The Agent Authorization Form (BUSMF901) is the form the Business Division of the San Diego County Assessor/Recorder/Clerk uses to record that a business has authorized an agent to sign and file its Business Property Statement. It is one of the San Diego County property tax forms for business owners, and the owner or a corporate officer signs it. On this page you can fill out the form online on FillingPDF and download or print the completed PDF; the official PDF is published by the County at arcc.sandiegocounty.gov.
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What is BUSMF901?
The Agent Authorization Form (BUSMF901) is the San Diego County Assessor/Recorder/Clerk form on which a business owner or corporate officer authorizes an agent to sign the Declaration by Assessee on the Business Property Statement for the current filing year.
The form is issued by the Business Division. It has three blocks: Business Information (business name, DBA and every business account number), Agent Information (name, address, phone, fax and e-mail) and Taxpayer Information (signature, date, printed name, title and contact details). Fields marked with an asterisk are required.
Besides signing the statement, the authorization entitles the agent to:
- submit the Business Property Statement (R&T Code 441);
- amend the Business Property Statement (R&T Code 441(i));
- request copies (R&T Code 443.1);
- review the current year assessment with Assessor staff.
The taxpayer also acknowledges that, even after delegating this authority, it may be required to furnish additional information on request. The edition on this page states that the authorization is effective January 1, 2026 through December 31, 2026.
The form is not an address change form. It says so on its face and refers to separate instructions for changing where statements, correspondence and assessments are mailed. The Assessor's forms page lists a separate Change of Address form for business personal property.
Who needs to file BUSMF901?
The main group is businesses that file a Business Property Statement with the San Diego County Assessor and want another person, such as an accountant or a tax service, to act for them. The owner or a corporate officer of the business completes and signs the form; the person named as agent is the one who receives the authority.
Points the form itself makes:
- List every business account number the authorization covers. If the space is not enough, attach an additional sheet.
- The agent may sign the Declaration by Assessee, submit and amend the statement, request copies and review the current year assessment with Assessor staff. The form grants nothing beyond those items.
- The signer must be the owner or a corporate officer of the business. The form does not provide for any other signer.
- Do not use it to change a mailing address. The form states it does not constitute an address change form.
A business that signs and files its own statement does not need to name an agent on this form.
When to file BUSMF901
Complete this form when you want an agent to act for your business on its Business Property Statement for the current filing year. The form prints no separate due date. It states that the authorization is effective January 1, 2026 through December 31, 2026, so the authorization lapses at the end of that period.
Because it covers only the filing year printed on it, plan to complete a new authorization for a later year if you still want the agent to act. Have the authorization in place before the agent signs, submits or amends the statement on your behalf. For deadlines that apply to the Business Property Statement itself, contact the Business Division at 858/505-6100.
Documents you need
- An additional sheet listing each business account number, only if the account numbers do not fit in the space provided on the form.
How to fill out BUSMF901
Enter the business name and DBA
Under Business Information, write the Business Name (required) and the DBA if the business operates under one.
List every business account number
In Business Account Number(s) (required), list each account number the authorization should cover. Attach an additional sheet if necessary.
Enter the agent's name and address
Under Agent Information, complete Name and Address; both are required.
Add the agent's contact details
Enter the agent's Phone Number (required). The FAX Number and E-Mail Address are not marked as required.
Review the authority you are granting
Read the statement that the agent may sign the Declaration by Assessee, submit and amend the Business Property Statement, request copies and review the current year assessment. The wording is fixed on the form.
Sign and date as owner or officer
Under Taxpayer Information, the owner or a corporate officer of the business signs in Signature and enters the Date; both are required.
Enter the signer's name and title
Fill in Printed Name and Title, then the signer's Phone Number (required). FAX Number and E-Mail Address are optional.
Check the effective period
Confirm the printed period, January 1, 2026 through December 31, 2026, matches the filing year you mean to authorize.
Review and download the completed PDF
Check that every required field is complete, then download or print the completed PDF from FillingPDF and send it as described under How to submit.
How to submit BUSMF901
The form prints no delivery instruction of its own, so use the contact details in its header for the Business Division of the San Diego County Assessor/Recorder/Clerk:
- Address: 9225 Clairemont Mesa Blvd., San Diego, CA 92123-1211.
- Phone: 858/505-6100.
- Fax: 858/505-6266.
- Website: www.sdarcc.gov.
Call the Business Division before you send the signed form to confirm which of these channels it accepts for the authorization. The taxpayer's signature and date are required, and the authorization covers only the filing year printed on it. Do not use it to change a mailing address: the form says it is not an address change form and refers to separate instructions. FillingPDF lets you fill out and download the PDF; submission follows the agency's channels.
Common mistakes to avoid
- Leaving out a required field marked with an asterisk, such as the business name, the business account number(s), the agent's name, address and phone, or the taxpayer's signature and date.
- Listing only one business account when the authorization should cover several; the form asks you to list each account number and attach an additional sheet if necessary.
- Having someone other than the owner or a corporate officer sign in the Taxpayer Information block.
- Using the form to change where statements, correspondence or assessments are mailed; it states it is not an address change form.
- Assuming the authorization continues after December 31, 2026, when this edition limits it to January 1, 2026 through December 31, 2026.
- Expecting the agent to do more than the form lists: signing the Declaration by Assessee, submitting or amending the statement, requesting copies and reviewing the assessment with Assessor staff.
- Forgetting that the business may still be asked for additional information even though it delegated authority to the agent.
Frequently asked questions
What is the Agent Authorization Form (BUSMF901)?
It is the San Diego County Assessor/Recorder/Clerk form on which a business owner or corporate officer authorizes an agent to sign the Declaration by Assessee on the Business Property Statement for the current filing year. The Business Division issues it.
What can the agent do under this authorization?
The agent may submit the Business Property Statement (R&T Code 441), amend it (R&T Code 441(i)), request copies (R&T Code 443.1) and review the current year assessment with Assessor staff, in addition to signing the Declaration by Assessee.
Who must sign the Agent Authorization Form?
The Taxpayer Information block is signed by the owner or a corporate officer of the business. The form marks the signature, date, printed name, title and phone number as required, so complete all of them.
How long does the agent authorization last?
It covers the current filing year. The edition on this page states it is effective January 1, 2026 through December 31, 2026. For a later year, complete a new authorization if you still want the agent to act.
Can I use this form to change my business mailing address?
No. The form states it does not constitute an address change form and points to separate instructions for changing where statements, correspondence and assessments are mailed. The Assessor's forms page lists a Change of Address form for business personal property.
What if my business has more than one account number?
List each account number in the Business Account Number(s) field. The form says to attach an additional sheet if necessary, so use one when the space on the form is not enough.
Where do I send the signed Agent Authorization Form?
The form names no delivery channel. Its header gives the Business Division address, 9225 Clairemont Mesa Blvd., San Diego, CA 92123-1211, phone 858/505-6100 and fax 858/505-6266; call to confirm how the Division accepts the signed authorization.
Can I fill out the Agent Authorization Form online on FillingPDF?
Yes. You can fill out the PDF online on FillingPDF and download or print it. FillingPDF is an independent service and does not file the form with the County; you submit it through the Assessor's channels.
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