Change of Address - Real Property (Residential/Commercial), printed on the form as the Request for Change of Address on Real Property (form AC9), is the San Diego County Assessor/Recorder/County Clerk form for updating the mailing address on your property taxes and assessment information. It is one of the forms the Assessor publishes for San Diego County property tax records, and it covers up to five parcels on a single sheet. On this page you can fill out the form online on FillingPDF and download or print the completed PDF; the original PDF is published by the Assessor at arcc.sandiegocounty.gov.
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What is AC9?
Change of Address - Real Property (Residential/Commercial) is the San Diego County Assessor/Recorder/County Clerk form, headed Request for Change of Address on Real Property, that an owner or authorized agent uses to give the Assessor a new mailing address for property taxes and assessment information.
The form is issued by the Assessment Services Division of the San Diego County Assessor/Recorder/County Clerk (Assessor), at 1600 Pacific Highway, Suite 103, San Diego, CA 92101. It is a one-page request. It lists up to five parcel numbers, each with its property address, then asks for the owner's name as it appears on title, the new mailing address on up to four address lines, the status of the property (Still Occupy, Sold or Rental) with a Date Moved Out, and the owner's signature, date and phone number.
It is a change-of-address request only. The Assessor's forms page lists separate change-of-address forms for Business Personal Property and for Vessels & Aircraft, so this form is the one for real property, residential or commercial. The form carries the code AC9 and the revision date Rev 10/24.
Who needs to file AC9?
Owners of real property in San Diego County who want the Assessor to send property tax and assessment information to a new mailing address use this form. It applies to residential and commercial real property alike, as the title states.
An authorized agent may complete it for the owner. The form says that by typing in your name you certify that you are the owner of the property or an authorized agent.
- Use one form for up to five parcels; each parcel has its own line for the parcel number and the property address.
- Enter the owner's name as it appears on title.
- Mark whether you still occupy the property, have sold it, or rent it, and give the date moved out where it applies.
Do not use this form for business personal property or for vessels and aircraft. The Assessor publishes separate change-of-address forms for those, listed on its forms page.
When to file AC9
Submit the form when the mailing address for your property taxes and assessment information changes, for example after you move out of a property, sell it or begin renting it. The form prints no deadline or filing window of its own, and it is not tied to an annual cycle.
The form asks for the date you moved out, so have that date ready if the status you mark is Sold, Rental or another move. For questions about timing, call the Assessment Services Division at 619/236-3771 (Option 1).
How to fill out AC9
Enter the parcel numbers
Under PARCEL NUMBER(S)*, enter the parcel number for each property on Parcel Number (1) through Parcel Number (5), in the format shown by the dashes on the form. Use one line per parcel.
Add each property address
Next to each parcel number, write the Property Address of that parcel. Leave unused parcel lines blank.
Print the owner's name
In PRINT OWNER'S NAME (AS ON TITLE)*, enter the owner's name exactly as it appears on title.
Write the new mailing address
In NEW MAILING ADDRESS*, fill Address Line 1 through Address Line 4 with the address where you want property tax and assessment information sent. Use only the lines you need.
Mark the property status
Choose Still Occupy, Sold or Rental to show what applies to the property, and enter the date in Date Moved Out when it applies.
Sign, date and add a phone number
Complete Owner's Signature*, Date* and Phone Number*. By typing in your name, you certify that you are the owner of the property or an authorized agent.
Review and download the completed PDF
Check that every asterisked field is filled and the parcel numbers match their addresses. Download or print the completed PDF from FillingPDF and send it as described under How to submit.
How to submit AC9
The form instructions say to fill in the parcel information, sign, and email or mail the form to the address listed at the top of the form.
- Email: [email protected]
- Mail: San Diego County Assessor/Recorder/County Clerk, Assessment Services Division, 1600 Pacific Highway, Suite 103, San Diego, CA 92101.
Before you send it, check that every field marked with an asterisk is complete: parcel number, owner's name, new mailing address, signature, date and phone number. The form lists no fee and names no other submission channel. For questions, call 619/236-3771 (Option 1) or see www.sdarcc.gov. FillingPDF lets you fill out and download the PDF; submission follows the Assessor's channels above.
Common mistakes to avoid
- Leaving a required field blank: the form marks the parcel number(s), owner's name, new mailing address, signature, date and phone number with an asterisk.
- Writing the owner's name differently from the title; the form asks for the name as on title.
- Sending the form unsigned or without the date and phone number next to the owner's signature.
- Using this form for business personal property, vessels or aircraft, which have separate change-of-address forms on the Assessor's forms page.
- Listing a property address without its parcel number, or mixing up which address belongs to which parcel when several parcels are listed.
- Not marking the status of the property (Still Occupy, Sold or Rental) or omitting the date moved out when it applies.
- Sending the form somewhere other than the email or mailing address printed at the top of the form.
Frequently asked questions
What is the San Diego County change of address form for real property?
It is form AC9, Request for Change of Address on Real Property, issued by the San Diego County Assessor/Recorder/County Clerk. You use it to give the Assessor a new mailing address for your property taxes and assessment information on residential or commercial real property.
Can I email the change of address form to the Assessor?
Yes. The form instructions say to fill in the parcel information, sign and email or mail the form to the address listed on it. The email address printed on the form is [email protected].
Where do I mail the real property change of address form?
Mail it to the San Diego County Assessor/Recorder/County Clerk, Assessment Services Division, 1600 Pacific Highway, Suite 103, San Diego, CA 92101. You can call 619/236-3771 (Option 1) with questions.
How many parcels can I list on one AC9 form?
Up to five. The form has lines for Parcel Number (1) through Parcel Number (5), each with a line for the property address. The form does not say what to do with more than five parcels, so ask the Assessment Services Division.
Who can sign the change of address request?
The property owner or an authorized agent. The form states that by typing in your name you certify that you are the owner of the property or an authorized agent. Signature, date and phone number are all required.
Does this form also change my business personal property or vessel address?
No. This form covers real property. The Assessor's forms page lists separate forms, Change of Address - Business Personal Property and Change of Address - Vessels & Aircraft, for those property types.
Can I fill out the AC9 change of address form online?
You can fill out the PDF online on FillingPDF and download or print it. FillingPDF is an independent service and does not send the form to the Assessor; you email or mail it through the channels printed on the form.
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