Alabama Bonus Depreciation: Full Conformity, No Add-Back.
Alabama conforms to federal §168(k) bonus depreciation by rolling reference — for individuals and corporations alike. No add-back provision was found anywhere in the operative statute, and this page explains how that was actually checked rather than assumed.
Reviewed by Cost Seg Smart Editorial Team · Last verified against Code of Alabama, Title 40 Chapter 18 (official legislature system)
The 30-second answer: Alabama conforms to federal §168(k) bonus depreciation, for both individuals and corporations, with no add-back to track on the state return.
The individual deduction hook at Ala. Code §40-18-15(8) incorporates §§167 and 168 as they currently stand, with no date qualifier and no bonus carve-out. Corporate is even more direct: taxable income under §40-18-33 starts at federal taxable income, which already reflects any bonus claimed.
On a representative Alabama single-family rental (the single-family rental band we publish, 9–32% of depreciable basis reclassified, 16% representative), the reclassified components alone generate an estimated $18K–$165K of federal Year-1 depreciation — roughly $6,660–$61,570 of federal Year-1 tax savings at the 37% top bracket, and Alabama does not reduce it.
Federal vs Alabama, Side by Side
For an individual investor's or Alabama corporation's cost-segregation-reclassified components:
| Tax provision | Federal (IRC) | Alabama |
|---|---|---|
| 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 | Fully carried through. §40-18-15(8) incorporates §§167 and 168 with no date qualifier and no bonus carve-out (individual) |
| Corporate treatment | Federal taxable income reflects bonus claimed | Starts at federal taxable income. §40-18-33 — no separate add-back |
| Add-back required? | Not applicable | None. No §168(k) add-back found in Title 40, Chapter 18 |
| Federal usability of the deduction | Subject to passive activity, at-risk, basis, and business-interest limits | Same federal limits govern the federal deduction; Alabama adds no state-level reduction |
| MACRS asset class lives | 5 / 7 / 15 / 27.5 / 39 yr per Rev. Proc. 87-56 | Same class lives; the Alabama return simply carries the federal figures through |
Source: Code of Alabama, Title 40 Chapter 18 (official legislature system); IRC §168(k). Federal bonus figures reflect current law; eligibility depends on acquisition and placed-in-service dates and elections.
How Alabama's conformity was actually checked
A rolling-conformity label alone is not enough to build a page on — several states use identical-sounding conformity language while carrying a separate add-back buried elsewhere in the code. Alabama's individual deduction hook, §40-18-15(8), was read directly: it incorporates 26 U.S.C. §§167 and 168 as they stand today, with no date qualifier limiting which version of the Code applies, and no carve-out excluding subsection (k).
The whole income tax chapter was then searched for "168" and "bonus depreciation" specifically to rule out a hidden add-back — the same trap that catches a keyword search in Missouri, Nebraska, and Oklahoma, where an old, expired provision reads like current decoupling. No such provision exists here. On the corporate side, §40-18-33 starts taxable income directly from the federal taxable income figure, which already nets out whatever depreciation — bonus included — was claimed federally.
Sourced from the official Alabama Legislature code system, after the usual third-party statute mirrors returned blocked or unreliable pages this session.
Illustrative numbers: an Alabama single-family rental
Using the single-family residential (SFR) band we publish — 9–32% of depreciable basis reclassified into 5/7/15-year property, 16% representative — on a property priced between $250,000 and $650,000, with a 20% residential land allocation, and 100% federal bonus depreciation for eligible components under current law:
| Line item | Federal | Alabama |
|---|---|---|
| Purchase price band | $250,000–$650,000 | Same property |
| Depreciable basis (20% land allocation) | $200,000–$520,000 | Same basis, no state adjustment |
| Reclassified to 5/7/15-yr (9–32% of basis) | $18K–$165K | Carried through in full |
| Year-1 treatment | $18K–$165K deducted (100% bonus, if eligible) | Same $18K–$165K deducted, no add-back |
| Marginal tax rate | Up to 37% | Alabama individual income tax rate (verify current year with the Alabama Department of Revenue) |
| Illustrative Year-1 federal tax savings on reclassified components | ~$6,660–$61,570 (37% × $18K–$165K) | Full deduction carries through; no state-level reduction |
Figures are illustrative and use the site's published SFR reclassification band; your result depends on your basis, land allocation, bracket, component mix, and eligibility. Whether the full federal deduction is usable in the current year still depends on your passive-loss, at-risk, basis, and business-interest situation.
