When you buy a rental property, the IRS does not allow you to deduct the full purchase price in the year you buy it. Instead, it requires you to spread the deduction over the property's "useful life." For residential real estate, that useful life is 27.5 years. This annual deduction is called depreciation, and it is one of the most powerful tax benefits available to real estate investors.
Depreciation is a non-cash expense. You do not write a check for it. You simply claim it on Schedule E of your tax return and it reduces the amount of rental income that is subject to federal tax. On a $550,000 building, for example, the annual depreciation deduction is roughly $20,000 — every single year, for 27.5 years, regardless of whether the property is rising or falling in market value.
Under the Modified Accelerated Cost Recovery System (MACRS), residential rental property is assigned a 27.5-year recovery period. Commercial property uses a 39-year schedule. This distinction matters enormously for investors because a shorter recovery period means larger annual deductions.
The math is straightforward. Take your depreciable basis — the building value, not the land — and divide it by 27.5. A property with a $412,500 depreciable basis produces a $15,000 annual deduction. Over a 10-year hold, that is $150,000 in cumulative deductions. If you are in the 37% federal bracket, that represents up to $55,500 in avoided federal tax over the decade.
The deduction begins in the month you place the property in service, so there is a partial-year calculation in year one. In year 27.5, you similarly claim a partial-year deduction. From year 2 onward through year 27, the deduction is a flat, predictable number you can budget around.
One critical point that trips up new investors: land is not depreciable. The IRS reasons that land does not wear out. Only the improvements — the structure itself — can be depreciated. This means you need to allocate your total purchase price between land and building before you can calculate your deduction.
Most investors use the ratio from their county property tax assessment as a starting point. If the assessment shows 20% land and 80% improvements, you apply that split to your purchase price. On a $500,000 acquisition, that gives you a $400,000 depreciable basis, yielding about $14,545 per year. A cost segregation study can further increase the depreciable basis allocated to short-life components, accelerating the benefit significantly.
Here is what makes depreciation so valuable: your property is almost certainly not losing real economic value at the rate the IRS assumes. In many markets, real estate appreciates. Yet every year you are claiming a deduction that reduces your taxable rental income — or even turns a profitable property into a tax loss on paper.
Imagine a property that generates $24,000 in annual rent, costs $10,000 in operating expenses, and has a $14,000 depreciation deduction. On paper, you show zero taxable income — even though cash flow is positive. This is the "depreciation shield." It is the reason experienced real estate investors frequently pay little or no federal income tax on their rental income, even when they are building substantial cash-flowing portfolios.
Rental income and expenses are reported on Schedule E of your federal return. Depreciation is listed as a separate line item under expenses, and it flows through to reduce or eliminate the net rental income that appears on your Form 1040. If depreciation pushes you into a rental loss, that loss is generally classified as passive — meaning it can only offset other passive income unless you qualify as a Real Estate Professional or use the short-term rental loophole.
When you eventually sell the property, the IRS "recaptures" the depreciation you claimed at a maximum federal rate of 25%. This is separate from the standard capital gains rate. For example, if you claimed $100,000 in depreciation over a 7-year hold, up to $25,000 in additional federal tax could be owed at sale. The key planning tool to defer this is a 1031 exchange, which lets you roll proceeds into a new property and push the recapture obligation further into the future.
Worked Example
The property appraiser values land at 18% of the total, meaning $111,600 for land and $508,400 for the building. The investor's annual straight-line depreciation is $508,400 ÷ 27.5 = $18,487 per year. The property generates $36,000 in gross rent and has $12,000 in operating costs, producing $24,000 in net income before depreciation. After the $18,487 deduction, taxable rental income drops to just $5,513. At a 35% marginal rate, the investor saves approximately $6,470 in federal taxes compared to a scenario with no depreciation. Compounded over a 10-year hold, that is $64,700 in cumulative tax savings from depreciation alone, not counting any cost segregation acceleration.
Learn how a cost segregation study reclassifies building components into 5-, 7-, and 15-year buckets to dramatically accelerate depreciation in the early years of ownership.
How the One Big Beautiful Bill Act restored 100% bonus depreciation for 2025 and beyond, and what that means for real estate investors doing cost segregation today.
The wall that prevents most rental losses from offsetting W-2 income — and the two main strategies to legally break through it.