Arizona Bonus Depreciation: State Add-Back, Federal Benefit Intact.
Arizona does not conform to federal §168(k) bonus depreciation. An individual Arizona investor still claims the full federal Year-1 bonus, but for Arizona income tax the federal bonus is added back under A.R.S. §43-1021 and the reclassified basis is recovered over the asset's normal 5, 7, and 15-year lives rather than expensed in Year 1. That is a timing difference, not a lost deduction, and current-year federal usability still depends on passive-activity, at-risk, basis, and business-interest limits.
Reviewed by Cost Seg Smart Editorial Team · Last reviewed: · Cites A.R.S. §43-1021, Arizona Department of Revenue
The 30-second answer: Arizona does not conform to federal §168(k) bonus depreciation. An individual still claims the full federal Year-1 bonus on the federal return, but for Arizona income tax the federal bonus is added back under A.R.S. §43-1021 and the reclassified basis is recovered over the normal 5, 7, and 15-year lives, not expensed in Year 1.
On a $750K Arizona rental with $600K depreciable basis and 18.3% reclassified to shorter-life property, the reclassified components generate about $109,800 of federal Year-1 depreciation. At a 37% federal bracket, that is about $40,600 of federal savings from the reclassified components alone; including regular depreciation on the remaining building basis, total illustrative Year-1 federal savings are about $43,900.
Cost seg still helps at the Arizona level, because it moves basis into the shorter 5, 7, and 15-year lives (faster Arizona recovery), just without the Year-1 bonus. At Arizona's flat 2.5% rate the state-side timing effect is modest, and current-year federal usability still depends on passive-loss, at-risk, basis, and business-interest limits.
Federal vs Arizona, Side by Side
For an individual investor's cost-segregation-reclassified components:
| Tax provision | Federal (IRC) | Arizona |
|---|---|---|
| Bonus depreciation under §168(k) | 100% may apply to qualified property acquired and placed in service after January 19, 2025, subject to §168(k) eligibility, related-party/prior-use, binding-contract, and election rules | No Year-1 bonus. Arizona does not conform to §168(k); the federal bonus is added back and the reclassified basis recovers over the normal MACRS lives |
| Income tax on rental income | Ordinary rates, up to 37% | Flat 2.5% on net income from rental real estate (effective for tax year 2023 and after) |
| State depreciation treatment of reclassified basis | Year-1 bonus on eligible components, then MACRS on the remainder | Recovered over the 5, 7, and 15-year lives for Arizona; faster than 27.5/39-year, but no Year-1 bonus (a timing difference) |
| Federal usability of the deduction | Subject to passive activity, at-risk, basis, and business-interest limits | Same federal limits govern the federal deduction; Arizona applies its own flat 2.5% at the state level |
| MACRS asset class lives | 5 / 7 / 15 / 27.5 / 39 yr per Rev. Proc. 87-56 | Reclassified components recover over the shorter 5 / 7 / 15-year lives for Arizona |
| Arizona bonus add-back (A.R.S. §43-1021) | Not applicable | Requires an add-back of the federal §168(k) bonus, then recovery of the basis over the normal MACRS lives |
| Depreciation form the individual files | Form 4562 → Schedule E (rental) or Schedule C (active business) | Arizona Form 140 with the §168(k) bonus added back, recovering basis over the normal lives without the Year-1 bonus |
Sources: A.R.S. §43-1021, Arizona Department of Revenue, IRC §168(k). Federal bonus figures reflect current law; eligibility depends on acquisition and placed-in-service dates and elections.
How Arizona's non-conformity affects your cost segregation study
The study itself does not change. The same engineering-based reclassification, using nationally-recognized 2026 construction cost data, MACRS classification per Rev. Proc. 87-56, and IRS Pub 5653 ATG-aligned documentation, produces the same component schedule whether the property sits in Arizona, Texas, or anywhere else. What changes is what happens at the state level: for Arizona, the federal §168(k) bonus is added back under A.R.S. §43-1021, so the reclassified basis is recovered over the normal 5, 7, and 15-year lives rather than expensed in Year 1.
Your CPA receives the same Cost Seg Smart engineered report, the same Form 4562-ready schedule, and the same Form 3115 §481(a) section if this is a lookback study. The components then run through two calculations:
- Federal book: bonus depreciation on eligible 5/7/15-year components in Year 1, plus half-year-convention MACRS on the 27.5-year residential (or 39-year commercial) remainder, subject to the federal passive-loss, at-risk, basis, and business-interest limits.
- Arizona book: the federal bonus is added back, so the same reclassified components recover over the 5, 7, and 15-year lives, which is still faster than leaving that basis in the 27.5-year or 39-year shell. At Arizona's flat 2.5% rate, the state-side timing benefit is modest.
The practical point is that cost segregation still helps in Arizona on both fronts: the full federal Year-1 bonus is claimed on the federal return, and for Arizona the reclassified basis recovers faster because it sits in the shorter 5, 7, and 15-year lives. How much of the federal deduction you actually use in the current year still depends on your passive-loss, at-risk, basis, and business-interest situation.
