San Francisco Property Tax Appeal: A Step-by-Step Guide for Homeowners
Your San Francisco property tax bill is based on what the Assessor says your home is worth, not what a buyer would actually pay for it today. When those two numbers diverge, you're overpaying.
A property tax appeal lets you challenge that assessed value and, if successful, get a refund plus a lower bill going forward. This guide walks through the deadlines, filing steps, evidence that wins, and mistakes that get appeals denied.
What a San Francisco Property Tax Appeal Actually Is
A property tax appeal is a formal request to lower the assessed value of your home, which directly reduces your annual tax bill. In San Francisco, homeowners can challenge their assessment when they believe the Assessor-Recorder's Office has valued their property higher than what it could actually sell for today.
California's Proposition 13 and Proposition 8 create the framework. Prop 13 caps how much your assessed value can increase each year — 2% maximum — while Prop 8 allows temporary reductions when market values drop below that capped amount.
A few terms worth knowing before you file:
- Assessed value: The dollar amount the Assessor assigns to your property, which determines your tax bill
- Base year value: The value set when you bought the home, adjusted upward by no more than 2% annually under Prop 13
- Decline-in-value reduction: A temporary reduction under Prop 8 when your home's current market value falls below the adjusted base year value
The key distinction is between what the Assessor says your home is worth and what a buyer would actually pay for it right now. Your appeal focuses on proving that gap exists. Importantly, Prop 8 reductions are not automatic — the homeowner has to request them.
Why San Francisco Property Tax Appeals Are Surging
Appeals tend to spike when real estate values drop but assessed values stay flat or keep climbing. San Francisco has seen this pattern dramatically in recent years. In fiscal year 2024/2025, the Assessment Appeals Board received 9,281 applications — surpassing even the Great Recession peak of 6,620 in 2009. The SF Standard reports the Assessor-Recorder is now under pressure to process appeals within a two-year deadline or be forced to automatically accept taxpayers' opinions of value — a dynamic that has created both opportunity and urgency for homeowners.
Under California law, you pay taxes on the lower of your home's market value or its Prop 13 base year value. When the market dips below your base year value, you're entitled to a temporary reduction. Many homeowners don't realize this and keep paying taxes on an inflated figure.
Informal Assessment Review vs. Formal Appeal
San Francisco offers two paths to challenge your assessment. The right choice depends on your property type and how much time you have.
| Factor | Informal Review | Formal Appeal |
|---|---|---|
| Who handles it | Assessor-Recorder's Office | Assessment Appeals Board |
| Eligible properties | Single-family residential only (not TICs) | All property types |
| Filing window | January 2 through March 31 | July 2 through September 15 |
| Filing fee | None | $120 (non-refundable) |
| Outcome | Non-binding recommendation | Legally binding decision |
There is very little downside to filing an informal review — it's a completely free online form, and if the Assessor disagrees with your appeal, your assessed value just stays the same. Note that TIC properties are not eligible for the informal review and must use the formal appeal path. For multi-family or commercial properties, the formal appeal is also the only option from the start.
San Francisco Property Tax Appeal Deadlines and Filing Fees
Missing the deadline forfeits your right to appeal for that entire tax year. Per the Assessment Appeals Board:
- Informal review: January 2 through March 31 (single-family residential only)
- Formal appeal — regular assessment: July 2 through September 15
- Supplemental, Escape, or Roll Correction assessments: Within 60 days of the notice or tax bill
No extensions of time are available to file assessment appeals in California. The filing fee for a formal appeal is $120 per application, with a $3 online convenience fee. The fee is non-refundable. You can file online, by mail, or in person at City Hall, Room 405, 1 Dr. Carlton B. Goodlett Place.
How to File a San Francisco Property Tax Appeal
Step 1. Review Your Notice of Assessed Value
Your annual assessment notice arrives in the mail and shows the Assessor's opinion of your property's value as of January 1 (the lien date). You can also verify your current enrolled value using the San Francisco Assessor-Recorder Community Portal. Compare this number to recent sales of similar homes in your neighborhood. If comparable properties sold for less than your assessed value, you likely have grounds for an appeal.
Step 2. Request an Informal Assessment Review (Single-Family Homes)
For eligible properties, consider starting with the free informal review through the Assessor-Recorder's Office, open January 2 through March 31. You submit evidence showing why the assessed value is too high, and the Assessor's appraisal staff reviews your comparable sales and market data, estimates the property's market value as of January 1, and compares that to your current base year value. If the January 1 market value is below the factored base year value, the assessed value will be lowered for the next fiscal year. Results appear in the Notice of Assessed Value mailed at the end of July. If the Assessor doesn't agree, you haven't lost anything and can still file a formal appeal.
Step 3. File Form BOE-305-AH with the Assessment Appeals Board
If the informal review doesn't resolve your case — or you own a TIC, multi-family, or commercial property — file the Application for Changed Assessment (Form BOE-305-AH) with the Assessment Appeals Board. You'll need your property address, Assessor's Parcel Number (APN), the Assessor's enrolled value, and your opinion of the correct value. Submit by mail, in person at City Hall Room 405, or through the Board's online portal. Keep a copy of everything.
