Rental Property Depreciation Calculator

What depreciation actually is, and why it's a gift from the IRS

Depreciation is an accounting expense that lets you deduct the cost of an investment building from your taxable income, spread out over many years. The catch — and this is the part that confuses people — is that the property isn't actually losing value. In most markets, it's appreciating. But the IRS still lets you treat the building as if it's wearing out. So you collect rent, the property goes up in value, and your tax return shows a paper loss every year. That's why real estate is one of the most tax-advantaged investments available to regular people.

How the timeline works

The IRS picks an arbitrary number of years over which a building "depreciates":

• Residential rental property (1-4 unit residential, plus 5+ unit residential apartment buildings) — 27.5 years
• Commercial real estate (office, retail, industrial) — 39 years

Every year you own the property, you deduct 1/27.5 (or 1/39) of the depreciable basis as an expense on Schedule E. On a $400,000 building basis, that's about $14,500 a year of deduction — for 27.5 years.

Land doesn't depreciate — only the building does

Land doesn't wear out, so the IRS doesn't let you depreciate it. You have to split your purchase price between land value and building value. The cleanest way: use your county assessor's ratio. They list separate assessed values for land and improvements. Take that ratio and apply it to your actual purchase price. So if the assessor says the property is 20% land / 80% building, and you paid $500K, your depreciable basis is $400K (the building) and $100K (land) is sitting in your basis but not depreciating.

The recapture trap when you sell

Here's the catch: when you eventually sell, the IRS "recaptures" all the depreciation you took at a flat 25% rate. Even if your normal marginal tax rate is lower than 25%, recapture is still 25%. And here's the cruel part — recapture applies whether or not you actually claimed the depreciation while you owned it. So if you forgot to take it, you owe the recapture anyway. Always claim it. Always.

Two ways out of recapture:

1. 1031 exchange. Roll the property into another investment property and defer the recapture into the next building. You can keep doing this for life.
2. Hold until you die. Your heirs get a stepped-up basis to market value at the date of death — which wipes out all the deferred depreciation along with the deferred capital gain. The whole tax bill disappears.

This combo — depreciate while you hold, 1031 to defer when you sell, step-up at death — is the engine behind a lot of generational real estate wealth in America.

Cost segregation and bonus depreciation — the advanced move

For larger properties (usually $500K+), an advanced strategy called cost segregation is worth knowing about. A cost-seg study has an engineer break the building into components — appliances, carpeting, landscaping, electrical fixtures, etc. — that depreciate on shorter timelines (5, 7, or 15 years instead of 27.5).

When combined with bonus depreciation rules (which let you front-load multi-year deductions into year 1), it's possible to write off 20-40% of the purchase price as a tax deduction in the first year of ownership. The cost-seg study itself runs $3-7K. For high-income investors with big enough properties, the math usually pencils very fast.