San Francisco Property Tax Appeal (2026 Guide)

Last updated August 25, 2026

A San Francisco property tax appeal challenges the assessed value of your home as of the January 1 lien date. File a free informal decline-in-value review with the Assessor-Recorder between January 2 and March 31 if you qualify, or a formal application with the Assessment Appeals Board from July 2 through September 15. The 2026/2027 window closes Tuesday, September 15, 2026. You prove value with comparable sales, not a listing-site estimate.

That is the local process in one breath. The rest of this page is the San Francisco-specific calendar, fees, evidence rules, and honest limits — not a national overview. AppealKit is a flat-fee tool that helps you build a hearing-ready packet yourself. It is not a law firm, it does not take a percentage of savings, and this is not legal or tax advice. Every hard number below links to a source we retrieved.

When is the deadline to appeal property taxes in San Francisco?

The regular Assessment Appeals Board filing period for fiscal year 2026/2027 is Thursday, July 2, 2026 through Tuesday, September 15, 2026. The Board will not accept late applications. File online for regular real-property assessments, or submit a paper application postmarked by that Tuesday, at the Assessment Appeals Board in City Hall Room 405 (SF Assessment Appeals Board).

San Francisco is a September 15 county, not a November 30 county. Under state law the later November 30 date applies only if the Assessor does not mail a notice of assessed value to all secured-roll owners; San Francisco typically mails that Notice of Assessed Value in July, so the earlier deadline applies. Do not borrow a neighbor's California deadline from another county.

A second, earlier window exists for many homeowners: the Assessor's free informal review runs January 2 through March 31. That window for 2026 is closed. Missing it does not end your rights — the formal September 15 path remains — but the informal review does not extend the formal deadline. Supplemental, escape, and roll-correction notices run on 60-day clocks of their own; calamity reassessments have six months. Details live on the deadlines page.

What is a San Francisco property tax appeal?

You are not appealing the tax rate. You are appealing the Assessor's opinion of market value as of January 1, which becomes the number the Treasurer multiplies by the year's rate. For Fiscal Year 2025-26 that secured rate is 1.18268325%. Direct charges and special assessments on the October bill are a separate line; winning a value appeal generally does not erase them. Read how to read an SF tax bill and assessment notice before you decide which number is wrong.

California's Proposition 13 system is why a high market neighborhood is not automatically a high taxable neighborhood. Your enrolled value is usually the lower of (a) your factored base-year value (purchase or last reassessable event, plus an annual inflation factor capped at 2%) or (b) current market value. When market value on January 1 sits below that factored base year, you are in Proposition 8 / decline-in-value territory. That reduction is temporary. It does not reset your Proposition 13 base year (SF.gov — decline-in-value).

A San Francisco property tax appeal is therefore a market-value case as of the lien date, not a complaint that the bill "went up," and not an unequal-appraisal argument that your neighbor is assessed lower. California boards are not asked to equalize you to a neighbor's roll number. They are asked what the property would have sold for on January 1.

Nationally, the National Taxpayers Union Foundation estimates that 30 to 60 percent of taxable property is over-assessed and that fewer than 5 percent of owners challenge it. That is a national figure, not a San Francisco win rate — we do not publish neighborhood or city success rates we cannot source. The useful takeaway is the same: most people never look.

Should I request an informal review or file a formal appeal?

San Francisco runs two separate processes, in two offices, on two calendars.

Free informal review (Assessor-Recorder), January 2–March 31. Eligible property: single-family dwellings, residential condominiums, townhouses, live-work lofts, and cooperative units. It is free. There is no hearing. You submit comparable sales supporting your opinion of value as of January 1 — the Assessor asks for two sales as close as possible to January 1 and no later than March 31. Results arrive in July as the Notice of Assessed Value. Third-party filings are not accepted (Apply for a decline-in-value).

