Alameda County Tax Collector: Property Tax Search, Payment & Offices
If you are looking for the Alameda County Tax Collector, the office you need is the Alameda County Treasurer-Tax Collector. Most property-tax questions can be handled online through the county’s official property-tax portal. You can look up a bill, check an account, make a payment, review payment information and find official instructions before visiting the Oakland office.
Quick answer: where is the Alameda County Tax Collector?
The Alameda County Treasurer-Tax Collector handles property-tax collection for Alameda County. The main property-tax collection office is at 1221 Oak Street, Room 131, Oakland, CA 94612. The official county contact page lists the property-tax collection phone as (510) 272-6800 and lists call-center and office hours as 8:30 a.m. to 4:30 p.m.
For most property-tax tasks, you do not need to visit the office. Alameda County provides an official online property-tax portal for looking up and paying secured, supplemental and unsecured property taxes. If you are dealing with property value, an exemption or another assessment issue, the Alameda County Assessor is generally the better place to start.
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On this page: Alameda County Tax Collector help
How to find the official Alameda County Tax Collector
The official department is called the Alameda County Office of the Treasurer-Tax Collector. If you reached this page through a search engine, use the official county website or property-tax portal before entering payment information.
Property Tax Penalty & Interest Calculator
State-specific penalty rates • Interest accrual • Tax lien deadline • Cost-of-waiting breakdown
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Property tax payment and lookup
Use the county’s property-tax portal to search tax records and pay applicable secured, supplemental or unsecured property taxes.
Open Alameda County Property Tax PortalTreasurer-Tax Collector department
The department website contains official tax-collection information, FAQs, tax-defaulted-land resources, business-license information and contact details.
Open Treasurer-Tax CollectorCheck the domain before paying
Tax payment is a financial transaction. Do not use an unexpected payment link from an email, advertisement or unofficial directory when you can navigate to the county’s official property-tax portal directly.
What does the Alameda County Tax Collector handle?
The Treasurer-Tax Collector is responsible for collecting property taxes and related amounts shown in county tax records. The office also provides other county financial and tax-related services, but not every property question belongs to the collection office.
Start with the office that controls the issue
Alameda County property tax search: what information do you need?
The county’s online property-tax system separates property-tax searches by tax type. Before starting, have the information from your tax bill available. This reduces the chance of opening the wrong search path or paying the wrong account.
Secured property tax
Use the real-property search route for property taxes secured by real property. Your parcel number or property address can be important for locating the correct account.
Supplemental property tax
A supplemental bill can arise after a change in ownership or completion of new construction changes the assessed value. Treat it separately from the regular annual bill.
Unsecured property tax
Business personal property, boats, possessory interests and other unsecured accounts use a different account-based path.
Have these details ready
- Assessor’s Parcel Number (APN) or parcel number, when applicable.
- Property address and unit information.
- Assessee account number for applicable unsecured accounts.
- Tax year and installment.
- Tax bill, payment coupon or tracer information if available.
How to pay Alameda County property taxes online
The easiest route for many taxpayers is the official Alameda County property-tax portal. Do not begin with a third-party payment site. Open the county portal, locate the correct account and verify the tax details before submitting payment.
- Open the official portal. Go directly to Alameda County’s property-tax payment and lookup website.
- Select the correct tax type. Determine whether you are paying secured, supplemental or unsecured/business personal property tax.
- Search the account. Enter the parcel, address or account information requested by the applicable search screen.
- Match the record. Confirm the property, taxpayer/account, tax year, installment and amount due.
- Choose a payment method. Alameda County currently lists online eCheck and electronic payment options; transaction fees can vary by method.
- Save the confirmation. Keep your confirmation number and payment details, then verify the account shows the payment after processing.
eCheck can be useful when timing and fees matter
Alameda County’s current payment information states that online eCheck is accepted without a fee. Credit-card and certain other electronic payment methods can carry transaction fees. Always review the final payment screen before submitting.
Do not assume a payment is posted instantly
Keep the acknowledgement or confirmation. For eCheck payments, the county advises checking with the financial institution within the applicable processing period and then confirming the county account after processing.