Illustrative numbers: $750K Arizona rental
An illustrative example using the Cost Seg Smart residential benchmark (SFR reclass 18.3%) and 100% federal bonus depreciation for eligible components under current law. Headline dollar figures are federal; the Arizona column is described qualitatively because Arizona adds back the federal bonus and recovers the reclassified basis over the asset lives rather than in Year 1:
| Line item | Federal | Arizona |
|---|---|---|
| Purchase price | $750,000 | $750,000 |
| Land allocation (20%) | $150,000 | $150,000 |
| Depreciable basis | $600,000 | $600,000 |
| Reclassified to 5/7/15-yr (18.3% SFR benchmark) | $109,800 | $109,800 |
| Year-1 deduction on reclassified components | $109,800 (100% bonus, if eligible) | No Year-1 bonus; the $109,800 is added back and recovers over 5, 7, and 15-year lives (faster than 27.5-year) |
| Federal savings from reclassified components alone | ~$40,600 (37% × $109,800) | Arizona benefit spread over the 5, 7, and 15-year lives; modest at the flat 2.5% rate |
| Year-1 depreciation on remaining 27.5-yr basis | ~$8,909 | Same 27.5-year recovery on the remaining shell basis |
| Total Year-1 federal depreciation | ~$118,700 | Recovery spread over the asset lives for Arizona |
| Marginal tax rate | 37% | Flat 2.5% (effective for tax year 2023 and after) |
| Illustrative Year-1 federal tax savings | ~$43,900 (37% × ~$118,700) | Faster Arizona recovery of the reclassified basis; state timing benefit modest at 2.5% |
| Cost Seg Smart study cost | $995 (residential under $1M basis) | |
| ROI on $995 study fee (illustrative, federal savings) | ~44× | |
The headline dollars above are federal. For Arizona the federal bonus is added back, so the reclassified basis is recovered over the 5, 7, and 15-year lives, which is still faster than the 27.5-year shell, and at the flat 2.5% rate the state timing benefit is modest. Whether the full federal deduction is usable in the current year depends on your passive-loss, at-risk, basis, and business-interest situation. Figures are illustrative; your result depends on basis, land allocation, bracket, and eligibility.
See a sample cost segregation report
Look at exactly what your Arizona study delivers: the component-by-component 5/7/15-year schedule, the Form 4562-ready numbers, and the documentation your CPA files. Real reports are our best answer to "is this legit?"
Forms your CPA files for an Arizona property
For an individual Arizona investor, the workflow runs on both the federal return and the Arizona return, because Arizona does tax rental income at a flat 2.5%:
- Federal Form 4562: depreciation and amortization, including the §168(k) bonus deduction on eligible reclassified components. Flows to Schedule E (rental) or Schedule C (active business).
- Schedule E (or Schedule C): the accelerated federal deduction reduces federal taxable income in Year 1, subject to the federal passive-loss, at-risk, basis, and business-interest limits.
- Arizona Form 140: net rental income for Arizona. The federal §168(k) bonus is added back under A.R.S. §43-1021, so the reclassified basis recovers over the 5, 7, and 15-year lives, taxed at the flat 2.5% rate.
- Form 3115 §481(a) section: included only if this is a federal lookback method change on a property placed in service in a prior year (see below).
The reclassified schedule is the same engineered output for both books; the difference is that federal claims the Year-1 bonus while Arizona adds it back and recovers the same basis over the shorter class lives.
Form 3115 lookback on an Arizona property
If the property was placed in service in a prior tax year and depreciation was reported using a non-segregated method, a federal Form 3115 (Application for Change in Accounting Method) may allow a current-year §481(a) catch-up adjustment for the accelerated depreciation you missed, generally without amending prior returns. This is often the single biggest acceleration mechanism in cost segregation. Any catch-up dollars are illustrative and depend on placed-in-service date, prior depreciation claimed, bonus eligibility, land allocation, and component mix.
The federal §481(a) catch-up is the primary lever, and it remains subject to the federal passive-loss, at-risk, and basis limits. For Arizona, the effect follows Arizona's own recovery of the reclassified basis over the 5, 7, and 15-year lives after the federal bonus is added back, so the Arizona-side timing benefit is modest at the flat 2.5% rate.
See our full Form 3115 cost segregation guide for federal mechanics, partnership and LLC pass-through treatment, and timing rules.
Should you skip cost segregation in Arizona? No.
Arizona's non-conformity changes the timing of the state-side benefit, not the fundamental economics. The math still favors doing the study, for three reasons:
- The full federal Year-1 bonus is intact. Arizona does not reduce the federal deduction; the full §168(k) bonus is claimed on the federal return. How much you use in the current year still depends on your passive-loss, at-risk, basis, and business-interest situation.
- Cost seg still accelerates Arizona recovery. For Arizona there is no Year-1 bonus, but moving basis into the shorter 5, 7, and 15-year lives still recovers it faster than leaving it in the 27.5-year or 39-year shell. At the flat 2.5% rate, that state timing benefit is modest but real.
