Rental Property Depreciation: 27.5 vs. 39-Year Schedules, Recapture, and When Cost Segregation Pays

Your rental property is probably handing you a five-figure tax deduction every year, and you never have to spend a dollar to claim it. Depreciation lets you write off the building you already bought, year after year, while the rent checks keep coming in. But the deduction only works if you put the building on the right schedule: depreciate a commercial building over 27.5 years, or depreciate the land under any building at all, and you have overstated deductions the IRS can unwind with interest and penalties.

This guide walks through how rental property depreciation actually works: the 27.5-year residential and 39-year commercial schedules, how to split land from building, the mid-month convention that decides your first-year deduction, what happens when you sell, and when a cost segregation study is worth paying for.

Depreciation Basics: What You Can and Cannot Write Off​

Depreciation is the tax system's way of recognizing that buildings wear out. The IRS lets the owner of rental property deduct a slice of the building's cost each year, even though no cash leaves your pocket. Three things determine your annual deduction: your depreciable basis, the recovery period, and the depreciation method.

For rental real estate, the method is already decided for you. Under the Modified Accelerated Cost Recovery System (MACRS), residential and commercial buildings both use straight-line depreciation: the same deduction every full year. There is no accelerated option for the building itself, which also means the building's depreciation never triggers an alternative minimum tax adjustment.

Two limits matter before anything else:

• Only the owner depreciates. If you lease property, you cannot depreciate it, though you can depreciate permanent improvements you make to leased space.
• Land is never depreciable. Your purchase price buys both dirt and structure, and only the structure goes on a depreciation schedule. Splitting the two is the first calculation every landlord must get right.

Step 1: Split Land From Building​

When you buy a rental for one lump price, the IRS expects a reasonable allocation between non-depreciable land and depreciable building. There is no single mandated formula, but three methods are widely accepted:

1. Property tax assessment ratio. If the county assessor values the land at 20 percent of the total assessed value, allocate 20 percent of your purchase price to land. This is the most common approach for small landlords because the numbers are public and defensible.
2. Appraisal. A qualified appraisal done at or near purchase that separates land and improvement values.
3. Insurance replacement cost. Your insurer's estimate of what it would cost to rebuild the structure, used as evidence of the building's share.

Say you buy a rental house for $340,000 and the assessment ratio puts land at 25 percent. Your land value is $85,000 and your depreciable building basis is $255,000. Every depreciation calculation that follows starts from that $255,000, plus certain settlement costs that are added to basis, such as title insurance and recording fees. Points and prepaid interest, by contrast, are generally current deductions or amortized separately, not added to the building's basis.

Getting this split wrong is the most expensive beginner mistake in rental depreciation. Depreciating the full purchase price including land overstates your deduction every single year, and the error compounds because it also corrupts your adjusted basis when you sell.

Step 2: Pick the Right Schedule — 27.5 vs. 39 Years​

The recovery period depends on what kind of building you own:

• 27.5 years for residential rental property: a building where 80 percent or more of the gross rental income comes from dwelling units. Single-family rentals, duplexes, and apartment buildings all land here.
• 39 years for nonresidential (commercial) real property: offices, retail, warehouses, and hotels or motels rented on a transient basis.

The classification follows the building's use, not its zoning label. A mixed-use building whose rental income falls below the 80 percent dwelling-unit threshold is nonresidential property on the 39-year schedule. Transient lodging such as a hotel is commercial even though guests sleep there.

The annual math is simple division. A $275,000 residential building yields a $10,000 annual deduction ($275,000 divided by 27.5). A $390,000 commercial building yields the same $10,000 a year ($390,000 divided by 39). The longer commercial schedule means each dollar of building buys less annual deduction, which is one reason commercial investors lean harder on cost segregation, covered below.

The Alternative Depreciation System​

You may elect the Alternative Depreciation System (ADS) instead, which stretches residential property to 30 years. The election is made building by building in the first year the property is placed in service, and it is irrevocable, so do not elect it casually. It mainly appeals to electing real property trades or businesses that need ADS to escape the business interest limitation, and to owners who prefer smaller deductions now in exchange for less recapture later.

Step 3: Start the Clock With the Placed-in-Service Date and the Mid-Month Convention​

You begin depreciating when the property is ready and available for rent, not when the first tenant signs. A house listed and habitable in November starts depreciating in November even if it sits vacant through December. Conversely, a property still under renovation is not in service yet. Document the date with the listing, photos, or the certificate of occupancy, because it anchors your entire schedule.

Real property uses the mid-month convention: whatever month you place the building in service or take it out of service, you treat it as happening at the midpoint of that month. Buy that $275,000 residential rental and place it in service in June, and your first-year deduction is 6.5 months' worth: $10,000 times 6.5 divided by 12, or about $5,417. Sell it in a later March, and you claim 2.5 months for the final year.

Appliances, carpeting, and furniture follow different conventions (half-year or mid-quarter), which is why keeping the building and its contents on separate schedules matters from day one.

The Supporting Cast: 5, 7, and 15-Year Property​

Not everything in a rental depreciates over decades. The IRS assigns much shorter lives to the parts that wear out faster:

These shorter schedules are where the real tax planning lives. Property with a recovery period of 20 years or less qualifies for bonus depreciation, which means the 5, 7, and 15-year components can potentially be written off far faster than the building. The 27.5 and 39-year structure itself never qualifies. Improvements you add later, such as a new roof, are treated as separate items on the same schedule as the building.

