any community college, city, or special district debt.
Total rates across the county’s tax rate areas are generally between roughly 1.12% and 1.24%. To get the exact figure for a property, find the tax rate area number on the bill and look it up in the rate book. Our San Jose property tax guide gives the city-level view for a San Jose address.
How Your Santa Clara County Property Tax Bill Is Assembled
A bill combines two kinds of charges that behave completely differently.
- Ad valorem charges are a percentage of assessed value. The 1% levy and every voter-approved bond rate belong here. Double the assessed value and you double these charges.
- Fixed charges and special assessments are flat dollar amounts per parcel. School parcel taxes, some city services, sanitation, and vector control belong here. A condo and a house several times its price in the same district pay the same flat amount.
That split has a consequence worth knowing before you compare two bills. Two San Jose homes at similar prices can carry different bills because they are in different tax rate areas, and two homes in the same tax rate area at very different prices carry identical flat charges. The all-in effective rate on a lower-priced property is therefore higher than on an expensive one, because the flat portion is a larger share of a smaller bill.
How Your Assessment Changes When You Buy
Your assessed value resets to your purchase price, and that single mechanic drives most of what a new owner experiences.
The scale of it shows up in the county’s own numbers. For the 2025-26 assessment roll, the Santa Clara County Assessor reported total assessed value of $725.7 billion, up $28.9 billion or 4.15% from the prior year. Changes in ownership accounted for $16.1 billion of that growth, or 56%. The Proposition 13 inflation factor added $14.4 billion and new construction added $3.8 billion.
Sales are the largest single source of assessment growth in this county, larger than the inflation factor and new construction combined. That is a direct measure of how far long-time owners’ assessed values sit below what new buyers pay.
So the tax figure on a listing is the seller’s, set by the seller’s purchase price, possibly decades ago. Build your own figure from your own purchase price.
Supplemental Tax Bill
A second bill follows the first one. When ownership changes, the assessor issues a supplemental assessment covering the difference between the old assessed value and the new one, prorated for the remaining months of the fiscal year. It arrives separately, often months after closing, and it is usually not paid out of your impound account.
A supplemental bill does not mean something went wrong. It means the reassessment caught up to your purchase, and it is a one-time charge before the regular bill reflects your value.
When Is Santa Clara Property Tax Due?
Secured property taxes are billed once and paid in two installments.
| Installment | Due | Delinquent after | Late penalty |
|---|---|---|---|
| First | November 1 | December 10 | 10% of the installment |
| Second | February 1 | April 10 | 10% plus a cost charge |
If the delinquency date falls on a weekend or holiday, it moves to the next business day. Confirm current dates and the second-installment cost charge with the Santa Clara County Department of Tax and Collections before relying on them.
If your loan has an impound account, your servicer pays these for you, and it is worth confirming the payment posted.
Proposition 13, Proposition 8, and the Exemptions That Lower Your Bill
Proposition 13 sets the base rate at 1% and caps annual increases in assessed value at 2%, tied to the inflation rate. The cap resets on a change of ownership or new construction. That 2% ceiling is why a neighbor who bought in 1998 pays a fraction of what a 2026 buyer pays on an identical house.
Proposition 8 works the other direction. When market value falls below the assessed value carried under Proposition 13, the assessor can temporarily reduce the assessment to market value. For 2025-26, 8,699 Santa Clara County properties were in decline status, down 2,527 from 11,226 the prior year. A Proposition 8 reduction is temporary and reverses as values recover.
The Homeowners’ Exemption reduces the assessed value of an owner-occupied primary residence by $7,000. At Santa Clara County rates that saves between $78 and $87 a year depending on the tax rate area, so roughly $80. The saving is small, and the exemption has to be filed with the assessor rather than applied automatically when you buy.
Proposition 19 and Moving Without Losing Your Assessed Value
For a long-time Santa Clara County owner with a low Proposition 13 base, this provision is often worth more than the price difference between two homes.
Under Proposition 19, effective April 1, 2021, a homeowner who is 55 or older, severely and permanently disabled, or a victim of a wildfire or a governor-declared disaster can transfer the assessed value of their existing primary residence to a replacement primary residence anywhere in California. The transfer is available up to three times.
The replacement home does not have to cost less. If it costs more, the excess is added to the transferred value rather than triggering a full reassessment. The equal-or-lesser thresholds are 100% if you buy before selling, 105% if you buy within the first year after the sale, and 110% if you buy within the second year.
Parent-to-child and grandparent-to-grandchild transfers changed on February 16, 2021. The exclusion now applies only to a principal residence or a family farm, the transferee must occupy the property as a principal residence and file for the Homeowners’ Exemption within one year, and the excluded amount is capped at the factored base year value plus $1,000,000 as biennially adjusted. For transfers between February 16, 2025 and February 15, 2027, that adjusted figure is $1,044,586.
How the Tax Bill Affects Your Mortgage
Property taxes are part of your housing payment for qualifying purposes, so the tax figure changes how much you can borrow.
A lender totals principal, interest, taxes, insurance, and any HOA dues, then measures that against your gross monthly income to get a debt-to-income ratio. A higher tax bill leaves less room for principal and interest at the same income.
Three consequences follow for a buyer:
- Use your purchase price rather than the seller’s bill. A pre-approval built on the seller’s tax figure overstates what you can afford, and the correction usually arrives at underwriting.
