Why It Matters
When you buy a residential rental property, the IRS lets you deduct a portion of the building's cost every year as depreciation. The formula is straightforward:
(Purchase Price - Land Value) / 27.5 = Annual Depreciation Deduction
On a $300,000 property with $60,000 allocated to land, that's $240,000 / 27.5 = $8,727 per year in depreciation. That $8,727 reduces your taxable rental income — and potentially your W-2 income too, through the $25,000 rental loss allowance — without requiring you to write a check, replace a roof, or fix anything. It's a paper loss that creates real tax savings.
This is the single most important tax benefit in residential real estate investing. Every rental property owner should understand it, claim it, and plan around it. Land is never depreciable — only the building and its components. And when you sell, the IRS will recapture depreciation at a 25% tax rate, whether you claimed it or not.
At a Glance
- Recovery period: 27.5 years for residential rental property (houses, duplexes, apartments)
- Method: Straight-line — equal annual deductions over the recovery period
- Formula: (Purchase Price - Land Value) / 27.5 = Annual Depreciation
- Example: $300K property, $60K land = $8,727/year in deductions
- When it starts: The date the property is "placed in service" (available for rent), not the closing date
- Recapture at sale: 25% federal tax rate on all depreciation claimed (or that should have been claimed)
Annual Depreciation = (Purchase Price - Land Value) / 27.5
How It Works
The depreciable basis. You can't depreciate the full purchase price — land never wears out. Separate the building from the land using your county tax assessment ratio, a professional appraisal, or comparable vacant land sales. Land typically runs 15-25% of purchase price.
The straight-line calculation. Depreciable basis (purchase price minus land) divided by 27.5 = your annual deduction. A $200,000 basis gives you $7,273/year. A $400,000 basis gives you $14,545. Same amount every year for 27.5 years.
The mid-month convention. One wrinkle in year one: the IRS treats you as placing the property in service at the midpoint of that month. Place in service in March = 9.5 months of depreciation. November = only 1.5 months. The MACRS tables in IRS Publication 946 have exact percentages.
What's depreciable beyond the building. Walls, roof, foundation, HVAC, plumbing, electrical, built-in appliances, flooring — all 27.5 years. Improvements after purchase (new roof, HVAC replacement, kitchen renovation) get added as new assets with their own 27.5-year schedule. These rehab costs don't extend the original clock; they start their own.
The phantom loss effect. Depreciation creates a tax deduction without a cash outflow. Your property might generate $12,000 in cash flow after expenses, but after subtracting $8,727 in depreciation, taxable income is only $3,273. You keep $12,000 in the bank but pay taxes on $3,273. With the passive activity loss rules and the $25,000 allowance, depreciation can create a paper loss large enough to offset income from other sources.
Real-World Example
Daniela buys a $350,000 single-family rental. Her appraiser allocates $70,000 to land (20%) and $280,000 to the building. She places it in service on July 15th.
Annual depreciation: $280,000 / 27.5 = $10,182/year
Year-one depreciation (mid-month convention): She placed it in service mid-July, so she gets 5.5 months of depreciation: $10,182 x (5.5/12) = $4,667 in year one.
Year two onward: Full $10,182 per year.
Daniela's rental generates $21,600 in annual rent and has $14,400 in cash expenses (property taxes, insurance, maintenance, management). Her NOI is $7,200. But on her tax return:
- Rental income: $21,600
- Cash expenses: $14,400
- Depreciation: $10,182
- Taxable rental income: -$2,982 (a loss)
Daniela pocketed $7,200 in actual cash flow, but her tax return shows a $2,982 loss. At 22%, that loss saves her $656 in taxes on top of paying zero tax on the $7,200 cash flow. Total depreciation tax benefit: she sheltered $10,182 that would have cost $2,240 in taxes.
Two years later, she replaces the roof for $12,000. That starts its own 27.5-year schedule: $12,000 / 27.5 = $436/year in additional depreciation — stacking on top of her original deduction.
Pros & Cons
- Tax deduction without spending cash — Reduces your taxable income every year without any out-of-pocket expense
- Can shelter all rental income — On many properties, depreciation alone pushes taxable rental income to zero or negative
- Offsets W-2 income via the $25K allowance — Rental losses exceeding income can offset up to $25,000 of your paycheck (MAGI under $150K)
- Applies to every residential rental — From a $150K single-family to a $2M apartment building, every residential rental qualifies
- Improvements stack — Every capital improvement starts its own 27.5-year clock, continuously adding to your annual deduction
- Can be accelerated — A cost segregation study and bonus depreciation front-load deductions far beyond the standard schedule
- Depreciation recapture at sale — The IRS taxes all claimed depreciation at 25% when you sell (Section 1250 recapture), so you're deferring taxes, not eliminating them
- "Allowed or allowable" trap — Even if you forget to claim depreciation, the IRS reduces your cost basis as if you did — meaning you'll owe recapture tax on deductions you never actually took
- Land allocation disputes — If the IRS disagrees with your land/building split, they can reduce your depreciable basis and claw back deductions
- Passive loss limitations — Depreciation losses are passive, so without the $25K allowance or RE professional status, they only offset other passive income
- 27.5 years is slow — Compared to other asset classes (vehicles: 5 years, equipment: 7 years), residential property depreciates at a glacial pace without cost segregation
Watch Out
Always claim your depreciation. Under the "allowed or allowable" rule, the IRS reduces your cost basis by the depreciation you were entitled to claim — whether you actually claimed it or not. Skip it for five years and sell? You'll owe recapture tax on deductions you never took. If you missed prior years, file Form 3115 (Change in Accounting Method) to claim the catch-up deduction in the current year.
Get your land allocation right from the start. The IRS challenges aggressive land/building splits, especially where land values are high. Allocating 10% to land in a coastal city where lots sell for $300K invites scrutiny. Use your county tax assessment, appraisal, or comparable vacant land sales. Document your method.
Don't forget the mid-month convention. New investors often claim a full year of depreciation in the purchase year, but you only get credit from the mid-month placed in service. A January closing gives you 11.5 months; December gives you 0.5 months. Timing matters.
Ask an Investor
The Takeaway
27.5-year depreciation is the foundation of real estate tax strategy. Every dollar of your building's cost becomes a tax deduction over time — $8,727 per year on a $240K building, reducing your taxable income year after year without costing you a penny in cash. It turns taxable rental income into tax-sheltered cash flow and, combined with the $25,000 rental loss allowance, can even offset your W-2 income. The formula is simple: subtract land, divide by 27.5, claim the deduction. Just remember two things: always claim it (the IRS penalizes you if you don't), and plan for the 25% recapture tax when you sell. This is the single deduction that makes rental property the most tax-advantaged investment class available to everyday investors.