As an Airbnb or short-term rental (STR) owner, maximizing your return on investment is paramount. A Cost Segregation Study is one of the most powerful tax strategies available to property investors. By accelerating depreciation, we can help you significantly reduce your current tax liability and immediately increase your cash flow, giving you more capital to grow your business.
By default, a residential rental property is depreciated over 27.5 years. A Cost Segregation Study is an in-depth, engineering-based analysis that identifies and reclassifies components of your property—such as landscaping, flooring, and fixtures—into much shorter 5, 7, or 15-year recovery periods. This allows you to take substantial depreciation deductions in the first few years of owning the property rather than waiting decades.
The benefits are immediate and substantial: You can front-load your deductions for massive tax savings in the early years of ownership, which directly translates to increased cash flow that you can reinvest or save. For the full mechanics behind the strategy — including why short-term rentals actually depreciate over 39 years, not 27.5 — see our guide to short-term rental cost segregation.
One honest caveat before you get excited: accelerated depreciation is recaptured when you sell, and the components a study reclassifies come back at ordinary income rates rather than the 25% cap that applies to the building shell. That makes your hold period the single biggest factor in whether a study pays off — under three years it usually doesn't. We walk through the exit math with real numbers in depreciation recapture: what cost segregation costs you at sale.
Already owned your property for years? Even better.
Through a look-back study using IRS Form 3115 (Application for Change in Accounting Method), you can claim a large, one-time "catch-up" deduction for all the accelerated depreciation you previously missed—without amending prior tax returns. This Section 481(a) adjustment brings years of missed deductions into your current tax year, creating an immediate windfall that can offset your income and put thousands back in your pocket.
A short-term rental example
Suppose you buy a furnished Airbnb for $650,000, with roughly $520,000 allocated to the depreciable building and improvements after removing land value. Because the average guest stay is under 30 days, the IRS treats it as nonresidential — a 39-year schedule — so straight-line depreciation alone would produce only about $13,000 in year-one deductions.
A cost segregation study typically reclassifies 25–35% of that basis into 5-, 7-, and 15-year property — the furniture, appliances, flooring, and fixtures that make a furnished rental function. On this property, that might mean roughly $166,000 reclassified. Under current law, 100% bonus depreciation lets that entire amount be deducted in year one, pushing the total first-year deduction to roughly $175,000 — about $162,000 more than the default schedule, or around $60,000 off your tax bill at a 37% rate.
For illustration only — your results depend on your property and tax situation, and this is not a projection of actual savings.
Curious what the study itself costs? For most properties the fee is a small fraction of the first-year savings — see what a cost segregation study costs and how to tell if it's worth it for your property.
Short-term rental questions, answered
Is my Airbnb depreciated over 27.5 or 39 years?
Usually 39 years. If your property's average guest stay is 30 days or less, the IRS classifies it as nonresidential — the same category as a hotel — rather than the 27.5-year schedule that applies to long-term rentals. That slower default schedule is exactly why a cost segregation study delivers an outsized benefit for short-term rental owners.
Can a cost segregation study on my STR offset my W-2 income?
It can, if your average guest stay is seven days or less and you materially participate in running the property. In that case, the IRS treats the rental as a nonpassive business rather than a passive activity, so the loss the study creates can offset active income — your salary or business profit — not just rental income.
How much of my short-term rental's value can be reclassified?
For a furnished short-term rental, typically 25–35% of the property's value — often higher than an unfurnished long-term rental, since furniture, appliances, and decor all qualify for accelerated 5- and 7-year depreciation. Under current law, that entire reclassified amount can be deducted in year one rather than spread across decades.