Maricopa County Property Tax Appeal — Deadline & How to File 2026
60 days after your Notice of ValueNo single calendar date — the clock starts when YOUR Maricopa County value notice is mailed (60 days).
Yes — you can appeal your Maricopa County assessment. The deadline is 60 days after your Notice of Value (Assessor) — or Tax Court by Dec 15, so the clock (60 days) starts the day your notice is mailed. File with the County Assessor → State/County Board of Equalization → Tax Court.
Notice-relative deadline — confirm the exact 2026 date printed on your notice / with the County Assessor → State/County Board of Equalization → Tax Court.
Is my property over-assessed in Maricopa County?
You're over-assessed when the County's value is higher than what your home would actually sell for — and then you're over-paying every year until you appeal. Arizona's administrative appeal to the Assessor is due ~60 days after the Notice of Value (mailed by March 1), per A.R.S. §42-15101/§42-16051. A separate Tax Court appeal is available through December 15. Arizona uses Full Cash Value (market).
Live Maricopa County parcels whose assessed market value exceeds their recent arm's-length sale price — a real over-assessment signal pulled from the public assessor roll. If your parcel looks like these, you have a strong appeal:
How to appeal your Maricopa County assessment — and who files it for you
Pull your current assessed value from the Maricopa County assessor portal.
Find your market value — a recent sale of your home, or comparable nearby sales.
If the County's number is higher, file an appeal with the County Assessor → State/County Board of Equalization → Tax Court by 60 days after your Notice of Value (Assessor) — or Tax Court by Dec 15.
Present your comparables (and any appraisal) at the hearing.
Most owners who win use a contingency property-tax appeal firm — it costs nothing unless they cut your bill, then takes a share of the first-year saving. About 95% of over-assessed owners never appeal, so the saving is usually left on the table.
What is the Maricopa County appeal deadline this year?
60 days after your Notice of Value (Assessor) — or Tax Court by Dec 15 (the clock starts when your notice is mailed).
How much does it cost to appeal?
Usually a small filing fee or none; a contingency firm only charges if it wins a reduction.
I got a reassessment notice — what now?
It's the County's new market-value opinion and the start of your appeal window. Check it; appeal by 60 days after your Notice of Value (Assessor) — or Tax Court by Dec 15 if it over-states your home's value.
Will appealing raise my taxes?
In most jurisdictions an appeal can only confirm or lower your assessment for that cycle — but confirm the rules with the County Assessor → State/County Board of Equalization → Tax Court before filing.
Source & verification
against the official Maricopa County / AZ deadline (mcassessor.maricopa.gov · A.R.S. §42-16051). These are public deadline facts, not legal or tax advice — confirm your exact date with the County Assessor → State/County Board of Equalization → Tax Court and consult a professional before filing.