Step 4. Choose Your Hearing Type
Many owner-occupied homes and 1-4 unit residential properties qualify for the Hearing Officer Program — a one-commissioner hearing with no additional hearing fee. If you do not request a Hearing Officer, you'll be scheduled before a three-member Board panel, where additional hearing fees apply.
Step 5. Prepare Your Evidence Packet
Step 6. Request an Exchange of Information
You may request a formal Exchange of Information before your hearing. Initiate the request at least 30 days before the hearing date; the Assessor must respond at least 15 days before the hearing with their opinion of value and supporting data. Knowing what the Assessor will argue lets you prepare a focused rebuttal.
Step 7. Attend Your Assessment Appeals Board Hearing
Hearings take place at City Hall. You or an authorized representative must appear — failure to appear results in automatic denial. The Board can leave the value the same, decrease it, or increase it. Most hearings last 15–30 minutes. Bring enough copies of your evidence for all Board members and the Assessor's representative.
Evidence That Wins a Decline-in-Value Appeal
The Board weighs objective market data over opinions. Your job is to prove that your home's market value on January 1 was lower than the assessed value.
Recent Comparable Sales
Comparable sales are the foundation of most successful appeals. Look for homes that sold within 90 days of the January 1 lien date, in your neighborhood, with similar square footage, bedroom count, and condition. Many appeals fail simply because the comps are bad and the argument is poorly presented. The closer the match to your property's characteristics, the stronger your case.
Independent Appraisal Reports
A professional appraisal from a licensed appraiser carries weight, though it's optional. The Assessor-Recorder's Office accepts sales information and/or an appraisal performed by a licensed real estate appraiser as supporting evidence. Consider one if your property is unusual, if comps are scarce, or if the potential savings justify the cost.
Photos of Property Condition and Defects
Deferred maintenance, foundation issues, outdated systems, or other defects can support a lower value. Bring dated photos showing the condition as of the lien date. The Board understands that a home needing significant repairs isn't worth the same as a turnkey property down the street.
Rental Income and Vacancy Data for Investment Properties
For rental properties, the income approach to value applies. Below-market rents, high vacancy rates, or rent-controlled units can all support a reduced assessment. Bring rent rolls, lease agreements, and vacancy records.
What Happens After You Win
A successful appeal results in a corrected assessment and a refund of any overpaid taxes, typically arriving within a few months of the decision. Keep in mind that Prop 8 reductions are temporary and only apply to the tax year being appealed. Any reduction is automatically reviewed annually to determine whether market conditions indicate the value should be maintained, lowered further, or restored. Monitor your assessment each year and file again if the market remains soft relative to your enrolled value.
Common Mistakes That Get San Francisco Property Tax Appeals Denied
Missing the September 15 filing deadline. No extensions are available. Even one day late means waiting another full year. Set a calendar reminder for early September.
Submitting comps that sold outside the valuation window. The California State Board of Equalization notes that comparable sales more than 90 days after the lien date are not admissible at a formal hearing. A sale from six months after January 1 reflects a different market and will be dismissed.
Confusing base year value with current market value. Prop 8 appeals address market value declines below your Prop 13 base year value — not disagreements with your original purchase price. If you think your base year value was set incorrectly at purchase, that's a different type of appeal with different rules.
Skipping the hearing. Failure to appear results in automatic denial. If you have a scheduling conflict, request a continuance in writing before your hearing date.
Filing the same year's appeal again and expecting it to carry forward. Each year's assessment is independent, based on the property's value as of January 1 of that year. A reduction for one year does not automatically apply to future years.
Have Questions About Your Property's Value?
Understanding your property's true market value — and whether your assessment accurately reflects it — is something I can help with as part of the buying or ownership process. If you're working through an appeal, have questions about how your assessed value was set, or are thinking about a purchase in San Francisco and want to understand the tax implications, let's talk.
Frequently Asked Questions About San Francisco Property Tax Appeals
Can I appeal a supplemental or escape assessment in San Francisco?
Yes. Supplemental and escape assessment appeals are accepted within 60 days of the date on your notice or tax bill, regardless of whether the regular appeal window is open. Check the date on your supplemental bill carefully.
Will the San Francisco Assessor raise my property value if I file an appeal?
The Assessment Appeals Board is required by law to determine the value of your property, which means it can leave the value the same, decrease it, or increase it. In practice, the Board rarely increases values in a decline-in-value appeal where the evidence supports the homeowner's position. Filing a well-supported case carries minimal risk.
Is it worth hiring a property tax consultant or attorney?
Professional representation can help for complex cases or high-value properties. Most single-family homeowners handle the informal review themselves — the process is straightforward and free. Consultants typically charge a percentage of the savings, which can make sense on larger properties.
Can I appeal property taxes on a rental or investment property?
Yes. The Assessment Appeals Board accepts formal appeals for all property types, including multi-family, commercial, and investment properties. Rental and multi-unit properties use the formal appeal path only — they are not eligible for the informal review.
How long does a San Francisco property tax appeal take?
The Assessment Appeals Board has up to two years from timely filing to schedule, hear, and render a decision. Given the current backlog of over 9,000 appeals, timelines are extended — which is why filing early in the July–September window often means a faster resolution.
Caley Zheng is a San Francisco real estate agent specializing in buyer representation across the city's most competitive neighborhoods. She has access to pre-market and off market listings through the Top Agent Network, the Side brokerage network, and a trusted network of agent relationships across San Francisco.
