Depreciation is the single biggest tax benefit of owning rental property — and the single most misunderstood. Most landlords know there's a depreciation deduction, but very few actually understand how it works, what they're leaving on the table, or how to accelerate it.
This guide walks through rental property depreciation from the ground up: what it is, how the IRS calculates it by default, what bonus depreciation does, and where cost segregation fits in.
What depreciation actually is
Depreciation is the IRS's way of letting you deduct the "wearing out" of a long-lived business asset over time. It's not a cash expense. You don't pay for it. But because the IRS treats it as a deduction against your taxable income, it lowers your tax bill every year you own the property.
For rental real estate, depreciation is usually the largest deduction on your Schedule E. It's why so many rental properties show a paper loss on paper while generating positive cash flow in reality.
The default rules: straight-line, 27.5 years
Under standard rules, residential rental property is depreciated on a straight-line basis over 27.5 years. Commercial property gets 39 years. You don't depreciate the land — only the building and improvements.
Here's the arithmetic on a typical residential rental:
- Purchase price: $400,000
- Land value (not depreciable): $80,000
- Building basis (depreciable): $320,000
- Annual depreciation: $320,000 ÷ 27.5 = ~$11,636 per year
That $11,636 is a straight deduction against your rental income every year for 27.5 years. At a 32% marginal rate, it's worth roughly $3,723 per year in actual tax savings.
This is the minimum. It's what every rental owner gets just by following the default rules and filing a basic Schedule E.
Where the land value comes from
One of the most common mistakes landlords make is assuming the land value is whatever their property tax assessor says it is. County assessors often inflate land values for their own reasons, and blindly copying their allocation can cost you thousands in depreciation.
There are several reasonable methods for allocating land vs. building:
- Tax assessor allocation: Use the ratio on your property tax bill. Simple but often understates the building.
- Appraisal allocation: Pull the allocation from a recent appraisal. Usually more accurate.
- Comparable land sales: Look at recent vacant land sales in the area for a more defensible land value.
The allocation matters because every extra dollar assigned to land is a dollar you can't depreciate — ever.
What makes depreciation actually interesting: shorter recovery periods
Here's the part most landlords never learn. The tax code doesn't require you to treat the entire building as one 27.5-year asset. In reality, a rental property is made up of many different components with legally distinct recovery periods:
- 5-year property: Personal property and assets with a short useful life — appliances, carpet, removable cabinetry, decorative finishes, certain millwork.
- 7-year property: Specialized items such as certain office equipment and select furnishings.
- 15-year property: Land improvements — driveways, walkways, fencing, landscaping, site lighting, retaining walls, outdoor amenities.
- 27.5-year property: The building structure itself — framing, roof, exterior walls, permanent plumbing and electrical systems, HVAC.
If you just depreciate the whole building as 27.5-year property, you're legally overpaying tax. The law allows you to break the basis into these categories — it just requires an engineering-based analysis to do it properly. That analysis is called a cost segregation study.
Bonus depreciation: the accelerator pedal
Bonus depreciation is a separate tax provision that lets you deduct a percentage of qualifying short-life assets in the first year instead of over their normal recovery period. When bonus is 100%, you get the entire deduction in Year 1. When it's 60%, 40%, or 20%, you get that portion in Year 1 and the rest over the normal schedule.
Bonus depreciation applies to property with a recovery period of 20 years or less — which is exactly the 5-, 7-, and 15-year buckets that a cost segregation study creates. The two strategies work together as a one-two punch.
Under the One Big Beautiful Bill Act (OBBBA), 100% bonus depreciation is back for qualifying property acquired after January 19, 2025. Before that cutoff, bonus had been phasing down. If your property was acquired in the right window, the first-year impact is dramatically larger.
For more, see 100% Bonus Depreciation Is Back for 2026.
Depreciation recapture (the fine print)
There's a catch: when you sell the property, the IRS "recaptures" the depreciation you took. On residential rental buildings, recapture applies at up to 25% on the straight-line depreciation and at your ordinary income rate on any gain attributable to accelerated portions.
This scares some owners into not taking depreciation at all. That's a mistake. The IRS calculates your recapture as if you took the depreciation, whether you actually did or not. Not claiming it is just giving up free money.
Also: recapture at sale doesn't erase the time value of money. A dollar saved today is worth more than a dollar paid back in 10 years. And if you use a 1031 exchange to roll into a replacement property, recapture can be deferred indefinitely.
The planning checkpoints every landlord should hit
- At purchase: Get your land vs. building allocation right. This number follows you for the life of the property.
- In the first year: Decide whether to do a cost segregation study. If the property is significant, the math usually wins, and the first year is when bonus depreciation is most useful.
- During renovations: Track the cost of improvements separately. Different components have different recovery periods. Keep invoices. Photograph everything.
- On sale or 1031: Talk to your CPA about recapture. If you're rolling proceeds into another property, a 1031 exchange can defer both capital gains and recapture.
- On prior-year properties: If you've owned a rental for years and never did a cost segregation study, a look-back study provides everything your CPA needs to file IRS Form 3115 and catch up on missed depreciation.
Bottom line
Depreciation is not a small line item. On a well-positioned rental with a cost segregation study and bonus depreciation stacked, first-year depreciation can easily be 5–10x what a straight-line filer gets. At typical marginal tax rates, that's tens of thousands of dollars in year one alone.
If you want to see what's possible on your specific property, use our free cost segregation calculator — it takes under a minute and gives you a real first-year estimate.