San Joaquin Treasurer-Tax Collector: Pay Tax Bill & Hours

Q: What is the San Joaquin County Treasurer-Tax Collector phone number?

The Treasurer-Tax Collector office phone number is 209-468-2133. The county also lists 866-628-9244 for technical online-payment assistance and 877-777-3839 for phone payments.

Q: What are the San Joaquin County online property tax payment fees?

The county lists e-check at no cost, debit card at 3.49 dollars per transaction, and credit card at 2.29 percent of the amount paid with a 1.35 dollar minimum. The service fees are charged by the payment processor rather than San Joaquin County.

Q: What happens if San Joaquin County property taxes become delinquent?

A late first installment receives a 10 percent penalty. A late second installment receives a 10 percent penalty plus a 10 dollar cost. If secured taxes remain unpaid after June 30, the property becomes tax defaulted and additional fees and 1.5 percent monthly redemption penalties can accrue.

San Joaquin County, California · Property tax action guide

Find, Pay or Fix a San Joaquin County Tax Bill

Use this guide to search the correct assessment, compare payment fees, check Stockton office hours, understand secured and unsecured deadlines, and decide whether your issue belongs to the Tax Collector or the Assessor.

The official portal is best for the live balance. The sections below explain what to verify first so you do not pay the wrong bill, miss a deadline or contact the wrong county office.

Search or pay the official tax bill Call 209-468-2133 Find assessment records

Fee-parcel warning: The county says a fee-parcel search can display unsecured tax bills that may belong to someone other than the current real-property owner. Verify the assessment and bill before paying; if the responsible assessee is unclear, call 209-468-2133.

Office phone

209-468-2133

Stockton office

44 N. San Joaquin St., Suite 150.

Office hours

8:30 a.m.–4:30 p.m. weekdays.

Free online option

E-check: no processor fee listed.

2026 unsecured date

Pay by Aug. 31 to avoid penalty.

Current 2026 help

Dates that matter right now

August 31, 2026

Current unsecured taxes are delinquent after this date if unpaid.

September 15, 2026

San Joaquin County’s informal annual-assessment value-review filing period ends.

November 30, 2026

Last day in the county’s listed formal annual assessment-appeal filing period.

Different task, different office: Payment deadlines belong to the Treasurer-Tax Collector. Value review and assessment appeals involve the Assessor and/or Assessment Appeals process.

Official payment workflow

How to search and pay San Joaquin property taxes online

Open the county-authorized portal Use the San Joaquin County MBC payment search rather than a third-party directory or an advertisement.

Select the current roll year The portal warns that historical roll-year data is not current payment information. Use the current year when you need a live payment status.

Choose Assessment or Fee Parcel An assessment-number search is best for a specific assessment. A fee-parcel search can summarize current or delinquent fiscal-year assessments connected with the parcel.

Enter the number from the tax bill The assessment number and fee parcel number appear in the upper-left property-information area of the county tax bill.

Verify every result Match the roll year, assessment, fee parcel, bill type and amount. A fee-parcel result may include an unsecured bill for another assessee.

Choose e-check, debit or credit E-check is listed at no cost. Debit is $3.49 per transaction. Credit is 2.29% with a $1.35 minimum.

Save the transaction proof Keep the confirmation number, payment date and bank/card record. A transaction number does not prove settlement if an e-check later fails.

Open the official tax search Technical payment help: 866-628-9244

Portal troubleshooting

No bill found or the wrong record appears?

Assessment search misses other balances Use Fee Parcel when you need a broader summary of assessments connected with the parcel.

Street-address search is difficult The portal says deed addresses may use abbreviations. Remove Street, Road, Drive or Lane and shorten directions to N, E, S or W.

Fee parcel shows an unfamiliar unsecured bill Do not assume it belongs to the property owner. Call or email the Tax Collector to identify the assessee.

You need prior-year phone payment The county says prior-year taxes are not available by phone. Use the online search or contact the office.

You need lien or demand information Email tax@sjgov.org, call the office or use the listed demand fax at 209-468-9482.

The website or phone system is unavailable Do not wait past a delinquent deadline; the county says system availability does not remove statutory penalties.

Useful call script “I am checking San Joaquin County assessment [number] / fee parcel [number] for roll year [year]. I need to confirm [the responsible assessee / current balance / payment posting / prior-year amount].”

