Property Tax
Alameda County property tax services allow taxpayers to look up bills, identify the correct account, review payment options, and obtain forms for certain payment problems or relief requests. This article explains how to use the county’s official property tax systems, distinguish secured and supplemental bills from unsecured accounts, prepare the information needed for a search, track annual secured tax deadlines, and contact the appropriate office or portal support service.
Which Property Tax System Applies?
The Alameda County Property Tax portal separates real property taxes from business or personal property taxes. Choosing the appropriate category matters because the search systems ask for different identifiers. A parcel number is used in the secured and supplemental property search, while an assessee account number is used in the unsecured search.
The Real Property section provides access to secured and supplemental bills. It allows users to pay, look up, or download those bills. The Business or Personal Property section provides payment and lookup services for unsecured taxes, including taxes associated with boats, business personal property, and possessory interests.
The portal also provides access to other payment methods, tax due date reminders, application forms, and information about the county’s limitations on monthly payments. The Office of the Treasurer and Tax Collector is the county office identified for property tax collection and the secured payment information provided through these services.
Before searching, identify the type of bill you have and the account information printed on it. This helps prevent a common mistake: entering an identifier into a search field designed for a different property tax category.
Secured and Supplemental Bill Searches
The county’s secured and supplemental property tax search accepts either a property address or a parcel number. An address search is available when you want to locate a property through its location. A parcel search uses the identifier printed on the tax bill.
Parcel and tracer numbers appear in the upper-left-hand corner of a secured or supplemental tax bill. Although both numbers appear there, the parcel search specifically asks for the parcel number. Do not substitute the tracer number simply because it is printed nearby.
Parcel Number Formatting
Enter the parcel number as it appears on the bill, including its dashes and without leading zeroes. Formatting is part of the county’s search instructions. Removing the dashes or adding zeroes changes the entry from the format the portal requests.
If a parcel search does not locate the expected property, compare the entry with the bill before trying again. Confirm that you copied the parcel number rather than another number on the document. You can also use the property address search offered on the same page.
Bill Selection Before Payment
The portal allows bills to be added to a cart from search results or an account summary. Locating an account and selecting a bill are separate steps. Review the property and bill information presented before adding a bill to the cart, particularly when you are handling taxes for more than one property.
Secured and supplemental bills are accessible through the same real property service, but they remain distinct bill types. Keep that distinction in mind when reviewing the account. The annual secured installment schedule described below should not be treated as a substitute for reviewing the payment information on a supplemental bill.
Unsecured Business and Personal Property Taxes
The unsecured property tax account search uses an assessee account number. This is the search route provided for the portal’s Business or Personal Property category, which includes boats, business personal property, and possessory interests.
An assessee account number serves a different purpose from a real property parcel number. If you are looking up an unsecured account, use the identifier requested by that search screen. Switching to a parcel number or entering a property address does not follow the unsecured search instructions.
Keep the relevant account paperwork available while searching and paying. When managing both real property and business or personal property taxes, separate the bills by account type before beginning. This makes it easier to match each bill with the appropriate county service and reduces the chance of selecting a payment for the wrong account.
Annual Secured Tax Payment Dates
Alameda County’s secured payment information identifies two annual installments. The first installment is due November 1 and becomes delinquent after December 10. The second installment is due February 1 and becomes delinquent after April 10.
A due date and a delinquency date are different milestones. Both belong on your payment calendar. When preparing an annual secured tax payment, identify which installment you are paying and review the corresponding dates rather than relying on a general reminder that property taxes are due twice a year.
First annual secured installment: due November 1; delinquent after December 10.
Second annual secured installment: due February 1; delinquent after April 10.
The portal displays a notice stating that 2026–27 annual secured bills are available October 7, 2026. That bill availability date is separate from the installment due dates. Access to a newly available bill gives you the opportunity to review the account and prepare for payment.
The county also offers an email subscription for reminders when important tax dates are approaching. The subscription field appears on the property tax pages. Enter your email address there if you want the county’s reminders, while keeping your own record of the dates associated with your bills.
Online and Other Payment Methods
The county identifies online payment as its preferred way to pay property taxes and avoid late fees. The portal provides payment access through the real property and business or personal property categories. Bills can be added to the cart from an account summary or search results.
Before proceeding with a selected bill, compare it with the property or account you intend to pay. The county’s relief forms specifically recognize that a payment can be made to an incorrect property by mistake. Reviewing the account selection before payment helps address that problem at the point where it can be avoided.
The county’s other property tax payment methods page identifies four alternatives to paying online: in person, by mail, by phone, and by wire transfer. Refer to that official page when choosing one of those methods and preparing the payment.
For questions involving returned checks, the payment methods page directs users to the county’s returned-check information. A returned payment is different from an ordinary late payment. That distinction also matters when selecting a form, because the online penalty waiver form expressly excludes fees caused by returned checks from financial institutions.
Monthly Payment Limitations
The county’s secured monthly payment information states that its computer systems cannot accept more than the two annual installments. Taxpayers should not assume that the county portal will accept a series of monthly payments toward a current annual secured bill.
This limitation is especially relevant when planning how to cover the annual tax amount. A personal monthly payment arrangement does not change the county’s stated installment dates: November 1, delinquent after December 10, and February 1, delinquent after April 10.
