Arizona Property Tax Calculator (LPV + Class System)

How this calculator works

Arizona is one of the only states in the country that maintains a true two-tier valuation system. Every parcel carries two numbers on the county assessor's roll: a Full Cash Value (FCV) that approximates fair market value, and a Limited Property Value (LPV) that serves as the actual tax basis. Tax is computed on LPV — not FCV. Under Article 9 § 8 of the state constitution (added by Proposition 117, ratified November 2012, effective tax year 2015), LPV can grow no more than 5% year-over-year for an existing parcel, regardless of how fast FCV rises.

The math is clean once you have the two values:

• this-year LPV = min(this-year FCV, prior-year LPV × 1.05)
• assessed value = LPV × class assessment ratio (10% for owner-occupied primary, 16% for commercial, etc.)
• annual tax = assessed value × combined tax rate (county + city + school + special)

Everything else in this calculator is determining the right class ratio for the property and the right freeze, if any, for a qualifying senior owner.

Arizona's two-tier valuation: FCV and LPV

The two-tier structure is the constitutional legacy of pre-Proposition-117 valuation methodology. The prior LPV formula was a 10-year rolling average of FCV that produced unpredictable swings when market values inflected sharply. Proposition 117 replaced the rolling average with the cleaner 5% annual cap effective tax year 2015 — and structurally separated FCV (used for some sub-state revenue formulas, condemnation, and certain debt-issuance ratios) from LPV (used for the actual property-tax bill the owner pays in October).

On any Notice of Value from Maricopa, Pima, Pinal, or any other Arizona county assessor, both numbers are printed. New buyers often see the gap and assume it's a mistake; long-tenured owners learn quickly that the LPV figure — the smaller one — is what matters.

A common surprise: an owner who refinances does NOT trigger an LPV reset. A mortgage transaction does not change the assessor's records. But major improvements (substantial remodel, new addition, new garage, new pool, gut renovation that adds square footage or changes the use) DO reset LPV to FCV in the year the improvement is added — and the 5% annual cap starts fresh the year after.

The 5% annual LPV cap — how it protects long-term owners

The cap is the single most important feature of Arizona property tax for long-tenured owners. It compounds over time: in a market growing 8–10% per year, the LPV gap widens roughly 3–5 percentage points annually, and after a decade of compounding the gap is substantial. The mechanism:

• A new buyer pays a price typically close to FCV. In year one, LPV = FCV.
• From year two onward, the 5% cap binds whenever FCV grows faster than 5%.
• After 10 years in a hot market (think Phoenix metro 2020–2023), LPV can be 30–40% below FCV.
• The long-tenured owner pays roughly 30–40% less property tax than a new buyer at the same FCV.

The cap does NOT apply in three cases: new construction (LPV is set to FCV in the build year), major improvements (the assessor re-inspects and resets LPV), and change of use or reclassification (e.g., a Class 4 vacant residential lot converted to Class 1 commercial). In each case the 5% cap starts fresh the year after the reset.

The Arizona property class system (§ 42-12001 — § 42-12009)

Arizona's property class system at A.R.S. § 42-12001 through § 42-12009 assigns each parcel to a class that determines the assessment ratio applied to LPV. The classes most commonly encountered:

| Class | Description | Assessment ratio | Statute | | --- | --- | --- | --- | | Class 1 | Commercial, industrial, utility, mining | 16% | § 42-12001 | | Class 2(R) | Residential rental | 10% | § 42-12002 | | Class 3 | Owner-occupied primary residence | 10% | § 42-12003 | | Class 4 | Other residential (vacation, vacant residential) | 10% | § 42-12004 | | Class 6 | Historic, agricultural, foreign-trade-zone | 15% | § 42-12006 | | Class 7 | Railroad / mining producers' equipment | varies | § 42-12007 | | Class 8 | Producer / mining producer | 1% | § 42-12008 |

Class 1 was reduced from 18% to a phased final figure of 16% via SB1108 (2022), with the reduction phased through tax year 2027. The constant in this calculator uses the post-phase-in figure.

Why Class 3 owner-occupied primary residence is the most favorable

Class 3 carries a 10% assessment ratio — the same as Class 2(R) rental and Class 4 other residential — but the owner-occupied primary residence ALSO receives two benefits that no other class gets:

1. The primary residence property tax credit under § 42-17304 reduces the school-district portion of the bill.
2. The state aid for education homeowner rebate (A.R.S. § 15-972) reduces the school-district primary tax rate component by a state-funded subsidy.

