“My CPA mentioned it but wasn’t sure it was worth it for my property.” That’s the most common thing I hear when cost segregation comes up with clients. John Murphy at CSSI — a specialist I refer investors to regularly — hears the same thing. He encountered it recently on a $3 million industrial building where the owner had been told the same thing by their CPA. That study produced a $300,000 deduction and over $100,000 in immediate tax savings. They just hadn’t run the numbers first.
Here’s a framework for figuring out whether a cost segregation study makes sense for your rental property — before you ask your CPA.
The Basic Threshold: $200,000 in Cost Basis
Murphy’s practical rule: if your depreciable building basis is at least $200,000, cost segregation is almost always worth evaluating. Studies at CSSI start around $2,000. On a $200,000 basis, the study might identify $30,000–$40,000 in shorter-lived components. At a 24% tax rate, that’s $7,200–$9,600 in first-year savings on a $2,000 investment — a 3.5–5x return on the study cost, minimum. For most clients, the return is 10–20x.
The 20/20 Rule for Quick Estimates
Murphy teaches a back-of-napkin approach called the 20/20 Rule:
- First 20: Allocate roughly 20% of the purchase price to land. Subtract it — land isn’t depreciable.
- Second 20: Expect roughly 20% of the remaining building basis to qualify for 100% bonus depreciation via cost segregation.
Example: You buy a small multifamily in Eden Prairie for $1.2 million.
- Land at 20%: $240,000 — not depreciable
- Building basis: $960,000
- 20% 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 delivers about $34,000 per year. Cost seg delivers nearly twice that in the first year alone — and then the remainder continues depreciating on the standard schedule.
The 20/20 Rule is a ballpark. Some properties hit 15%, others 30% or more. Murphy’s team runs a free estimate with actual numbers before you commit to anything.
When Cost Segregation Doesn’t Make Sense
Murphy is straightforward about the exceptions:
- Short hold period (1–2 years). Accelerated depreciation gets recaptured at sale, taxed as unrecaptured Section 1250 gain at 25%. If you’re selling soon, the math gets tighter. A 1031 exchange into the next deal defers recapture, but if you’re cashing out entirely, run it by your CPA first.
- Low carryover basis from a 1031 exchange. 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 carry forward rather than offsetting income immediately. The losses are still real and valuable — they just hit at a different time.
Retroactive Studies: It’s Not Too Late
35–40% of CSSI’s studies each year are retroactive — covering properties placed in service years ago. You file IRS Form 3115 and capture the entire catch-up depreciation in the current tax year. If you bought a rental in Plymouth, Minnetonka, or elsewhere in the West Metro in 2021, 2022, or 2023 and have been on straight-line, there may be a significant lump deduction available now.
The Process Is Low-Risk to Start
Murphy runs a free estimate based on your property details and delivers a PDF with projected numbers. You take that to your CPA and have an informed conversation with real data — not a guess. No charge until you decide to move forward.
If you own rental property in the West Metro with a cost basis above $200,000 and haven’t had this conversation yet, reach out. I can make a direct introduction to John Murphy at CSSI.
Call 952-994-4451 or use the contact form below.