How to appeal a Maricopa County, AZ property assessment
✓ Verified — Last verified October 24, 2026
Filing details published for Maricopa County. Match the notice and assessment cycle to the official instructions.
Official appeal instructionsNot tax or legal advice; confirm with your county.
Filing timing
Notice-dependent instructions
For the 2027 valuation notice: the county lists April 21, 2026 for the administrative petition and December 15, 2026 for Tax Court.
Official source. Verified .
Where to file
Tax Court or Small Claims Court, 125 W Washington, Phoenix; phone 602-506-8297.
Official source. Verified .
Assessment notice period
The 2027 Notice of Valuation was scheduled to be mailed February 20, 2026.
Official source. Verified .
Official offices
Maricopa County Assessor
Sources for these instructions
https://www.mcassessor.maricopa.gov/page/residential_property/
April 21, 2026 … Property owner deadline to file "2027 Petition for Review of Real Property Valuation" A.R.S. § 42-15102 … December 15, 2026 … Property owner deadline to file 2027 Notice of Valuation with Tax Court A.R.S. § 42-16201
Verified October 24, 2026
https://www.mcassessor.maricopa.gov/page/residential_property/
More information can be found at Tax Court or Small Claims Court at 125 W Washington Phoenix AZ or call 602-506-8297.
Verified October 24, 2026
Continue with your property
Common questions
Where do I file a Maricopa County assessment appeal?
Tax Court or Small Claims Court, 125 W Washington, Phoenix; phone 602-506-8297.