Cost Segregation
Reclassifying building components into shorter recovery periods — engineering-based studies, bonus depreciation interactions, partial dispositions, recapture, and when a study does or does not make sense.
Start here
5 piecesNo background assumed — the pieces that build the foundation.
Guide · Intro · 13 min
The cost segregation study, start to finish
A cost segregation study runs from a quick feasibility screen through provider selection, engineering fieldwork, the written report, filing (current-year or Form 3115 look-back), and years of downstream use. Here is the complete owner's walkthrough, carried through a worked $3.2 million building.
Brief · Intro · 3 min
Cost segregation for mobile home parks
A mobile home park is almost all land improvements: pads, utility distribution, roads, and amenities routinely put 50–80% of depreciable basis in the 15-year class. Why the percentages are the highest in real estate — and why the land split matters most.
Brief · Intro · 3 min
Cost segregation for self-storage facilities
Self-storage buildings are cheap; the site around them is not. Studies commonly move 20–30% of basis to short-life classes, driven by paving, fencing, gates, and security — plus a long-running debate over whether unit partitions are structural.
Brief · Intro · 3 min
Land improvements: the 15-year class that isn't land
Parking lots, landscaping, and site utilities are 15-year depreciable land improvements — distinct from the land itself, which is never depreciable. The line between them, and the land-value allocation trap that inflates studies.
Brief · Intro · 3 min
5-, 7-, and 15-year property: concrete examples by class
What actually lands in each MACRS short-life class after a cost segregation study — carpet and appliances at 5 years, office furniture at 7, parking lots and landscaping at 15 — in one reference table.
The working layer
30 piecesThe practitioner's day-to-day rules, mechanics, and traps.
Guide · Working · 7 min
Cost segregation for hotels and resorts
Hospitality properties reclassify among the highest of any asset class — often 25–40% of depreciable basis into 5-, 7-, and 15-year property. FF&E, food service, amenities, and site work drive the result; brand-standard renovation cycles keep it paying.
Guide · Working · 6 min
Cost segregation results by property type: what different buildings actually yield
Typical short-life reclassification runs from roughly 15 percent of basis for a bare warehouse to 40 percent or more for a restaurant or manufacturing plant. What drives the spread — finishes, dedicated equipment, and site work — with component examples for office, multifamily, retail, restaurant, hotel, warehouse, and medical buildings.
Guide · Working · 8 min
Cost segregation study quality: engineered, residual, and DIY approaches compared
The IRS Cost Segregation Audit Techniques Guide recognizes a hierarchy of study methodologies. Detailed engineering approaches are the most defensible; residual and rule-of-thumb methods trade accuracy for cost; software-driven studies sit uneasily in between. What each delivers, what each costs, and the red flags in a cheap report.
Guide · Working · 7 min
Reading a cost segregation study the way an IRS examiner would
The IRS Cost Segregation Audit Techniques Guide tells examiners how to grade study quality, which methodologies to trust, and which component classifications to challenge. It is also the best checklist a CPA has for vetting a study before signing the return.
Guide · Working · 7 min
When cost segregation doesn't make sense
Cost segregation is deferral, not free money — and for short holding periods, passive-loss-limited owners, low-bracket years, planned 1031 exchanges, and small buildings, the study can be worth little or less than its fee. The honest checklist.
Guide · Working · 7 min
Cost segregation and bonus depreciation: why the combination does the work
Bonus depreciation under Section 168(k) applies to property with recovery periods of 20 years or less — exactly what a cost segregation study creates. With 100% bonus restored for property acquired after January 19, 2025, the year-one arithmetic changes dramatically.
Guide · Working · 8 min
What a cost segregation study is, and why the recovery period is the whole game
A cost segregation study reclassifies parts of a building from 39- or 27.5-year real property into 5-, 7-, and 15-year classes, accelerating depreciation. Here is the legal foundation, the engineering process, and the honest arithmetic of the benefit.
Brief · Working · 4 min
Step-up in basis and cost segregation: depreciating inherited real estate
Section 1014 resets inherited property's basis to date-of-death value and erases the decedent's depreciation recapture. The heir depreciates the stepped-up basis as newly placed in service — which makes inherited buildings strong cost segregation candidates, though bonus depreciation is barred on decedent-basis property. Partnership real estate needs a Section 754 election to get the same result.
Brief · Working · 3 min
When to commission a cost segregation study
The best time is the placed-in-service year, but look-back studies via Form 3115 catch up missed depreciation in one year without amending. Renovations reset the question; an imminent sale usually ends it. A decision table.
Brief · Working · 3 min
Cost segregation for manufacturing facilities
Manufacturing plants reclassify 30–60% of basis because so much of the 'building' exists to serve the process: heavy power distribution, process piping, reinforced foundations, cranes. The primary-use analysis from Scott Paper does the heavy lifting.
