How can I check my assessed value?

Check the assessment notice mailed by the county assessor and request information or an informal review from the assessor's office.

How do I appeal an assessment?

Start with the assessor's informal review process, then file a formal application with the county Assessment Appeals Board if unresolved.

Who enforces payment and penalties?

The county Treasurer-Tax Collector enforces tax payment and assesses penalties or collection steps; contact that office for payment questions.

San Diego Property Tax Assessment Guide

Taxation and Finance California 3 Minutes Read · published February 05, 2026

This guide explains the property tax assessment process for homeowners in San Diego, California, including how assessed values are set, review and appeal routes, who enforces assessment and payment rules, and practical steps to act. It is focused on the county-administered assessment system that affects property taxes in the City of San Diego.

How assessments work

In San Diego County, assessed value is determined under California rules that set a base year and allow annual adjustments for new construction or changes of ownership. Assessments originate at the county assessor's office, which maintains roll values and issues notices of assessed value to property owners.

Review your annual assessment notice as soon as you receive it.
Check the facts that affect valuation: sale comparables, square footage, and permitted improvements.
Keep records of purchases, permits, and repair work that may affect value or justify adjustments.

Assessed values are set and maintained by the county assessor.

When to review or challenge an assessment

Owners should review their assessment notice each year. If you believe the assessed value is incorrect, the usual remedy is an appeal to the county Assessment Appeals Board or the formal review process provided by the assessor's office.

Act promptly: follow the filing windows printed on your assessment notice or provided by the assessor.
Prepare evidence: recent comparable sales, appraisal reports, and records of repairs or damage.

Penalties & Enforcement

Assessment decisions affect tax bills and payment obligations. Enforcement of tax payment and penalties is administered by the county Treasurer-Tax Collector; assessment disputes are adjudicated by the county Assessment Appeals Board or equivalent hearing body.

Fine amounts and monetary penalties: not specified on the cited page.
Escalation for repeat or continuing nonpayment: not specified on the cited page.
Non-monetary sanctions: collection actions, tax liens, and possible sale procedures may be used by tax collection authorities; exact remedies are not specified on the cited page.
Enforcer and contact pathway: county Treasurer-Tax Collector handles tax collection and penalties; the county assessor handles valuation and notices; appeals are heard by the county Assessment Appeals Board.
Appeal and review routes: file with the county Assessment Appeals Board or follow the assessor's review/appeal instructions; specific filing deadlines and time limits are not specified on the cited page.
Defences and discretion: administrative review, proof of incorrect valuation, and requests for relief based on clerical error or exemptions are typical; specific statutory defenses are not specified on the cited page.

Applications & Forms

The county assessor and the Assessment Appeals Board publish any required forms for administrative review and formal appeals. Where the specific form name or number is not published on the cited page, it is not specified on the cited page.

Action steps for homeowners

Obtain and review your assessment notice when mailed or posted by the county assessor.
Gather evidence: sales comparables, inspection reports, and permits.
Contact the assessor's office for an informal review before filing a formal appeal.
File appeals within the statutory filing window indicated by the county; check the assessor or appeals board for the exact dates.
Pay taxes on time to avoid collection penalties while pursuing appeals; follow instructions from the Treasurer-Tax Collector for payments or to request relief if eligible.

FAQ

How can I check my assessed value?: Check the assessment notice mailed by the county assessor and request information or an informal review from the assessor's office.
How do I appeal an assessment?: Start with the assessor's informal review process, then file a formal application with the county Assessment Appeals Board if unresolved.
Who enforces payment and penalties?: The county Treasurer-Tax Collector enforces tax payment and assesses penalties or collection steps; contact that office for payment questions.

How-To

Obtain your latest assessment notice from the county assessor or your property records portal.
Compare the assessed value to recent comparable sales and note any factual errors.
Contact the assessor's office for an informal review; provide evidence such as comparables or appraisals.
If the issue is unresolved, obtain and submit the formal appeal application to the county Assessment Appeals Board before the filing deadline.
Continue to pay required taxes or follow the Treasurer-Tax Collector procedures to avoid penalties while your appeal is pending.

Key Takeaways

Assessments are administered by the county assessor; review notices annually.
Use the assessor's informal review before pursuing a formal appeal to the Assessment Appeals Board.