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Updated 2025 Tax Year

San Joaquin County
Property Tax Guide

Everything you need to know about property taxes in San Joaquin County, CA. Rates, due dates, exemptions, and how it affects your monthly payment.

10 Official Sources
8 min read
Quick Facts
Tax Rate
1.25% to 2.39% of assessed value (1% base + special assessments)
1st Due
Nov 1
2nd Due
Feb 1
Exemptions
5+ Available
Section 1

How Property Tax Works

San Joaquin County property taxes fund essential local services including schools, public safety, infrastructure, libraries, and county operations. The property tax system in San Joaquin County follows California's Proposition 13 framework, which establishes a base tax rate of approximately 1% of assessed value, with additional voter-approved assessments for schools, special districts, and infrastructure improvements.

Property owners in San Joaquin County can expect effective tax rates ranging from 1.25% to 2.39% depending on their specific location and applicable special assessments. The county's agricultural heritage and growing urban areas create diverse tax districts, with some properties subject to additional assessments for flood control, school bonds, and community facilities. Annual assessed value increases are capped at 2% under Proposition 13, providing predictability for long-term property owners.

Section 2

What Makes Up Your Tax Bill

ComponentRateDescription
Base County Rate~1.00%Core county services, schools, basic infrastructure
San Joaquin Delta GOB0.0110%General obligation bonds for delta region improvements
San Joaquin Delta SFID0.0146%Special facilities improvement district assessments
School District Bonds0.15-0.40%Local school district bond measures (varies by district)
City/Municipal Bonds0.05-0.25%City-specific infrastructure and services (varies by city)
Special Districts0.10-0.50%Fire protection, water, parks, community facilities
Total Range1.25-2.39%Combined effective rate depending on location
Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in San Joaquin County, property taxes are due in two installments:

First Installment
Nov 1
Delinquent after Dec 10
Second Installment
Feb 1
Delinquent after Apr 10
Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental taxes are additional property tax bills issued when there's a change in ownership or completion of new construction in San Joaquin County. These taxes represent the difference between the previous assessed value and the new assessed value, prorated for the remaining portion of the fiscal year. Supplemental tax bills are separate from regular property tax bills and have different due dates.

For example, if you purchase a home in San Joaquin County in January that was previously assessed at $250,000 but sells for $400,000, you'll receive a supplemental tax bill. The assessment increases from $250,000 to $400,000, creating a $150,000 difference. At a 1.25% tax rate, this generates an additional $1,875 annually, or $937.50 for the remaining half of the fiscal year (January through June). This supplemental bill is typically due 30 days from the date of mailing.

Example Calculation

$300,000 Home:

  • Assessed Value: $300,000
  • Homeowner's Exemption: -$7,000
  • Net Taxable Value: $293,000
  • Tax Rate: 1.25%
  • Annual Tax: $3,663
  • Monthly Escrow: $305

$600,000 Home:

  • Assessed Value: $600,000
  • Homeowner's Exemption: -$7,000
  • Net Taxable Value: $593,000
  • Tax Rate: 1.25%
  • Annual Tax: $7,413
  • Monthly Escrow: $618

$1,000,000 Home:

  • Assessed Value: $1,000,000
  • Homeowner's Exemption: -$7,000
  • Net Taxable Value: $993,000
  • Tax Rate: 1.25%
  • Annual Tax: $12,413
  • Monthly Escrow: $1,034

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Section 5

Escrow & Property Taxes

Most San Joaquin County homeowners with mortgages have their property taxes collected through escrow accounts managed by their lenders. Your mortgage servicer estimates your annual property tax bill, divides it by 12, and collects this amount with your monthly mortgage payment. The servicer typically maintains a cushion of 2-6 months of tax payments in your escrow account to ensure funds are available when taxes are due.

Property taxes in San Joaquin County are typically due in two installments, and your lender will pay these directly to the county tax collector on your behalf. You should receive an annual escrow analysis showing how your payments were used and any adjustments needed for the coming year. It's important to verify that your lender pays your taxes on time, as you remain ultimately responsible for ensuring payment even when using escrow. You can verify payments through the San Joaquin County tax collector's online portal using your property's Assessor's Parcel Number (APN).

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

Q: When are property taxes due in San Joaquin County? A: Regular property taxes are typically due September 15th, but the deadline can extend to December 1st if assessment notices are mailed after August 1st. Check with the San Joaquin County Tax Collector for specific annual dates.

Q: How do I apply for the Homeowner's Exemption? A: File an application with the San Joaquin County Assessor's Office by February 15th of the tax year. This $7,000 exemption saves approximately $70-80 annually and transfers automatically to new properties if you move within the county.

Q: Can I pay my property taxes online? A: Yes, San Joaquin County offers online payments through their website using credit card, debit card, or E-Check. Monthly payment plans are also available through their third-party vendor, Easy Smart Pay.

Q: How do I appeal my property assessment? A: File an appeal with the County Assessment Appeals Board during the regular filing period, which typically runs from July 2nd through September 16th or December 2nd, depending on when notices are mailed.

Q: What happens if I pay my taxes late? A: Late payments incur penalties and interest charges. The penalty is typically 10% of the unpaid tax amount, plus additional penalties and interest for extended delinquency.

Q: How is my property's assessed value determined? A: Under Proposition 13, your assessed value is either your purchase price (for new owners) or your previous year's assessed value plus up to 2% (for existing owners). The county assessor may also consider new construction or changes to the property.

Q: Do I still get Proposition 13 protection if I inherit property? A: Under Proposition 19 (2020), inherited property retains its assessed value only if it's the parent's primary residence and the assessed value plus $1 million doesn't exceed the current market value when you inherit it.

Q: What if my property value has declined? A: You may be eligible for a Proposition 8 reduction, which temporarily lowers your assessed value to current market value if it's below your Proposition 13 value. File an application with the county assessor.

Q: Are there exemptions for veterans or seniors? A: California offers a disabled veterans' exemption for qualifying veterans. Seniors may be eligible for postponement programs or transferability of their assessed value under certain circumstances.

Q: How can I find my property's tax history? A: Use the San Joaquin County Tax Collector's online portal with your Assessor's Parcel Number (APN) to view current and historical tax information, payment history, and outstanding balances.

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