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A cost segregation study breaks a rental property into its components so that parts of it can be depreciated over shorter periods than the building itself. The result is a larger deduction in the early years of ownership, and for some owners that’s valuable.
It isn’t a must-have, though. It’s a decision with real points on both sides, and the right answer depends on the property and on the owner’s tax picture. Below are five of each, so you can see what goes into that evaluation before you start calling providers.
5 positives of a cost segregation study
These are the reasons owners pursue a study, and the conditions that tend to make each one pay off.
1. Accelerated depreciation deductions. Instead of depreciating the entire residential rental building over 27.5 years, or 39 for a short-term rental, a study identifies components that qualify for shorter depreciation periods, generally 5, 7, or 15 years. This can substantially increase deductions in the early years.
2. Bonus depreciation. Under current federal law, qualifying property acquired and placed in service after January 19, 2025 generally qualifies for 100% bonus depreciation. For properties with substantial qualifying components or improvements, that can produce a significant first-year deduction.
3. Improved cash flow. Larger depreciation deductions reduce current income taxes, which leaves cash available for improvements, debt reduction, or future investments. The benefit here is primarily deferral, though having the cash on hand today can be useful.
4. Properties purchased in prior years. A study isn’t limited to a property you just bought. Owners of rentals purchased several years ago may be able to use Form 3115 to catch up on missed depreciation without amending prior-year returns, and that catch-up generally lands as a current-year deduction.
5. Coordination with other positions. Cost segregation tends to produce a better result when it’s timed alongside other parts of your tax picture, including real estate professional status, short-term rental material participation, and expected changes in income.
5 things to consider before proceeding
None of these rule a study out. They’re the places where the benefit can come in smaller than expected, or arrive later than planned.
1. Depreciation recapture when you sell. Accelerating depreciation today can increase taxable gain at the sale. Gain attributable to certain accelerated deductions may be subject to ordinary-income recapture rather than the more favorable capital gains rates. Anticipated holding period can affect the decision, making it less favorable for properties expected to be sold in the next few years.
2. Passive activity loss limitations. This is the biggest misconception I run into. A large depreciation deduction doesn’t automatically translate into immediate tax savings. For many rental owners, passive activity loss rules suspend those deductions until there’s sufficient passive income or another qualifying event occurs.
3. Cost of the study against the benefit. Professional studies aren’t free, and the potential savings don’t always justify the expense. Smaller properties, and properties with a low depreciable basis or a short remaining holding period, often don’t produce enough benefit to make a study sensible.
4. State tax treatment. Not every state follows federal bonus depreciation rules. Some require adjustments that effectively spread the deductions over a longer period, which complicates reporting and reduces the immediate benefit for anyone filing in more than one state.
5. Plans change, especially with real estate. A property might be sold sooner than anticipated or converted to personal use. Changes in income or tax rates can also affect the expected benefit. A study is generally evaluated against several possible outcomes rather than the most optimistic one.
Putting the two lists together
Read side by side, the ten points come down to two questions, and I work through both before recommending a study to anyone.
The first is how much of the deduction you can use this year. That’s where the passive activity loss rules come in. Disallowed passive losses generally carry forward indefinitely and can offset future passive income, or become deductible when the property is sold in a qualifying taxable transaction. The deductions aren’t lost, so the question is less about the size of the deduction and more about the year it does you some good. An owner with passive income from other rentals, or with real estate professional status, often sees the benefit right away. An owner with mostly wage income may wait several years.
The second is how long you plan to hold the property. Depreciation taken during ownership reduces the adjusted basis, which increases the taxable gain at sale. Some of that gain may be taxed at ordinary rates, and gain attributable to depreciation on real property may be subject to a maximum federal rate of 25%. Over a long hold, accelerating deductions is usually a good trade. Over a short one, you may be moving a deduction forward a few years and paying for the study to do it.
Once those two are answered, the cost of the study against the expected benefit is arithmetic, and so is the state question.
I like to get together with clients between May and November to go through the current year’s plan, and this is a good example of something better decided in that conversation than at tax time. If you’re looking at a property and wondering where it lands, put something on the calendar and we’ll work through it together.
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