County filing guide
How to appeal your property tax in Solano County
Regular decline-in-value appeals. Supplemental and escape assessments have different deadlines.
Filing options
Filing instructions
Informal review by mail
The 2026 request period is July 1, 2026–November 30, 2026. Use the Assessor's 2026-27 form for the January 1, 2026 value.
Open the county's Assessment Review Request (Prop 8) page and download the Assessment Review Request for a Decline in Property Value form.
Download the 2026–27 informal review form. Enter the parcel number from your tax bill, owner name, phone, email and property address. Select the property type. Complete the agent details and attach authorization only if someone is filing for the owner.
Review the information, then sign and date the request. For commercial, industrial or other property types, attach support for the January 1 valuation as instructed on the form. For a residential request, the form does not require a comparable-sales worksheet; have your supporting information ready if the Assessor asks for it.
Keep a copy and mail the signed form to Solano County Assessor/Recorder, 675 Texas Street, Suite 2700, Fairfield, CA 94533-6338. The request must be postmarked by November 30, 2026. Retain proof of mailing.
The Assessor will notify you of the result. If you still disagree or the review is unresolved as the formal deadline approaches, file a separate formal appeal by that deadline. The informal request does not replace that application.
Formal appeal by mail
The regular annual appeal window is July 2, 2026–November 30, 2026. The filing fee is $35 per parcel, nonrefundable.
Open the Clerk's Assessment Appeals page and select Assessment Appeal Application. The county's archival-document page displays the application PDF. Download it and read its instructions; the currently linked PDF is also available directly.
Open the formal assessment appeal application. Use a separate application for each parcel and tax year. Enter your contact information, property identification, assessed value and your opinion of the January 1 value. Explain the facts supporting the requested reduction. For an ordinary annual market-value dispute, use the regular-assessment, decline-in-value category.
Complete any remaining application questions following the county's instructions, then review, sign in blue pen with an original signature and date it. Do not attach hearing evidence. If using an agent, use the Agent Authorization Form linked on the appeals page; the Assessor's separate authorization form is not accepted for formal appeals.
Keep a copy of the application and enclose a $35 check or money order payable to Solano County. Mail the packet to Clerk of the Board, 675 Texas Street, Suite 6500, Fairfield, CA 94533.
Ensure the packet receives a USPS postmark by November 30, 2026, and keep proof of mailing. Send it early: the county warns that the postmark can reflect processing at a postal facility rather than the day you put it in the mail.
Keep your application number and county correspondence. When the hearing notice arrives, return its confirmation card by the stated date. The county asks for seven copies of hearing exhibits. Continue paying property taxes by their normal due dates.
After you file
Informal review
Keep your request confirmation and any correspondence from the Assessor. Check the formal appeal deadline above when considering a separate appeal.
Formal appeal
Keep a copy of your application and filing confirmation. Watch for notices from the Clerk of the Board and follow the county’s instructions for any hearing.
Open my appeal plans →Contacts & sources
Clerk of the Board
Runs the formal appeal
707-784-6100 · appeals page ↗
675 Texas Street, Suite 6500, Fairfield, CA 94533
This guide covers the regular decline-in-value appeal; supplemental or escape assessment notices follow different deadlines. Every date and fee here was checked against official sources, listed below with the date checked. If the county's page ever differs from this guide, follow the county's page.
Sources
Informal sources
- Assessment Review Request (Prop 8) and 2026–27 request form — checked September 29, 2026. The form covers the current January 1 assessment, gives the November 30, 2026 postmark deadline and mailing address, and requires a signature. No online submission channel was identified in the reviewed material.
- This guide describes an owner requesting review of a residential property's regular assessment. The county excludes prior tax years and supplemental assessments from this Prop 8 review. Questions: (707) 784-6210 or [email protected].
- The form-download entry and How it Works section were checked in the browser October 6, 2026; an annotated download screenshot is beneath informal Step 1. No request was submitted.