Brief · Working · 3 min
Cost segregation for auto dealerships
Dealerships typically reclassify 25–35% of basis: service equipment, showroom finishes, and acres of paved inventory lot. Manufacturer image-program renovations add a second round of QIP and partial-disposition opportunities — with a floor-plan interest wrinkle.
Brief · Working · 3 min
Cost segregation for gas stations and convenience stores
A qualifying retail motor fuels outlet depreciates its entire building over 15 years under Section 168(e)(3)(E)(iii) — no other building class gets that. Add canopies, tanks, and dispensers, and gas stations reclassify more than almost any retail asset.
Brief · Working · 4 min
Section 179 vs. bonus depreciation for building-adjacent property
Both expensing regimes reach the short-life property a cost segregation study identifies, but they differ on eligibility — 179 uniquely covers roofs and HVAC on nonresidential buildings, while bonus has no dollar cap and no income limit. The differences, and the ordering rule.
Brief · Working · 4 min
Partial disposition elections: writing off the roof you just threw away
When a building component is replaced, Reg. §1.168(i)-8 lets the owner elect to recognize loss on the old component's remaining basis — but only on a timely return for the year of disposition. Cost segregation detail makes the computation easy; missing the deadline makes it gone.
Brief · Working · 3 min
Cost segregation for agricultural buildings and wineries
Farm property carries statutory shortcuts other real estate lacks: single-purpose agricultural structures at 10 years, general farm buildings at 20, grain bins at 7. Wineries split between short-life processing space and 39-year hospitality space.
Brief · Working · 4 min
Tenant improvements: who depreciates what, and over how long
Ownership, not occupancy, decides who deducts a build-out. Landlord-owned improvements are the landlord's asset; tenant-owned improvements depreciate over MACRS lives regardless of lease term; Section 110 construction allowances shift ownership by contract. QIP status and the Section 168(i)(8) lease-termination write-off complete the map.
Brief · Working · 3 min
Passive loss limits: why cost segregation deductions often sit unusable
Section 469 treats rental losses as passive by default, deductible only against passive income. A cost segregation study that manufactures a large year-one loss may just build a suspended-loss carryforward — unless the owner qualifies as a real estate professional or fits the short-term rental exception.
Brief · Working · 3 min
Cost segregation for car washes
Express tunnel car washes reclassify 60–80% of depreciable basis — tunnel equipment, water reclaim, and site work dwarf the building. Why the numbers are real, why promoters still oversell them, and how Section 179 fits alongside bonus.
Brief · Working · 4 min
Qualified improvement property: the 15-year life for interior build-outs
QIP — most interior improvements to nonresidential buildings placed in service after the building — is 15-year, bonus-eligible property after the CARES Act fixed the TCJA's drafting error. Definition, exclusions, and how it fits alongside a cost segregation study.
Brief · Working · 4 min
One building, several incentives: coordinating cost segregation with 179D and energy credits
Cost segregation, the Section 179D deduction, and the Section 48E investment credit can all attach to a single building — but 179D reduces the basis the study depreciates, credit-eligible energy property should be carved out of the study entirely, and each dollar of cost can support only one incentive. Ordering rules and a coordination checklist.
Brief · Working · 3 min
Cost segregation for grocery stores and retail
Grocery anchors reclassify 25–35% of basis on the strength of refrigeration alone; general retail runs lower. Refrigeration systems, checkout, decor, and signage drive the split — and tenant-versus-landlord ownership of improvements decides who benefits.
Brief · Working · 4 min
The repair regulations meet cost segregation: expensing what you'd otherwise capitalize
The tangible property regulations decide repair versus capitalization through the BAR tests applied to the unit of property and its building systems. A cost segregation study's component detail is exactly the evidence that lets later repairs be expensed and torn-out parts be written off.
Brief · Working · 3 min
Cost segregation for restaurants
Restaurants routinely reclassify 25–35% of depreciable basis: kitchen equipment, exhaust systems, decor, and dedicated utilities move to 5-year, and interior build-outs often qualify as 15-year QIP. What moves, and the trap in leasehold ownership.
Brief · Working · 3 min
Cost segregation for senior living facilities
Assisted living can be 27.5-year residential property; skilled nursing is 39-year commercial. That classification question comes before any study — then resident-care equipment, commercial kitchens, and site work drive 20–30% reclassification.
Brief · Working · 4 min
The short-term rental 'loophole' and cost segregation, without the sales pitch
Average stays of seven days or less take a property out of Section 469's rental definition, so material participation — not real estate professional status — determines whether cost segregation losses offset W-2 income. What the rule actually requires, and what promoters overstate.