Payment costs

Compare e-check, debit card and credit card fees

Published San Joaquin County payment-processor fees
Method	Published fee	Best use	Important caution
E-check	No cost	Lowest-cost online or phone option	Bank details and ACH authorization must be correct.
Debit card	$3.49 per transaction	Fixed-fee card payment	Processor fee is separate from tax.
Credit card	2.29%	Card convenience	Minimum charge is $1.35 and cost rises with the bill.
Check / money order by mail	No online processor fee	Taxpayer can meet the mailing deadline	A valid timely USPS postmark matters.

Large e-check? The county lists a $500,000 limit for an individual e-check transaction.

ACH Debit block: Before an e-check, the county tells taxpayers with an ACH block to authorize company IDs 4596379846, 1043575881 and 1621365614 with their financial institution. A rejected payment after the deadline can trigger penalties.

Four payment routes

Pay by phone, mail, drop box or in person

Pay by phone

Call 877-777-3839. You need the 12-digit assessment number from the tax bill.

Current-year inquiry/payment is available by phone; prior-year taxes are not.

Pay by mail

SJC TTC
P.O. Box 2169
Stockton, CA 95201-2169

Make the check or money order payable to SJC TTC, include the payment stub and write the assessment number on the payment.

Pay in person

44 N. San Joaquin Street
First Floor, Suite 150
Stockton, CA 95202

Weekdays 8:30 a.m.–4:30 p.m., excluding holidays; open until 5:00 p.m. on delinquent dates.

After-hours drop box: The county displays a tax-payment drop box outside the downtown Stockton office. Never place cash or card information in an unattended payment box; use a check or money order with identifying bill information.

Before mailing or paying close to a deadline, review the official payment page because processor rules and service fees can change.

Review official payment instructions

Stockton CA office

Office address, official photo and visit tips

Treasurer-Tax Collector

Phonxay Keokham, CPA

44 North San Joaquin Street
First Floor, Suite 150
Stockton, CA 95202

Phone: 209-468-2133
Email: tax@sjgov.org
Fax: 209-468-2158

Searching for photos or reviews? Third-party review pages can group several county departments at the same 44 N. San Joaquin Street building. Use the suite number, official county photo and department phone—not a star rating—to confirm you are visiting the Tax Collector.

Secured property tax

Annual secured tax due dates and penalties

November 1 — first installment due The county mails secured annual bills on or before November 1.

December 10 — first installment delinquent after 5:00 p.m. A 10% delinquent penalty applies when a timely payment or qualifying postmark is missing.

February 1 — second installment due The second installment may be paid separately after the first installment has been paid.

April 10 — second installment delinquent after 5:00 p.m. A 10% penalty plus a $10 cost is added to the unpaid second installment.

June 30 — unpaid secured tax becomes tax defaulted Additional fees, costs and redemption penalties begin after default.

Weekend/holiday protection: When a statutory delinquency date falls on a weekend or legal holiday, the county says the delinquency date moves to the next business day.

Mailing trap

A postage date is not always a valid tax-payment postmark

San Joaquin County says a mailed property-tax payment must be received or carry a timely USPS postmark by the delinquency date. The county specifically warns that some common postage methods are not USPS postmarks.

Mailing methods and deadline risk
Mail marking	County guidance	Safer action near a deadline
Standard USPS stamp	May receive a USPS processing postmark.	Present it at the USPS counter and request a hand-stamped postmark.
Commercial postage meter	Not treated as the controlling USPS postmark.	Do not rely on the printed meter date.
Pre-canceled / private-vendor postage	May not receive a USPS postmark.	Use the USPS counter or pay online early.
Automated Postal Center stamp	County warns this may not be a qualifying USPS postmark.	Obtain a counter postmark or PVI label.
Permit imprint / bank bill-pay mail	May not carry a USPS postmark.	Schedule well before the delinquency date.

Read the county postmark guide

New homeowners

Escrow credit does not always mean the tax bill was paid

Read the closing statement Annual taxes may have been prorated between buyer and seller without the installment actually being sent to the Tax Collector at closing.

Check the outstanding tax bill If it is unclear whether escrow paid an installment, contact the title company and Tax Collector.

Do not wait for a paper bill The annual bill may still be mailed to the previous owner depending on when the ownership change reaches the tax roll.

Watch the mortgage servicer timing A mortgage statement may show taxes as paid before the servicer actually delivers the installment to the county near the delinquent date.

Expect possible supplemental bills A purchase or completed new construction can trigger reassessment and one or more supplemental bills in addition to the annual tax bill.

Penalty rule: The county states that failure to receive a tax bill is not a legal basis to excuse a late-payment penalty.