Tenancy-in-common (TIC) units are excluded from informal review because they do not have separate parcel numbers. TIC owners file a formal Application for Changed Assessment with the Assessment Appeals Board during the July 2–September 15 window (decline-in-value FAQ).

Formal appeal (Assessment Appeals Board), July 2–September 15. Available for all property types. Non-refundable $120 administrative processing fee per application, effective August 1, 2025, payable to the City and County of San Francisco. The fee is waived if you qualify for a court-fee waiver, if the property is assessed at $7,500 or less, or if the gap between the assessed value and your opinion of value is $7,500 or less (AAB fees). You can file both: the informal review first, then a formal application if you disagree with the July notice — or to protect the September 15 date while the informal result is still outstanding.

The form is BOE-305-AH, the Assessment Appeal Application (San Francisco materials also still say Application for Changed Assessment). Use San Francisco's form, not another county's. Online filing covers regular assessments of secured and unsecured property; base-year, supplemental, escape, and roll-correction appeals go on paper (AAB).

How do Proposition 8 and Proposition 13 affect my SF assessment?

Proposition 13 is the ceiling: a base-year value that can rise by no more than 2% a year unless you sell, complete new construction, or trigger another reassessable event. Proposition 8 is the floor-check: if January 1 market value is below that factored base year, the Assessor is required to enroll the lower number for that tax year. The next January 1, they look again. If the market has recovered toward your base year, the enrolled value can be restored up to — but not above — the factored Prop 13 number (SF.gov).

That is why a longtime owner with a 1990s base year often has nothing to appeal: the roll is already far below market. The people who should look are recent buyers, anyone whose enrolled value was set in a stronger year, and anyone whose prior Prop 8 reduction was restored. The Proposition 8 San Francisco guide is the full version of this rule.

Separately, if you own and occupy the home as your principal residence, claim the homeowners' exemption: up to $7,000 off assessed value, about $80 a year. File by 5:00 p.m. on February 15 for the full amount; a claim from February 16 through December 10 gets 80% (File for the homeowners' exemption). It is not an appeal. It stacks with one.

What evidence do I need for a San Francisco property tax appeal?

Comparable sales. The California State Board of Equalization's Publication 30 is explicit: in most residential appeals the most reliable evidence is sales of similar properties, judged on three tests — arm's-length open-market conditions, physical similarity, and timing relative to the valuation date. You then adjust each sale for the differences (beds, baths, living area, lot, view, condition, quality) and compare on price per square foot of living area, excluding garage, porch, and patio.

The timing trap is the one the state itself calls the most common error in all assessment appeals: an appeals board may not consider comparable sales that closed more than 90 days after the valuation date (BOE assessment appeals FAQs; Pub 30). For a January 1 lien date that means no sale later than about April 1 — and for the Assessor's informal review, no sale later than March 31. A June closing down the street, however perfect a match, is out. Closed sales beat listings. Listings and automated value estimates are not sales.

San Francisco geography makes "similar" stricter than a ZIP code. The Planning Department established 37 named neighborhoods for notification; those names (Noe Valley, Mission, Inner Sunset, Outer Sunset, Inner Richmond, Outer Richmond, Pacific Heights, Bernal Heights, and the rest) are not interchangeable markets. A condo's strongest comps are usually in the same building. The finding comparable sales guide is the method page; neighborhood pages below are the local version of "don't import the wrong hill."

Condition still counts. Dated photos of deferred maintenance plus a contractor's written estimate give the board a dollar figure for why your house sits below the adjusted comps. Factual errors on the property record — square footage, bedroom count, a finished basement that was never finished — are the cleanest corrections of all.

How much does a San Francisco assessment appeal cost?

The county's price to file is $120, non-refundable once accepted, with the three waivers listed above (AAB fees). If the case is heard by a full three-member Board panel and the property is assessed above $250,000, a hearing fee is also due no later than 30 days before the hearing: $100 for assessments from $250,001 to $2,000,000, then a published ladder above that. There is no hearing fee when the property is assessed at $250,000 or less, or when a residential applicant elects a hearing officer. Half the hearing fee is refundable if the Board lowers the value to your opinion of value or by 30% or more, if you request that refund in writing within 30 days of the decision.