See a sample cost segregation report
Look at exactly what your Alabama 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 Alabama property
Because Alabama conforms with no add-back, the workflow is simpler than a decoupled state — there is no state-side addition or later subtraction to track over multiple years:
- Federal Form 4562: depreciation and amortization, including the §168(k) bonus deduction on eligible reclassified components. Flows to Schedule E (rental), Schedule C (active business), or the applicable corporate return.
- 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.
- Alabama individual or corporate return: the federal figures carry through directly — no add-back line, and nothing to track in later years.
- 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; Alabama simply does not require a second calculation.
Form 3115 lookback on an Alabama 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. Because Alabama conforms with no add-back, the catch-up carries through to the Alabama return unchanged, the same way an ordinary Year-1 bonus would.
See our full Form 3115 cost segregation guide for federal mechanics, partnership and LLC pass-through treatment, and timing rules.
Should you do cost segregation in Alabama? Usually yes.
Alabama is one of the cleaner states in this series for a property owner, for three reasons:
- Full conformity, individual and corporate alike. The federal §168(k) bonus flows straight through, with no add-back to track and no later subtraction schedule to manage.
- Verified against the operative sections, not the conformity date alone. Both the individual deduction hook and the corporate starting point were checked directly for a hidden add-back, and none was found.
- The Form 3115 lookback still captures missed federal 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 a federal one, not an Alabama one: whether the full federal deduction is usable in the current year still depends on your passive-loss, at-risk, basis, and business-interest situation — Alabama itself adds no separate limitation.
Frequently asked
Does Alabama allow bonus depreciation?
Yes. Alabama conforms by rolling reference. The individual deduction hook at Ala. Code §40-18-15(8) incorporates 26 U.S.C. §§167 and 168 as they currently stand, with no date qualifier and no bonus carve-out, so current federal §168(k) bonus depreciation (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) carries through to the Alabama individual return automatically.
Does Alabama treat corporations differently from individuals for bonus depreciation?
No — if anything the corporate route is more direct. Corporate taxable income under §40-18-33 begins at federal taxable income itself, which already reflects whatever bonus depreciation was claimed on the federal return. There is no separate Alabama corporate add-back to check.
How was Alabama's conformity actually verified, rather than assumed?
By reading the operative deduction and modification sections directly rather than inferring from a rolling-conformity label. The whole Alabama income tax chapter (Title 40, Chapter 18) was searched for "168" and "bonus depreciation" and no add-back provision was found anywhere — for either the individual deduction hook or the corporate starting-point definition. Sourced from the official Alabama Legislature code system after the usual third-party statute mirrors were blocked.
Is cost segregation still worth it in Alabama?
Yes, and Alabama does not blunt the benefit the way a decoupled state does. The federal §168(k) bonus flows straight through to both the individual and corporate Alabama return, with no state-level add-back to track and no later state subtraction schedule to manage. Whether the full federal deduction is usable in the current year still depends on federal passive-activity, at-risk, basis, and business-interest limits — those are federal questions, not Alabama-specific ones.
Can I use Form 3115 on an Alabama 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. Because Alabama conforms with no add-back, the catch-up amount carries through to the Alabama return the same way an ordinary Year-1 bonus would.
What does an Alabama 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), and Alabama's rolling conformity carries that same bonus through to the state return with no add-back. The engine ships our own calibrated, nationally-recognized construction cost data.
Related guides
- Bonus depreciation by state: overview
- All 50 states: conformity reference table
- Utah bonus depreciation (conforms, rolling reference)
- Tennessee bonus depreciation (no state income tax)
- Georgia bonus depreciation (decoupled)
- Form 3115 cost segregation lookback: §481(a) mechanics
- What is cost segregation: the full primer
- Sample cost segregation reports