Read the official new-homeowner guidance

Supplemental bills

Why a second property tax bill can arrive after a purchase or remodel

California supplemental assessments generally follow a change in ownership or completed new construction. The Assessor determines the new value, the Auditor prorates the taxable difference for the remaining fiscal-year period, and the Tax Collector bills the resulting tax.

It is separate from the annual bill

A supplemental bill does not replace the normal secured annual tax bill. More than one supplemental bill can be generated when the reassessment crosses fiscal-year periods.

Your lender may never receive it

The county says supplemental bills are sent to the property owner, not lending agencies. Contact the lender specifically if you expect an escrow or impound account to pay it.

Supplemental deadline: The bill is due when mailed. The first delinquency date is generally the last day of the month following the month the bill was mailed; two-installment bills have a later second-installment delinquency date shown on the bill.

Do not ignore a supplemental bill after selling. The county explains that a later property transfer does not automatically eliminate liability for a supplemental assessment tied to the period when you owned the property.

Review official supplemental-tax rules

Assessor and records

Property tax collector vs Assessor: use the right record system

Where to send common San Joaquin property-tax questions
Your question	Correct office	What to use
How much tax do I owe?	Treasurer-Tax Collector	Tax bill/payment portal.
Did my payment post?	Treasurer-Tax Collector	Payment status or office confirmation.
Why is there a penalty or default?	Treasurer-Tax Collector	Collection/redemption section.
What is the assessed value?	Assessor	Assessed-value lookup.
I need property assessment records.	Assessor	Search by address, Assessment # or Fee Parcel #.
My tax-mailing address is wrong.	Assessor	Mailing-address change process.
I disagree with my value.	Assessor / Appeals	Informal review or formal assessment appeal.

Office of the Assessor

44 N. San Joaquin Street
Second Floor, Suite 230
Stockton, CA 95202

Assessor contact

Phone: 209-468-2630
Hours: 8:30 a.m.–4:30 p.m. weekdays, except holidays.

Search assessed values and property records Open Assessor property information

2026 unsecured tax

Business equipment, boats, aircraft and other unsecured bills

Unsecured taxes are personal liabilities rather than liens on the real estate. Common examples include business equipment, boats, aircraft, improvements on another person’s real estate and some possessory interests.

2026 deadline

Annual unsecured bills are mailed on or before August 1 and are delinquent after August 31 if unpaid. The person or entity owning or controlling the taxable property on the January 1 lien date is generally responsible.

Parcel-search trap

An unsecured bill can appear beside a fee parcel even when it belongs to a former owner or another assessee. Confirm liability before paying it.

Unsecured delinquency progression described by the county
When unpaid	Possible addition	Practical action
After Aug. 31	10% late penalty	Pay promptly or call for exact balance.
After Sept. 30	County FAQ describes an additional $25 fee	Resolve before more collection costs accrue.
After Oct. 31	1.5% monthly penalties plus listed additional fee	Request an updated payoff.
After Nov. 30	Additional collection fee and personal lien action	Contact Tax Collection immediately.

Review official unsecured-tax rules

Defaulted property tax

What happens after June 30 and how a redemption plan works

When secured taxes remain unpaid after June 30, the property becomes tax defaulted. The county says a $15 state redemption fee is added and redemption penalties accrue at 1.5% per month on the unpaid base taxes.

Five-year risk: If taxes remain unpaid for five years after default, the property becomes subject to the Treasurer-Tax Collector’s power of sale and may be sold at public auction.

Five-year redemption installment plan

Ask for the current redemption amount Do not estimate interest yourself. Call the Tax Collector and ask for the redemption section.

Make at least a 20% initial payment The county says the plan begins with at least 20% of the redemption amount plus the required current-year taxes.

Keep current taxes separate The annual current-year tax bill is not included in the redemption installment plan and must be paid separately.

Pay at least 20% plus interest each plan year The county requires the annual plan payment by April 10, along with current taxes and applicable supplemental taxes.

Avoid defaulting the plan A missed plan payment or current-year tax payment can cancel the plan and significantly increase the recalculated balance.

Open official redemption guidance

Penalty correction

Before filing a penalty refund or correction claim

The Treasurer-Tax Collector provides a formal claim process, but state law limits when penalties can be waived. The county specifically says the following explanations are not enough by themselves:

“I never received the tax bill.”

“I thought my mortgage company would pay.”

“My bank sent the payment late.”

“I have always paid on time before.”

“The mailed payment arrived late without a timely USPS postmark.”