Informal review
- https://www.solanocounty.gov/government/assessorrecorder/assessor-division/property-tax-savings/assessment-review-request-decline-property-value-proposition-8 · “Available July 1 – November 30: The time for submitting requests for Proposition 8 reassessments/reviews and formal assessment appeals” (checked July 11, 2026)
Formal sources
- Assessment Appeals and Common Assessment Types and Filing Deadlines — checked September 29, 2026. Support the regular filing period, fee, payment recipient, USPS-postmark requirement, agent authorization and hearing follow-up.
- Currently linked local rules — the application provisions require signed paper filings, one application per parcel and year, and submission to Suite 6500. They expressly prohibit filing by email or fax.
- The Assessor page groups formal appeals under a July 1 heading, but the Clerk's dedicated deadline page and the informal request form identify July 2 as the formal start. This guide follows the Clerk.
- Currently linked county application, BOE-305-AH Rev. 12 (05-24) — downloaded and inspected October 6, 2026. Despite the 2025 filename, it is the form linked from the current Clerk's page. Confirms the $35-per-parcel fee, check/money-order payee, Suite 6500 address, form selections, original signature in blue pen and instruction not to attach hearing evidence. The archival-document page embeds the PDF directly; a View Document selection was not present. If the download fails, request the application from [email protected] or (707) 784-6100. An annotated application-link screenshot is beneath formal Step 1; later paper steps are document-backed.
- This guide covers regular annual decline-in-value appeals. Supplemental, escape and other notice-based appeals have separate deadlines.
Formal appeal window
- https://www.boe.ca.gov/proptaxes/pdf/lta26023.pdf · “The regular appeals filing period in each county will begin on July 2, 2026, and will end on September 15, 2026, for those counties where the Assessor mails assessment notices to all taxpayers with property on the secured roll by August 1, 2026. For counties where assessment notices are not mailed by August 1, 2026, the filing period is extended to November 30, 2026.” (checked July 10, 2026)
Filing fee
- https://www.solanocounty.gov/government/clerk-board/assessment-appeals · “Pay $35 non-refundable fee, per parcel for this service” (checked July 11, 2026)
Filing address
- https://www.solanocounty.gov/government/clerk-board · “Clerk of the Board 675 Texas Street, Fairfield, CA, USA Suite 6500 Fairfield, CA 94533” (checked July 11, 2026)
Filing channels
- https://content.solanocounty.gov/sites/default/files/2025-07/Assessment_Appeals_Application_2025.pdf · “Mail to: Solano County Board of Supervisors 675 Texas Street Suite 6500, Fairfield, CA 94533” (checked October 6, 2026)
Common questions about appealing in Solano County
When is the deadline to appeal in Solano County?
The deadline to file a formal appeal in Solano County for the 2026-27 tax year is November 30, 2026. Filing opened July 2, 2026.
The Assessor takes informal review requests from July 1 to November 30, 2026.
What does it cost to file an appeal in Solano County?
The county filing fee for a formal appeal is $35.
Informal review or formal appeal: which one first?
Solano County offers both: an informal review with the Assessor, and a formal appeal filed with the Clerk of the Board (due November 30, 2026).
The state's own guidance says to talk to the Assessor's office first: if their staff finds an error, they can lower the roll directly and you may never need to file. Missing an informal review costs you nothing; missing the formal deadline costs you the year.
Which form do I file, and where?
The formal appeal uses the state's application form, BOE-305-AH ↗.
Solano County accepts the formal appeal by mail.
Mail it to the Clerk of the Board at 675 Texas Street, Suite 6500, Fairfield, CA 94533.
Check the Clerk of the Board's appeals page ↗ or call 707-784-6100 before you file.
How long does an appeal take?
You get written notice at least 45 days ahead, hearings are open to the public (you can watch one first), and boards are expected to decide within two years of filing. You can still settle at any point before your date.
Do homeowners actually get their assessments lowered?
3,100 homes in Solano County had temporarily reduced assessments in tax year 2025-26.