Cost Segregation

Cost segregation is a tax study that breaks a building into its shorter-life parts so you can depreciate those parts faster than the standard schedule. Instead of writing off the whole structure over 27.5 years, an engineer reclassifies items like appliances, carpet, cabinets, and site work into 5-year, 7-year, and 15-year buckets, which front-loads your deductions into the early years of ownership.

In practice

Say you buy a duplex for $340,000 and the land is worth $60,000, leaving a $280,000 building basis. Under the normal 27.5-year schedule, you deduct roughly $10,182 a year ($280,000 ÷ 27.5). Now a study finds that $56,000 of that basis is really 5-year and 15-year property: $28,000 of appliances and flooring, plus $28,000 of driveway, fencing, and landscaping.

That $56,000 now depreciates over 5 and 15 years instead of 27.5. The remaining $224,000 stays on the 27.5-year line. The reclassified $56,000 can also qualify for bonus depreciation, which lets you take a large chunk of it in year one rather than spreading it out. A study like this typically costs $2,000 to $5,000 for a small residential property, so the deduction it pulls forward has to be worth more than that fee and the time value of the deduction you would have gotten anyway.

Why it matters to a small landlord

Front-loaded deductions only help if you have income to absorb them. For most landlords with a regular job, rental losses are passive and can be limited in the year you claim them, so a big paper loss may sit unused until you sell. The other catch is the back end: accelerating depreciation grows the amount of depreciation recapture you owe when you sell, taxed up to 25 percent. The study is a timing play, not free money, and it pays best when you plan to hold for years or can offset the income with other deductions. Run the broader math in the cost segregation for small residential rentals guide before you call an engineering firm.

Cost segregation lives in the same family as MACRS, the system that sets each component's recovery period, and bonus depreciation, which decides how much of the short-life property you can take up front. Whatever you accelerate, track it carefully, because every dollar you deduct early comes back as depreciation recapture at sale.