How to Appeal Property Taxes in Maricopa County, Arizona (2026 Guide)

Direct answer: For Maricopa County real property, the 2026 administrative appeal deadline for the 2027 Notice of Valuation was April 21, 2026—60 days after the Assessor mailed notices on February 20, 2026. File through the Maricopa County Assessor Customer Portal when open, or by mailing/hand-delivering ADOR Form 82130R to Maricopa County Assessor’s Office, 301 W. Jefferson St., Phoenix, AZ 85003; email is not accepted for real-property valuation appeals.

Because today is July 6, 2026, that Assessor-level deadline has passed for most homeowners. If you missed it, you may still be able to go directly to Arizona Tax Court/Small Claims by December 15, 2026, or use a Notice of Claim only for a factual or legal-classification error affecting 2026 or the prior three years.

How assessments work in Maricopa County

Maricopa County is already working on the 2027 tax year. The 2027 Notice of Valuation mailed February 20, 2026, and it affects taxes billed in fall 2027—not the bill you receive in 2026. Arizona values real property a year ahead so owners have time to appeal before tax rates and bills are finalized.

Your notice shows two important values:

• Full Cash Value (FCV): the appealable market-value estimate. Maricopa uses mass appraisal, looking at data such as sales, location, lot size, living area, age, property use, zoning, view, topography, and other characteristics.
• Limited Property Value (LPV): the taxable value used to calculate most Arizona property taxes. LPV usually cannot rise more than 5% per year and cannot exceed FCV, unless a “Rule B” event applies—new construction, a major addition/deletion, split/consolidation, omitted property, or a change in use.

For most owner-occupied homes, the legal class should be Class 3 primary residence, with a 10% assessment ratio. That means a $250,000 LPV becomes $25,000 of net assessed value before tax rates are applied. If the home is shown as a rental, second home, or wrong class, fix that quickly because classification can affect taxes and state-aid treatment.

The Assessor sets values and legal classifications. The Treasurer calculates and collects tax bills. A lower FCV does not always lower your bill immediately if your LPV remains below the reduced FCV—but lowering FCV can matter if it caps future LPV growth or corrects a Rule B/reset situation.

Whether you should appeal

Appeal when you can prove one of these Maricopa-specific problems:

1. FCV is above market. Use comparable sales in your same subdivision, ZIP, school district, or nearby neighborhood, preferably sales near the valuation date and similar in living area, lot size, age, pool/garage, condition, and remodel level.
2. The Assessor’s property data is wrong. Check living area, lot size, pool, number of stories, construction quality, year built, additions, and whether an Arizona room or enclosed patio is counted correctly.
3. Legal class is wrong. If this is your one primary residence—or a qualified family member’s primary residence—Class 3 may apply. Vacation homes and rentals generally do not qualify.
4. Your LPV jumped because of Rule B. You generally cannot appeal LPV directly, but you can challenge the FCV, classification, or factual premise that triggered the reset.

Do not appeal just because the tax bill went up. In Maricopa County, many bills rise because LPV increased up to 5%, rates changed, school bonds/overrides apply, or local district budgets changed.

Published results are limited. The Assessor’s FY2025 Annual Report reports 4,036 total appeals received, down from 4,860 the prior year, but it does not publish a success rate, median reduction, or average homeowner savings. Do not trust anyone quoting a countywide “average reduction” unless they can point to an official source.

Step-by-step how to file

1. Confirm the year and deadline. For the regular 2026 appeal season, you were appealing the 2027 Notice of Valuation. Notices were mailed February 20, 2026; the 60-day deadline was April 21, 2026.

2. Use the correct form. Most homeowners use Residential Petition for Review of Valuation, ADOR Form 82130R. Use Petition for Review of Real Property Valuation, ADOR Form 82130 for non-single-family real property. Add Agency Authorization Form 82130AA if a tax agent represents you. Use Multiple Parcel Appeal Form 82131 only when appealing multiple parcels that qualify to be reviewed together.

