California Property Tax Appeal
How to Appeal Your Property Taxes in Orange County (2026)
Orange County pairs some of California's highest home values with one of its most owner-friendly appeal setups: there is no filing fee to bring a formal assessment appeal here. That removes the usual excuse to not bother — if your assessment looks too high, challenging it costs you nothing but the time to build your case.
The catch is timing. Orange County asks that any informal review with the Assessor be requested by April 30, well before the formal July 2 – November 30 window. Starting informally is still the smart first move: many Decline-in-Value corrections are handled by the Assessor without a hearing, and Orange County even lets you file the formal application online if it comes to that.
Here's how the whole process works in Orange County — the deadline, the (free) formal filing, and the informal-first path — along with an honest verdict on whether you're overassessed at all.
Orange County appeal — at a glance
- Appeal deadline
- July 2 – November 30
- Filing fee
- Free
- Appeal form
- BOE-305-AH
- Assessor's office
- (714) 834-2727
Check your Orange 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 Orange 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 Orange 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 Orange County, start with an informal Decline-in-Value (Proposition 8) review — often the fastest path, resolved without a hearing. Get the informal review form.
- 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
Orange County key dates
- Appeal window: July 2 – November 30
- Informal review with Assessor MUST be filed by April 30. Deadline extends to next business day if November 30 falls on a weekend/holiday.
- Prop 8 (decline in value): Same as regular appeal deadline. Informal review with Assessor must be filed by April 30.
Orange County property tax appeal — FAQ
What is the property tax appeal deadline in Orange County?
The regular appeal window runs July 2 through November 30. Informal review with Assessor MUST be filed by April 30. Deadline extends to next business day if November 30 falls on a weekend/holiday.
How much does it cost to appeal property taxes in Orange County?
There is no filing fee.
Do I have to go to a hearing to lower my assessment?
Often not. In Orange 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 Orange 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 Orange 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 Orange 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.