The ad valorem tax in Arizona is a yearly property tax billed by the county where your property sits, calculated from what the property is worth rather than a flat fee. Three variables set the final number: your property’s classification, its capped value, and the combined tax rates charged by the local jurisdictions that serve you. Once you understand how those three pieces fit together, the figures on your Notice of Value and your annual tax statement stop being mysterious.
How Arizona Classifies Your Property
Every taxable property in Arizona belongs to a legal class, and each class carries an assessment ratio: the percentage of value that actually gets taxed. The ratio is the single biggest reason a business owner and a homeowner pay very different bills on properties worth the same amount.1Arizona Legislature. Arizona Code 42-12001 – Class One Property
- Class 1 covers commercial and industrial property. The assessment ratio is 15.5% for tax year 2026 and drops to 15% beginning in tax year 2027.2Arizona Legislature. Arizona Code 42-15001 – Assessed Valuation of Class One Property
- Class 2 covers agricultural property at a 15% ratio.3Arizona Department of Revenue. Property Classification
- Class 3 is your owner-occupied primary residence at 10%.4Arizona Legislature. Arizona Code 42-15003 – Assessed Valuation of Class Three Property
- Class 4 is rental and other residential property not used as a primary home, also at 10%.5Arizona Legislature. Arizona Code 42-15004 – Assessed Valuation of Class Four Property
Consider a $500,000 commercial building and a $500,000 home. The commercial property has an assessed value of $77,500. The home comes in at $50,000. Apply the same tax rate to both and the commercial bill is substantially higher. When your Notice of Value arrives, confirm the class code matches how you actually use the property. A rental marked as owner-occupied, or a home mistakenly placed in Class 1, changes the math immediately.
Full Cash Value and Limited Property Value
Your parcel carries two valuation numbers. Full Cash Value is the assessor’s estimate of what the property would sell for on the open market, and it moves with the market. Limited Property Value is the number Arizona actually taxes you on, and it is capped to protect owners from sudden spikes.6Arizona State Board of Equalization. Property Valuation – Section: What Is the Limited Property Value and How Is It Determined?
Under the standard rule, Limited Property Value can rise no more than 5% over the prior year’s Limited Property Value, and it can never exceed Full Cash Value.7Arizona Legislature. Arizona Code 42-13301 – Limited Property Value In a down market the two figures can converge, or the limited value can drop.
When something interrupts the normal progression, such as new construction, demolition, a change in use, or correction of a prior error, the assessor switches to a different method. The new Limited Property Value is set by looking at the ratio of limited value to full cash value for comparable properties in the same class and area.6Arizona State Board of Equalization. Property Valuation – Section: What Is the Limited Property Value and How Is It Determined? That keeps a freshly improved property from inheriting an artificially low capped value.
Primary and Secondary Tax Rates
Your bill has two layers. Primary rates fund the ongoing operations of local government: school districts, community colleges, county services, and similar recurring costs. Secondary rates fund voter-approved items like municipal bonds, school budget overrides, fire districts, and special improvement districts. Both appear separately on your annual statement.
Rates are expressed as a dollar amount per $100 of assessed value. Because secondary rates depend on what voters in your specific area have approved, two identical homes in different parts of the same county can produce noticeably different bills. Your exact combined rate shows on your annual tax statement or your county treasurer’s website.
Running the Calculation
You need three numbers: Limited Property Value, your class assessment ratio, and the combined tax rate for your location.
Take a Class 3 owner-occupied home with a Limited Property Value of $350,000 in a jurisdiction with a combined rate of $11.00 per $100 of assessed value:
- Assessed value: $350,000 × 10% = $35,000
- Tax: $35,000 ÷ 100 × $11.00 = $3,850
Now take the same $350,000 value as Class 1 commercial property at the 2026 ratio and the same combined rate. Assessed value is $54,250, and the tax bill comes to $5,967.50.2Arizona Legislature. Arizona Code 42-15001 – Assessed Valuation of Class One Property The classification alone adds more than $2,100 on identical dollar values.
Your county assessor’s online portal lets you look up any parcel by address or Assessor’s Parcel Number, and the Notice of Value mailed each year lists Full Cash Value, Limited Property Value, and class code.
When Payments Are Due
Arizona splits the annual bill into two installments. The first half is due October 1 and becomes delinquent after 5:00 p.m. on November 1. The second half is due March 1 and becomes delinquent after 5:00 p.m. on May 1.8Arizona Legislature. Arizona Code 42-18052 – Due Dates and Times; Delinquency If a cutoff falls on a weekend or holiday, it shifts to 5:00 p.m. on the next business day.
