Commercial Real Estate Tax Strategies for Investors

Commercial real estate tax strategies for investors in 2026 fall into a handful of levers: accelerating depreciation through cost segregation and restored 100 percent bonus depreciation, expensing qualifying improvements under Section 179, deferring gains through 1031 exchanges or opportunity funds, unlocking passive losses by qualifying as a real estate professional, claiming the 20 percent pass-through deduction, managing interest deductions under Section 163(j), and capturing energy-efficiency deductions under Section 179D. Each tool has its own rules, and every depreciation dollar you take now comes back as recapture when you sell.

Cost Segregation With 100 Percent Bonus Depreciation

A commercial building depreciates over 39 years by default under the modified accelerated cost recovery system.¹ A cost segregation study accelerates that timeline. An engineering team inspects the property and reclassifies components that qualify as tangible personal property — specialized lighting, cabinetry, decorative finishes, parking lots, landscaping — onto five, seven, or fifteen-year schedules.

The One, Big, Beautiful Bill Act, signed into law in 2025, restored 100 percent bonus depreciation for qualified property, reversing a phase-down that had dropped the rate to 60 percent in 2024 and 40 percent in 2025. You can now deduct the full cost of eligible short-life components in the year the property is placed in service. On a $5 million acquisition where a study reallocates $1.2 million to personal property, you write off that $1.2 million immediately instead of spreading it across 39 years.

The IRS publishes a Cost Segregation Audit Techniques Guide that examiners use when reviewing these studies.² A credible study should be prepared or supervised by a qualified engineer, tie each reclassified component to a specific recovery period, and document why each item qualifies as personal property rather than a structural component.

Section 179 Expensing for Interior Improvements

Renovations to the inside of a nonresidential building already in service often qualify as “qualified improvement property.” The category covers interior upgrades but excludes building enlargements, elevators, escalators, and structural framework changes.³ Qualifying items include HVAC systems, roofing on nonresidential buildings, fire protection and alarm systems, and security systems.

Under Section 179, you can elect to expense up to $2,560,000 of qualifying property placed in service in 2026. The deduction phases out dollar for dollar once total qualifying purchases exceed $4,090,000 and disappears at $6,650,000. The cap applies across all your Section 179 property for the year, not per building. Unlike bonus depreciation, Section 179 lets you choose how much to expense, which gives you more control over how much taxable income you shelter in a given year.

Like-Kind Exchanges Under Section 1031

Selling a commercial property triggers capital gains tax on appreciation and depreciation recapture. A like-kind exchange under Section 1031 defers that entire bill by reinvesting the proceeds into another qualifying property.⁴

Two deadlines govern the transaction, both starting the day you close on the sale. You have 45 days to identify potential replacement properties in writing. The identification follows either the three-property rule, which lets you name up to three properties regardless of value, or the 200-percent rule, which allows any number of properties as long as their combined fair market value doesn’t exceed twice the value of what you sold. The entire exchange must close within 180 days of the sale or by your tax return due date for that year, whichever comes first.⁴

You cannot touch the sale proceeds. A qualified intermediary holds the funds and releases them only to purchase the replacement property. If you receive even a dollar directly, that amount becomes taxable “boot” — cash or debt relief taxed at capital gains rates, which run up to 20 percent for long-term gains plus the 3.8 percent net investment income tax for higher earners.⁵ To avoid boot entirely, the replacement property’s value and debt must equal or exceed the relinquished property’s.

Reverse Exchanges

Sometimes the replacement property surfaces before the old one sells. A reverse exchange handles this by having an exchange accommodation titleholder take title to the new property (typically through a single-member LLC) while you work on selling the relinquished property. Under the safe harbor in Revenue Procedure 2000-37, the 45-day and 180-day deadlines apply, but the clock starts when the accommodation titleholder acquires the parked property. You still can’t own both properties simultaneously in your own name, which is why the parking arrangement exists. Reverse exchanges cost more to execute because of legal and holding costs, but they prevent you from losing a replacement while waiting for a buyer.