Together these can reduce the effective tax rate on a Class 3 parcel by roughly 30–40% compared to the same parcel classified as Class 4 (e.g., a vacation home owned by an out-of-state buyer). Establishing primary residence requires the owner to actually occupy the property — typically demonstrated by Arizona driver's license, voter registration, vehicle registration, and Arizona tax return filed at the address. Reclassification from Class 4 to Class 3 is filed with the county assessor; the change takes effect for the following tax year.

Senior Valuation Protection (§ 42-13301)

Arizona's senior benefit is a valuation freeze, not a reduction. To qualify on the application date, the owner must meet ALL of:

• Age 65 or older
• Household income at or below the statutory limit — $48,000 (single) / $60,000 (MFJ) for tax year 2026 (indexed annually; $46,500/$58,200 for 2024)
• Owned and occupied the property as primary residence for at least two years

Once approved, LPV is locked at the base-year value. The freeze stops further growth — the 5% cap continues to operate against FCV, but the senior freeze can hold LPV below the cap-grown figure. Savings compound over time but are zero in year one of the freeze.

The freeze must be renewed every three years on a form filed with the county assessor. Missing the renewal terminates the freeze and resets LPV to the cap-grown figure. The freeze does NOT transfer when the owner moves — sale or change of residence terminates the freeze and the new property starts with current LPV.

A separate state income tax credit under A.R.S. § 43-1072.02 provides up to $502 (2025) for property tax paid on a primary residence, income-tested at $5,500 (very low — the credit is narrow but it stacks on top of the senior valuation protection freeze).

A worked example — $400,000 Phoenix primary residence, year 2

A $400,000 Phoenix home owned for two years. Owner is 40, not a senior. Prior-year LPV is $350,000 (a year-over-year rise that exceeded the 5% cap). Combined tax rate is 8% (representative for Maricopa County urban).

• 5% cap ceiling: $350,000 × 1.05 = $367,500
• FCV: $400,000
• Capped LPV: min($400,000, $367,500) = $367,500 (cap is binding)
• Class 3 ratio: 10%
• Assessed value: $367,500 × 0.10 = $36,750
• Tax owed: $36,750 × 0.080 = $2,940
• Effective rate: $2,940 / $400,000 = 0.735% of FCV

The 0.735% effective rate is well below the U.S. national average (~1.1%) and roughly half the Texas rate (~1.7%). Without the 5% cap, the tax on uncapped $400,000 FCV would have been $400,000 × 0.10 × 0.080 = $3,200 — so the cap saved $260 this year. The savings compound year over year as the LPV/FCV gap widens.

A worked example — same home, year 5 of ownership

Same home, now five years into the hold. FCV has risen with the market to $500,000. Prior-year LPV is $300,000 (the cap has bound every year). Same 8% combined rate.

• 5% cap ceiling: $300,000 × 1.05 = $315,000
• FCV: $500,000
• Capped LPV: min($500,000, $315,000) = $315,000 (cap heavily binding)
• Assessed value: $315,000 × 0.10 = $31,500
• Tax owed: $31,500 × 0.080 = $2,520
• Uncapped reference: $500,000 × 0.10 × 0.080 = $4,000
• Annual savings from the cap: $4,000 − $2,520 = $1,480

After five years of compounding the savings have grown to nearly $1,500 per year. A new buyer purchasing this home at the $500,000 FCV would have LPV = $500,000 in year one and would pay the full $4,000 — almost 60% more than the existing owner pays. The structural advantage to long-tenured owners is exactly what Proposition 117 was designed to produce.

A worked example — senior age 70, $40K income, freeze active

Same home, owner is now 70 years old with $40,000 of household income (single filer, well under the $48,000 limit). Owner applied for the senior valuation protection freeze five years ago when LPV was $250,000. The freeze locks LPV at the base-year value. Same 8% combined rate.

• Capped LPV (without freeze): $315,000 (the cap-grown figure)
• Senior freeze base-year LPV: $250,000
• Effective LPV: min($315,000, $250,000) = $250,000 (freeze binding)
• Assessed value: $250,000 × 0.10 = $25,000
• Tax owed: $25,000 × 0.080 = $2,000
• Effective rate: $2,000 / $500,000 = 0.40% of FCV

The senior pays $2,000 per year. Year over year the tax stays flat — assuming the combined rate doesn't change and the freeze is renewed every three years. The compounding savings vs the no-freeze baseline grow each subsequent year as the cap-grown LPV continues to rise toward FCV.

