The most common thing I hear from rental property owners when cost segregation comes up is some version of: “My CPA mentioned it but wasn’t sure it was worth it for my property.” I’ve heard the same thing from John Murphy at CSSI — he deals with this objection constantly, including on a $3 million industrial building where the owner had been told the same thing. That study produced a $300,000 deduction and over $100,000 in immediate tax savings. They just hadn’t run the numbers first.
So let’s run the numbers. Here’s a straightforward framework for figuring out whether a cost segregation study makes sense for your rental property.
The Basic Threshold: $200,000 in Cost Basis
Murphy’s rule of thumb: if your depreciable building basis is at least $200,000, cost segregation is almost always worth exploring. The study cost at CSSI starts around $2,000. On a $200,000 basis, a study might identify $30,000–$40,000 in shorter-lived components. At a 24% tax rate, that’s a $7,200–$9,600 first-year tax benefit on a $2,000 investment. That’s a 3.5–5x return on the study cost — not accounting for the time value of that money.
For most of CSSI’s clients, the return on the study cost is 10–20x. That’s not a figure I’m inventing — it’s Murphy’s consistent benchmark across thousands of studies.
The 20/20 Rule for Quick Estimates
Murphy teaches a simple back-of-napkin approach he calls the 20/20 Rule for CRE buyers and investors:
- First 20: Allocate roughly 20% of the purchase price to land. Subtract that — it’s not depreciable.
- Second 20: Expect roughly 20% of the remaining building basis to be eligible for 100% bonus depreciation via cost segregation.
Example: You buy a small apartment building for $1.2 million.
- Land at 20%: $240,000. Building basis: $960,000.
- 20% of $960,000 eligible for bonus depreciation: $192,000 first-year deduction.
- At 35% tax rate: $67,200 in year-one tax savings.
- Without cost segregation, straight-line depreciation produces roughly $34,000 per year — and that $192,000 gets spread over 27.5 years instead of hitting in year one.
The 20/20 Rule is a ballpark, not a guarantee. Some properties see 15%, others 30% or higher. But it gives you a quick sense of the magnitude before you commit to anything.
When Cost Segregation Doesn’t Make Sense
Murphy is straightforward about the exceptions:
- Planning to sell in 1–2 years. The accelerated depreciation gets recaptured at sale (taxed at 25% for unrecaptured Section 1250 gain). If the hold period is very short, the benefit shrinks. A 1031 exchange into the next property can defer the recapture, but if you’re cashing out entirely, run the math carefully with your CPA first.
- 1031 exchange with low new basis. If you exchanged into a property with carryover basis, the depreciable basis may be smaller than the purchase price suggests. CSSI needs the actual carryover basis from your CPA to generate an accurate estimate.
- Can’t use passive losses. If you’re a W-2 earner without real estate professional status, the accelerated depreciation may create passive losses that sit on the shelf until you sell or offset with passive income. Not worthless — they carry forward — but the timing of the benefit changes.
Retroactive Studies: It’s Not Too Late
One thing that surprises most investors: you can go back. About 35–40% of the studies Murphy’s team completes each year are for properties placed in service in prior years. You file IRS Form 3115 and take the entire catch-up depreciation in the current tax year. If you bought a West Metro rental in 2022 and have been depreciating it the slow way, there may be a large deduction available to you right now.
The Process Is Low-Risk to Start
Murphy’s process is built to remove the guesswork: he runs a free estimate based on your property details and delivers a PDF showing projected numbers. You take that to your CPA and have an informed conversation. No charge until you decide to move forward with the actual study. Studies can be done in time for an extended tax filing deadline — but the closer you get to that deadline, the harder it is to guarantee completion.
If you own rental property in Plymouth, Minnetonka, Eden Prairie, Hopkins, or anywhere in the West Metro with a cost basis above $200,000 and you haven’t had a conversation about cost segregation, you’re probably leaving real money behind.
Let’s Talk
I can connect you directly with John Murphy at CSSI for a free estimate. No sales pressure — just numbers. If it makes sense, you’ll know. If it doesn’t, you’ll know that too.
Reach out at 952-994-4451 or through the contact form and I’ll make the introduction.