1. What a cost segregation study does
A building normally depreciates over 27.5 years (residential) or 39 years (commercial). A cost segregation study breaks the purchase price apart and reclassifies components like flooring, cabinetry, dedicated electrical, and land improvements into 5, 7, and 15-year property, so a large slice of the basis depreciates on much shorter schedules.
On the federal return, that reclassified property also qualifies for bonus depreciation, which restores a 100% first-year write-off for qualifying property acquired and placed in service after January 19, 2025. States set their own rules, which is where Kansas comes in.
2. Kansas and federal bonus depreciation
Kansas has rolling IRC conformity: K.S.A. 79-32,109 defines the 'federal internal revenue code' as the code as it exists and is effective for the taxable year, so OBBBA's permanent 100% bonus depreciation for property acquired after January 19, 2025 flows into Kansas automatically. The individual return (K-40) starts from federal adjusted gross income, and the K.S.A. 79-32,117 modification list contains no bonus depreciation addback, so whatever 168(k) deduction appears on the federal return is fully allowed for Kansas. The same is true on the corporate side (K-120 starts from federal taxable income with no 168(k) addback). No 2025 or 2026 Kansas legislation decoupled from the OBBBA expensing provisions; Tax Foundation's post-OBBBA analysis lists Kansas as fully conforming to 168(k), 168(n), 174, and 179.
Worked example
A $1,000,000 building, with and without a study
Illustrative only. A residential rental purchased for $1,000,000 of building basis (land excluded), acquired and placed in service after January 19, 2025.
Building basis
$1,000,000
Reclassified to 5, 7, and 15-year property (25%)
$250,000
Federal first-year deduction at 100% bonus
$250,000
Year 1 on that $250,000 without a study (27.5-year straight line)
about $9,100
Kansas conforms to federal bonus depreciation, so the state return mirrors the $250,000 first-year deduction.
Model your own numbers with the tax strategy projector.
3. Section 179 in Kansas
Kansas conforms to Section 179 on a rolling basis with no state-specific cap, so the OBBBA-expanded limits ($2.5M deduction / $4M phaseout for property placed in service after Dec 31, 2024, indexed) apply in full on the Kansas return. Separately, Kansas offers its own elective state expensing deduction under K.S.A. 79-32,143a (Schedule K-120EX), available to all income-tax filers for tax years beginning after Dec 31, 2020; it applies only to the cost NOT already recovered through federal 168(k)/179, excludes residential rental and nonresidential real property and any property with a recovery period over 25 years, and carries recapture if the property is sold or moved out of state during its recovery period.
4. Does it still help in Kansas?
Yes, completely: because Kansas takes federal AGI/taxable income as its starting point with no depreciation modification, a cost segregation study delivers the identical benefit on the Kansas return as on the federal return, including 100% bonus on the reclassified 5-, 7-, and 15-year property.
- •Kansas is one of the easiest states in the country for cost segregation: rolling conformity plus no bonus or 179 addback means federal and Kansas depreciation deductions are identical, with zero extra state schedules to track.
- •Kansas has its own bonus-like elective expensing deduction (K.S.A. 79-32,143a, filed on Schedule K-120EX) that lets taxpayers immediately expense the portion of an asset's cost NOT already deducted via federal 168(k)/179; with 100% federal bonus restored, there is usually little or no remaining basis for this election, so it matters mainly for assets that are ineligible for or elect out of federal bonus.
- •The Kansas expensing election explicitly excludes residential rental property, nonresidential real property, and any property with a MACRS recovery period over 25 years, so the building shell itself never qualifies for it; only the federal bonus pathway (via cost-seg reclassified short-life property) accelerates real-estate deductions in Kansas.
- •The Kansas expensing deduction was corporate-only from 2013-2020 (2013 SB 196) and was re-opened to all income taxpayers, including individuals and pass-through owners, for tax years beginning after December 31, 2020 (2021 SB 50).
- •Claiming the Kansas expensing deduction forfeits other Kansas tax credits and accelerated depreciation for the same investment, and the deduction is recaptured pro rata if the property is sold or relocated out of Kansas during its recovery period.
- •Excess Kansas expensing deduction over Kansas-apportioned income is treated as a Kansas net operating loss rather than lost.
- •Kansas never decoupled from TCJA-era or OBBBA bonus depreciation, unlike roughly 20 other states that require addbacks; it also imposes no state-specific Section 179 cap.
5. The exit: recapture and timing
The accelerated deductions come back into view when you sell. Gain attributable to the 5, 7, and 15-year property is Section 1245 recapture, taxed at ordinary rates, and the straight-line depreciation on the building itself is unrecaptured Section 1250 gain, taxed at up to 25%. A study does not create that bill, it moves deductions forward, but the timing of the sale decides how much of the benefit you keep.
Two levers manage the exit. A 1031 exchange defers both flavors of recapture along with the rest of the gain, and simply holding the property lets the time value of the early deductions do its work; most owners want a 3 to 5 year horizon before a taxable sale for the math to stay comfortably positive. Model the exit before you commission the study, not after.