Written findings of fact — the document you need if you intend to go to Superior Court — cost $430 per hour with a one-hour deposit, maximum 30 billable hours. They are not available after a hearing-officer proceeding.

AppealKit's own charge is a flat fee for the packet, not a percentage of whatever you save, and not a substitute for the county fee. We do not quote a dollar price on this page. The free check is free: no account, no email to see the result. You file the county application yourself.

What happens at the Assessment Appeals Board hearing?

The Assessment Appeals Board is independent of the Assessor. It meets Monday through Friday in two sessions, 9:30 a.m. and 1:30 p.m. (AAB). You will get at least 45 days' notice of the first hearing date. By law the Board has up to two years from a timely filing to hear and decide (BOE FAQs). Many cases settle earlier by stipulation with the Assessor.

For an owner-occupied single-family home that is your principal residence, the Assessor bears the burden of proof and presents first (Publication 30). You still need to bring the comps; the board decides from evidence actually presented at the hearing, not from anything attached to the application or emailed earlier. Hearing-officer hearings (single-family, condos, co-ops, or buildings of four units or fewer) are less formal; bring three sets of documents. A full Board hearing: six sets. Either side may reject a hearing officer's recommendation within 14 days and go to a three-member panel (AAB information page).

The Board can decrease, confirm, or increase the enrolled value. That is the honest difference from the free informal review, which has no upside-down risk: if the Assessor disagrees, your value simply stays. Show up. A missed hearing is a denial for nonappearance. The full walkthrough is the SF Assessment Appeals Board hearing guide. You do not need a lawyer; see do I need a lawyer to appeal property tax?.

Do I still have to pay my San Francisco property tax bill?

Yes. Filing an appeal does not pause the Treasurer's due dates. The first installment of the secured bill is delinquent after 5:00 p.m. on December 10; the second after 5:00 p.m. on April 10; each carries a 10% penalty if late (Secured property taxes). If the Board later reduces the value, the county issues a proportionate refund with interest. Check the "claim for refund" box on the application if you want that processed automatically; the AAB information page explains the Superior Court timing tradeoff of that box.

Which San Francisco neighborhoods have their own appeal guides?

Sales patterns are local. Start with the neighborhood that matches how SF Planning names the map, then use citywide rules from this hub:

Noe Valley
Pacific Heights
Sunset (Planning splits Inner Sunset, Outer Sunset, and Parkside)
Richmond (Planning splits Inner Richmond, Outer Richmond, and Seacliff)
Mission
Bernal Heights

The rest of the cluster: step-by-step how-to, how to read the bill, Proposition 8, finding comparable sales, AAB hearing, deadlines, and the national how-to if you want the non-local version. When you want the math on your roll number, the free check runs comparable sales against the January 1 date. If there is no case, we say so.

FAQ

What is the deadline to appeal property taxes in San Francisco?

For a regular 2026/2027 assessment, file with the Assessment Appeals Board between July 2 and September 15, 2026. The Board does not accept late applications. The Assessor's free informal review, for qualifying residential property, runs January 2 through March 31 and does not extend September 15. Supplemental, escape, and roll-correction notices have 60-day deadlines of their own (sf.gov AAB).

Is checking my San Francisco property assessment really free?

Yes. Enter your address and we run the comparable-sales math — no account, no email, no charge to see the result. You only pay a flat fee if you want a hearing-ready packet. We never take a percentage of savings. The county still charges its own $120 filing fee if you file a formal appeal.

What's the difference between the informal review and the formal appeal?

