The tax benefits of commercial real estate come from a handful of Internal Revenue Code provisions that work together: annual depreciation deductions on the building, immediate write-offs for operating and financing costs, a 20 percent deduction on pass-through rental income, deferral of gains at sale, and a basis reset at death that can erase accumulated gains entirely. Each provision has its own rules and trade-offs, and the investors who benefit most are the ones who plan across all of them rather than chasing one deduction in isolation.
Depreciation on the Building
Depreciation is the foundation. Even when a building is appreciating in the market, the tax code lets you deduct part of its cost each year as though it were wearing out. Nonresidential commercial property has a 39-year recovery period under the Modified Accelerated Cost Recovery System, and you claim the deduction on a straight-line basis.1Internal Revenue Service. Publication 946 – How To Depreciate Property A building with $3.9 million in depreciable cost generates a $100,000 annual deduction that offsets rental income without any cash outlay.
Only the building qualifies. You have to separate its value from the land underneath, because land never depreciates.1Internal Revenue Service. Publication 946 – How To Depreciate Property The property must be held for use in a trade or business or for the production of income. When you eventually sell for more than your adjusted basis, the depreciation you claimed is taxed at a maximum rate of 25 percent, known as unrecaptured Section 1250 gain.2Internal Revenue Service. Topic No. 409, Capital Gains and Losses That recapture rate is lower than top ordinary rates, but plan for it.
Accelerating Deductions With Cost Segregation and Bonus Depreciation
Waiting 39 years is the default. Two tools front-load the deductions dramatically.
A cost segregation study is an engineering-based analysis that reclassifies components of a building into shorter depreciation categories. Specialized lighting, decorative finishes, and non-structural flooring often qualify as five- or seven-year personal property. Parking lots, fencing, and permanent landscaping fall into a 15-year land improvement category.1Internal Revenue Service. Publication 946 – How To Depreciate Property For a $5 million commercial property, it is not unusual for 20 to 40 percent of the building’s cost to shift into shorter-lived categories.
Bonus depreciation is what supercharges those reclassified assets. Under the One Big Beautiful Bill Act, 100 percent bonus depreciation is back for qualifying business property placed in service after January 19, 2025.3Internal Revenue Service. One, Big, Beautiful Bill Provisions You can deduct the full cost of eligible shorter-lived property in the year you place it in service instead of spreading it out. Bonus depreciation does not apply to the 39-year building structure itself, so pairing it with cost segregation is what produces the six-figure first-year deductions that make commercial real estate so tax-efficient.
One caution on documentation: keep the cost segregation report. It is your evidence if the IRS questions the reclassifications.
Operating Expenses and Mortgage Interest
Ordinary costs of running a commercial property reduce taxable income dollar for dollar. Property management fees, insurance premiums, routine maintenance and repairs, and property taxes assessed by local jurisdictions are all deductible in the year paid.
Interest on loans used to buy or improve commercial property is generally deductible as well, but Section 163(j) caps larger businesses’ business interest deduction at the sum of business interest income plus 30 percent of adjusted taxable income, with any excess carrying forward. Real estate businesses have a special option. You can elect to be treated as an excepted trade or business, which removes the 163(j) cap entirely.4Internal Revenue Service. Questions and Answers About the Limitation on the Deduction for Business Interest Expense The trade-off is that the election requires you to depreciate real property under the alternative depreciation system, which uses longer recovery periods and disqualifies affected property from bonus depreciation.5eCFR. 26 CFR 1.163(j)-9 – Elections for Excepted Trades or Businesses
For heavily leveraged properties with big interest bills, electing out usually makes sense. For lower-debt properties with substantial short-lived assets, keeping the 163(j) cap and claiming bonus depreciation may produce more savings. The election is irrevocable, so run the numbers both ways first.
Using Rental Losses Against Other Income
Depreciation and cost segregation often generate paper losses. Whether you can use those losses to offset wages, business profits, or investment income depends on the passive activity rules. Rental real estate is treated as a passive activity by default, and passive losses only offset passive income. Unused losses carry forward until you have passive income or sell the property.6Office of the Law Revision Counsel. 26 U.S. Code 469 – Passive Activity Losses and Credits Limited
The $25,000 Active Participation Allowance
If you actively participate in managing your rental (a lower bar than material participation, satisfied by making management decisions, approving tenants, and setting lease terms), you can deduct up to $25,000 in rental losses against non-passive income. The allowance phases out at $1 for every $2 of adjusted gross income above $100,000 and disappears entirely at $150,000.6Office of the Law Revision Counsel. 26 U.S. Code 469 – Passive Activity Losses and Credits Limited For high earners, this allowance is often unavailable.
Real Estate Professional Status
Qualifying as a real estate professional removes the passive label entirely and lets you deduct unlimited rental losses against any income, including W-2 wages. Two tests must both be met in the same tax year: more than 750 hours in real property businesses in which you materially participate, and more than half of all personal services you perform across every trade or business are in those real property activities.6Office of the Law Revision Counsel. 26 U.S. Code 469 – Passive Activity Losses and Credits Limited For a married couple filing jointly, one spouse must independently satisfy both requirements. You must also materially participate in each rental activity, though you can elect to treat all your rentals as a single activity to simplify the test.