One exception: if your total annual tax is $100 or less, the full amount is due October 1 and becomes delinquent after 5:00 p.m. on December 31.8Arizona Legislature. Arizona Code 42-18052 – Due Dates and Times; Delinquency
Delinquent taxes accrue interest at 16% per year, simple, with any portion of a month counting as a full month.9Arizona Legislature. Arizona Code 42-18053 – Interest on Delinquent Taxes The county treasurer collects payments online, by mail, and in person. Many owners pay through a mortgage escrow account, where the lender folds the tax into the monthly payment and remits to the treasurer directly.
What Happens If You Don’t Pay
Unpaid taxes do more than rack up interest. The county treasurer sells tax lien certificates on delinquent parcels at a public auction, usually held in February. Investors bid by offering the lowest interest rate they will accept, up to 16%.10Arizona Auditor General. County Treasurer – Property Taxes The winning bidder pays off the delinquent taxes, and you then owe that investor the tax amount plus interest.
You have three years from the date of the lien sale to redeem by paying the full balance plus accrued interest and fees. If you don’t, the lien holder can file a foreclosure action in Superior Court and potentially take title.11Arizona Legislature. Arizona Code 42-18201 – Action to Foreclose Right to Redeem The lien holder has to begin foreclosure within ten years of acquiring the lien or it expires. People lose property this way that they could have saved for a relatively small payment years earlier.
Programs That Can Lower Your Bill
Several Arizona programs reduce or eliminate part of a property tax bill. Most require an annual application, so missing the deadline means waiting a full cycle.
Senior Property Valuation Freeze
Homeowners aged 65 or older can apply to freeze both the Full Cash Value and Limited Property Value of a primary residence, blocking future increases while the owner remains eligible. If the home is sold to someone who doesn’t qualify, the freeze ends. Average household income over the previous three years cannot exceed $47,712 for a single owner or $59,640 for two or more owners, counting income from all sources including Social Security and veterans’ disability.12Maricopa County Assessor’s Office. Senior Valuation Relief Applications go to the county assessor with three years of federal returns.
Widow, Widower, and Disability Exemption
Qualifying widows, widowers, and people with a total and permanent disability can apply an exemption directly against their assessed Limited Property Value. Total household income (excluding Social Security, military pensions, and veterans’ disability) cannot exceed $39,865 without minor children, or $47,826 with minor children or children with disabilities.13Maricopa County Assessor’s Office. Personal Exemptions The exemption reduces assessed value by up to $4,873. If the assessed value is lower than the exemption, the bill can be zeroed out. Applications are due by February 28 each year.
Business Personal Property Exemption
Business owners pay ad valorem tax on tangible personal property such as equipment, furniture, fixtures, and machinery, and must file a Business Personal Property Statement with the county assessor by April 1. Beginning January 1, 2026, the exemption increases to $500,000 in assessed value, which removes the tax entirely for many small and mid-sized operations.14Arizona Legislature. Fact Sheet for S.B. 1749 Confirm with your assessor whether a filing is still required even if you expect to fall below the threshold.
If You Think Your Value Is Too High
Appeals almost always target the Full Cash Value, since that figure drives the Limited Property Value over time. You cannot directly appeal the Limited Property Value unless there was a calculation error.15Arizona State Board of Equalization. Property Valuation
Start With the County Assessor
File a Petition for Review of Valuation with your county assessor within 60 days of the mailing date on your Notice of Value.16Arizona Legislature. Arizona Code 42-16051 – Petition for Assessor Review Use the right form for your property: DOR 82130R for residential, DOR 82130 for commercial, or DOR 82530 for personal property.17Arizona State Board of Equalization. How To Appeal Attach supporting evidence: recent comparable sales, a professional appraisal, or documentation of property defects. The assessor issues a written decision.
Appeal to the State Board of Equalization
If the assessor’s decision doesn’t resolve things, you have 25 days from the date that decision was mailed to appeal to the Arizona State Board of Equalization.17Arizona State Board of Equalization. How To Appeal Submit the original petition, the assessor’s decision, and your evidence. The Board does not accept fax or email, and a letter does not substitute for the required forms.
Superior Court
The final step is a complaint in Superior Court. The standard deadline is December 15 of the year before the tax year, and your taxes for the year in dispute must be paid on time with no delinquent balances from prior years.18Maricopa County Superior Courts. Tax Case Preparation and Trial Guide The Small Claims Division offers a simplified process for owner-occupied residences of any value and for commercial property with a Full Cash Value of $2,000,000 or less, though its decisions cannot be appealed.