Maricopa County, Arizona

A petition must be filed within 60 days after the date the Assessor mails your Notice of Valuation. The Assessor mails the Notice of Valuation sometime between January 1 and March 1 each year. The 2026 notice mailed February 20, 2026, giving an April 21, 2026 deadline, already past as of this data's verification date. The next cycle's notice is expected around February 2027. If you miss the appeal window, a separate "Notice of Claim" can still correct factual errors like square footage, for the current year and the prior three tax years. A court appeal alternative is available through December 15 of the notice year.