1. What Property Tax Issue Does Your Assessment Notice Raise?
For locally assessed real property in California, separate an overstated value from an incorrect reassessment trigger. Review the notice, parcel number, tax year, and valuation date before choosing a challenge.
Decline in Value Versus a New Base Year Value
Proposition 13 generally limits annual inflation adjustments to the base year value to two percent. Proposition 8 permits a temporary reduction when January 1 market value falls below that adjusted value. A change in ownership or completed new construction can instead establish a new base year value for the affected property. A temporary reduction does not permanently reset the tax base. As market value recovers, the assessment can increase by more than two percent, up to the applicable factored base year value.
Transfers, Trusts, and Construction
Review deeds, beneficial ownership, entity interests, and exclusions to determine whether a transfer warrants reassessment. For transfers on or after February 16, 2021, Proposition 19 limits the intergenerational exclusion to qualifying family homes and farms. Family-home claims require review of principal-residence use, value limits, and filing requirements. During trust administration, trust ownership alone does not establish an exclusion. For construction, ordinary maintenance differs from assessable additions or major rehabilitation, and the scope of reassessment matters.
2. Building Evidence for an Assessment Challenge
Evidence must support the requested assessment on the relevant date. An attorney evaluates the grounds, coordinates appraisal work, responds to the assessor, and prepares exhibits and witnesses.
Match the Records to the Issue
Use records that explain the disputed value or reassessment.
| Issue | Useful Records | What They Address |
|---|---|---|
| Residential overvaluation | Comparable sales, appraisal, condition photographs | Market value on the relevant date |
| Income-producing property | Leases, rent rolls, vacancy and expense records | Support for valuation assumptions |
| Ownership reassessment | Deeds, trust provisions, entity ownership records | Transfer date, interests, and possible exclusions |
| Construction reassessment | Permits, plans, invoices, completion records | Assessable work, timing, and affected improvements |
Residential overvaluation
- Useful RecordsComparable sales, appraisal, condition photographs
- What They AddressMarket value on the relevant date
Income-producing property
- Useful RecordsLeases, rent rolls, vacancy and expense records
- What They AddressSupport for valuation assumptions
Ownership reassessment
- Useful RecordsDeeds, trust provisions, entity ownership records
- What They AddressTransfer date, interests, and possible exclusions
Construction reassessment
- Useful RecordsPermits, plans, invoices, completion records
- What They AddressAssessable work, timing, and affected improvements
Separate Transaction Documents from Valuation Proof
Records from real estate transactions establish what changed hands and when. Valuation evidence must address the assessment date. For rental property, an attorney and appraiser can test income and expense assumptions against the operating records.
3. County Appeals and Potential Refund Litigation
File the county-approved Assessment Appeal Application with the clerk of the board where the property is located. The county appeals board or board of supervisors acting as the local board of equalization hears qualifying challenges.
Identify the Filing Period before Negotiating
Regular assessment applications generally run from July 2 through September 15 or November 30, depending on the county, subject to applicable extensions. Supplemental and escape assessments commonly involve separate 60-day periods. Verify the triggering notice or bill, mailing or postmark date, and current county instructions. Weekend, holiday, and other statutory extensions may affect the final date. An informal assessor review does not replace a timely application or automatically extend its deadline.
Prepare for the Hearing and Any Further Challenge
Present evidence at the hearing even if previously sent to the assessor. Attorneys handle information exchanges, witnesses, valuation methods, and reassessment grounds. Before a refund lawsuit, an attorney must evaluate payment, administrative exhaustion, and refund-claim requirements. Check whether the appeal application also serves as a refund claim. A refund action generally belongs in Superior Court, with a separate filing deadline that depends on the claim's procedural status.
4. Practical Pitfalls during a Property Tax Dispute
Within broader property tax assessment services, appeals require attention to payment obligations, possible increases, and limits on the board’s authority.
Continue Payments and Assess the Risk of an Increase
A pending appeal does not suspend timely property tax payments. Late payment can produce penalties despite a successful challenge. The board may also maintain or increase the assessed value. The board cannot lower an assessment simply because the owner cannot afford the bill.
Keep Separate Issues on the Correct Track
A supplemental assessment concerns an assessable event and may require a separate application from an annual decline-in-value challenge. Missing its deadline can limit relief even if a later regular-roll appeal succeeds. Likewise, a reduction in assessed value does not necessarily eliminate fixed charges or special assessments appearing on the bill. Identify the disputed charge before selecting a remedy.
5. Frequently Asked Questions
Clarify the work, appraisal costs, and stages covered before hiring representation.
Fees depend on complexity, appraisal needs, and whether representation includes assessor discussions, a board hearing, or litigation. Ask for written terms identifying the billing method, expert costs, and whether later proceedings require a separate agreement. Compare projected costs with potential relief.
Owners may represent themselves in an assessment appeal. Legal assistance may be useful when ownership exclusions, entity transfers, contested construction, or potential litigation complicate the matter.
6. Discuss Your Assessment Notice and Available Options
Bring the notice and envelope, tax bills, prior assessments, and transfer, construction, or valuation records. Request a review of the deadline, grounds, missing evidence, and likely costs before choosing assessor discussions, a formal appeal, or a refund claim.
05 Nov, 2026
