Property tax in Santa Clara County is calculated at 1% of your property’s assessed value, plus voter-approved bonds and special assessments that push the effective rate slightly higher. Bills are mailed by November 1 and paid in two installments: the first is delinquent after December 10, and the second is delinquent after April 10. What you actually owe depends on how the Assessor sets your assessed value, which exemptions you claim, and whether you pay on time.
How Your Assessed Value Is Set
The Santa Clara County Assessor’s Office determines the assessed value your bill is calculated from. The Assessor does not set the tax rate or produce the bill itself. The office appraises the property using purchase price data, comparable sales, and other market factors, then places the value on the assessment roll.1Office of the Assessor, Santa Clara County. Assessment Information for the Santa Clara County Property Owner
California’s Proposition 13 controls the rest. When you buy a property or complete new construction, the Assessor establishes a base year value equal to the market value at that time. After that, the assessed value can rise by no more than 2% per year or the change in the California Consumer Price Index, whichever is lower.1Office of the Assessor, Santa Clara County. Assessment Information for the Santa Clara County Property Owner A home purchased 15 years ago is almost certainly assessed well below current market price, and the tax bill reflects that lower figure.
When Market Values Drop
If your property’s current market value falls below its Proposition 13 factored base year value, the Assessor should review the assessment and enroll the lower figure. This temporary reduction, authorized by Proposition 8, stays in place only as long as the market value remains below the adjusted base year value. Once the market recovers, the assessed value returns to where it would have been under the normal 2% adjustment.2California State Board of Equalization. Decline in Value – Proposition 8 If you believe your value has dropped and the Assessor hasn’t adjusted it, you can file a decline-in-value application.
The Rate: 1% Plus Local Add-Ons
Proposition 13 caps the base rate at 1% of net assessed value.3Santa Clara County Assessor’s Office. Assessment Information for the Santa Clara County Property Owner Your actual rate is higher because voter-approved general obligation bonds and special assessments fund schools, water infrastructure, transit, and other local projects. They show up as separate line items on your bill.4Department of Tax and Collections. Frequently Asked Questions for Property Taxes The exact total varies by tax rate area, meaning your city, school district, and special districts.
Supplemental Bills After Buying or Building
When you buy a home or finish construction, you will likely receive one or two supplemental tax bills on top of your regular annual bill. The supplemental assessment reflects the difference between the old assessed value and the new one, prorated for the remaining months in the fiscal year.5California State Board of Equalization. Supplemental Assessment
Close on a home in October, and the supplemental bill covers nine months, November through June. The Assessor multiplies the net change in value by the tax rate and applies a 0.75 proration factor for those nine months. If the new assessed value is higher, you owe the difference; if lower, you get a refund.5California State Board of Equalization. Supplemental Assessment New buyers are routinely caught off guard when these bills arrive months after closing, so plan for them.
Payment Schedule and Due Dates
The property tax year runs July 1 through June 30. Tax liability attaches as a lien on your property at 12:01 a.m. on January 1, the lien date.6California State Board of Equalization. Property Tax Calendar Annual secured bills go out no later than November 1.4Department of Tax and Collections. Frequently Asked Questions for Property Taxes
Payment comes in two installments:
- First installment: due November 1, delinquent after December 10 at 5:00 p.m.
- Second installment: due February 1, delinquent after April 10 at 5:00 p.m.
If a delinquency date falls on a weekend or legal holiday, the deadline extends to the close of business on the next business day.6California State Board of Equalization. Property Tax Calendar You can also pay both installments together when the fall bill arrives.
How to Pay
The Department of Tax and Collections offers three payment channels. Online, the county portal accepts credit cards, debit cards, and electronic checks. Card transactions carry a convenience fee of 2.22% (minimum $1.49).7Department of Tax and Collections. Make Payments Online E-checks are free.8Department of Tax and Collections. Property Tax Payment Instructions On a $10,000 bill, the card fee runs about $222, so the e-check is worth using.
You can also mail a check or money order with your payment stub. Include your Assessor’s Parcel Number. The postmark date controls whether your payment is timely: as long as the U.S. Postal Service cancellation stamp is on or before the delinquency date, the payment counts as on time.8Department of Tax and Collections. Property Tax Payment Instructions Private postage meters and non-USPS carriers do not satisfy this rule, which trips people up more often than you would expect. In-person payments are accepted at the Department of Tax and Collections during business hours.
Penalties for Late Payment
Miss December 10 or April 10 and penalties start immediately. Each delinquent installment picks up a 10% penalty on the unpaid amount plus a $20 cost.4Department of Tax and Collections. Frequently Asked Questions for Property Taxes On a $5,000 installment, that is $520 in penalties and costs you could have avoided.