- Budget for the supplemental bill separately. It typically arrives outside the impound account, so plan to pay it directly.
- A higher rate on a workable structure is not automatically the wrong answer. If a temporary buydown or seller-paid points produce a monthly payment you can carry alongside the real tax figure, that is a good outcome.
Our cost of living guide puts property tax next to the other carrying costs, and our high schools guide covers the district boundaries that decide which school bonds appear on your bill.
What This Means for Different Buyers
If you’re buying your first Santa Clara County home.
Compute the tax figure from your offer price at 1.1494% for a San Jose Unified address, or up to about 1.24% elsewhere in the county, then confirm the tax rate area rate once you have an address. Set aside money for the supplemental bill.
If you’re moving within California and you’re 55 or older.
Check Proposition 19 before you list. Transferring a low base year value can be worth more than the price difference between two homes, and the timing rules around the sale determine which threshold applies.
If you’re buying a condo or a lower-priced property.
Flat special assessments make up a larger share of your bill, so the all-in effective rate is higher than a percentage-of-value estimate suggests. Pull the actual prior-year bill for the specific parcel. Our condo buying guide covers what changes when the property is a condo.
If you’re inheriting a Santa Clara County home.
The parent-child exclusion now requires you to occupy the property as a principal residence and file within one year, and it caps at the factored base year value plus $1,044,586 for transfers through February 15, 2027. A home held for decades can exceed that cap easily.
How We Handle the Tax Figure on a Santa Clara County Purchase
We build the tax figure from your purchase price at the area tax rate, rather than from the seller’s bill or a national default percentage. National defaults run well below what this county charges, and the gap shows up at underwriting instead of at pre-approval.
We flag the supplemental assessment before closing, so the first bill after you move in is one you planned for. We also tell you whether the property is in a district with recent bond measures, because that changes the ad valorem portion and changes what you qualify for.
Then we set up the impound account against the correct annual figure, which reduces the chance of an escrow shortage at the first annual analysis. Our neighborhood and median price guides cover where local prices vary across the city and where local prices sit against the loan limits.
View mortgage rates for
October 19, 2026
Frequently Asked Questions
What is the property tax rate in Santa Clara County?
Santa Clara County property tax starts with the 1% maximum levy set by Proposition 13, fixed at 1.00000 per $100 of assessed value, plus a countywide retirement levy of 0.03880 and voter-approved debt rates that vary by tax rate area. Total Santa Clara County property tax rates are generally between about 1.12% and 1.24%, and a San Jose Unified address starts at 1.14940. Flat special assessments are added separately and do not scale with value.
How are Santa Clara County property taxes calculated?
Santa Clara County calculates property taxes by multiplying the assessed value by the total ad valorem rate for its tax rate area, then adding any flat special assessments. Assessed value is set at the purchase price when a property changes ownership and rises no more than 2% a year afterward under Proposition 13.
When is Santa Clara property tax due?
Secured property taxes in Santa Clara County are due in two installments. The first is due November 1 and becomes delinquent after December 10. The second is due February 1 and becomes delinquent after April 10. A late first installment carries a 10% penalty, and a late second installment carries 10% plus a cost charge.
Why is my Santa Clara County property tax bill higher than the seller’s was?
Assessed value resets to the purchase price when a property changes ownership, so a new owner’s bill reflects today’s price rather than what the seller paid. Proposition 13 caps annual increases at 2%, so a long-held property can carry an assessed value far below market. Changes in ownership added $16.1 billion to the county’s 2025-26 assessment roll for this reason, 56% of the roll’s total growth.
What is a supplemental property tax bill in Santa Clara County?
A supplemental property tax bill covers the difference between the prior assessed value and the new one after a change of ownership or new construction, prorated for the remaining months of the fiscal year. The supplemental bill arrives separately from the regular bill, often several months after closing, and it is usually not paid from an impound account.
Can I transfer my property tax base to a new home in California?
Yes, under Proposition 19, if you are 55 or older, severely and permanently disabled, or a victim of a wildfire or governor-declared disaster. The transfer applies to a replacement primary residence anywhere in California and can be used up to three times. If the replacement home costs more, the excess is added to the transferred base year value rather than triggering a full reassessment.
What is the Homeowners’ Exemption in Santa Clara County?
The Homeowners’ Exemption reduces the assessed value of an owner-occupied primary residence by $7,000, which saves between $78 and $87 a year depending on the tax rate area. The exemption has to be filed with the Santa Clara County Assessor and is not applied automatically when you buy.
Ready to Build the Real Tax Figure Into Your Budget?
Your Santa Clara County property tax bill will be built from your purchase price, not the seller’s, and a San Jose Unified address starts at 1.1494% of that price before flat charges. Getting that number right at pre-approval is what keeps your homebuying budget on track.
Contact JVM Lending for a fully underwritten pre-approval, or get started with our San Jose mortgage lender page.
JVM Lending is not a tax professional or an attorney. Proposition 19 and the parent-child exclusion have filing deadlines and conditions specific to your situation, so consult a qualified professional before relying on them, and we’re happy to refer you to one.
Sources
- County of Santa Clara Controller-Treasurer Department, Compilation of Tax Rates and Assessed Valuations, FY 2025-26.
- Office of the Assessor, County of Santa Clara, 2025-26 assessment roll, lien date January 1, 2025.
- Santa Clara County Department of Tax and Collections.
- California State Board of Equalization and the Santa Clara County Assessor.