Opportunity Zone Investments and the 2026 Recognition Date

Opportunity zones defer capital gains by reinvesting them into designated low-income communities through a qualified opportunity fund, which must hold at least 90 percent of its assets in qualified zone property.⁶ You have 180 days from the sale that produced the gain to invest in a qualifying fund.⁷ If the fund acquires existing property rather than building new, it must substantially improve the property by spending more on improvements than the building’s adjusted basis (excluding land) within 30 months of acquisition.

Every deferred gain parked in an opportunity fund comes due no later than December 31, 2026. On that date, you recognize the lesser of your original deferred gain or the current fair market value of your fund interest.⁶ If the investment has declined, you owe tax only on the lower amount. Payment is due with your 2026 return, typically by April 15, 2027. For projects still in early development, obtaining a formal valuation before year-end 2026 may reduce the recognized gain if current value sits below the original deferred amount.

Basis step-ups remain available only for earlier investors. If you invested by December 31, 2021 and held for at least five years, you receive a 10 percent exclusion of the deferred gain. If you invested by December 31, 2019 and held for seven years, the exclusion rises to 15 percent.⁷ Anyone who invested after those dates cannot meet the required holding periods before the 2026 deadline.

The larger long-term benefit is intact. Hold your fund interest for at least 10 years and make an election at sale, and your basis steps up to fair market value. Appreciation that occurred inside the fund becomes permanently tax-free.⁶ You still owe tax on the original deferred gain in 2026, but the growth from that point forward can be sheltered entirely.

Passive Loss Rules and Real Estate Professional Status

Rental real estate is passive under federal tax law, so losses generally cannot offset wages, business income, or other active earnings.⁸ Unused losses carry forward, but they can sit on the shelf for years while depreciation keeps producing paper losses. Two exceptions break the wall.

If you actively participate in managing your rentals — deciding on tenants, lease terms, and repairs rather than handing everything to a management company — you can deduct up to $25,000 in rental losses against non-passive income. The allowance phases out by 50 cents per dollar of adjusted gross income above $100,000 and disappears at $150,000. For higher-income investors, the second exception matters more.

Qualifying as a real estate professional removes the passive label from your rental activity entirely. You must meet two annual tests: more than half of the personal services you perform during the year must be in real property trades or businesses, and you must log more than 750 hours in those activities. On a joint return, only one spouse needs to qualify independently, and employee hours count only if that spouse owns at least 5 percent of the employer.

Even after qualifying, you still need to materially participate in each rental where you want to use losses against non-passive income. The most common test is spending more than 500 hours per year on that activity.⁹ Alternatively, you can elect to group all your rentals as a single activity and combine hours across the portfolio. Keep a contemporaneous log. The IRS scrutinizes these claims heavily, and reconstructions after the fact rarely hold up.

The 20 Percent Qualified Business Income Deduction

Owners who hold commercial real estate through pass-through entities like LLCs, S corporations, or partnerships may deduct up to 20 percent of their qualified business income from that activity.¹⁰ The Section 199A deduction was originally set to expire after 2025 but has been extended by recent federal legislation. For 2026, the full 20 percent is available without limitation to single filers with taxable income up to $201,750 and joint filers up to $403,500. Above those thresholds, wage and property basis limits phase in, with full restriction at $276,750 single and $553,500 joint.¹¹

Once you’re in the phase-in range, the deduction is limited to the greater of 50 percent of W-2 wages paid by the business, or 25 percent of W-2 wages plus 2.5 percent of the unadjusted basis of qualified property. That second formula favors commercial real estate: a building with a large depreciable basis generates a sizable deduction under the property-basis prong even when the entity pays minimal wages.

The IRS does not automatically treat rental real estate as a qualified trade or business. Revenue Procedure 2019-38 provides a safe harbor: maintain separate books and records for each rental enterprise and perform at least 250 hours of rental services per year.¹² Qualifying services include negotiating leases, supervising maintenance, collecting rent, and managing tenant relations. Document the hours and attach a statement to your return electing the safe harbor.

