California Property Assessment

An Assessment is the process by which a county assessor determines the taxable value of real property for property tax purposes. In California, this valuation establishes the base upon which annual property taxes are calculated. The assessment process also assigns and identifies a property’s Assessor’s Parcel Number (APN), a unique numerical designation used by the county to track ownership, boundaries, and taxation records.

Legal Effect Under California Law

In California, property assessments are governed by Article XIII A of the California Constitution, commonly known as Proposition 13. Under Proposition 13:

• Real property is generally assessed at its base year value (typically the purchase price).
• Annual increases in assessed value are capped at 2% per year unless there is a change in ownership or new construction.
• Upon sale or qualifying transfer, the property is reassessed at current fair market value.

The assessed value directly determines the property tax owed, which is generally limited to 1% of assessed value, plus any voter-approved local assessments or bonds.

Assessor’s Parcel Number (APN)

Each property is assigned a unique APN by the County Assessor’s Office. The APN:

• Identifies the parcel for tax purposes
• Appears on tax bills and recorded documents
• Is used in legal descriptions and real estate transactions

The APN is not a substitute for the legal description but serves as an administrative reference number.

Types of Assessments

• Base Year Assessment: This is established when property changes ownership or is newly constructed.
• Supplemental Assessment: Issued when a reassessment occurs mid-year due to sale or construction, resulting in an additional tax bill.
• Escape Assessment: Applied when a property was previously under-assessed or omitted from the tax roll.
• Special Assessments: Additional charges for specific local improvements or services (e.g., street lighting districts, sewer improvements).

Assessment Appeals and Disputes

Property owners have the right to challenge their assessed value if they believe it exceeds fair market value. Common disputes include:

• Decline in Market Value: Property owners may file a temporary reduction request, known as a Prop 8 appeal, when market value declines.
• Change of Ownership: Disputes may arise over whether a transaction triggered reassessment.
• New Construction Valuation: Disagreements may arise regarding the value added by improvements.

Appeals must typically be filed with the county Assessment Appeals Board within strict deadlines.

Assessment vs Appraisal

While related, these concepts differ:

• Assessment – Conducted by the County Assessor for taxation purposes.
• Appraisal – Conducted by a licensed appraiser to determine market value for lending, probate, or litigation purposes.

An assessed value may differ significantly from market value due to Proposition 13 limitations on annual increases.

California Statutes Governing Assessments

Property tax assessments are governed by the following California statutes:

• California Constitution, Article XIII A (Proposition 13) – Governs the assessment of property value and caps on annual increases.
• California Revenue and Taxation Code §§ 51, 60–69 – Defines base year value and outlines when reassessment occurs due to changes in ownership or new construction.
• California Revenue and Taxation Code §§ 1601–1615 – Covers the assessment appeals process.

These laws define the valuation standards, reassessment triggers, and appeal rights available to property owners.

Real Estate and Financing Terms