Travis Bunn
Founder, AppealDesk · Published February 28, 2026 · Updated March 17, 2026
Filing deadline: September 15 or November 30 (November 30, 2026), 20 days away. Check your notice; your county may set an earlier date.
Check your property now, $49 flat fee →Knowing your deadline is half of it. The other half is whether the county’s number is actually too high, because a deadline you meet with no case is just paperwork. Checking your number is free and takes about a minute.
Free to check. No account needed.
Start your California appeal: Los Angeles County · San Diego County · Orange County · Santa Clara County
Updated March 2026
California property tax appeal deadlines run from July through December, varying by county. Unlike regular reassessments protected by Prop 13, decline-in-value appeals require annual filing.
Knowing the date is the easy part. The date only matters if the county's number is actually too high, and nobody checks that number for you.
The number your appeal would challenge, pulled free in seconds. No account needed.
Many California homeowners assume decline-in-value adjustments happen automatically. They don't.
You must file annually to get/keep Prop 8 reductions. Counties will restore your full Prop 13 value without notice if you don't appeal.
California is strict. No deadline extensions except for:
"I didn't know" or "was traveling" = denied.
Cost of missing: If over-assessed by $100,000, you lose $1,000+ in savings for the year.
Minimal for filing:
Evidence comes later: File first, build case second. Don't miss deadline gathering evidence.
A real AppealDesk order, Contra Costa County
In May 2026, a homeowner in Contra Costa County ran the check. The county had their home on record at $1,485,691, while recorded sales of comparable homes supported about $976,571: an over-assessment of $509,120, worth roughly $6,660 per year if corrected. Their packet laid out the comparable sales, the forms, and the filing steps. Nobody at the county was ever going to run that check for them.
A deadline you meet with no evidence behind it is just paperwork. Comparable sales are what boards actually respond to, and pulling your county's number is where that starts.
Enter your address to pull your county record free. If it looks too high, your $49 packet gives you the comparable sales, forms, and filing steps.
California's county-by-county system is confusing by design. Add Prop 13 vs Prop 8 rules, and most homeowners give up.
AppealDesk simplifies California appeals with:
Whether it's July 2 or November 30, California counties don't negotiate deadlines. File on time or pay full assessment.
The average California appeal saves $2,053 per year. In high-value counties, savings often exceed $5,000 annually.
Don't leave that money on the table. Check your county deadline. Mark your calendar. File on time.
Your move. Their money. Choose wisely.