3. State your requested value and evidence. The form requires your opinion of value and substantial supporting information. For a sales approach, include at least one comparable property in the same geographic area or the subject property’s sale. Better: include three to five comps, with parcel numbers, sale dates, sale prices, square footage, and adjustments.

4. Choose a filing method. Maricopa’s preferred method is the Customer Portal when online appeals are open. Otherwise, mail or hand-deliver the signed petition and evidence to:

Maricopa County Assessor’s Office
301 W. Jefferson St.
Phoenix, AZ 85003

For real-property appeals, emails are not accepted. There is no administrative appeal fee stated for filing with the Assessor; Tax Court filings are separate and may involve court fees.

5. If the deadline has passed, pick the right backup path. A Notice of Claim is not a late value appeal. Use it for a factual error or legal classification error for the current tax year and three prior years. Maricopa says Notices of Claim for 2026 may include 2023, 2024, and 2025 with documentation. Claims may be filed by DocuSign, certified mail/in person, or email to the Assessor’s claims address.

What happens after

At the Assessor level, you may request a meeting by checking the meeting box on Form 82130R. If you cannot attend at the scheduled time, submit written evidence before the meeting date. The Assessor may agree, partially agree, deny, or reject a deficient petition. If rejected for lack of required information, amended-petition rules apply.

For the 2026 cycle, the Assessor must answer regular Notice of Valuation appeals by August 15, 2026. If you disagree with the Assessor’s decision, Maricopa homeowners appeal to the Arizona State Board of Equalization (SBOE) within 25 days of the Assessor’s decision—not to a county board. SBOE filings for Maricopa/Pima may be made through the SBOE e-file process, but required documentation may still need to be mailed or hand-delivered to:

Arizona State Board of Equalization
100 N. 15th Ave., Suite 130
Phoenix, AZ 85007

SBOE hearings are scheduled for accepted appeals and are held in the county where the property is located. A typical hearing starts with any Assessor recommendation, then the homeowner presents evidence, the Assessor responds, the homeowner may rebut, and the hearing officer or Board member decides. Legal Class 3 residential cases are generally heard by one Board member or hearing officer. You are not required to attend, but if you want a phone hearing you must request it in advance under SBOE rules. The county’s 2026 appeal handout says SBOE decisions for the 2027 NOV are due by October 16, 2026.

You can also bypass or follow administrative appeals with Arizona Tax Court/Small Claims. For the 2027 NOV, the direct court deadline is December 15, 2026; if appealing an administrative decision, the court deadline is generally 60 days from the most recent decision.

Local tips

Check exemptions before spending money on an appeal. Arizona does not have a general homeowner “homestead” property-tax exemption like some states; Arizona’s homestead law mainly protects equity from certain creditors. Maricopa homeowners should instead check:

• Primary residence legal class change: if your home recently became your primary residence. Approved changes before July 1, 2026 can apply to 2026 and 2027; after July 1, only 2027.
• Personal exemptions: widows/widowers, totally disabled persons, and disabled veterans may qualify subject to income/residency rules. For 2026, Maricopa lists an exemption up to $4,873 off assessed LPV for many qualifying categories, while a 100% service-connected disabled veteran may qualify for a full primary-residence exemption if all requirements are met.
• Senior Valuation Protection: the “Senior Freeze” freezes the LPV of a qualifying primary residence for three years. For 2026, apply January 1–September 1; Maricopa lists income limits of $47,712 for one owner or $59,640 for two or more owners, averaged over the past three years.

Worked savings example using Maricopa’s actual county rate: Assume your Class 3 primary residence has an LPV/appealable result that ultimately lowers taxable value by $40,000. At the 10% assessment ratio, assessed value drops by $4,000. Using Maricopa County’s adopted FY2026 primary rate of $1.1591 per $100 of assessed value, the county-primary portion of savings is $4,000 ÷ 100 × 1.1591 = $46.36. Your total savings could be higher because school, city, community college, and special-district rates also apply, but those vary by tax area—use your parcel’s tax bill for the full rate stack.