California Commercial Property Tax Appeal Letter Generator

California commercial property owners often pay more in property taxes than the law actually requires. Under Proposition 13 and the California Revenue & Taxation Code, your assessed value should reflect either your purchase price (with a maximum 2% annual inflation adjustment) or the property's fair market value if it has declined. When the County Assessor sets a value that's too high, you have a limited window to challenge it through a formal appeal to the county Assessment Appeals Board. A well-drafted demand letter or Application for Changed Assessment can save commercial owners thousands per year. California's deadlines are strict and unforgiving—miss them, and you typically wait until the next tax year. This page explains how California assessment law works and how to prepare a strong appeal.

California property tax assessment is governed primarily by Article XIII A of the California Constitution (Proposition 13) and Revenue & Taxation Code §§ 50-100 and 1601-1647. For commercial property, the assessed value is generally the property's base year value (purchase price) adjusted upward by no more than 2% per year, unless there is a change in ownership or new construction. When a triggering event occurs, the assessor establishes a new base year value at full market value as of the date of the event under Rev. & Tax Code § 110.

Commercial owners have two principal grounds for appeal. First, a 'base year value' appeal under Rev. & Tax Code § 80 challenges the assessor's determination of value following a change in ownership or new construction. This must generally be filed within four years. Second, a 'decline in value' appeal under Rev. & Tax Code § 51(a)(2) (commonly called a Prop 8 appeal) argues that the property's current market value is lower than its factored base year value as of the January 1 lien date. Prop 8 reductions are temporary and reviewed annually.

For income-producing commercial property, assessors and appeals boards typically consider all three valuation approaches: the cost approach, the sales comparison approach, and the income approach. The income approach—capitalizing net operating income—is often the most persuasive for office buildings, retail centers, hotels, and industrial properties. Rev. & Tax Code § 469 specifically authorizes audits and value adjustments for trade fixtures and business personal property. The taxpayer bears the burden of proving the assessor's value is incorrect, except in owner-occupied single-family cases. Successful appellants are entitled to a refund plus statutory interest under § 5151.

A pre-appeal demand letter to the County Assessor can sometimes resolve disputes without a formal Assessment Appeals Board hearing. The letter should be addressed to the County Assessor's office with a copy to the Clerk of the Board. Open by identifying the property by Assessor's Parcel Number (APN), the tax year at issue, and the enrolled value you are challenging.

Next, state the legal basis clearly: a base-year-value challenge under § 80, a decline-in-value claim under § 51, an escape assessment dispute under § 531, or a calamity reassessment under § 170. Support your position with specific evidence: a recent appraisal, comparable sales data, market rent surveys, capitalization rate analysis, vacancy data, and operating statements. For income properties, attach a pro forma showing net operating income and an appropriate cap rate derived from market data.

Request a specific remedy—a stipulated reduction to a stated value, a refund of overpaid taxes for prior years if applicable, and confirmation in writing. Reference Rev. & Tax Code § 1603 and note your intent to file a formal Application for Changed Assessment (Form BOE-305-AH) with the Assessment Appeals Board if the matter is not resolved before the filing deadline. Many counties have informal 'Assessor review' or 'Decline-in-Value Review' programs that run parallel to the formal appeal process; mentioning your willingness to use these can encourage settlement. Keep the tone professional, factual, and grounded in valuation evidence rather than complaint. Always preserve your formal appeal rights by filing the BOE-305-AH on time, even while negotiating.

Formal appeals are filed with the county Assessment Appeals Board (or Board of Equalization in smaller counties) using Form BOE-305-AH. Filing deadlines are July 2 through September 15 in counties that mail assessment notices by August 1 (Los Angeles, Orange, and others), or July 2 through November 30 in remaining counties. Supplemental and escape assessment appeals must be filed within 60 days of the notice. Filing fees vary by county—often $30 to $50 per parcel, with some counties charging more for high-value commercial parcels. The Board must hear the appeal within two years under Rev. & Tax Code § 1604, or the applicant's opinion of value becomes the temporary roll value. After exhausting administrative remedies, taxpayers may file a refund action in California Superior Court under Rev. & Tax Code § 5140.