California Property Tax Appeal
How to Appeal Your Property Taxes in San Bernardino County (2026)
San Bernardino is the largest county in the contiguous United States by land area, spanning everything from dense valley suburbs to high-desert towns — and values move very differently across those markets. An assessment that made sense at the top of the market can lag well behind a neighborhood that has since softened, and that lag is exactly what an appeal corrects.
San Bernardino doesn't publish a separate informal-review form, so the first move here is a direct call to the Assessor's office to discuss a Decline-in-Value (Prop 8) reduction before you file anything formal. If it does come to a formal appeal, plan the logistics: the filing fee must be paid by cash, check, or money order made out to the Clerk of the Board.
Below is the full San Bernardino County process — the November 30 deadline, the form, the fee and how to pay it, and the informal-first path — along with an honest read on whether your home is overassessed.
San Bernardino County appeal — at a glance
- Appeal deadline
- July 2 – November 30
- Filing fee
- $45
- Appeal form
- BOE-305-AH
- Assessor's office
- (909) 387-8307
Check your San Bernardino County home in minutes
Enter your address and get an honest, comparable-sales analysis of whether you're overassessed — $9.99, with 3 years of monitoring included.
Analyze my assessmentFlat fee. You keep 100% of your tax savings.
Is your San Bernardino County home overassessed?
California property tax bills run roughly 1.1%–1.25% of a home's assessed value. At that rate, an assessment that's $50,000 too high costs a homeowner on the order of $550–$625 every single year — and it compounds until someone corrects it.
The only way to know is to compare your assessed value against what similar nearby homes actually sold for. That's exactly what a Numa analysis does: real comparable sales, an honest overassessed / fairly-assessed verdict, and a conservative savings estimate — for $9.99, with 3 years of monitoring included.
How to appeal in San Bernardino County, step by step
- 1
Confirm your home is overassessed
Your case rests on recent sales of comparable homes. Gather a few similar properties nearby that sold recently, adjust for differences in size, age, and condition, and check whether they came in below your assessed value. This is the most time-consuming part of an appeal, and the quality of those comparables is what decides it.
- 2
Request an informal review with the Assessor
In San Bernardino County, start with an informal Decline-in-Value (Proposition 8) review — often the fastest path, resolved without a hearing. Contact (909) 387-8307 for the informal review process..
- 3
File a formal appeal if needed
If the informal review doesn't resolve it, file form BOE-305-AH with the Assessment Appeals Board — before the November 30 deadline. You can file online, by mail, or in person.
- 4
Present your evidence
Your comparable-sales evidence is what wins the appeal. Numa's $24.99 packet assembles it into a ready-to-file case — and if the informal review fails, the formal Appeals Board packet is included at no extra charge.
Do it yourself, or let Numa do the hard part
You can absolutely appeal on your own — the deadline, form, and steps above are all you need to file. The catch is Step 1: building the comparable-sales evidence that actually wins. Here's the honest trade-off.
Do it yourself
- Free
- Typically 5–10 hours of work
- You find, adjust, and score the comps yourself
- Amateur evidence is the top reason appeals fail
- No easy way to know if you should file at all
With Numa
- $9.99 analysis, done in minutes
- Real comparable sales, scored the way the county does
- An honest verdict — including “don't file, you're fairly assessed”
- 3 years of monitoring included
- Optional $24.99 ready-to-file evidence packet if you're overassessed
San Bernardino County key dates
- Appeal window: July 2 – November 30
- Payment by cash, check, or money order payable to Clerk of the Board.
- Prop 8 (decline in value): Same as regular appeal deadline.
San Bernardino County property tax appeal — FAQ
What is the property tax appeal deadline in San Bernardino County?
The regular appeal window runs July 2 through November 30. Payment by cash, check, or money order payable to Clerk of the Board.
How much does it cost to appeal property taxes in San Bernardino County?
The filing fee is $45.
Do I have to go to a hearing to lower my assessment?
Often not. In San Bernardino County you can request an informal review (a Decline-in-Value / Proposition 8 request) with the Assessor first — many reductions are resolved this way without a formal hearing. If the informal review doesn't succeed, you can file a formal appeal with the Assessment Appeals Board.
How do I know if my San Bernardino County home is overassessed?
Your home is overassessed if comparable homes recently sold for less than your assessed value. Numa runs that comparison for you — the same comparable-sales method the county uses — and gives you an honest verdict for $9.99, with 3 years of monitoring included.
What form do I use to appeal in San Bernardino County?
Formal appeals use form BOE-305-AH, filed with the Assessment Appeals Board. Numa's packet fills in the evidence and shows you exactly how to file it.
Check your San Bernardino County home in minutes
Enter your address and get an honest, comparable-sales analysis of whether you're overassessed — $9.99, with 3 years of monitoring included.
Analyze my assessmentFlat fee. You keep 100% of your tax savings.