If any taxes remain unpaid at 5:00 p.m. on June 30, the property enters tax-defaulted status. A $30 redemption fee is added, and the unpaid balance begins accruing an additional 1.5% per month, or 18% annually.4Department of Tax and Collections. Frequently Asked Questions for Property Taxes Those monthly penalties compound quickly.
Property that stays in tax-defaulted status for five or more years becomes subject to the county’s power to sell it to recover the unpaid taxes.9California State Controller’s Office. Notice of Impending Power to Sell Tax-Defaulted Property A tax sale is the last step, but it does happen. The county mails notices of the impending sale well in advance, giving you time to redeem the property by paying all back taxes, penalties, and fees.
What Unpaid Taxes Mean for Your Mortgage
Property tax liens are legally superior to mortgage liens, so the county’s claim comes first. Because of that priority, most mortgage agreements include an acceleration clause letting the lender demand full repayment if you fail to pay property taxes. In practice, lenders often pay the overdue taxes themselves, add the amount to your loan balance, and require you to set up an escrow account going forward.
Exemptions and Relief That Can Lower Your Bill
Homeowners’ Exemption
The California Homeowners’ Exemption reduces your assessed value by $7,000, which saves roughly $70 a year at the 1% base rate.10California State Board of Equalization. Property Tax Savings – Homeowners Exemption You must occupy the property as your principal residence on the January 1 lien date. File form BOE-266 once with the County Assessor, and the exemption stays in place until you sell or move out.11California State Board of Equalization. Homeowners Exemption Small money, but no reason to leave it unclaimed.
Disabled Veterans’ Exemption
Veterans rated 100% disabled from a service-connected condition, or compensated at the 100% rate for unemployability, qualify for a much larger exemption on their principal residence. An unmarried surviving spouse may also claim it. There are two tiers:12California State Board of Equalization. Disabled Veterans Exemption
- Basic exemption: $180,671 reduction in assessed value for 2026.
- Low-income exemption: $271,009 reduction for households below the annual income limit.
Both amounts adjust annually for inflation.13California State Board of Equalization. Disabled Veterans Exemption Increases for 2026 The Disabled Veterans’ Exemption replaces the Homeowners’ Exemption; you claim one, not both.
Property Tax Postponement
California’s Property Tax Postponement program lets eligible homeowners delay paying property taxes, with the state placing a lien on the home. Deferred taxes accrue interest, and the balance comes due when you sell, move, or pass away. To qualify, you must:14California State Controller’s Office. Property Tax Postponement Fact Sheet
- Be at least 62, blind, or disabled
- Own and occupy the home as your principal residence
- Have total household income of $55,181 or less
- Hold at least 40% equity in the property
- Have no reverse mortgage on the property
You must reapply each year you want to postpone payment.
Proposition 19 Base Year Value Transfers
If you are 55 or older, or severely and permanently disabled at any age, Proposition 19 lets you transfer your current property’s low Proposition 13 assessed value to a replacement home anywhere in California, up to three times.15California State Board of Equalization. Proposition 19 Fact Sheet The benefit is meaningful in Santa Clara County, where long-time homeowners often have assessed values hundreds of thousands of dollars below market. Without Prop 19, selling and buying elsewhere would reset your assessed value to the new purchase price and drive up your tax bill. If the replacement home costs more than the original, the difference is added to your transferred base year value.
Escrow Accounts and Property Taxes
If your mortgage has an escrow (or impound) account, your lender collects a share of the estimated annual property taxes with each monthly payment and pays the county for you. Federal rules under the Real Estate Settlement Procedures Act cap the cushion your servicer can require at one-sixth of the estimated annual escrow disbursements.16eCFR. 12 CFR 1024.17 – Escrow Accounts Your servicer must make the tax payment on time as long as your mortgage payment is not more than 30 days overdue. If the servicer pays late and the county imposes penalties, the servicer covers those costs, not you.
Even with escrow, verify each year that your taxes were actually paid. The county’s online portal lets you look up your parcel and confirm payment status. Servicer errors are uncommon, but when they happen, the delinquency notice comes to you.
Deducting Property Taxes on Your Federal Return
You can deduct Santa Clara County property taxes on your federal return only if you itemize on Schedule A. Given local home values, many owners find itemizing worthwhile.
The State and Local Tax (SALT) deduction, which covers property taxes plus either state income taxes or state sales taxes, is capped at $40,400 for the 2026 tax year for most filers ($20,200 for married filing separately). The cap begins phasing down once your modified adjusted gross income exceeds $505,000 ($252,500 for married filing separately), with the deduction reduced by 30% of the amount your income exceeds that threshold. Where property taxes alone can reach five figures and California state income tax is steep, higher-income homeowners often hit the cap well before deducting their full tax burden.