The status carries a second benefit. Your net rental income is no longer subject to the 3.8 percent Net Investment Income Tax that otherwise applies to passive rental income for taxpayers above certain thresholds.7Internal Revenue Service. Questions and Answers on the Net Investment Income Tax The IRS scrutinizes these claims aggressively, so keep detailed contemporaneous time logs.
The 20 Percent Qualified Business Income Deduction
If you own commercial real estate through a pass-through entity (partnership, S corporation, or sole proprietorship), you may qualify for a 20 percent deduction on your net rental income under Section 199A.8Internal Revenue Service. Qualified Business Income Deduction The One Big Beautiful Bill Act made this deduction permanent by removing its original 2025 sunset. On $200,000 of qualified rental income, that is $40,000 off taxable income before any other benefit is calculated.
The rental has to qualify as a trade or business. Revenue Procedure 2019-38 offers a safe harbor: at least 250 hours of rental services per year with contemporaneous records will get you there. For rental enterprises that have existed at least four years, the 250-hour test must be met in any three of the previous five years. Qualifying services include negotiating leases, coordinating repairs, reviewing tenant applications, and managing the property.9Internal Revenue Service. Revenue Procedure 2019-38
Income Limits and the Property-Basis Alternative
High-income taxpayers face limitations. For 2026, the deduction begins phasing down once taxable income exceeds roughly $201,750 for single filers or $403,500 for joint filers. Above those thresholds, the deduction for each qualified business is capped at 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 the business’s depreciable property.10Office of the Law Revision Counsel. 26 U.S. Code 199A – Qualified Business Income Commercial owners tend to fare well under the second calculation, because buildings carry large depreciable bases even when payroll is modest.
Deferring Gains With a 1031 Exchange
When you sell a commercial property at a profit, you normally owe capital gains tax plus 25 percent recapture on prior depreciation. A like-kind exchange under Section 1031 lets you defer both by rolling the proceeds into a replacement property of equal or greater value.11Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Property Held for Productive Use or Investment You cannot touch the sale proceeds. A Qualified Intermediary holds the funds in a restricted account throughout the exchange; taking constructive receipt disqualifies the deferral.12eCFR. 26 CFR 1.1031(k)-1 – Treatment of Deferred Exchanges
The deadlines are strict, and the IRS does not grant extensions. Within 45 days of the sale, you must identify potential replacement properties in writing to your Qualified Intermediary. You must then close on the replacement by the earlier of 180 days after the sale or the due date of your tax return (including extensions) for the year of sale.11Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Property Held for Productive Use or Investment That second qualifier catches sellers off guard: a fall sale can compress the 180 days into a shorter window if you do not extend your return.
The replacement property must have equal or greater value and debt compared to what you gave up for the deferral to be complete. Any cash or debt reduction you take out (called “boot”) is taxable in the year of the exchange.
Qualified Opportunity Zones
Opportunity Zones offer a different route. When you realize a capital gain from any source, you can reinvest that gain into a Qualified Opportunity Fund that invests in designated low-income areas. The original gain is deferred until the earlier of the date you sell your fund investment or December 31, 2026.13Internal Revenue Service. Opportunity Zones Frequently Asked Questions Eligible gains include capital gains and Section 1231 gains recognized before January 1, 2027.
The bigger benefit is for long-term holders. If you hold the Opportunity Fund investment for at least ten years, you can elect to increase your basis to fair market value at the time of sale, permanently excluding all appreciation in the fund from taxation.14Internal Revenue Service. Invest in a Qualified Opportunity Fund A commercial property in a qualifying zone that doubles over a decade produces zero tax on that appreciation.
Stepped-Up Basis at Death
The exit that erases deferred gains is inheritance. Under federal law, when property passes to an heir at the owner’s death, the heir’s tax basis resets to the property’s fair market value on the date of death.15Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent Accumulated depreciation, deferred gains from prior 1031 exchanges, and years of appreciation all fall out of the tax ledger.
Take a property bought for $2 million, depreciated to a $500,000 adjusted basis, and now worth $4 million. Sold during the owner’s lifetime, that produces $3.5 million in taxable gains, including depreciation recapture at 25 percent. If the owner instead dies and the heir inherits, the heir’s basis becomes $4 million. A sale the next day at $4 million produces zero capital gains tax. This is why many experienced investors 1031-exchange through their careers and hold the final property until death. Estate taxes may apply to very large estates, but the income tax on decades of gain disappears.
How the Benefits Stack
The real power is in the combination. In a typical year, depreciation and cost segregation shelter rental income. Operating expenses and mortgage interest reduce what remains. The QBI deduction takes 20 percent off what is left. When you sell, a 1031 exchange defers the tax; hold the final property until death, and a stepped-up basis can erase it.
Each benefit has its own conditions. Electing out of the 163(j) interest cap unlocks unlimited interest deductions but costs you bonus depreciation. Real estate professional status frees passive losses but demands documented time. Cost segregation accelerates deductions today but increases recapture if you sell soon. Planning across these provisions together is what turns commercial real estate into the tax-advantaged investment it is designed to be.