Interest, Operating Expenses, and the 163(j) Election

Mortgage interest on a commercial property is deductible under Section 163, and for most investors it’s the single largest annual deduction. Property taxes, insurance, management fees, repairs, and utilities are deductible as ordinary and necessary business expenses under Section 162.¹³

Section 163(j) caps deductible business interest at 30 percent of adjusted taxable income plus any business interest income.¹⁴ For tax years beginning in 2026, the adjusted taxable income calculation adds back depreciation and amortization, which gives real estate businesses a larger base and softens the cap.

Real property trades or businesses can elect out of the 163(j) limitation entirely. The trade-off: you must depreciate real property under the alternative depreciation system, which uses a 40-year recovery period for nonresidential real property instead of 39 years. For a highly leveraged property where interest expense exceeds 30 percent of adjusted taxable income, opting out is usually the better result. Components reclassified through cost segregation as personal property remain eligible for bonus depreciation even after the election.

Section 179D Energy-Efficient Building Deduction

Section 179D provides a per-square-foot deduction for commercial buildings or building systems that meet energy efficiency targets through lighting, HVAC, and building envelope improvements that reduce energy consumption by at least 25 percent compared to a reference standard. The base deduction starts at roughly $0.50 per square foot for 25 percent savings and rises with each additional percentage point, up to approximately $1.00 per square foot at 50 percent savings. Projects meeting prevailing wage and apprenticeship requirements receive a significantly larger deduction, reaching up to approximately $5.00 per square foot or more.¹⁵ These figures are indexed annually for inflation, so 2026 amounts may be slightly higher than the most recently published thresholds.

On a 100,000-square-foot office building meeting prevailing wage rules and achieving a 50 percent energy reduction, the deduction can exceed $500,000 in a single year. Unlike depreciation, it’s a standalone deduction that doesn’t require you to capitalize and recover the cost over time.

Depreciation Recapture When You Sell

Every depreciation deduction described above creates a future tax liability. When you sell a commercial building, depreciation claimed on the building itself (the 39-year or 40-year property) is recaptured at a maximum federal rate of 25 percent.⁵ The rate applies to the portion of your gain attributable to accumulated depreciation, not the entire sale price. Any remaining gain above your original purchase price is taxed at the long-term capital gains rate of up to 20 percent, plus the 3.8 percent net investment income tax for higher earners.

Components reclassified as personal property through a cost segregation study face steeper recapture. Depreciation on those items is recaptured at ordinary income rates, which can reach 37 percent. The accelerated deductions on lighting, flooring, and site improvements therefore produce a larger tax hit per dollar of recapture than the building itself would. Front-loading depreciation still favors most owners because of the time value of money, but the spread between ordinary rates and capital gains rates narrows the benefit more than some investors expect.

A 1031 exchange defers both types of recapture along with the capital gain, which is why experienced investors rarely sell outright when they can exchange into another property. When the final property in the chain is eventually sold or passes through an estate, the picture changes significantly, particularly if heirs receive a stepped-up basis.

1
Office of the Law Revision Counsel. 26 U.S. Code 168 – Accelerated Cost Recovery System
2
Internal Revenue Service. Audit Techniques Guides (ATGs)
3
Internal Revenue Service. Publication 946 – How To Depreciate Property
4
Internal Revenue Service. Like-Kind Exchanges Under IRC Section 1031
5
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
6
Office of the Law Revision Counsel. 26 USC 1400Z-2 – Special Rules for Capital Gains Invested in Opportunity Zones
7
Internal Revenue Service. Opportunity Zones Frequently Asked Questions
8
Office of the Law Revision Counsel. 26 U.S. Code 469 – Passive Activity Losses and Credits Limited
9
Internal Revenue Service. Publication 925
10
Office of the Law Revision Counsel. 26 U.S. Code 199A – Qualified Business Income
11
Internal Revenue Service. Qualified Business Income Deduction
12
Internal Revenue Service. Rev. Proc. 2019-38
13
Office of the Law Revision Counsel. 26 U.S. Code 162 – Trade or Business Expenses
14
Internal Revenue Service. Questions and Answers About the Limitation on the Deduction for Business Interest Expense
15
Internal Revenue Service. Energy Efficient Commercial Buildings Deduction