Section 179 expensing, with a 2025 limit of $2.5 million phasing out above $4 million of property placed in service, can also cover qualifying personal property in a rental, but it never applies to the building structure itself.

Recording Depreciation in Your Books​

Your tax return needs the schedule, but your books need the monthly entries. Booking depreciation monthly keeps your profit-and-loss honest: without it, a rental looks more profitable than it is for eleven months and then takes a surprise hit at tax time.

In plain-text accounting, one recurring transaction does the job. For the $275,000 building depreciating at $10,000 a year, the monthly entry is $833.33:

2026-01-31 * "Monthly depreciation - 123 Main St rental"
  Expenses:Rental:Depreciation                          833.33 USD
  Assets:Rental:123-Main:Accumulated-Depreciation      -833.33 USD

The accumulated-depreciation account grows more negative each month, so your balance sheet always shows both the building's original cost and its net book value at a glance. When you sell, that running total is exactly the number the recapture calculation asks for, which brings us to the part landlords most often overlook.

What Happens When You Sell: Recapture​

Depreciation is a timing benefit, not a permanent exemption. When you sell, the IRS claws back part of the benefit through recapture, and the rate depends on what kind of property you depreciated:

• The building (straight-line real property). Because real property placed in service after 1986 uses only straight-line depreciation, there is no ordinary-income recapture. Instead, the accumulated depreciation comes back as unrecaptured Section 1250 gain, taxed at your capital-gain rate up to a maximum of 25 percent. Gain above that is regular long-term capital gain, currently taxed at top rates up to 20 percent.
• Appliances, furniture, and other personal property. These face Section 1245 recapture at ordinary income rates, up to 37 percent. This is the hidden cost of aggressive front-loaded deductions on short-lived property.

And here is the trap: the IRS applies the allowed or allowable rule. Your basis is reduced by depreciation you were entitled to claim whether or not you actually claimed it. Skip depreciation for five years and you owe recapture tax on deductions you never took. There is no scenario where failing to depreciate saves you money; it only forfeits deductions while keeping the tax bill.

A sale therefore produces up to three tax buckets from one transaction: ordinary-rate recapture on personal property, 25-percent unrecaptured gain on the building, and capital-gain rates on true appreciation. Knowing which dollars land in which bucket is exactly what your accumulated-depreciation records are for.

When Cost Segregation Pays​

A cost segregation study is an engineering analysis that picks apart your building and reclassifies components into 5, 7, and 15-year property: decorative lighting, specialty flooring, landscaping, parking lots, and dozens of smaller items. Each reclassified dollar moves from the 27.5 or 39-year schedule onto a short schedule eligible for bonus depreciation, pulling years of deductions into year one.

Studies typically cost a few thousand dollars and up, so the question is always whether the accelerated benefit clears the fee. Cost segregation tends to pay when:

• The depreciable basis is large enough. Rules of thumb cluster around buildings worth several hundred thousand dollars and up; on a small property with high land value, there is simply not enough reclassifiable basis to justify the fee.
• You can use the loss now. Rental real estate is generally a passive activity, so accelerated depreciation that creates a passive loss only offsets passive income unless you qualify for an exception such as real estate professional status or the short-term-rental material-participation rules. A giant suspended loss earning no current benefit still cost you the study fee.
• You will hold long enough. Selling soon after a study means the front-loaded deductions bounce back as recapture, possibly at higher ordinary rates on the reclassified personal property. Short holds destroy the economics.
• Bonus depreciation is available. The value of reclassification rises and falls with the bonus percentage in effect for the year the property was placed in service.

It tends not to pay for small single-family rentals with modest improvement value, for owners with no passive income to absorb the loss, or for flippers who will sell within a couple of years. Never let projected tax savings talk you into a property deal that does not work on its rental economics alone.

Common Mistakes That Cost Landlords Real Money​

1. Depreciating the land. The classic error. Every dollar of land on your schedule is an overstated deduction plus a corrupted basis at sale.
2. Using the wrong recovery period. A commercial condo on the 27.5-year schedule, or a residential fourplex on the 39-year schedule, misstates every year's deduction.
3. Ignoring the mid-month convention. Claiming a full month for the placed-in-service month, or a full final month after disposition, overstates both endpoints.
4. Skipping depreciation to "save" deductions. The allowed-or-allowable rule means unclaimed depreciation still reduces your basis. You lose the deduction and keep the recapture.
5. Lumping improvements into the building. A new roof, HVAC system, or addition is a separate depreciable item with its own placed-in-service date. Folding it into the original schedule misstates both.
6. Losing the paper trail. Without a running accumulated-depreciation record per property, the sale-year recapture calculation becomes an expensive reconstruction project for your CPA.

Keep Your Depreciation Schedules Organized From Day One​

Rental depreciation rewards the organized and punishes the forgetful: the landlord with a clean per-property schedule claims every dollar on time and sails through the sale-year recapture math, while the landlord with a shoebox of closing statements pays a CPA to rebuild years of history. Beancount.io provides plain-text accounting that gives you complete transparency and control over your financial data — no black boxes, no vendor lock-in. Get started for free and see why developers and finance professionals are switching to plain-text accounting.