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 Utah comes in.
2. Utah and federal bonus depreciation
Utah conforms fully to IRC 168(k) bonus depreciation for both individual and corporate income tax. Utah is a rolling-conformity state: individual tax starts from federal adjusted gross income (Utah Code 59-10-103) and corporate tax from federal taxable income (Utah Code 59-7-101), with the IRC adopted as currently in effect, and the additions/subtractions statutes contain no bonus-depreciation addback. That means OBBBA's permanent 100% bonus for property acquired and placed in service after January 19, 2025 flows through to the Utah return automatically, with no state adjustment. No 2025 or 2026 Utah legislation decoupled from 168(k); the TC-20 corporate instructions state Utah generally follows the IRC for depreciation, amortization and basis.
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
Utah 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 Utah
Utah conforms to federal Section 179 in full via rolling conformity, including the OBBBA-expanded limits ($2.5M deduction cap, $4M phase-out threshold, indexed) effective for tax years beginning after 2024. No Utah addback or separate state computation; the federal 179 deduction carries into Utah taxable income unchanged.
4. Does it still help in Utah?
Yes, and in Utah there is nothing to recover or track separately: because the state conforms to both MACRS recovery periods and 100% bonus, every dollar a cost segregation study reclassifies into 5-, 7-, or 15-year property gets the same immediate 100% write-off on the Utah return as on the federal return, with no depreciation addback schedule to maintain.
- •Utah has never decoupled from bonus depreciation, unlike roughly 20 other states; federal and Utah depreciation schedules are identical, so no separate state depreciation records are needed.
- •Utah is a flat-tax state and keeps cutting the rate: 4.65% (2023), 4.55% (2024), 4.50% for 2025 (HB 106, 2025 session), with reports of a further cut to 4.45% effective 2026 (SB 60), so the state-side value of a deduction is modest (~4.5 cents per dollar) but frictionless.
- •TC-20 corporate instructions explicitly state Utah generally follows the IRC for depreciation, amortization and basis; basis differences arise only in rare legacy situations, not from bonus or 179.
- •Utah's rolling conformity means OBBBA items (100% bonus, expanded 179, new 168(n) qualified production property) applied in Utah the moment they became federal law; no state legislation was needed in the 2025 or 2026 sessions.
- •Nonresident investors owning Utah rental property report the same federally-depreciated rental income on TC-40B/TC-20; there is no Utah-specific depreciation modification for real estate.
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.