Maricopa County, AZ — Property Tax Underwriting Guide
Arizona · Annual market review
What this means for multifamily underwriting
Maricopa County (Phoenix, Scottsdale, Tempe, Mesa) is one of the highest-growth multifamily markets in the US. Tax = FCV x 0.18 x millage. Underwrite FCV at the purchase price for a full-reset scenario.
Transaction type breakdown
Maricopa County Assessor values commercial property annually at 18% of full cash value (FCV). A sale at a price above the current FCV commonly leads the assessor to revise the FCV upward in the following assessment cycle.
Refinance does not affect the FCV determination.
Ownership change is market evidence; FCV is commonly revised toward the sale price at the next annual review.
Tax appeal information
55.6 mill applied to 18% of FCV yields approximately 1.0% effective rate on market value.
Guide review
County guidance last reviewed: June 15, 2026
Tax-rate scope: Tax-rate scope is not established as parcel-specific; confirm the parcel's taxing-authority stack.
Official sources: Maricopa County Assessor
18% commercial ratio is statutory and firm; millage is a mid-county estimate.
Parclio estimates are underwriting guidance, not legal or tax advice. Always verify millage rates, the seller's assessed value, and appeal deadlines with the county assessor or local counsel before relying on these numbers for a credit decision.
Run a tax reset estimate for Maricopa County
Use Parclio's estimator to model the post-closing tax bill, NOI impact, DSCR change, and underwriting memo language for your next Maricopa County deal.