Alameda County property tax due dates
Regular secured property taxes are generally split into two installments. Alameda County’s official FAQ states that the first installment is due November 1 and becomes delinquent after 5 p.m. December 10. The second installment is due February 1 and becomes delinquent after 5 p.m. April 10.
| Date | What it means | What to do |
|---|---|---|
| November 1 | First secured property-tax installment due. | Review the bill and payment method early. |
| December 10, 5 p.m. | First installment becomes delinquent after the cutoff. | Pay before the deadline whenever possible. |
| February 1 | Second secured property-tax installment due. | Confirm your second installment and any escrow arrangements. |
| April 10, 5 p.m. | Second installment becomes delinquent after the cutoff. | Do not rely on last-minute mailing or bank processing. |
| August 31 | Unsecured-roll taxes are generally due by 5 p.m. or close of business, whichever is later. | Use the appropriate unsecured-account instructions. |
Weekend and holiday rule
Alameda County’s official FAQ states that when December 10 or April 10 falls on a Saturday, Sunday or legal holiday, no penalty is charged when payment is made by 5 p.m. on the next business day. Check the current county instructions for the applicable tax year.
Alameda County property tax late-payment penalties
Missing an installment deadline can increase the amount you owe. For secured property taxes, Alameda County states that the first installment receives a 10% penalty after the December 10 deadline. For the second installment, a 10% penalty plus a $10 cost is added after the April 10 deadline.
First installment
Due November 1. If unpaid after 5 p.m. December 10, a 10% delinquent penalty attaches under the county’s stated schedule.
Second installment
Due February 1. If unpaid after 5 p.m. April 10, the county states that a 10% penalty and $10 cost attach.
Mailing close to the deadline can be risky
Alameda County has warned taxpayers about USPS postmark processing changes. A mailbox pickup date is not necessarily the same as the date USPS processes the mail. If a deadline is close, consider an official electronic payment route or deliver the payment according to the county’s current instructions.
Can a penalty be removed?
Do not assume a late-payment penalty will automatically be waived. Alameda County provides penalty-waiver resources for qualifying circumstances, but relief is governed by specific requirements and may require supporting documentation.
Check Official Tax Forms & Payment InformationWays to pay Alameda County property taxes
Alameda County provides multiple payment routes. The right choice depends on how close you are to the deadline and whether you need immediate confirmation.
| Method | Useful for | Important consideration |
|---|---|---|
| Online eCheck | Electronic payment without a card. | County information states that eCheck is accepted online without a fee; verify bank acceptance and posting. |
| Credit card | Taxpayers who prefer card payment. | A transaction/convenience fee applies. |
| PayPal / electronic options | Available electronic payment routes when offered by the county portal. | Review the final transaction terms; certain transactions may be final once submitted. |
| Phone | Telephone payment and property-tax information. | Call (510) 272-6800 and follow the current automated instructions. |
| Taxpayers paying by check. | Mail early and follow the address and payment instructions on the current bill. | |
| Drop-off | Taxpayers using an official county drop-off location. | Do not put cash in a drop box or mail slot. |
| Bank bill pay | Taxpayers using their financial institution. | The bank’s processing date may not equal the county’s receipt/postmark date. |
Never send cash
Alameda County specifically warns taxpayers not to mail or drop off cash payments. Use an accepted check, cashier’s check, money order or official electronic method instead.
Alameda County Tax Collector office location, hours and phone
Oakland property-tax collection office
1221 Oak Street, Room 131Oakland, CA 94612
Phone: (510) 272-6800
Listed call-center hours: 8:30 a.m.–4:30 p.m.
Listed office hours: 8:30 a.m.–4:30 p.m.
Hayward Business License Tax office
224 W. Winton Avenue, Room 169Hayward, CA 94544
Business License Tax: (510) 670-6400
Listed office hours: 8:30 a.m.–4:30 p.m.
This is a Business License Tax location, not a replacement for the Oakland property-tax collection office.
Do not assume every county address handles every service
Alameda County lists different locations for property-tax collection and Business License Tax services. Confirm the service and address before travelling.
Mortgage escrow and Alameda County property taxes
If your mortgage company normally pays your property taxes, you should still check the Alameda County tax account. An escrow balance on your mortgage statement does not by itself prove that the county has received and posted the specific installment.
- Check the county account. Look up the property using the official tax portal.
- Confirm the installment. Make sure the first or second installment shows the correct status.
- Contact the mortgage servicer. If the county shows an unpaid balance, ask the lender for the payment date, amount and payment reference.
- Watch for supplemental bills. A new owner may receive a supplemental property-tax bill that should not automatically be assumed to be included in regular escrow payments.
- Keep documentation. Save the county record, lender correspondence and payment confirmation.
Recent home purchase?
