Multifamily and apartment buildings are among the best candidates for cost segregation multifamily studies — and it's not close. The repetitive nature of apartment units means dozens or hundreds of identical reclassifiable components: appliances, cabinets, flooring, fixtures, and finish work multiplied across every unit. For a $2M 20-unit apartment building, a cost segregation study typically reclassifies $400K–$800K into accelerated depreciation categories.
If you own multifamily property and haven't had a cost segregation study performed, you're almost certainly leaving six-figure deductions unclaimed.
Why Multifamily Properties Are Ideal Candidates
Not all property types yield the same results from cost segregation. Multifamily buildings consistently rank among the highest reclassification rates for one simple reason: repetitive personal property across units.
A single-family rental might have one stove, one refrigerator, one set of cabinets. A 20-unit apartment building has 20 of each — and every one qualifies for 5-year or 7-year depreciation instead of the standard 27.5-year residential schedule. This multiplier effect makes cost segregation disproportionately valuable for multifamily.
Additionally, apartment complexes typically have significant site improvements — parking areas, sidewalks, landscaping, retaining walls, exterior lighting, and signage — that qualify for 15-year depreciation. These land improvements are often 5-10% of total property value on their own.
Components That Qualify for Reclassification
A cost segregation study performed by a qualified engineering firm will walk the property and identify every component that qualifies for shorter-life treatment. For multifamily, the list is extensive:
5-Year Property (Personal Property)
- Appliances: Refrigerators, stoves/ovens, dishwashers, microwaves, garbage disposals, washers/dryers (per unit and common area)
- Flooring: Carpet, vinyl plank, tile (non-structural finish flooring)
- Cabinetry and countertops: Kitchen and bathroom cabinets, vanities, counters
- Window treatments: Blinds, shades, curtain hardware
- Specialty electrical: Dedicated appliance circuits, low-voltage wiring, security systems, intercom systems
- Common area furnishings: Lobby furniture, fitness equipment, laundry room machines
15-Year Property (Land Improvements)
- Parking areas: Asphalt or concrete lots, striping, curbing
- Landscaping: Trees, shrubs, irrigation systems, decorative rock
- Sidewalks and pathways: Concrete walks, steps, ADA ramps
- Exterior lighting: Parking lot lights, path lighting, decorative fixtures
- Fencing and retaining walls: Property-line fencing, privacy screens, retaining structures
- Signage: Property identification signs, directional signs
- Playground equipment and recreational facilities: Pool, pool fencing, sport courts
Dollar Example: $2M, 20-Unit Apartment Building
Let's walk through a realistic scenario. You acquire a 20-unit apartment building for $2,000,000. After subtracting the land value ($400,000), the depreciable basis is $1,600,000.
| Category | % of Basis | Amount | Recovery Period |
|---|---|---|---|
| 5-Year Personal Property | 22% | $352,000 | 5 years (or Year 1 with bonus) |
| 15-Year Land Improvements | 8% | $128,000 | 15 years (or Year 1 with bonus) |
| Remaining 27.5-Year Property | 70% | $1,120,000 | 27.5 years (standard) |
| Total Reclassified | 30% | $480,000 | — |
Without cost segregation, your annual depreciation deduction on the full building would be approximately $58,182 ($1.6M / 27.5 years). With cost segregation and 100% bonus depreciation, you claim $480,000 in year one — plus the standard depreciation on the remaining $1.12M. That's a year-one deduction more than 8x larger than the standard approach.
At a 37% marginal tax rate, $480,000 in accelerated deductions generates approximately $177,600 in first-year tax savings. The cost segregation study itself typically runs $8,000–$15,000 for a property of this size — making the ROI extraordinary, often exceeding 10:1.
How It Interacts With Bonus Depreciation
Bonus depreciation is the turbocharger that makes cost segregation especially powerful. Under current rules (restored to 100% by the One Big Beautiful Bill), all property with a recovery period of 20 years or less qualifies for full first-year expensing.
That means every dollar reclassified by the cost segregation study — both the 5-year personal property and the 15-year land improvements — can be deducted entirely in the year of acquisition. Without bonus depreciation, you'd still get accelerated depreciation over 5 or 15 years. With it, you get the full amount immediately.
This creates a powerful acquisition strategy: buy a multifamily property, perform a cost segregation study, and claim a massive first-year deduction that can offset income from the property itself, other real estate, or (if you qualify for REPS status) even your active income.
Lookback Studies: You Don't Need a New Purchase
Already own a multifamily property you've been depreciating under the standard 27.5-year method? You can still benefit. A lookback cost segregation study lets you claim all the missed accelerated depreciation from prior years in a single catch-up adjustment — without amending prior returns.
This is done through an IRS-approved change in accounting method (Form 3115). The cumulative missed depreciation is reported as a Section 481(a) adjustment on the current year's return. For properties held for several years, this catch-up can be substantial.
Passive Activity Considerations
There's an important caveat: rental income is passive by default. That means even a $480,000 depreciation deduction can only offset passive income unless you qualify for Real Estate Professional Status or use the short-term rental loophole.
For investors with multiple properties generating passive income, cost segregation is still extremely valuable — the losses offset rental income from this property or others. And any excess losses carry forward indefinitely, available to offset future passive income or to be released upon sale.
Own a multifamily property? We'll estimate your reclassification potential and projected tax savings — free, no obligation.
Get a Free Cost Segregation Estimate →When to Order the Study
The ideal time for a cost segregation study is the year you acquire the property — that's when bonus depreciation delivers the most impact. But lookback studies make it worthwhile at any time. Here's the general timing framework:
- New acquisition: Order the study before year-end to capture deductions on that year's return
- Existing property (held 1-5 years): Lookback study still captures significant catch-up depreciation
- Existing property (held 5+ years): Still beneficial, though the cumulative catch-up is smaller relative to remaining life
- Major renovation: Partial asset disposition and cost segregation on the new improvements can create additional deductions
For multifamily owners with portfolios of any size, cost segregation isn't optional — it's a fundamental part of the tax strategy. The math is simply too compelling to ignore.