Prop 8 review vs. a formal property tax appeal in San Francisco

The short answer

An informal decline-in-value review is handled by the Assessor-Recorder as a residential courtesy process. A formal appeal is filed with the independent Assessment Appeals Board. An informal request does not preserve the right to a formal hearing, so a homeowner considering either route should confirm the applicable City deadline.

How the two paths differ

Informal review

Use the Assessor's decline-in-value information for current residential eligibility, timing, and submission instructions. The Assessor reviews the request and reflects any change through its assessment process.

Formal Assessment Appeals Board application

File the City's application with the required fee and evidence. The Board schedules and decides the appeal process. The City's AAB instructions explain regular, supplemental, escape, and calamity filing windows.

Evidence

Both paths depend on support for the property's value. A property-specific screen and comparable-sales research can help organize that evidence, but neither substitutes for verifying facts or following the City's requirements.

Where Proposition 8 fits

Proposition 13 generally limits annual assessment increases after a base-year value is set. A decline-in-value review can apply when market value falls below the enrolled assessed value for a given year. A reduction under this type of review can be temporary, and future assessments depend on the City's current valuation and applicable law.

This is general educational information. A homeowner should use the official instructions and seek qualified advice when the facts require it.

A practical decision sequence

1. Identify the assessment notice and its type.
2. Check the City's current deadline for that notice.
3. Develop and verify a January 1 value opinion with comparable evidence.
4. Use the appropriate City process before its deadline.

Start a free property check, then review the 2026 formal-appeal guide before acting.