If you recently bought property in Oakland, Berkeley, Fremont, Hayward, Alameda, Livermore, Dublin, Pleasanton, San Leandro, Union City or another Alameda County community, check whether a supplemental tax bill applies. A regular annual tax payment does not necessarily resolve every supplemental assessment.
How to prove an Alameda County property tax payment
Keep payment evidence until the county account reflects the payment correctly. Alameda County provides online tax information, and its official materials also recognize payment records such as a canceled check as useful evidence.
For an online payment
- Save the confirmation number.
- Record the amount and installment.
- Keep the payment date.
- Save the parcel or account number.
- For eCheck, retain bank acceptance information.
- Return to the county portal and confirm the paid status.
For a mailed check
- Keep a copy of the check.
- Keep the payment coupon or bill information.
- Retain the bank’s cleared-check record.
- Keep the parcel/account information used with the payment.
- Do not rely only on the date you placed the envelope in a mailbox.
Alameda County Tax Collector vs. Assessor: which office do you need?
Many property owners lose time because they contact the Tax Collector about an issue that belongs to the Assessor. The easiest distinction is this: the Tax Collector handles collection; the Assessor handles many valuation and assessment matters.
| Your problem | Best starting point | Reason |
|---|---|---|
| Pay my property tax | Tax Collector | The Treasurer-Tax Collector handles collection and payment records. |
| Check whether payment posted | Tax Collector | The collection system contains payment status information. |
| Print or obtain tax information | Tax Collector | The official tax system provides property-tax account information. |
| Assessed value seems wrong | Assessor | The Assessor handles property valuation and assessment functions. |
| Homeowners’ exemption question | Assessor | Exemptions are generally an assessment-side issue. |
| Ownership or parcel-record problem | Assessor | Property records and assessment information are handled by the appropriate county property office. |
| Tax-defaulted property sale | Tax Collector | The Treasurer-Tax Collector administers the county tax-defaulted-land sale process. |
An assessment dispute does not automatically stop the tax deadline
If you are disputing value, ownership, exemption or another assessment issue, confirm with the appropriate county office whether payment is still required by the applicable deadline.
Alameda County Business License Tax
The Alameda County Treasurer-Tax Collector also administers the Business License Tax for businesses operating in unincorporated Alameda County. This is separate from property tax and should not be confused with a city business-license requirement.
Who may need it?
Alameda County states that business activity in the unincorporated area generally requires a county Business License, even if the business is based elsewhere.
Renewal
The county states that the license is renewed each January 1 while the business continues operating in the applicable area.
Separate city rules
Doing business in a city can create separate city requirements. One county license does not automatically satisfy every city or county obligation.
Current county fee information
The county’s Business License Tax FAQ currently lists a $20 business-license cost plus a $4 CASp fee. Online credit-card applications can also have a separate non-refundable convenience fee. Confirm the current amount with the county before submitting an application.
Alameda County tax-defaulted land and tax sales
Tax-defaulted property is different from an ordinary late tax bill. Alameda County explains that a tax sale is intended to collect taxes that have remained unpaid for at least five years. Properties subject to the county’s power to sell can be offered through a public auction.
Tax-defaulted property is not a normal tax certificate
Alameda County states that California counties do not currently sell tax certificates in the way some other states do. A California tax-defaulted-property sale follows a different process.
Public auction
County tax-sale property is sold through the applicable public auction process. The county states that properties are sold as-is and bidders must investigate the property before bidding.
Tax sale research requires more than the tax amount
Potential bidders should investigate parcel location, zoning, title issues, easements, liens and the current auction status. The county warns that not all liens or encumbrances necessarily disappear through the sale.
Common Alameda County Tax Collector mistakes
Using the wrong tax search
Secured and unsecured accounts do not follow the same search path. Identify the tax type first.
Waiting until the deadline
Mail, bank bill-pay and electronic processing can introduce timing issues. Start early when a penalty deadline is close.
Assuming escrow paid
Check the county account instead of relying only on the mortgage statement.
Calling the wrong office
Value and exemption issues commonly belong with the Assessor rather than the Tax Collector.
Ignoring a supplemental bill
A change in ownership or new construction can result in supplemental assessment and billing.
Sending cash
Use an accepted payment method. Alameda County warns against mailing or dropping cash.
Alameda County property-tax checklist
Before paying
- Confirm Alameda County is the correct jurisdiction.
- Check the tax year.
- Identify first, second, supplemental or unsecured tax.