“I am a new homeowner and did not know the tax was due.”

If you believe the county made an error: Use the current official claim form rather than an old saved PDF. The county warns that forms change periodically.

Open the current penalty-claim page

Payment planning

Monthly payments, e-billing and reminders

Easy Smart Pay

A private third-party service that divides current-year secured property taxes into monthly payments and sends the required tax payment to the county when due.

The county says this option is for taxpayers without an impound or escrow account.

My County Connect e-billing

Annual secured and unsecured tax bills can be received by email, and users can view payment status and download a PDF copy.

A current tax bill with an e-bill PIN is needed to sign up; paper bills continue for now.

Defaulted-tax plan

The five-year redemption plan is a county statutory arrangement for already-defaulted secured taxes. It is not the same as Easy Smart Pay.

Reminder is not a deadline extension. Failure to receive an e-bill or reminder does not excuse a statutory penalty.

Review county e-billing Review monthly-payment option

Final payment check

Before you submit money

Current roll year is selected

Assessment and fee parcel match

You are not paying another person’s unsecured bill

The installment and delinquency date are understood

The processor fee is acceptable

ACH company IDs are authorized if your bank blocks debits

Mail has a qualifying USPS postmark when needed

Confirmation, check copy or receipt is saved

San Joaquin County Treasurer-Tax Collector map

Confirm Suite 150 before entering a line

Bring the bill or 12-digit assessment number

Bring payment proof for posting questions

Remember the Assessor is Suite 230 on the second floor

Official sources

Use these county pages when you are ready to act

Payment and collection

Assessment and homeowner help

Source review: August 13, 2026. Live balances, processor fees, statutory deadlines, office availability and account status can change. The taxpayer’s bill and official county systems control at the time of action.

San Joaquin Treasurer-Tax Collector FAQs

How do I look up and pay San Joaquin County property taxes online?

Use the San Joaquin County-authorized property tax search and payment portal. Search the current roll by assessment number or fee parcel number, verify the tax year and assessment, then choose e-check, debit card or credit card. E-check is listed at no cost; debit and credit card service fees apply.

What is the San Joaquin County Treasurer-Tax Collector phone number?

The office phone number is 209-468-2133. The county also lists 866-628-9244 for technical online-payment assistance and 877-777-3839 for phone payments.

Where is the San Joaquin County Treasurer-Tax Collector office in Stockton?

The office is at 44 North San Joaquin Street, First Floor, Suite 150, Stockton, CA 95202. Published hours are 8:30 a.m.–4:30 p.m. weekdays excluding holidays, with the office open until 5:00 p.m. on delinquent dates.

What are the San Joaquin County online property tax payment fees?

The county lists e-check at no cost, debit card at $3.49 per transaction and credit card at 2.29% of the amount paid with a $1.35 minimum. The service fees are charged by the payment processor rather than the County.

When are San Joaquin County secured property taxes due?

The standard secured schedule is first installment due November 1 and delinquent after 5:00 p.m. December 10, then second installment due February 1 and delinquent after 5:00 p.m. April 10. When a delinquency date falls on a weekend or legal holiday, the deadline moves to the next business day.

What happens if San Joaquin County property taxes become delinquent?

A late first installment receives a 10% penalty. A late second installment receives a 10% penalty plus a $10 cost. If secured taxes remain unpaid after June 30, the property becomes tax defaulted and additional fees and 1.5% monthly redemption penalties can accrue.

How do I search San Joaquin County property assessment records?

Use the San Joaquin County Assessor’s assessed-value lookup. Current and prior-year assessment information can be searched by address, assessment number or fee parcel number. The Assessor office phone is 209-468-2630.

Should I contact the San Joaquin Tax Collector or Assessor?

Contact the Treasurer-Tax Collector for tax bills, balances, payments, receipts, penalties, liens, redemption and tax-sale questions. Contact the Assessor for assessed value, ownership or assessment records, mailing-address changes and valuation review.

Do mortgage or escrow payments cover supplemental property tax bills?

Not necessarily. San Joaquin County says supplemental bills are mailed to the property owner and not to lending agencies. A homeowner with an impound or escrow account should contact the lender specifically about the supplemental bill and should not assume it will be paid automatically.

Can I make monthly payments on San Joaquin County property taxes?

San Joaquin County offers access to Easy Smart Pay, a private third-party service for monthly payments on current-year secured property taxes for taxpayers who do not have an impound or escrow account. This is separate from the county’s redemption installment plan for tax-defaulted property.