Cost Segregation for Multifamily and Apartment Buildings

Multifamily is the property type where cost segregation scales best. The reason is repetition: every unit contains the same set of short-life components, so a 60-unit building carries sixty kitchens, sixty bathrooms, sixty sets of appliances, and sixty flooring packages. That volume drives reclassification percentages that a single-family rental cannot match.

The Baseline

Residential rental property is depreciated over 27.5 years under IRC Sec. 168(c), recovering about 3.64% of basis annually. A property qualifies as residential rental when 80% or more of gross rental income comes from dwelling units.

That 27.5-year life applies to the structure. It does not properly apply to appliances, cabinetry, carpet, window treatments, decorative lighting, or the substantial site improvements that accompany a multifamily property.

What Reclassifies in an Apartment Building

Per-unit 5-year property. Refrigerators, ranges, dishwashers, microwaves, washers and dryers, carpet and vinyl plank flooring, kitchen and bath cabinetry and countertops where not structurally integrated, window blinds, decorative light fixtures, and closet systems. Multiply by unit count and this becomes the largest single category in most studies.

Common area 5-year property. Leasing office furniture and finishes, fitness equipment, clubhouse furnishings, laundry room equipment, mailbox systems, security and access control, and pool equipment.

15-year land improvements. This is where multifamily separates from single-family. Parking lots and carports, site lighting, sidewalks, landscaping and irrigation, perimeter fencing and gates, dog parks, playgrounds, pool decking and surrounds, retaining walls, and storm drainage. On a garden-style property these routinely reach 8% to 15% of total basis on their own.

The result is typically 20% to 35% of depreciable basis reclassified, with newer and more amenity-rich properties at the higher end.

The Numbers on a Real Deal

A 48-unit garden apartment complex purchased for $7,200,000, with $1,100,000 allocated to land, leaves a $6,100,000 depreciable basis.

An engineering study identifies 27% as short-life property: $1,647,000, split across 5-year unit components and 15-year site improvements. With 100% bonus depreciation permanent under the One Big Beautiful Bill Act, that entire amount is deductible in year one.

The remaining $4,453,000 of structure produces about $162,000 of 27.5-year depreciation. Total first-year depreciation is roughly $1,809,000, against approximately $222,000 without a study.

The incremental deduction is $1,587,000. See bonus depreciation under OBBBA and the complete cost segregation guide.

Who Can Actually Use the Loss

A deduction that large runs straight into IRC Sec. 469, and the answer depends on how the property is held.

Individual owner-operators. A long-term multifamily property is a rental activity and therefore passive per se under Sec. 469(c)(2). The loss is suspended unless the owner qualifies as a real estate professional under Sec. 469(c)(7), which requires more than 750 hours in real property trades or businesses and more than half of all personal services performed there, plus material participation in the activity. Full-time operators frequently qualify. Passive investors with day jobs do not.

Syndication limited partners. Limited partners generally cannot establish material participation, so the loss is passive. It offsets other passive income and otherwise carries forward on Form 8582, releasing in full when the interest is disposed of in a fully taxable transaction. See how cost segregation affects your syndication K-1.

Closely held C corporations. Under IRC Sec. 469(e)(2), passive losses may offset net active income. See the closely held C-Corp rule.

Real estate professionals. With a grouping election under Treas. Reg. 1.469-4, a portfolio of properties can be treated as a single activity for material participation purposes, which is often what makes REPS workable across multiple buildings. See grouping elections.

Partnership Allocation Issues

Multifamily is usually held in a partnership or multi-member LLC, which adds a layer.

Depreciation is allocated according to the operating agreement, subject to the substantial economic effect rules of Treas. Reg. 1.704-1(b). Many syndication agreements allocate depreciation disproportionately to limited partners in early years, which is why a K-1 loss can exceed a proportionate share of capital.

Two limits apply at the partner level. Basis under IRC Sec. 704(d) limits deductible loss to the partner's adjusted basis, though partnership debt allocated under Sec. 752 increases basis, and nonrecourse mortgage debt is typically what makes large first-year losses usable. At-risk rules under IRC Sec. 465 apply separately, with qualified nonrecourse financing on real property generally treated as at risk.

Buying Into an Existing Property

Multifamily changes hands frequently, and each purchase resets the analysis. A new buyer takes a new cost basis and can commission a new study regardless of whether the prior owner did one. Depreciation history does not carry over; it stays with the seller and is recaptured on their return.

Renovation spending after acquisition also matters. Value-add operators replacing flooring, appliances, and cabinetry across a property are generating 5-year property continuously, and a study performed after the renovation program captures that. Coordinating the study with the capital improvement schedule is worth more than doing it on day one and never revisiting it.

Partial asset dispositions apply here too: when you replace roofs across a property, an election lets you write off the remaining basis of the roofs removed. See partial asset disposition.

Properties Already Owned

A study on a property placed in service in a prior year does not require amended returns. Form 3115 and a Sec. 481(a) adjustment claim the entire cumulative missed depreciation in the current year, under an automatic change requiring no user fee. The bonus rate applied is the rate in effect in the placed-in-service year. See lookback cost segregation.

Recapture at Exit

Sec. 1245 recapture on personal property is ordinary income to the extent of gain, and structural depreciation is unrecaptured Sec. 1250 gain at 25%. Multifamily is commonly exchanged under IRC Sec. 1031 rather than sold, which defers both. Where a sale is planned, the study still typically wins on time value, but the recapture should be modeled at underwriting rather than discovered at closing.

Getting the Study Right

Insist on a physical inspection with unit-level sampling across floor plans and renovation vintages, since a property with three unit types and two renovation phases has meaningfully different component values. Verify the land allocation against the appraisal. Confirm the report reconciles to total basis and cites classification authority. And require that site improvements be quantified from actual measurements rather than estimated as a percentage.

Frequently Asked Questions

How much of an apartment building can be reclassified?

Typically 20% to 35% of depreciable basis, with newer and more amenity-rich properties at the higher end. The drivers are per-unit components multiplied across the unit count, appliances, cabinetry, flooring, and window treatments, plus site improvements such as parking, lighting, landscaping, and fencing, which alone can reach 8% to 15% of basis on garden-style properties.

Can a passive multifamily investor use the depreciation loss?

Generally not against wages or business income. A long-term rental is passive per se under IRC Sec. 469(c)(2), so the loss is suspended on Form 8582 unless the investor qualifies as a real estate professional or has other passive income. Suspended losses are not lost; they carry forward and release in full when the interest is disposed of in a fully taxable transaction.

How does partnership debt affect my ability to deduct the loss?

Partnership liabilities allocated to a partner under IRC Sec. 752 increase that partner's basis, and basis under Sec. 704(d) limits how much loss can be deducted. Nonrecourse mortgage debt is typically what gives limited partners enough basis to absorb a large first-year depreciation allocation. The at-risk rules of Sec. 465 apply separately, with qualified nonrecourse financing on real property generally treated as at risk.

Should I do the study before or after a value-add renovation?

Often after, or in coordinated phases. Renovation spending on flooring, appliances, and cabinetry creates new 5-year property, and a study timed to capture the completed scope reflects it. Where the acquisition itself carries substantial short-life content, a study in the acquisition year plus a follow-up covering the renovation program captures both.

Can I still do a study on a building I bought several years ago?

Yes. File Form 3115 to change the method of accounting for depreciation and take a Sec. 481(a) adjustment claiming the entire cumulative missed depreciation in the current year. No amended returns are required, the change is automatic, and no user fee applies. The bonus depreciation rate used is the rate in effect for the year the property was placed in service.

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