- Match the parcel/account and property address.
- Check whether an escrow company should pay.
- Review the payment method and any transaction fee.
After paying
- Save the confirmation or payment record.
- Keep a cleared-check record if paying by check.
- Confirm the county account shows the payment.
- Keep documentation for escrow or title records.
- Do not discard the tax bill until the account is resolved.
- Check again if the payment was close to a deadline.
Official Alameda County Tax Collector resources
Alameda County Tax Collector FAQ
Where is the Alameda County Tax Collector located?
The main property-tax collection office is at 1221 Oak Street, Room 131, Oakland, CA 94612.
What is the Alameda County Tax Collector phone number?
The official property-tax collection phone number is (510) 272-6800.
What are the Alameda County Tax Collector office hours?
The county’s official contact page lists property-tax call-center and office hours as 8:30 a.m. to 4:30 p.m. Monday through Friday. Check the official county site for holiday closures and deadline-day changes before travelling.
How do I pay Alameda County property taxes online?
Use the official Alameda County property-tax portal, select the appropriate tax type, locate your account, verify the property and tax year, then select an available payment method.
When is the first Alameda County property tax installment due?
The first regular secured-property-tax installment is due November 1 and becomes delinquent after 5 p.m. December 10 under the county’s stated schedule.
When is the second Alameda County property tax installment due?
The second regular secured-property-tax installment is due February 1 and becomes delinquent after 5 p.m. April 10 under the county’s stated schedule.
What is the late penalty for Alameda County property tax?
The county states that a 10% delinquent penalty attaches after the first-installment deadline. For the second installment, a 10% penalty plus a $10 cost is assessed after the April 10 cutoff.
Can I pay Alameda County property taxes by eCheck?
Yes. Alameda County’s current payment information states that online eCheck is accepted without a fee. Processing and bank-acceptance timing should still be checked before a deadline.
Does Alameda County charge a fee for credit-card property tax payments?
A transaction or convenience fee can apply to credit-card payments. Review the payment screen for the current fee before submitting.
Can I pay Alameda County property taxes by phone?
Alameda County provides a property-tax telephone system at (510) 272-6800. Follow the current automated instructions when using telephone payment services.
What if my mortgage company is supposed to pay my Alameda County property taxes?
Check the county account to confirm whether the installment was actually received and posted. If it is unpaid, contact your mortgage servicer and request the payment date, amount and payment reference.
Who handles Alameda County property value or exemption questions?
The Alameda County Assessor generally handles assessed value, exemptions, ownership and many assessment-related property-record questions. The Tax Collector is primarily responsible for collecting the resulting tax bill.
What is an Alameda County supplemental property tax bill?
A supplemental assessment can occur after a change in ownership or completion of new construction changes the assessed value. A supplemental bill should be treated separately from the regular annual property-tax bill.
Does Alameda County have a Business License Tax?
Yes. Alameda County administers a Business License Tax for applicable business activity in unincorporated areas. Separate city requirements can also apply.
Does Alameda County sell tax lien certificates?
No. Alameda County’s tax-defaulted-land FAQ states that California counties do not currently sell tax certificates. Tax-defaulted property follows California’s tax-sale process instead.
When can Alameda County sell tax-defaulted property?
The county states that its tax-sale process is intended to collect taxes that have remained unpaid for at least five years. Properties subject to the county’s power to sell may be offered through public auction.
Should I use a third-party site to pay Alameda County property taxes?
For payment, the safest approach is to navigate directly to the official Alameda County property-tax portal and verify the property, tax year and amount before submitting financial information.
Use the Alameda County Tax Collector in the right order
For most property owners, the simplest process is: identify the tax account → use the official Alameda County portal → verify the property and installment → pay → save proof → confirm posting.
- Use the official county property-tax portal for online lookup and payment.
- Remember the regular secured-tax dates: November 1, December 10, February 1 and April 10.
- Do not wait until the final hour when mailing or using bank bill pay.
- Check escrow payments directly against the county account.
- Contact the Assessor for valuation and exemption issues.
- Keep payment confirmations and cleared-check records.
- Use the official county website before entering payment information.
Official starting point: Alameda County Property Tax Portal.
Information reviewed September 14, 2026. TaxCollectors.org is an independent information website and is not Alameda County or the Alameda County Treasurer-Tax Collector. Office hours, payment methods, fees, deadlines, payment-processing rules and county procedures can change. Verify transaction-specific information with the official Alameda County source before paying or visiting.