On most Airbnbs a cost segregation study is worth it, subject to two conditions: the property needs enough building basis to generate a meaningful deduction, and you need a way to actually use the resulting loss in the year it lands.
What cost segregation finds in a short-term rental
Short-term rentals tend to screen well because they are component-heavy. Appliances, flooring, window treatments, decks, patios, fencing, landscaping, and driveways all leave the 39-year building shell and move into 5, 7, and 15 year classes, the framework the IRS Cost Segregation Audit Techniques Guide describes. Screening results for residential-style STRs commonly fall in the 20 to 35 percent range of building basis. The baseline matters too: because a transient-use rental is 39-year property under IRS Pub 946 rather than 27.5, straight-line depreciation is slower, which makes acceleration more valuable, not less.
A worked first-year example
Take a $600,000 Airbnb acquired and placed in service in January 2026, with $90,000 allocated to land and $510,000 of building basis. Straight-line alone produces roughly $12,500 in year 1. Suppose a study reclassifies 28 percent, or $142,800, into short-life classes. Under IRC section 168(k), with 100 percent bonus depreciation permanent for qualified property acquired after January 19, 2025 under the July 2025 law, the full $142,800 is deductible in year 1, plus roughly $9,000 of straight-line on the remaining $367,200. Total: about $151,800 against $12,500 without the study. At a 32 percent marginal rate that is roughly $44,600 of federal tax deferred, assuming the loss is usable.
The usability conditions
A deduction that large almost always creates a rental loss, and section 469 decides whether you can touch it. Three paths work. First, the short-term rental loophole: an average guest stay of 7 days or less under Reg 1.469-1T(e)(3) plus material participation under Reg 1.469-5T makes the loss non-passive against W-2 or business income. Second, passive income from other rentals or syndications can absorb a passive loss. Third, real estate professional status for owners with longer-stay properties. If none apply, the loss is suspended under section 469(b) and carries forward. It is delayed, not destroyed, but delay guts the first-year economics.
When it is not worth it
Skip or defer the study when land takes an outsized share of the purchase price, when you plan to sell within a year or two, since section 1245 recapture on the short-life property claws back much of the benefit at sale, when the building basis is small enough that the study fee eats the savings, or when you simply cannot use the loss and your state does not conform to bonus depreciation. Screen before you spend. Amadae's cost segregation screen estimates the reclassification and first-year benefit, explicitly a screening estimate rather than an engineering study, and Amadae coordinates with engineering firms, prepares the Form 3115 catch-up when a look-back applies, and files the return that uses the result.