Indiana Bonus Depreciation: Decoupled Since 2002, Deferred Not Lost.
Indiana has been decoupled since 2002 from both federal §168(k) bonus depreciation and §179 expensing. An individual Indiana investor still claims the full federal Year-1 bonus, but for Indiana adjusted gross income tax the federal bonus is added back and Indiana AGI is recomputed as if the §168(k) election had not been made — recovered through negative adjustments in later years rather than lost.
Reviewed by Cost Seg Smart Editorial Team · Last verified against IN DOR Income Tax Information Bulletin #118 (May 2026), IN DOR — Indiana add-backs
The 30-second answer: Indiana has been decoupled since 2002 from both federal §168(k) bonus depreciation and §179 expensing. An individual claims the full federal Year-1 bonus on the federal return, but for Indiana adjusted gross income tax, that bonus is added back and Indiana AGI is recomputed as if the §168(k) election had not been made.
This is a timing difference, not a lost deduction. Indiana's own Department of Revenue guidance (Information Bulletin #118, May 2026) states the add-back "will result in a first-year add-back for an item of property followed by negative adjustments in subsequent years except in uncommon circumstances." The same mechanism applies to individual AGI, corporate AGI, and financial institutions under IC 6-5.5. Senate Enrolled Act 243 (2026) extended it to qualified production property under federal H.R. 1.
On a representative Indiana 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, with the Indiana portion added back in Year 1 and recovered through negative adjustments afterward.
Federal vs Indiana, Side by Side
For an individual investor's cost-segregation-reclassified components:
| Tax provision | Federal (IRC) | Indiana |
|---|---|---|
| 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 | Added back. Decoupled since 2002; Indiana AGI recomputed as if §168(k) had not been elected |
| §179 expensing | Federal §179 limits apply | Also decoupled. Federal and Indiana §179 allowances differ; a separate Indiana add-back applies |
| Recovery of the added-back amount | Not applicable | First-year add-back, then negative adjustments in subsequent years "except in uncommon circumstances" (IN DOR Bulletin #118) — deferred, not lost |
| Who the add-back applies to | Not applicable | Individual AGI, corporate AGI, and financial institutions under IC 6-5.5 |
| Qualified production property (H.R. 1 / P.L. 119-21) | New federal bonus-eligible category | Decoupling extended to this category by Senate Enrolled Act 243 (2026) |
| Federal usability of the deduction | Subject to passive activity, at-risk, basis, and business-interest limits | Same federal limits govern the federal deduction; Indiana's add-back/negative-adjustment cycle applies independently |
| MACRS asset class lives | 5 / 7 / 15 / 27.5 / 39 yr per Rev. Proc. 87-56 | Same class lives; Indiana AGI is recomputed against them once the §168(k) election is treated as not made |
Sources: IN DOR Information Bulletin #118 (May 2026), IN DOR — Indiana add-backs, IRC §168(k). Citations: IC 6-3-1-3.5; IC 6-3-1-33; IC 6-3-2-29. Federal bonus figures reflect current law; eligibility depends on acquisition and placed-in-service dates and elections.
How the Indiana add-back actually works
The study itself does not change. The same engineering-based reclassification, using nationally-recognized 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 Indiana or anywhere else. What changes is what happens on the Indiana return: the taxpayer adds back the federal bonus depreciation deduction and recomputes Indiana adjusted gross income as if the §168(k) election had not been made.
Indiana's Department of Revenue is direct about the practical result, in Information Bulletin #118 (May 2026): the mechanism "will result in a first-year add-back for an item of property followed by negative adjustments in subsequent years except in uncommon circumstances." In other words, Year 1 shows more Indiana income than the federal return because the bonus is added back, and later years show less Indiana income than the federal return as the negative adjustments run — recovering the same reclassified basis over time rather than losing it.
This has applied since 2002, to both bonus depreciation and §179 expensing, and it applies the same way regardless of taxpayer type: individual adjusted gross income tax, corporate adjusted gross income tax, and financial institutions under IC 6-5.5 all use the same add-back-then-recover mechanism.
Your CPA receives the same Cost Seg Smart engineered report, the same Form 4562-ready federal schedule, and the same Form 3115 §481(a) section if this is a lookback study. The Indiana add-back and its later negative adjustments are then computed from that same schedule.
Indiana's 2026 update: Information Bulletin #118 and Senate Enrolled Act 243
Indiana Department of Revenue's Income Tax Information Bulletin #118 was published in May 2026 and is effective retroactively to July 4, 2025, replacing the prior bulletin from March 2023. It restates that Indiana "has largely decoupled from the federal allowances for bonus depreciation and Section 179 expensing" — a position that has held since 2002, not a new policy.
Separately, Senate Enrolled Act 243 (2026) extended Indiana's decoupling to qualified production property created under federal H.R. 1 (P.L. 119-21). A property owner claiming this newer federal bonus category should expect the same Indiana add-back-then-negative-adjustment treatment that applies to ordinary §168(k) bonus-eligible components.
Neither change alters the underlying mechanism described above; both confirm and extend it. This page will be updated if the record in the 50-state conformity table changes.
