When to do a cost segregation?

Question

When I read or hear about cost segregation, it seems to be exclusive to STR. Is that accurate? If not, when should I do one?

Context: We own a duplex in Chesapeake, VA and put $57K into it in 2024 and $13K again (flooring repairs) in 2025. We've spent a good amount of money getting it up to rental condition. Should we do a cost segregation?

Jason Malabute · Answer

Cost segregation isn't limited to short-term rentals — it can be done on most rental property, including a duplex — but whether it actually makes sense for you is very case-by-case and turns mostly on whether you qualify for real estate professional status or fall under the short-term rental rules, whether you have other passive income to absorb the loss, and whether your tax bracket is high enough that the deduction is meaningful after factoring in the study cost and the depreciation recapture down the road. The right answer really depends on your full picture, so I'd walk through it with a CPA who works with real estate investors before scheduling a study.

David Casper · Answer

Cost segregation definitely isn’t exclusive to STRs. The reason you hear about it so much with STRs is because STR owners can sometimes use the losses more aggressively depending on their participation and average guest stay.

But cost seg applies to almost all types of income-producing real estate: long-term rentals, duplexes, multifamily, retail, office, industrial, self-storage, mobile home parks, and more.

What a cost seg study does is break portions of the property out of the normal 27.5- or 39-year depreciation schedule into shorter-life assets like 5-, 7-, and 15-year property. That accelerates depreciation and can create substantially larger deductions in the earlier years of ownership.

In your case, it could absolutely be worth exploring, especially since you’ve put a meaningful amount into improving the property. A lot of people assume cost seg only makes sense for massive apartment complexes, but that’s really not true anymore. We regularly see smaller residential investment properties benefit from it as well.

The main factors are usually:

• Total depreciable basis
• The amount and type of improvements
• Your income and ability to use the losses
• How long you plan to hold the property

One thing I always tell people is that cost segregation isn’t “creating” deductions out of thin air. It’s accelerating depreciation you would normally take slowly over decades into earlier years where it can often be much more valuable from a cash flow and tax-planning standpoint.

Feel free to reach out if you’d like. I’d be happy to put together a free proposal so you can see what the projected tax benefit might actually look like for your property.

Ryan Coon · Answer

Great question, Patrick. Cost segregations can be extremly powerful tools, however, the "when" and "why" usually boil down to a few very specific levers.

Here is a high-level breakdown of how it works and the primary factors you should consider before pulling the trigger.

The 1,000-Foot View: How it Works

Normally, residential rental property is depreciated over 27.5 years (or 39 years for commercial property). A Cost Segregation study "unbundles" the property, identifying components like flooring, cabinetry, or landscaping that actually have a shorter lifespan (5, 7, or 15 years).

By reclassifying these items, you "harvest" or accelerate those depreciation losses into the first few years of ownership rather than waiting decades.

The Big Hurdle: Passive vs. Active Losses

The most critical factor is how you can use those losses. By default, rental income is "passive." This means the massive depreciation you unlock by depreciating a rental property can usually only offset other passive income (like rental profits). If you don't have enough passive income to offset, those losses just sit "suspended" for future years.

The real power of a cost seg is unlocked if you can convert those losses to active, allowing them to offset your W-2 or business income. This typically happens via two paths:

• The      STR Loophole: If your average guest stay is 7 days or less (or 30 days or less with substantial services) and you      meet Material Participation tests, the income is not      considered passive.
• Real      Estate Professional Status (REPS): If you or a spouse qualify as a      REPS and meet material participation those      losses can offset active income.

Decision Point: If you don't meet one of these, you need to ask: Do I have enough other passive income to make this study worth the immediate cost?

