Real Estate InvestingAdvanced7 min read

Depreciation: the landlord's tax shield

How the IRS lets you deduct the cost of a building that's actually going up in value — and why it matters more than most investors realize.

Depreciation is the IRS allowing you to deduct the cost of your rental property over its "useful life" — 27.5 years for residential property, 39 years for commercial. This is a paper deduction. You don't actually spend any money. But it reduces your taxable income from the property, sometimes to zero, while you collect real cash flow. It is, without exaggeration, the single biggest tax advantage of owning rental real estate.

The basic math

You buy a rental house for $275,000. The land is worth $50,000 (land is not depreciable). The building is worth $225,000. Divide $225,000 by 27.5 years: you can deduct $8,182 per year from your rental income. If the property generates $12,000 in net rental income, you only pay taxes on $3,818. The other $8,182 is sheltered by depreciation. Your effective tax rate on that rental income just dropped dramatically — and you didn't spend a dime to claim it.

Cost segregation: accelerating the deduction

Cost segregation is an engineering-based study that reclassifies components of your building into shorter depreciation schedules. Instead of depreciating everything over 27.5 years, items like appliances, carpeting, landscaping, parking lots, and certain fixtures get reclassified to 5, 7, or 15-year property. Combined with bonus depreciation, this can let you front-load massive deductions in year one. A cost segregation study on a $500,000 property might identify $125,000 in accelerated deductions. That's real tax savings in the year you buy.

Cost seg isn't free money

A cost segregation study costs $3,000–$10,000 depending on the property. It only makes financial sense on properties worth roughly $300,000 or more. And every dollar of accelerated depreciation you take now is a dollar you can't take later — you're moving deductions forward in time, not creating new ones. The benefit is the time value of money: a dollar of tax savings today is worth more than a dollar of tax savings in year 20.

Depreciation recapture: the bill comes due

When you sell a depreciated property, the IRS "recaptures" the depreciation you claimed. The recaptured amount is taxed at 25% (as of current law), regardless of your ordinary income tax bracket. If you claimed $80,000 in depreciation over your holding period, you owe $20,000 in recapture tax at sale — on top of any capital gains tax. This is why 1031 exchanges pair so well with depreciation: the exchange defers both the capital gains and the recapture. The two strategies are designed to work together.

The real estate professional status loophole

Normally, rental losses (including depreciation) can only offset passive income — not your W-2 salary. But if you or your spouse qualifies as a "real estate professional" under IRS rules (750+ hours per year in real estate activities, and more time in RE than any other profession), those losses become non-passive. Suddenly, depreciation from your rental properties can offset your spouse's $300,000 surgeon salary. This is one of the most valuable tax statuses available to high-income households. It's also one of the most audited.

Keep meticulous time logs if you claim real estate professional status. The IRS will ask for them. "I worked a lot on my rentals" is not sufficient documentation. Calendar entries, property management records, and contemporaneous logs are what survive an audit.

Put this into practice

Worth tracks your accounts, budgets, and goals — so the concepts in this article aren't just theory.

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