- The Form 3115 lookback captures missed years. If the property was placed in service in a prior year and depreciated without cost segregation, the federal §481(a) catch-up may be available, generally without amending prior returns.
The nuance to flag with your CPA is the mechanics of the Arizona add-back under A.R.S. §43-1021: the federal §168(k) bonus is added back and the reclassified basis recovers over the normal MACRS lives for Arizona. The federal benefit remains the dominant driver, subject to the taxpayer's passive-loss, at-risk, and basis situation.
Frequently asked
Does Arizona conform to bonus depreciation?
No. Arizona does not conform to federal §168(k) bonus depreciation. An individual investor still claims the full federal Year-1 bonus on the federal return (100% may apply to qualified property acquired and placed in service after January 19, 2025, subject to §168(k) eligibility, related-party/prior-use, binding-contract, and election rules), but for Arizona income tax the federal bonus is added back under A.R.S. §43-1021, and the reclassified basis is recovered over the asset's normal depreciation life under regular MACRS instead of as a Year-1 bonus. That is a timing difference, not a lost deduction.
Does Arizona tax my rental income?
Yes. Arizona imposes a flat individual income tax of 2.5% (effective for tax year 2023 and after), and it taxes net income from rental real estate. So unlike a no-income-tax state, an Arizona investor does have a state return on which depreciation matters. The flat 2.5% rate is low relative to the federal bracket, which is why the Arizona-side timing of the deduction is modest compared with the federal Year-1 benefit.
How does the Arizona add-back work for a cost segregation study?
The study is the same everywhere: the engineering-based reclassification moves building components into shorter MACRS class lives (5, 7, and 15-year) per Rev. Proc. 87-56. On the federal return, eligible reclassified components may take 100% §168(k) bonus in Year 1. For Arizona, the federal bonus is added back under A.R.S. §43-1021, so the same reclassified basis is recovered over the 5, 7, and 15-year lives rather than expensed up front. Cost seg still helps at the Arizona level, because it moves basis out of the 27.5-year (residential) or 39-year (commercial) shell and into the shorter 5, 7, and 15-year lives, which recover faster for Arizona income tax. You keep the full federal Year-1 benefit and gain faster Arizona recovery, just without an Arizona Year-1 bonus.
Is cost segregation still worth it in Arizona?
In nearly every case, yes. The federal Year-1 benefit is overwhelmingly the dominant driver, and Arizona does not reduce it: the full federal bonus is claimed on the federal return. At the Arizona level, cost segregation still accelerates recovery by shifting basis into the shorter 5, 7, and 15-year lives, and at Arizona's flat 2.5% rate the state-side timing effect is modest either way. On a $750,000 rental with a $600,000 depreciable basis and 18.3% reclassified, roughly $109,800 moves into shorter-life property; at a 37% federal bracket that is about $40,600 of federal savings from the reclassified components alone, with total illustrative Year-1 federal savings of about $43,900. Whether you can use the full federal deduction in the current year still depends on federal passive-activity, at-risk, basis, and business-interest limits.
Can I use Form 3115 on an Arizona property I bought years ago?
Often, yes, at the federal level. If the property was placed in service in a prior tax year and depreciation was reported using a non-segregated method, a federal Form 3115 (Application for Change in Accounting Method) may allow a current-year §481(a) catch-up for the accelerated depreciation you missed, generally without amending prior returns. Any catch-up dollars are illustrative and depend on placed-in-service date, prior depreciation, bonus eligibility, land allocation, and component mix. The federal §481(a) mechanics are the primary lever; the Arizona effect follows Arizona's own recovery of the reclassified basis over the 5, 7, and 15-year lives after the federal bonus is added back.
What is Arizona's income tax rate on rental income?
Arizona levies a flat individual income tax of 2.5% (effective for tax year 2023 and after), and it applies to net rental real estate income. There are no graduated brackets: the same 2.5% applies regardless of income level. Because the rate is flat and low, the state-side depreciation timing question is modest relative to the federal deduction, where ordinary rates can reach 37%.
What does an Arizona cost segregation study rely on for its numbers?
The study reclassifies building components into IRS-recognized MACRS class lives (5, 7, and 15-year) per Rev. Proc. 87-56, using an engineering-based methodology that follows the IRS Cost Segregation Audit Techniques Guide (Publication 5653). The reclassified components may then qualify for federal §168(k) bonus depreciation on the federal return (100% for qualified property acquired and placed in service after January 19, 2025, subject to eligibility and election rules), while for Arizona the federal bonus is added back and the same components recover over the 5, 7, and 15-year lives. The engine ships our own calibrated, nationally-recognized construction cost data.
Related guides
- Bonus depreciation by state: overview
- All 50 states: conformity reference table
- California bonus depreciation (non-conforming)
- Pennsylvania bonus depreciation (non-conforming)
- Texas bonus depreciation (no state income tax)
- Form 3115 cost segregation lookback: §481(a) mechanics
- What is cost segregation: the full primer
- Cost segregation in Arizona: market and property examples
- Sample cost segregation reports