The informal decline-in-value review is run by the Assessor-Recorder, is free, is limited to listed residential types (not TICs), runs January 2–March 31, and has no hearing. The formal appeal goes to the independent Assessment Appeals Board, costs $120, runs July 2–September 15, and can go to a hearing. Many owners start informal and still file formally to protect the September 15 date.

How much does it cost to file a formal appeal in San Francisco?

A $120 non-refundable administrative processing fee per application, with published waivers for court-fee-waiver eligibility, assessments of $7,500 or less, or an opinion-of-value gap of $7,500 or less. A later hearing fee can apply on a full Board panel for properties assessed above $250,000; hearing officers are free of that fee (sf.gov AAB fees).

What evidence do I need?

Closed comparable sales near the January 1 lien date, adjusted for differences, ideally on a price-per-square-foot of living area basis. The board may not consider sales more than 90 days after January 1. Informal review will not consider sales after March 31. Listings and automated estimates are not evidence (BOE Publication 30; BOE FAQs).

Can my assessment go up if I appeal?

At a formal hearing, yes — the Board can decrease, confirm, or increase the value based on the evidence. That outcome is uncommon when the evidence is solid and is the reason to skip a thin case. The free informal review has no such downside: disagreement leaves the value unchanged (BOE assessment appeals FAQs).

Do I need a lawyer to appeal my San Francisco property taxes?

No. You may represent yourself. A spouse, parent, child, or California-licensed attorney may appear without a separate agent authorization; anyone else needs written authorization. Hearings are quasi-judicial but, in the state's words, not as formal as a court of law (Publication 30).

Do I have to pay my tax bill while the appeal is pending?

Yes. December 10 and April 10 remain in force. If you win after paying, the county refunds the difference with interest. Failure to pay on time adds penalties regardless of the appeal (BOE FAQs; SF Treasurer).

Sources

San Francisco Assessment Appeals Board — FY 2026/2027 filing period July 2 through September 15, 2026; no late applications; meeting times; City Hall Room 405. -> https://www.sf.gov/departments--assessment-appeals-board
Apply for a decline-in-value — informal review January 2–March 31, eligible residential types, two comps no later than March 31, $120 formal fee. -> https://www.sf.gov/apply-decline-value
Decline-in-value / Proposition 8 — temporary reduction, annual review, TICs excluded from informal review. -> https://www.sf.gov/information--learn-about-tax-savings-decline-value
Assessment Appeals Board fees — $120 processing fee effective August 1, 2025; waivers; hearing-fee schedule; findings of fact $430/hour. -> https://www.sf.gov/assessment-appeals-board-fees
Assessment Appeals Board information page — 90-day comps window, hearing officer vs Board, copies of evidence, burden of proof, two-year clock. -> https://www.sf.gov/assessment-appeals-board-information-page
Annual Notice of Assessed Value — typically mailed in July; not a bill. -> https://www.sf.gov/information--notice-assessed-value
File for the homeowners' exemption — $7,000 / about $80; February 15 full; February 16–December 10 80%. -> https://www.sf.gov/file-homeowners-exemption
Secured property taxes — FY 2025-26 rate 1.18268325%; December 10 and April 10; 10% penalty. -> https://sftreasurer.org/property/secured-property-taxes
BOE Publication 30 — residential appeals method, 90-day comps error, burden of proof, board may raise or lower. -> https://www.boe.ca.gov/proptaxes/pdf/pub30.pdf
BOE assessment appeals FAQs — 90-day comps rule; pay while pending; two years; board may increase. -> https://www.boe.ca.gov/proptaxes/faqs/assessappeals.htm
SF Planning neighborhood group organizations — 37 named neighborhoods, no official boundaries otherwise. -> https://sfplanning.org/resource/neighborhood-group-organizations
National Taxpayers Union Foundation — 30–60% of U.S. taxable property over-assessed; fewer than 5% of owners challenge (national, not SF-specific). -> https://www.ntu.org/foundation/tax-page/are-you-paying-too-much-in-taxes

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