A worked example — $1M Class 1 commercial parcel

A $1,000,000 Phoenix commercial parcel. Prior-year LPV is $950,000 (the cap has bound for the last several years). Same 8% combined rate.

• 5% cap ceiling: $950,000 × 1.05 = $997,500
• FCV: $1,000,000
• Capped LPV: min($1,000,000, $997,500) = $997,500 (cap barely binding)
• Class 1 ratio: 16%
• Assessed value: $997,500 × 0.16 = $159,600
• Tax owed: $159,600 × 0.080 = $12,768
• Effective rate: $12,768 / $1,000,000 = 1.28% of FCV

The commercial parcel pays 1.28% — substantially higher than the 0.74% residential effective rate at the same FCV. The 1.6× spread between Class 1 (16%) and Class 3 (10%) assessment ratios is the structural feature of Arizona's class system. Commercial real-estate development in Arizona often relies on tax-increment financing, special improvement districts, and government property lease excise tax (GPLET) abatements to offset the assessment-ratio differential.

How Arizona compares to other state caps

| State | Annual cap | Applies to | Notes | | --- | --- | --- | --- | | California (Prop 13) | 2% assessed value | All real property | Full reassessment only on sale; most aggressive cap | | Florida (Save Our Homes) | 3% assessed value | Homestead only | Portability when owner moves | | Arizona (Prop 117) | 5% LPV | All real property | Two-tier FCV/LPV; senior freeze available | | Texas (§ 23.23) | 10% appraised value | Homestead only | Plus § 11.13 exemption stack | | Most Midwest / Northeast | none | n/a | Assessed value tracks market |

Arizona's 5% sits in the middle band. More protective than Texas's 10% on a per-year basis, less protective than California's 2% Prop 13. The combination of the 5% cap, the 10% Class 3 ratio, and the favorable urban combined rates of ~6–10% produces effective rates of roughly 0.6%–0.9% of FCV for owner-occupied primary residences — comfortably below the U.S. average.

Combined tax rate variation by county

Arizona combined tax rates are assembled district-by-district from overlapping taxing jurisdictions: county general fund + community college district + city or town + school district (primary and secondary rates) + special districts (fire, flood control, library, hospital). Typical combined rates by county:

• Maricopa County (Phoenix metro): ~6.5–8.5% combined; urban cores at the higher end
• Pima County (Tucson): ~7.5–8.5% — slightly higher than Maricopa
• Pinal County: ~7.5–9.5% — higher than the metros due to thinner non-residential base
• Yavapai (Prescott, Sedona): ~5.5–7.5%
• Coconino (Flagstaff, Sedona): ~6.5–8.5%
• Rural counties (Cochise, Greenlee, Apache, Navajo): highly variable, 5–11%

Pull the binding combined rate for the specific parcel from the county treasurer's annual tax certification. Most Arizona counties publish per-parcel breakdowns showing each district's contribution.

Common errors to avoid

• Using FCV instead of LPV for the tax computation. A common out-of-state-buyer error. The assessor's website prints both numbers; the tax basis is LPV (the smaller one), and you can be off by 20–40% on a long-tenured parcel if you use FCV by mistake.
• Forgetting that major improvements reset LPV. Pulling permits for a substantial remodel triggers an assessor re-inspection. The next year's LPV can jump to match the new FCV — a substantial single-year increase even though the 5% cap normally protects long-term owners.
• Confusing the senior freeze with a reduction. The freeze locks LPV at the base year; it does not reduce LPV. Savings are zero in year one and compound over time vs the cap-grown alternative.
• Missing the senior freeze three-year renewal. The freeze terminates if the renewal application isn't filed. Many seniors lose the freeze simply by forgetting to renew; LPV then resets to the cap-grown figure.
• Treating Class 3 as if the 10% ratio is the only benefit. The Class 3 designation also unlocks the primary residence property tax credit (§ 42-17304) and the school-tax homeowner rebate (§ 15-972), which together reduce effective rate by another 30–40% vs Class 4 at the same LPV.
• Assuming the cap applies to all property types. The 5% cap is constitutional and applies to all real property, but the cap RESETS on new construction, major improvements, and change of use. A Class 4 vacant lot converted to Class 1 commercial is reset; a Class 3 home with a new addition is reset.

Tools, not advice. Confirm the binding LPV figure from the county assessor's Notice of Value, the combined tax rate from the county treasurer, and senior valuation protection eligibility (income, age, two-year residency) with the county assessor before relying on any result for planning purposes.