The county’s current-year payment limitation is also separate from its installment plan for prior-year secured delinquencies. The delinquency plan addresses taxes that have already been unpaid for one or more years. It is not described as a monthly payment option for the current annual secured bill.
Forms for Relief and Delinquent Taxes
The property tax application forms page provides documents for military tax relief, an installment plan agreement, and an online penalty waiver request. Choose the form that addresses your specific situation. These applications serve different purposes and should not be treated as interchangeable ways to change a bill.
The military relief application and installment plan agreement are provided as PDF documents. The penalty waiver is identified as an electronic submission. Read the applicable instructions and gather the relevant bill information before completing a request.
Military Personnel Tax Relief
The county states that military personnel on active duty are eligible to defer payment of their taxes under the provisions of the Soldiers’ and Sailors’ Civil Relief Act. Under the relief described on the forms page, unpaid taxes are subject to interest at six percent per year instead of the penalties, costs, and fees imposed under California law.
The application may be completed by the military service person, an adult dependent, or another individual authorized by the service person to act on their behalf. The county instructs applicants to complete the information and file the form with the Tax Collector.
This application concerns a deferral of payment. Keep its stated purpose distinct from a request to cancel a late-payment penalty or an agreement to redeem property with prior-year delinquent secured taxes.
Prior-Year Secured Installment Plans
A property owner with prior-year secured property tax delinquencies may initiate an installment plan of redemption. The county describes this plan as a means of paying secured property taxes that have been delinquent for one or more years, in five or fewer installments under the California Revenue and Taxation Code.
While the plan remains in good standing, the county states that the property may not be tax-defaulted subject to the power to sell, nor may the right of redemption be terminated. Remaining in good standing is therefore a significant condition of the protection described for the plan.
Use the installment plan agreement when addressing that category of delinquency. Do not confuse it with the county’s two-installment collection system for current annual secured taxes.
Late-Payment Penalty Waiver Requests
The county explains that penalties for late tax payments are imposed automatically under California law. Relief is available only under limited conditions. The online waiver form allows you to explain why relief should be granted and upload documentation supporting the request.
Have the tax bill in front of you before completing the electronic form. The county specifically states that the bill contains information necessary for the submission. Preparing the bill and supporting records together helps you connect your explanation with the correct tax account and payment.
The circumstances identified on the county forms page include:
Proof that the United States Postal Service took custody of the payment on or before the delinquency date.
A payment made to an incorrect property by mistake.
An error expressly made by the Tax Collector, Auditor, or Assessor.
Circumstances beyond the taxpayer’s control that occurred despite ordinary care and without willful neglect.
Penalty cancellation to correct a specific Alameda County error.
For circumstances beyond the taxpayer’s control, the county gives examples that may qualify. These include specific medical conditions causing unexpected hospitalization on the delinquency date when there is no joint property owner, natural disasters such as wildfires, the death of the property owner of record on or before the delinquency date, and a government-declared state of emergency.
Those examples are described as circumstances that may qualify, rather than automatic grounds for approval. Explain the reason for your request and provide documentation that supports it. Do not use this electronic form to request relief from fees incurred because a financial institution returned a check; the county expressly excludes those fees from this form.
Portal Maintenance and Technical Support
System maintenance and nightly processing generally occur on Sunday mornings from 7:00 to 9:00 a.m. and on weeknights from 1:00 to 2:00 a.m. The property tax system may be temporarily unavailable during those periods.
If you cannot reach a search or payment page during a stated maintenance window, try again after the window ends. Plan time to review and pay bills without depending on access during scheduled processing periods.
The county’s Property Tax Portal Support contact form provides a way to send a portal question or comment. Subject, email address, and message are required fields. The form also includes a full-name field.
Describe which service you were using, such as the secured parcel search or the unsecured assessee account search, and the problem you encountered. Distinguishing the search type makes the question clearer. The county states that personal information collected through the form is used only for communications regarding the question or comment.
Property Tax Office
Alameda County Office of the Treasurer and Tax Collector
Alameda County Administration Building
1221 Oak Street, Room 131
Oakland, California 94612
Property Tax FAQs
Can my mortgage payment include property taxes?
Yes. Alameda County’s guidance on budgeting for secured property taxes suggests asking your mortgage lender about an impound account. With this arrangement, your lender adds an amount for property taxes to your monthly mortgage payment, collects those funds, and pays the county on the required dates. This can help you spread the expense across the year instead of setting aside the full amount shortly before each tax payment.
Ask your lender whether an impound account is available for your mortgage and how much it would add to your monthly payment. Before relying on the arrangement, clarify when the lender will begin collecting funds and which tax payment it will cover first. The county describes this option as a service banks can provide at no cost; confirm the terms that apply to your account.
How much should I save each month?
The county suggests using a separate interest-earning savings account to prepare for your annual secured property taxes. Start with your current annual tax amount, add approximately 3% to allow for rising valuations and voter-approved measures, and divide the result by 12. For example, if your annual taxes are $8,000, adding 3% produces a savings target of $8,240, or approximately $686.67 per month.
Treat the extra 3% as a budgeting cushion, not a guaranteed limit on future increases or a calculation of your actual bill. Review the amount when your next bill becomes available and adjust your savings accordingly. The money remains in your savings account until you use it to make the tax payments, so monthly deposits alone do not pay the county.