Cost segregation can turn a rental property into a large deduction in the year you buy it. It can also be a waste of money on the wrong property. Here is how to tell the difference.
How depreciation normally works
When you buy a residential rental, the building is generally depreciated over 27.5 years. Commercial property is depreciated over 39 years. Land doesn't depreciate at all. That means most of the deduction from your purchase is spread thinly over decades.
What a cost segregation study does
A cost segregation study breaks the property into its components. Things like appliances, carpet, cabinetry, certain electrical and plumbing, landscaping, driveways, and fencing often qualify for much shorter lives of 5, 7, or 15 years instead of 27.5 or 39. Moving those components into shorter categories pulls a large share of the depreciation into the early years of ownership.
Under current law, 100 percent bonus depreciation is available for qualifying property acquired after January 19, 2025. Combined with a cost segregation study, that can allow a significant portion of a property's cost to be deducted in the first year.
When it tends to be worth it
- Higher value properties, where the tax savings clearly outweigh the cost of the study.
- Properties you plan to hold for several years.
- Situations where you can actually use the deduction, such as real estate professional status or a qualifying short term rental.
- Recent purchases or renovations, though studies can also be done on property you already own.
When it may not be
If the property is small, the study fee can eat up most of the benefit. If your rental losses are passive and you have no passive income to offset, a big deduction may just carry forward instead of saving you tax now. And if you plan to sell soon, keep in mind that accelerated depreciation can be recaptured and taxed when you sell.
Can losses offset your other income?
This is the question that decides whether cost segregation is a home run or just a nice to have. For most people, rental losses are passive. They can offset your W2, business, or commission income only if you qualify as a real estate professional and materially participate, or if the property qualifies under the short term rental rules. Planning that piece first is what makes the study pay off.
The bottom line
Cost segregation is a powerful tool when the property is the right size, you'll hold it long enough, and you can actually use the deduction. Look at all three before you order a study.
This article is general information, not tax or legal advice for your situation. Tax rules change and the details matter, so talk with a qualified advisor before acting on any strategy.