Which county valuation governs the residential alteration threshold
Sent to ADOR Tax Policy on August 13, 2026. Answered August 13, 2026.
The question
A county Notice of Value carries two figures, the Full Cash Value and the Limited Property Value, and they routinely differ by a material amount. The residential alteration threshold is stated as 25 percent of the property's value as determined by the county assessor, without naming which of the two applies. The choice changes the denominator and can change whether a contract keeps alteration status.
What ADOR said
The parcel's most recent full cash value governs, not the limited property value. ADOR cites A.R.S. 42-5075(S)(1)(a) directly and directs use of the county assessor's website to establish full cash value, with the alteration contract value at 25 percent or less of that figure.
What changed. The glossary entries Full cash value, Limited property value, County assessor, Notice of Value, and Alteration threshold; the Classifier's residential threshold branch.