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What Is Cost Segregation — And How Much Tax Can It Save On Your Building?

Buy a commercial building and the IRS hands you a default deal: depreciate it over 39 years, one thirty-ninth of the value deducted per year. Simple. Also, for almost every dental building, wrong — or at least far slower than the rules actually require.

Because your building isn’t one asset. The cabinetry in it depreciates over five years. The carpet, seven. Landscaping and site improvements, fifteen. Lump it all into the 39-year bucket and you’re volunteering to wait decades for deductions the tax code lets you take now.

Fixing that is called cost segregation, and Carole Lieberman Stabile has spent the last five years doing little else. She’s a national account executive with CSSI — Cost Segregation Services, Inc. — which has performed more than 50,000 engineered studies over 20-plus years without ever triggering an audit. Before that she spent a career as a commercial real estate broker in metro Detroit, which is why she explains this better than most accountants. We had her on the Dentelligentsia podcast to de-mystify the tax strategy every building-buying dentist should at least price out.

The concept in one paragraph

A cost segregation study is an engineered analysis that sorts your purchase and buildout into the correct depreciation buckets — the five-year components into the five-year bucket, the seven-year into seven, the fifteen into fifteen — instead of letting everything default to 39. The study attaches to your tax return and front-loads your deductions into the early years of ownership, exactly when a new owner drowning in loan payments needs them. Typically somewhere around 15 to 20 percent of the building’s value moves into the accelerated buckets; you still depreciate the rest every year after, just less. And the clock resets at purchase: the building can be 100 years old, but your depreciation — and your study — starts fresh the day you buy it.

Stabile’s summary is the whole pitch: “It’s about the time value of money. Money now is better than money later. Not rocket science.”

To be precise about what you get: not a refund check. The study creates deductions that flow through your ownership entity to your personal return, reducing the income you pay tax on. Her Michigan example makes it concrete — a client bought a building for about $1 million, and the first-year study saved roughly $75,000 in taxes. After a $500,000 buildout, an updated study added about $50,000 more. Call it $120,000-plus kept, usable in year one or spread across the first five years of ownership, on a fee that’s a small fraction of the number. Across her book, the return on the study fee typically runs 10-to-1 and can reach 25- or 40-to-1 — and medical buildings are the best candidates of all, because all those cabinets, countertops, and sinks are exactly the fixture-heavy content that accelerates.

Who it’s for (and who it isn’t)

The threshold is lower than most owners assume: cost segregation starts making sense at property costs around $200,000 — which is nearly every dental building. It applies to commercial and income-producing property, including, to our surprise, single-family rentals and short-term rentals (those depreciate over 27.5 years, and CSSI does them constantly). It is not for your personal residence, and it’s not for flippers: if you sell within a couple of years, depreciation recapture eats the benefit. Plan to hold for three years or more and the math works. One hard cutoff: if you’ve owned the building more than ten years, the opportunity has passed.

Timing on the other end matters too. The study can’t happen until the building is in use — so on a ground-up or major buildout, you wait for occupancy and run one study that captures everything. If you’ve owned and depreciated the building for a few years already, the fix is a change-of-accounting form (Form 3115, a modest add-on fee) — and no, you haven’t missed out; the study claws the difference forward.

The three objections, answered

Stabile hears the same three every week.

“It sounds too good to be true.” Her Lansing client said exactly that — how do I suddenly have an extra $70,000? The answer is that accelerated depreciation isn’t a loophole; it’s the correct way to depreciate assets that genuinely wear out faster than a building shell. In her framing, it’s Treasury policy working as intended: keeping cash in the hands of the business owners who put it to work. “Any time you have a chance to take an interest-free loan from the IRS, you should do it.”

“It’ll trigger an audit.” In 50,000-plus studies, CSSI has never had a study trigger one. If a client is audited for any other reason, the firm supports the study — documentation, representation on the study itself — at no charge. The site surveys are done in person, not by drone, and the file is built to be exactly what an auditor wants to see.

“My CPA handles that.” Gently: no, and that’s not a criticism. CSSI’s biggest referral source is CPAs, because a general accountant’s job is broad — keep you compliant, keep you out of trouble — while an engineered study is a narrow, deep specialty. The only things the study needs from your CPA are the building’s cost basis net of land (land doesn’t depreciate; figure roughly 20 percent as a rule of thumb, though the exact number has to match) and, for an owned building, the existing depreciation schedule. Partnerships aren’t a complication either — the benefit simply divides by ownership percentage, delivered to each partner’s accountant.

The process is two steps, and the first one is free

Here’s the part that should remove all hesitation. Step one is an estimate: address, purchase price, purchase date, planned improvements. That’s the entire ask — no fee, no site visit, no commitment — and back comes a conservative projection of what the study would save, which you can hand to your CPA and evaluate like any other number in the deal. Stabile is emphatic about the no-pressure part: “I give you the estimate, you tell me whether you want to do it, and if it’s no — I disappear.”

Step two, if the numbers justify it, is the engagement: a site survey, the engineered study, done in two to four weeks, attached to your return.

Which is why our takeaway for clients is to get the estimate during the deal, not after. It costs nothing, and it can legitimately inform a lease-versus-buy decision — a six-figure first-year tax benefit is a real thumb on the scale for ownership. It’s one more number in the decision matrix, delivered free.

Two bonus items from the conversation. For larger buildings — over 20,000 square feet — a separate study (the 179D energy deduction) applies when you’ve installed new roof, HVAC, or lighting, typically worth on the order of a dollar-fifty or more per square foot at a fee of pennies per square foot. And on bonus depreciation — the rule that at its peak let owners take 100 percent of the accelerated buckets in year one — the percentages have swung with every recent tax bill, sometimes retroactively. The strategy works at any bonus level; have your CPA model the current-year rules before you count the exact dollars.

The story that sells it

Stabile’s favorite client is an auto-repair chain owner in metro Detroit whose accountant told him he didn’t need cost segregation — it was handled. The first study on one facility found $50,000 the accountant didn’t know was there. They’ve since done his other five facilities and headquarters: more than $250,000 in tax savings, from properties nobody would call glamorous. “You wouldn’t think you could find depreciation in an auto repair facility,” she said. “With doctors and dentists, there’s a lot more meat.”

Her parting advice was the same one she’d give her 20-year-old self, from a career spent as one of very few women in commercial real estate: don’t take any of it too seriously, know your expertise, and let them see it. And her definition of a perfect day — museum mornings in Florence, three studies signed from a rented apartment in the afternoon — is its own argument that she’s found a corner of the tax code worth enjoying.

The full conversation with Carole Liberman Stabile, “Dentists Can Save Big With These Smart Cost Segregation Tips,” is on the Dentelligentsia podcast. And if you’re weighing a building purchase and want the cost-seg estimate folded into the lease-versus-buy math from the start — talk to us.

And follow Carole Liberman Stabile on Linked In or check out the Cost Segregation Services Inc. website.