Cost Segregation in North Carolina

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 North Carolina comes in.

2. North Carolina and federal bonus depreciation

North Carolina has decoupled from IRC 168(k) (and 168(n)) bonus depreciation continuously since 2002 and that did not change post-OBBBA. SB 595 (signed July 2, 2026) advanced the state's static conformity date to July 5, 2025, which pulls in OBBBA's permanent 100% bonus as the federal starting point, but G.S. 105-153.6(a) still requires an addback of 85% of any 168(k) deduction on both individual (AGI) and corporate (G.S. 105-130.5B) returns. The addback is recovered in equal 20% slices over the following 5 years, so a NC taxpayer effectively deducts 15% of the bonus amount in year 1 and 17% in each of years 2-6. There is no state/federal basis difference, and on disposition any unrecovered 20% deductions continue (with a transferee basis add rule for certain transfers under subsection (e)).

Add back 85% of the federal 168(k)/168(n) deduction in the year claimed; deduct 20% of that addback in each of the first 5 taxable years following the addback year (G.S. 105-153.6(a)-(b) individuals; G.S. 105-130.5B corporations). Full deduction recovered over 6 years total; no basis difference; remaining installments survive asset disposition.

3. Section 179 in North Carolina

North Carolina Section 179 cap: $25,000 dollar limitation / $200,000 investment (phase-out) limitation, in place for tax years 2013 forward (confirmed current for TY2024 by NCDOR).

NC does not follow federal Section 179 limits (including OBBBA's $2.5M/$4M). Under G.S. 105-153.6(c), a taxpayer must add back 85% of the amount by which the federal 179 deduction exceeds what would be deductible using NC's $25,000/$200,000 limits, then deduct 20% of the addback in each of the following 5 years. So large 179 elections are deferred, not lost, at the state level. For 2010-2012 the NC limits were $250,000/$800,000.

4. Does it still help in North Carolina?

Yes. North Carolina only decouples from 168(k) bonus and the federal 179 limits; it fully follows federal MACRS classification, recovery periods (5/7/15/27.5/39-year), and methods. Reclassifying components into 5-, 7-, and 15-year property via a cost segregation study accelerates NC depreciation on its own, and even the disallowed bonus portion comes back on the NC return over the following 5 years rather than over 27.5/39 years.

• •NC has decoupled from bonus depreciation since 2002; the 85% addback / 20%-over-5-years mechanism applies identically to individuals (G.S. 105-153.6) and corporations (G.S. 105-130.5B)
• •Because the addback is 85% (not 100%), NC still allows 15% of the federal bonus deduction in year 1; total deduction equalizes over 6 years
• •Section 179 is effectively frozen at $25,000/$200,000 for tax years 2013 forward even after the 2026 conformity update; excess is deferred via the same 85% addback, not permanently lost
• •SB 595 (signed July 2, 2026) moved the static conformity date from Jan 1, 2023 to July 5, 2025, picking up OBBBA, but simultaneously decoupled from the new IRC 174A R&E expensing (80% addback, recovered 25%/yr over 4 years)
• •No state/federal basis difference is created; on sale of the property, unused 20% recovery installments continue, and a special bonus-asset-basis rule lets certain transferees add remaining deductions to basis (G.S. 105-153.6(e))
• •NC individual income tax is a flat 4.25% for 2025, scheduled to drop to 3.99% in 2026, so the state cost of the bonus deferral is small relative to federal savings
• •NC corporate income tax (2.25% in 2025) is phasing to 0% by 2030, shrinking the corporate-level impact of the addback every year
• •Before SB 595, NCDOR's TY2025 guidance (under the old Jan 1, 2023 conformity date) required pre-OBBBA treatment entirely; the July 2026 update is what brought OBBBA provisions into the NC starting point

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.