Illustrative numbers: an Indiana 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. The Indiana column is described qualitatively because Indiana adds back the federal bonus and recovers it through negative adjustments rather than a Year-1 deduction:
| Line item | Federal | Indiana |
|---|---|---|
| Purchase price band | $250,000–$650,000 | Same property |
| Depreciable basis (20% land allocation) | $200,000–$520,000 | Same basis before the add-back |
| Reclassified to 5/7/15-yr (9–32% of basis) | $18K–$165K | Same dollars, added back in Year 1 |
| Year-1 treatment | $18K–$165K deducted (100% bonus, if eligible) | Added back to Indiana AGI in full |
| Later-year treatment | Not applicable (already deducted) | Negative adjustments recover the same basis over subsequent years |
| Marginal tax rate | Up to 37% | Indiana adjusted gross income tax rate (verify current year with IN DOR) |
| Illustrative Year-1 federal tax savings on reclassified components | ~$6,660–$61,570 (37% × $18K–$165K) | Deferred to later years via negative adjustments, not lost |
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. The Indiana add-back and its later negative adjustments should be modeled by your CPA against the specific years the property is held.
See a sample cost segregation report
Look at exactly what your Indiana 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 Indiana property
For an individual Indiana investor, the workflow runs on both the federal return and the Indiana return, because Indiana's add-back and negative-adjustment mechanism has to be tracked over multiple years:
- 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.
- Indiana adjusted gross income tax return: the federal bonus depreciation deduction (and any federal §179 amount) is added back to recompute Indiana AGI as if the election had not been made, per IC 6-3-1-3.5, IC 6-3-1-33, and IC 6-3-2-29.
- Negative adjustments in subsequent years: Indiana recovers the added-back basis over the years that follow, per IN DOR Information Bulletin #118 — this has to be tracked on the Indiana return until the basis is fully recovered.
- 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 Indiana adds it back in Year 1 and recovers it through negative adjustments afterward.
Form 3115 lookback on an Indiana 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 Indiana, the catch-up year's bonus-eligible amount is added back the same way an ordinary Year-1 bonus would be, and recovered through negative adjustments in the years that follow, per IN DOR Information Bulletin #118.
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 Indiana? No.
Indiana's decoupling 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. Indiana 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.
- Indiana defers the benefit, it does not eliminate it. The add-back in Year 1 is followed by negative adjustments in later years "except in uncommon circumstances" (IN DOR Bulletin #118), so the same reclassified basis is still recovered on the Indiana return over time.
- 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 that Indiana's mechanism runs over multiple years: the first-year add-back and the negative adjustments that follow both need to be tracked on the Indiana return for as long as the reclassified basis is being recovered, whether the taxpayer is an individual, a corporation, or a financial institution under IC 6-5.5.
Frequently asked
Does Indiana conform to bonus depreciation?
No. Indiana has been decoupled since 2002 from both federal §168(k) bonus depreciation and §179 expensing. 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 Indiana adjusted gross income tax, the federal bonus is added back and Indiana AGI is recomputed as if the §168(k) election had not been made.
How does the Indiana bonus depreciation add-back actually work?
The taxpayer adds back the federal bonus depreciation deduction and recomputes Indiana adjusted gross income as if the §168(k) election had not been made. Indiana's Department of Revenue describes the practical effect directly: this "will result in a first-year add-back for an item of property followed by negative adjustments in subsequent years except in uncommon circumstances." In plain terms, the deduction is deferred, not lost — Indiana recovers the same reclassified basis through negative adjustments (subtractions from income) over the years that follow the add-back year.
Does Indiana also decouple from Section 179 expensing?
Yes. Indiana's decoupling covers both federal bonus depreciation under §168(k) and §179 expensing, and it has applied to both since 2002. The federal and Indiana Section 179 allowances differ as a result, so a property owner using §179 alongside a cost segregation study should expect a separate Indiana add-back for the §179 amount as well, following the same fixed-conformity mechanism.
Who does the Indiana add-back apply to — just individuals?
No. The same add-back mechanism applies to individual adjusted gross income tax, to the corporate adjusted gross income tax, and to financial institutions under IC 6-5.5. Whether the taxpayer is an individual investor, a corporation, or a financial institution, the federal §168(k) bonus (and the federal §179 deduction) is added back and recovered through Indiana's own recomputation rather than allowed as claimed federally.
What changed for Indiana bonus depreciation in 2026?
Two things, both already enacted. Indiana DOR's Information Bulletin #118 was published in May 2026, effective retroactively to July 4, 2025, replacing the prior bulletin from March 2023 — it restates that Indiana "has largely decoupled from the federal allowances for bonus depreciation and Section 179 expensing" since 2002. Separately, Senate Enrolled Act 243 (2026) extended Indiana's decoupling to qualified production property created under federal H.R. 1 (P.L. 119-21), so that new federal category is added back on the same basis as ordinary bonus-eligible property.
Is cost segregation still worth it in Indiana?
In nearly every case, yes. The federal Year-1 benefit is overwhelmingly the dominant driver, and Indiana does not reduce it: the full federal bonus is claimed on the federal return. At the Indiana level, the add-back defers rather than eliminates the benefit — Indiana's own guidance describes a first-year add-back followed by negative adjustments in later years, so the reclassified basis is still recovered, just on Indiana's own schedule rather than in Year 1. 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 Indiana 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 Indiana effect follows the same add-back-then-negative-adjustment mechanism described above, applied to the catch-up year.
What does an Indiana 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 Indiana adjusted gross income tax the federal bonus is added back and recovered through negative adjustments in later years. The engine ships our own calibrated, nationally-recognized construction cost data.
Related guides
- Bonus depreciation by state: overview
- All 50 states: conformity reference table
- Washington bonus depreciation (no income tax today, B&O caveats)
- Virginia bonus depreciation (decoupled)
- Arizona bonus depreciation (decoupled)
- Form 3115 cost segregation lookback: §481(a) mechanics
- What is cost segregation: the full primer
- Sample cost segregation reports