Brief · Working · 3 min
Cost segregation for multifamily properties
Apartment buildings depreciate over 27.5 years, but a cost segregation study typically moves 20–30% of basis into 5- and 15-year classes — unit appliances and finishes, site amenities, parking. What reclassifies, and when the economics work.
Brief · Working · 4 min
Casualty events and depreciation: storms, fires, and the value of component detail
After a storm or fire, the tax work splits four ways: a casualty loss or gain on the damaged property, a partial disposition of destroyed components, Section 1033 deferral of insurance-funded gain, and capitalization of the restoration under the repair regulations. Owners with component-level records from a cost segregation study compute all four better.
Brief · Working · 4 min
Depreciation recapture after cost segregation: the bill that comes due at sale
Sections 1245 and 1250 tax prior depreciation when a building sells — at up to 37 percent ordinary rates for reclassified personal property and a 25 percent cap for the building itself. How cost segregation changes the character of gain, with the rate arithmetic.
Brief · Working · 4 min
Look-back cost segregation: catching up years of depreciation on Form 3115
A cost segregation study on a building placed in service years ago doesn't require amended returns. Form 3115, filed as an automatic accounting method change, delivers the entire missed depreciation as a one-year Section 481(a) deduction.
Brief · Working · 3 min
MACRS asset classes and recovery periods: a cost segregation reference
What belongs in 5-, 7-, 15-, 27.5-, and 39-year property, with a reference table of the components a cost segregation study typically assigns to each class.
Pro details
10 piecesSpecialist nuance: edge cases, interactions, and planning.
Guide · Pro · 8 min
The Section 163(j) real property election: trading bonus depreciation for interest deductions
An electing real property trade or business escapes the Section 163(j) business interest limitation, but must depreciate its buildings and QIP under ADS — 40-year nonresidential, 30-year residential, 20-year QIP — and loses bonus depreciation on that ADS property. Personal property from a cost segregation study keeps bonus. How to model the trade, and why the election is irrevocable.
Guide · Pro · 6 min
Cost segregation and 1031 exchanges: depreciating the replacement property
After a like-kind exchange, replacement property splits into carryover basis (depreciated on the old schedule) and excess basis (depreciated as new property under Reg. §1.168(i)-6). Cost segregation works on both — but a study done just before an exchange can strand Section 1245 recapture. Ordering strategies and a worked example.
Brief · Pro · 3 min
Recapture planning before the sale
Cost segregation's exit bill: Section 1245 ordinary-income recapture on personal property, unrecaptured Section 1250 gain at 25% on the building, and how price allocation, installment notes, 1031 exchanges, and the basis step-up at death change the answer — including when simply holding wins.
Brief · Pro · 3 min
Cost segregation for office-to-residential conversions
Converting an office to apartments moves the building from 39-year to 27.5-year property — and off the QIP map entirely. How the recovery period changes, what §280B does to demolition costs, and why the study should be staged before the wreckers arrive.
Brief · Pro · 3 min
Cost segregation for golf courses
The golf course fight is not 5-year versus 39-year — it is depreciable versus not depreciable at all. Land shaping is nondepreciable; modern greens, drainage, irrigation, and cart paths are 15-year land improvements. Where the IRS drew the lines.
Brief · Pro · 4 min
Buying real estate from a related party: the depreciation rules that switch off
Related-party acquisitions forfeit Section 179 expensing, fail the bonus depreciation used-property acquisition requirements of Section 168(k)(2)(E)(ii), and can import carryover basis and disallowed-loss taint. A cost segregation study still works on such property — but the acceleration tools it usually feeds do not.
Brief · Pro · 3 min
Real estate professional status and the aggregation election
Section 469(c)(7) lets qualifying real estate professionals treat rental losses as non-passive — but only if they clear the 750-hour and more-than-half tests and, usually, make the aggregation election. Where taxpayers actually lose: hours logs, spouse attribution, and material participation per property.
Brief · Pro · 3 min
Cost segregation for data centers
A data center is mostly electrical and mechanical plant with a roof: UPS, generators, PDUs, CRAC units, and raised floors can push reclassification past 40% of basis. The hard question is where equipment-serving systems end and building systems begin.
Brief · Pro · 4 min
Cost segregation for mixed-use buildings and condos: the 80 percent test
A building is residential rental property (27.5-year) only if 80 percent or more of its gross rental income comes from dwelling units — otherwise the whole building is 39-year nonresidential. How the Section 168(e)(2) test works for mixed-use projects, what it means for QIP, and how condo owners and associations allocate common elements.
Brief · Pro · 4 min
Purchase price allocations versus cost segregation: when the contract binds
In a Section 1060 asset acquisition, an allocation schedule the parties agree to in writing binds them under the Danielson rule — Peco Foods lost a cost segregation study because the contract said 'building.' How to negotiate allocation language that leaves room for a later study.