Cost Segregation for Multifamily Properties

What Cost Segregation Means for Multifamily and Apartment Investors

Multifamily real estate, including duplexes, triplexes, apartment complexes, and large portfolio properties, represents one of the most tax-advantaged asset classes available to investors. Under IRC Section 168(e)(2)(A), residential rental property is assigned a 27.5-year recovery period for depreciation purposes. While that straight-line schedule generates meaningful annual deductions, it leaves a substantial amount of front-loaded tax savings on the table.

A cost segregation study is an engineering-based analysis that identifies individual building components eligible for reclassification into shorter Modified Accelerated Cost Recovery System (MACRS) asset classes. Instead of depreciating the entire property over 27.5 years, a cost segregation study separates qualifying components into 5-year, 7-year, and 15-year recovery categories under IRC Sections 1245 and 1250. The result is dramatically accelerated depreciation, which reduces taxable income in the early years of ownership and improves cash flow.

How Component Reclassification Works

Every multifamily property contains hundreds of individual components that serve different functions. The IRS allows certain components to be depreciated over shorter periods based on their classification as personal property (5-year and 7-year assets) or land improvements (15-year assets), rather than as structural components of the building itself.

For a typical multifamily apartment building, 20% to 40% of the total depreciable cost basis can be reclassified into these shorter-lived asset categories. The exact percentage depends on the property's construction type, age, unit count, and the scope of common area improvements.

Common Reclassifiable Components in Apartment Buildings

The following components are frequently identified during a multifamily cost segregation study:

• 5-Year Property (IRC Section 1245): Appliances (refrigerators, dishwashers, ranges, microwaves, washers, dryers), carpeting, vinyl flooring, window treatments, cabinetry, countertops, certain decorative lighting fixtures, and specialized plumbing and electrical connections serving removable equipment.
• 7-Year Property (IRC Section 1245): Fitness center equipment, office furniture, security systems, common area furnishings, and movable partitions.
• 15-Year Property (IRC Section 1250): Parking lots, sidewalks, curbing, exterior lighting, landscaping, irrigation systems, fencing, retaining walls, site drainage, storm sewers, and site utilities (gas, electric, water, and sewer lines up to the building connection point).

A Real Dollar Example: $2 Million Apartment Building

Consider a 12-unit apartment building purchased for $2,000,000. After subtracting the land value of $300,000, the depreciable basis is $1,700,000.

Without a cost segregation study, the entire $1,700,000 is depreciated straight-line over 27.5 years, producing approximately $61,818 in annual depreciation.

With a cost segregation study, assume 30% of the depreciable basis ($510,000) is reclassified into shorter-lived asset classes. Under the One Big Beautiful Bill Act (OBBBA), which made 100% bonus depreciation permanent for qualifying assets, that entire $510,000 can be deducted in Year 1. The remaining $1,190,000 continues to depreciate over 27.5 years at approximately $43,272 per year.

The first-year depreciation jumps from $61,818 to $553,272 (the $510,000 bonus depreciation plus the $43,272 standard depreciation on the remaining basis). At a combined federal and state tax rate of 37%, that translates to approximately $188,700 in first-year tax savings compared to roughly $22,873 under the standard depreciation method. The incremental tax benefit in Year 1 alone is approximately $165,827.

OBBBA and Permanent 100% Bonus Depreciation

Prior to the OBBBA, bonus depreciation had been scheduled to phase down from 100% to 80%, 60%, 40%, and eventually 0% under the original Tax Cuts and Jobs Act timeline. The OBBBA eliminated that phasedown entirely, making 100% bonus depreciation permanent for all qualifying property with a recovery period of 20 years or less.

For multifamily investors, this is transformative. Every dollar reclassified through a cost segregation study into the 5-year, 7-year, or 15-year class can be fully deducted in the year the property is placed in service. There is no longer any urgency to "beat a deadline" on bonus depreciation, but there is every reason to act now, because every year without a study in place is a year of tax savings left unclaimed.

Form 3115: Claiming Missed Depreciation on Existing Properties

One of the most valuable aspects of cost segregation is that it can be applied retroactively. If you purchased a multifamily property years ago and have been depreciating it on the standard 27.5-year schedule, you are not required to amend prior tax returns. Instead, you can file IRS Form 3115 (Application for Change in Accounting Method) to adopt the accelerated depreciation method prospectively.

Under IRC Section 481(a), the cumulative difference between what you actually claimed and what you could have claimed is calculated as a single "catch-up" adjustment. This adjustment, known as the Section 481(a) adjustment, is taken entirely in the year of the accounting method change. For a property held for several years, this catch-up deduction can be substantial, often exceeding the benefit of a study performed in the year of acquisition.

Passive Activity Rules and Multifamily Investments

Understanding how passive activity limitations interact with cost segregation is essential for maximizing the benefit. Under IRC Section 469, rental real estate activities are generally treated as passive, regardless of the taxpayer's level of participation. This means that accelerated depreciation deductions from a cost segregation study create passive losses, which can only offset passive income (such as rental income from other properties, K-1 distributions from passive partnerships, or other passive investments).

However, there are important exceptions. Taxpayers who qualify as real estate professionals under IRC Section 469(c)(7) can treat their rental activities as nonpassive, allowing accelerated depreciation losses to offset W-2 wages, business income, and other active income. To qualify, a taxpayer must spend more than 750 hours per year in real property trades or businesses, and more than half of their total working hours must be in those activities.

For multifamily investors who do not qualify as real estate professionals, the accelerated depreciation still provides value by offsetting rental income and other passive income. Additionally, suspended passive losses carry forward and are fully deductible upon the sale or disposition of the property under IRC Section 469(g).

Why Multifamily Properties Are Ideal Candidates for Cost Segregation

Apartment buildings and multifamily complexes tend to yield above-average reclassification percentages compared to single-family rentals. The repetition of components across multiple units (appliances, flooring, cabinetry, and fixtures in every kitchen and bathroom) compounds the benefit. Common areas, parking structures, pools, fitness centers, laundry facilities, and extensive site improvements all contribute additional reclassifiable value. Properties with recent renovations or capital improvements often see reclassification percentages at the higher end of the 20% to 40% range.

Whether you own a 4-unit building or a 200-unit apartment complex, the principles are the same. The study pays for itself many times over through accelerated tax deductions, and with permanent 100% bonus depreciation under OBBBA, the financial impact is immediate.