California Property Tax Appeals: Deadlines, Prop 13 & Exemptions

How California Property Tax Appeals Work

In California, a property tax appeal is filed as an Assessment Appeal Application — currently BOE Form 305-AH — with the Clerk of the Board in the county where your property sits. It's heard by your county's assessment appeals board (in smaller counties, the board of supervisors sits in this role instead), which functions as a local board of equalization independent of the county assessor's office. The California State Board of Equalization notes that an appeals board's decisions are "legally binding and enforceable." boe.ca.gov/proptaxes/asmappeal.htm

The Deadline Rule: July 2 – September 15, Extended to November 30 in Some Counties

California's filing window is set by state law, not by each county individually, but which window applies to you depends on when your county assessor mails value notices. Under Revenue and Taxation Code § 1603, the regular filing period runs from July 2 through September 15, inclusive. However, if your county assessor does not mail a value notice to every real property owner on the secured roll by August 1, the deadline is extended to November 30 for affected property owners in that county. leginfo.legislature.ca.gov, R&TC § 1603

Because this depends on each county's own mailing practices, the practical deadline — September 15 or November 30 — varies from county to county even though the underlying rule is statewide. Confirm which window your county is operating under before you file.

How Your Value Is Assessed — and Proposition 13's Cap

California's assessment system is built around Proposition 13, which the State Board of Equalization describes as having, in most cases, "limited future property tax increases to a maximum of 2 percent per year" on a property's assessed value, regardless of how much market value rises in a given year. A property's assessed value is generally set at its purchase price (its "base year value") and then adjusted upward by no more than 2% annually until it changes ownership or undergoes new construction, at which point it's reassessed at current market value. If your property's market value drops below its Prop 13-capped assessed value, you may qualify for a temporary decline-in-value (Proposition 8) reduction, which can rise or fall year to year but is not itself subject to the 2% cap. boe.ca.gov/proptaxes/decline-in-value

Exemptions Worth Knowing

Homeowners' Exemption: reduces the taxable value of an owner-occupied principal residence by $7,000. You must own and occupy the home as your principal residence as of the January 1 lien date, and file once with your county assessor using Form BOE-266. First-time claimants should file no later than February 15 to receive the full exemption for that year; December 10 is the last day to notify the assessor if you no longer qualify without penalty. boe.ca.gov/proptaxes/homeowners_exemption.htm

Disabled Veterans' Exemption: available in two tiers. The basic exemption (referred to as the "$100,000 exemption," adjusted annually for inflation) is open to all qualifying claimants. The low-income exemption (referred to as the "$150,000 exemption," also adjusted annually) is available to claimants whose household income falls under a specified limit. Eligibility requires a 100% VA disability rating (or status as the unmarried surviving spouse of a qualifying veteran), the property being your principal residence, and discharge under other than dishonorable conditions. For an initial claim to receive the full exemption, you must file between the date of the qualifying event and the following January 1, or within 90 days of that event, whichever is later; the low-income tier requires annual renewal between January 1 and February 15. boe.ca.gov/proptaxes/dv_exemption.htm

The Appeal Ladder Beyond the Assessment Appeals Board

An assessment appeals board's decision is binding, but it isn't necessarily the final word. To pursue further relief, state law generally requires a taxpayer to have already filed a claim for refund before bringing an action in superior court — California's Revenue and Taxation Code specifies that "no action shall be commenced or maintained" on a refund claim unless a claim for refund was first filed. leginfo.legislature.ca.gov, R&TC § 5142

What Evidence Actually Persuades an Appeals Board

Because California appeals typically turn on market value at the relevant valuation date, the strongest applications bring:

• Recent comparable sales of similar properties, adjusted for size, age, condition, and location.
• An independent fee appraisal, where one is available.
• Photographs and documentation of any condition issues not reflected in the assessor's records.
• For decline-in-value claims, evidence that current market value has fallen below the property's Prop-13-adjusted assessed value.

Every County Runs Its Own Calendar

The July 2–September 15 filing window (or November 30 in counties with late notices), Prop 13's 2% cap, and the statewide exemption programs above apply everywhere in California, but each county's assessor mailing dates, appeals board hearing schedules, and local procedures differ. See your county's Grove Hopper guide for the specific dates and contacts that apply where your property is located.