Cost Segregation in Minnesota

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 Minnesota comes in.

2. Minnesota and federal bonus depreciation

Minnesota's 2026 tax bill (signed May 2026) updated the state's IRC conformity date to May 1, 2026, so the state now recognizes the OBBBA's permanent 100% bonus depreciation for property acquired after January 19, 2025 as the federal starting point. However, Minnesota keeps its long-standing decoupling mechanism for both individual and corporate taxpayers: taxpayers must add back 80% of the federal 168(k) bonus deduction on the Minnesota return, then recover it via a 20%-per-year subtraction over the following five years. The addback applies to individuals, C corps, S corps, partnerships, estates and trusts; for pass-throughs, the 80% addback is computed at the partner/shareholder level via Schedules KPI/KS. The one post-OBBBA exception: bonus depreciation on qualified production property under new IRC 168(n) (qualified manufacturing/production real property) requires no Minnesota addback at all.

Add back 80% of the federal bonus depreciation deduction in year 1 (individuals on Schedule M1MB; C corps on Form M4; pass-through owners via Schedules KPI/KS/KF), then subtract 20% of that addback in each of the five following tax years. Net effect: 20% of the bonus deduction is allowed in year 1 and the remaining 80% comes back evenly over years 2 through 6. Qualified production property under IRC 168(n) is exempt from the addback.

3. Section 179 in Minnesota

Full conformity to federal Section 179 limits for tax years 2020 and later with no addback (MN DOR: 'The addition is not required for tax years 2020 and later'). With the conformity date now at May 1, 2026, the OBBBA's increased federal cap ($2.5 million expensing / $4 million phase-out for 2025, indexed) flows through to Minnesota. Pre-2020, Minnesota limited 179 to 2003-era amounts with an 80% addback recovered over 5 years; that regime is gone, and 2018-2019 like-kind-exchange property was fixed retroactively.

4. Does it still help in Minnesota?

Yes. Minnesota starts from federal taxable income and follows federal MACRS recovery periods and methods (5/7/15/27.5/39-year) without modification; only the 168(k) bonus amount is adjusted. So reclassifying components into 5-, 7-, and 15-year property still accelerates Minnesota depreciation on its own, 20% of any bonus claimed is allowed immediately, and the 80% addback is only a 5-year deferral, not a permanent disallowance; fully conformed Section 179 (where usable, e.g. on qualifying non-residential components) avoids the addback entirely.

• •Minnesota adopted OBBBA via its May 2026 tax bill (IRC conformity date moved to May 1, 2026, generally retroactive to match federal effective dates), so 100% bonus for post-1/19/2025 acquisitions is recognized federally-to-state, subject to the 80% addback.
• •The 80% addback / 5-year recovery has survived every conformity update since 2003; recognizing 100% bonus federally only changes the size of the addback, not the mechanism.
• •Qualified production property under IRC 168(n) is exempt from the Minnesota bonus addback -- the only full-conformity carve-out, aimed at manufacturing facilities, not typical rental real estate.
• •Section 179 history: 2006-2019 Minnesota capped 179 at 2003 levels with its own 80% addback; full conformity (no addback, federal limits) began tax year 2020, retroactively fixed for 2018-2019 like-kind-exchange property.
• •For partnerships and S corporations, bonus flows through pre-addback: partners/shareholders compute their own 80% addback from Schedule KPI/KS amounts (individuals report on Schedule M1MB).
• •Minnesota's 2026 bill selectively decoupled elsewhere -- e.g. it decoupled from OBBBA domestic R&E expensing for C corporations while conforming for pass-throughs -- so conformity is provision-by-provision, worth rechecking each session.
• •If an investor sells the property before the 5-year recovery completes, remaining 20% subtractions continue on later Minnesota returns; the addback is never permanently lost.
• •Top individual rate of 9.85% makes the deferral economically meaningful for high-income investors doing large cost seg studies.

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.