Ranking Names Top Tax-Saving Markets for STR Cost Segregation

A tax advisory firm called Cost Seg Smart has published a ranking of ten short-term rental markets it says generate the biggest first-year tax deductions for owners who commission a cost segregation study. The ranking itself is a marketing exercise, but the underlying tax mechanism is real money for STR owners, and it just got more valuable this year.

How cost segregation studies work for short-term rentals

A standard rental property depreciates over 27.5 years for residential or 39 years for commercial use. Cost segregation is an engineering-based study that reclassifies parts of that property - flooring, cabinetry, appliances, landscaping, furnishings - into shorter five-, seven- and fifteen-year categories. Instead of spreading those costs evenly over decades, an owner front-loads the deduction into the first few years of ownership, sometimes the first year alone. For a furnished short-term rental, which typically carries far more depreciable personal property than a long-term lease, the studies tend to surface a larger share of reclassifiable costs than they would on an unfurnished single-family rental.

Why the timing matters now

Bonus depreciation, which lets owners deduct a set percentage of that reclassified property immediately rather than over its shortened schedule, had been phasing down since 2023 under the 2017 tax law - 80% that year, 60% in 2024, 40% this year, on a path to zero by 2027. Congress reversed course this summer, restoring 100% bonus depreciation for qualifying property placed in service after January 19, 2025. That change is what makes a cost segregation study worth commissioning again for many owners who might have shrugged it off a year ago, when the immediate write-off had shrunk to less than half the property's reclassified value.

None of this changes the separate rule that determines whether an STR owner can actually use the loss. Properties with an average guest stay of seven days or less are treated as an active trade or business for depreciation purposes, but only if the owner materially participates - generally 100 hours of involvement and more than anyone else, or 500 hours outright. Miss that threshold and the deduction becomes a passive loss, carried forward rather than used to offset W-2 or business income the same year.

What the ranking doesn't tell operators

The published list doesn't spell out its methodology in enough detail to say how it weighs the variables that actually drive a study's payoff: acquisition price, the age and condition of the building, how much of the purchase price is tied up in furnishings versus the structure itself, and the buyer's own tax bracket. Two identically priced cabins in the same market can produce very different first-year deductions depending on how they were furnished and financed. A market ranking is a starting point for a conversation with a tax professional, not a substitute for one - and a cost segregation study, which commonly runs from a few thousand dollars to well over ten thousand depending on property size, is itself a cost that needs to pencil out against the deduction it unlocks.

For portfolio operators weighing new acquisitions, the practical takeaway isn't which city topped somebody's list. It's that the math behind accelerated depreciation just changed materially, and any STR purchase closing now is a candidate for a study that would have delivered a smaller check a year ago.