Property Tax Appeals in Solano County, California
Solano County's Assessment Appeals page states that applicants must pay a $35 non-refundable fee, per parcel, for this service, payable by check or money order to Solano County, when submitting the completed Assessment Appeal Application during the July 2 through November 30 filing period. The page notes that, effective December 24, 2025, USPS changed its postmark rules so the official postmark is based on the date of first automated processing at a USPS facility rather than the drop-off or retail acceptance date, which can affect a mailed filing's timeliness. The Clerk of the Board's office is at 675 Texas Street, Suite 6500, Fairfield, CA 94533. FairPath can organize an owner-managed comparison table, condition exhibits, official links, and a filing checklist. It does not file the application, select the owner's opinion of value, pay the fee, negotiate with the Assessor, or appear at the hearing.
Assessment context: Begin with the Assessor's parcel record and confirm whether the dispute concerns the January 1, 2026 lien-date value on the regular roll, a supplemental assessment tied to a change of ownership or new construction, or a roll change, escape, or penalty assessment. Solano County combines the urbanized Vallejo, Fairfield, and Vacaville corridor along Interstate 80, the Benicia waterfront, and unincorporated agricultural and Delta-adjacent land toward Rio Vista and Dixon. A Delta-adjacent parcel a few miles from a subdivision lot is not automatically comparable. Zoning, agricultural use, flood-zone status, and site access should be confirmed against the Assessor's record rather than assumed from a map.
Filing process: Confirm ownership of the property, check the assessed value on the Assessor's website, and review the Assessment Appeal Application instructions and sample application before filing. Identify the correct appeal type among Regular Assessment, Supplemental Assessment, or Roll Change/Escape Assessment/Penalty Assessment, since each carries its own filing deadline. Submit the completed Assessment Appeal Application to the Clerk of the Board with the $35 non-refundable fee per parcel, payable by check or money order to Solano County. If using a representative, an Agent Authorization Form is required, and the page cautions not to attach the Assessor's separate Authorized Agent form, or the application will not be accepted. Property taxes remain due while the appeal is pending, and the county states an approximate 10-12 month wait time for a hearing, with a Hearing Notice sent about 45 days before the hearing date.
Evidence to review: Solano County's process calls for providing seven copies of exhibits at the hearing and allows an Exchange of Information Form with the Assessor, through which the Appeals Board considers whether the assessed value should be decreased, left unchanged, or increased. A written Findings of Facts summary is available. Build a comparable-sales table showing sale date, price, parcel, community, lot size, living area, age, and condition, and prioritize sales close to the January 1, 2026 lien date; California generally excludes comparable sales occurring more than 90 days after that date. For Delta-adjacent or agricultural parcels, document flood-zone status, water access, and any physical limitations with dated photographs or inspection findings.
Current deadline guidance: 2026 regular assessment appeals: July 2 through November 30, 2026. Solano County's Assessment Appeals page states applicants must submit the completed Assessment Appeal Application during the filing period from July 2 through November 30, consistent with the California State Board of Equalization's certified county filing-period table; if November 30 falls on a Saturday, Sunday, or legal holiday, the deadline extends to the next business day. Supplemental and escape assessments instead run on a notice-specific 60-day clock from the mailing or postmark date on the notice, whichever is later.
Solano County's 2026 regular filing period runs July 2 through November 30, matching the state's extended deadline group.
The Clerk of the Board charges a $35 non-refundable fee per parcel for this service, payable by check or money order to Solano County.
Solano County notes a December 24, 2025 USPS postmark rule change that can affect whether a mailed application is treated as timely.
The county states an approximate 10-12 month wait time for a hearing, with a Hearing Notice sent about 45 days beforehand and a required confirmation card.
Official filing authority: Solano County Clerk of the Board. https://www.solanocounty.gov/government/clerk-board/assessment-appeals
Source: Solano County Clerk of the Board, Assessment Appeals, https://www.solanocounty.gov/government/clerk-board/assessment-appeals. Reviewed 2026-09-22.
Source: Solano County, Clerk of the Board, https://www.solanocounty.gov/government/clerk-board. Reviewed 2026-09-22.
Source: California State Board of Equalization, Letter to Assessors 2026/023: 2026 Assessment Appeal Filing Periods, https://boe.ca.gov/proptaxes/pdf/lta26023.pdf. Reviewed 2026-09-22.
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