The Indiana bonus depreciation add-back requires you to reverse the federal first-year write-off on your state return and spread the deduction across the asset’s normal recovery period instead. Indiana has been decoupled from federal bonus depreciation since 2002, and the state moved to keep that decoupling in place after Congress restored 100% expensing permanently in 2025. You do not lose the deduction; you lose the timing. The full cost still comes off your Indiana income eventually, but through regular MACRS depreciation rather than a single year one deduction.
How the Add-Back Works
Under Indiana Code 6-3-1-3.5, you must compute your Indiana adjusted gross income as though you had never elected bonus depreciation.1Indiana General Assembly. Indiana Code 6-3-1-3.5 – Adjusted Gross Income The rule applies to individuals, corporations, trusts, estates, and insurance companies.
In year one, you add back the difference between what you claimed federally and what regular MACRS would have allowed. In each following year of the asset’s recovery period, you subtract the MACRS depreciation that Indiana recognizes but federal returns no longer show, because federally the asset was already fully expensed. These adjustments go on your Indiana return under Code 104.2Indiana Department of Revenue. Bonus Depreciation and Section 179 Expensing Treatment for Indiana Income Tax Purposes
The recovery period follows regular MACRS class lives, not a flat five-year split. Five-year property runs across six tax years under the half-year convention. Seven-year property spans eight. Qualified improvement property and other fifteen-year assets take longer still. By the end of the schedule, cumulative Indiana deductions match the federal deduction dollar for dollar.
Why 2025 Made the Add-Back Bigger
The One, Big, Beautiful Bill Act, signed on July 4, 2025, permanently restored 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025.3Internal Revenue Service. One, Big, Beautiful Bill Provisions The old phase-down toward zero by 2027 is off the table, and Congress created a new provision, Section 168(n), for qualified production property alongside the existing Section 168(k).
Indiana responded through Senate Bill 243, effective the same date, extending the state’s decoupling to Section 168(n) as well. The result on the ground: a larger federal deduction produces a larger Indiana add-back. When the federal rate had dropped to 60% or 40%, the state adjustment was proportionally smaller. Now the full cost of every qualifying asset triggers the add-back.
Section 179 Is Where the Bigger Surprise Lives
Federal Section 179 expensing for 2026 allows up to $2,560,000, with a phase-out beginning at $4,090,000 in total equipment purchases. Indiana caps the Section 179 deduction at $25,000.2Indiana Department of Revenue. Bonus Depreciation and Section 179 Expensing Treatment for Indiana Income Tax Purposes The gap is enormous, and it catches business owners more often than the bonus depreciation issue does.
Expense $200,000 of equipment under Section 179 federally, and Indiana allows only $25,000. You add back the $175,000 difference and depreciate that amount under regular MACRS for state purposes. These adjustments use Code 105 rather than Code 104. Indiana does follow the federal phase-out threshold, so the $25,000 cap begins reducing dollar for dollar once total equipment purchases exceed the federal phase-out amount.
What the Add-Back Costs You
Indiana’s corporate adjusted gross income tax rate is 4.9% for 2026, and the individual income tax rate is 2.95%.4Indiana Department of Revenue. Rates Fees and Penalties On a $1,000,000 equipment purchase fully expensed federally, a C-corporation faces roughly $49,000 in extra Indiana tax in year one, before the small regular first-year MACRS deduction the state allows. A pass-through owner sees closer to $29,500 at the individual rate.
The money returns over the recovery period through the annual MACRS subtractions. Time value of money still bites: a dollar paid today is worth more than a dollar refunded across the next six years. Most Indiana counties impose their own income tax that piggybacks on adjusted gross income, so the add-back can also raise your county tax liability in the acquisition year.
If you made the purchase decision based on the federal write-off without modeling the state impact, the acquisition-year squeeze is real. Build the timing mismatch into cash-flow projections before signing a purchase order.
Selling the Asset Before Recovery Ends
If you sell or dispose of the asset before Indiana’s depreciation catches up, you do not forfeit the remaining deductions. You claim the unrecovered amount in the year of disposition. Calculate the difference between total federal depreciation and total Indiana depreciation taken through the sale date, and report that difference as a negative adjustment under Code 104 for bonus depreciation or Code 105 for Section 179.2Indiana Department of Revenue. Bonus Depreciation and Section 179 Expensing Treatment for Indiana Income Tax Purposes
The IT-20 Corporate Income Tax Booklet requires taxpayers to enclose a statement explaining the adjustment when previously disallowed depreciation is recovered upon disposition.5Indiana Department of Revenue. IT-20 Corporate Income Tax Booklet 2024 You need to reconstruct the Indiana-specific depreciation history for the asset, so clean records matter here more than in most areas of the return.
Pass-Through Entities
Partnerships and S-corporations that elect bonus depreciation federally compute the Indiana adjustment at the entity level and flow it through to owners on the Indiana Schedule K-1. The entity’s treatment controls; individual partners and shareholders cannot make a different election on their personal returns.2Indiana Department of Revenue. Bonus Depreciation and Section 179 Expensing Treatment for Indiana Income Tax Purposes
Indiana’s elective pass-through entity tax, available for tax years beginning on or after January 1, 2022, imposes the adjusted gross income tax at the entity level. Electing entities still compute Indiana AGI under IC 6-3-1 through 6-3-7, so the bonus depreciation and Section 179 add-backs apply the same way.1Indiana General Assembly. Indiana Code 6-3-1-3.5 – Adjusted Gross Income The election changes who writes the check, not how the depreciation math works.
Records You Need to Keep
Indiana Code 6-8.1-5-4 requires taxpayers to keep books and records sufficient for the Department of Revenue to determine tax liability, with a retention period of at least three years after the final payment of the particular tax liability was due.6Indiana General Assembly. Indiana Code 6-8.1-5-4 Records must include source documents such as invoices, receipts, and canceled checks.
Three years is the floor, not what bonus depreciation actually calls for. A single asset’s Indiana adjustment can span six or more tax years, and a sale before the schedule ends forces you to prove cumulative federal and Indiana depreciation from day one. Hold asset records for at least three years after the final depreciation adjustment posts. For seven-year property, that’s roughly a decade of documentation. Information Bulletin 118 emphasizes that taxpayers must report depreciation consistently and maintain sufficient documentation to support each year’s adjustment.2Indiana Department of Revenue. Bonus Depreciation and Section 179 Expensing Treatment for Indiana Income Tax Purposes If you have more than a handful of depreciable assets, a system that tracks federal and Indiana basis separately is close to mandatory.