Timing and Bonus Depreciation

The value of a study also fluctuates based on when
you bought the property and how long you've held it:

• Bonus      Depreciation Phase-out: Depending on the year you placed the property      in service, you may not get 100% bonus depreciation. The percentage was      "stepping down" annually prior to the Big Beautiful Bill (e.g.,      60% in 2024, 40% in 2025), which impacts the "size" of the      immediate tax punch. The good news is that the Big Beautiful Bill brought      back full 100% bonus depreciation as of Jan 19, 2025
• Ownership      History: If you’ve owned the property for several years already, you      have already used up some of that depreciation. The "catch-up" might still be worth it, but the total pool of available      losses to harvest is smaller than if you had done it in Year 1.

Summary Checklist

• Utilization:
     Can I use these losses against my W-2 income (STR/REPS), or do I have      other passive income to offset?
• Bonus      %: What was the "bonus depreciation" rate for the year I      placed this in service?
• ROI:
     Does the immediate tax savings (NPV) significantly outweigh the $3k–$10k      cost of the study itself?

For your duplex, since you’ve put in $70k recently, you’ve essentially created a new "bucket" of assets to depreciate. A CPA can help you run a "ballpark" analysis to see if the juice is worth the squeeze before you pay for a full study.Note: This information is for
educational and informational purposes only and does not constitute legal,
tax, or financial advice. No attorney-client, fiduciary, or professional
relationship is established through this communication.

Jason Malabute · Answer

Cost seg isn't an STR only play. It works on long term rentals, multifamily, and commercial property too, since it is really about identifying components of the building that fall into shorter 5, 7, or 15 year recovery classes instead of the building's 27.5 or 39 year life. For a duplex with around $70K of improvements, the real question is whether you can actually use the resulting depreciation losses now. If you don't qualify for REPS or the STR rules and don't have other passive income to offset, those losses likely just sit suspended until a later year. The study itself also costs money, so the tax benefit needs to comfortably exceed the fee. The right answer depends on your overall income picture and how the costs were classified between repair and capital improvement, so it is worth running it by a CPA who works with real estate before paying for the study.

Jake Yuskaitis · Answer

cost seg is not exclusive to SFR. this can be done over the useful life of the property. 27.5 yrs for residential and 39 years for commercial properties.

you'll see the most benefit from larger properties as cost seg is expensive. I've helped client before with this typically at 5+ unit MF props.

This can also be done when there are significant improvements to the property that are depreciated and not expensed. hope this helps. happy to answer questions.

Malik Javed · Answer

@Patrick Croffie Cost segregation is definitely not limited to STRs. It can apply to long-term rentals, multifamily, commercial properties, etc. The main question is whether the tax benefit is large enough to justify the study cost.In your case, a duplex with around $70K of improvements may be too small for a cost seg study. However, one important question is: what was the original acquisition price of the property? Depending on the numbers, it may make sense to look at both the acquisition and the improvements together rather than just the improvements alone.Also, if you’ve owned this duplex for a while, it may make sense to review the repair vs. capital treatment. There could be certain costs that may be expensed instead of capitalized

Ashish Acharya · Answer

Hey Patrick, like others mentioned above, cost segregation is not exclusive to STRs. It can be used on long-term rentals, multifamily, commercial, and STRs. The reason you hear about it more with STRs is because STR losses may be easier to use against active income if you materially participate, while long-term rental losses are often passive unless you qualify for REPS or have other passive income.

For your duplex, the first step is separating repairs from improvements. Flooring, renovations, and work to get the property ready for rental condition often need to be capitalized and depreciated, while true repairs may be deductible sooner. A cost seg could help accelerate some depreciation, but with roughly $70K of improvements, the study cost may or may not pencil unless your taxable income situation allows you to actually use the losses.

I’d run the numbers before paying for a study. If the losses will just be suspended, it may still help long term but not create much immediate benefit. If you can use the losses now, it may be worth exploring.

This is a to find great CPAs who understand real estate and cost segregation. Many CPAs work remotely now, so you can speak with a few and choose the one that best fits your needs.

Happy to connect!

Michael Plaks · Answer

I forgot to suggest this article:https://www.biggerpockets.com/forums/51/topics/1075919-five-...

When to do a cost segregation?

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