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Why You Should Do a Cost Seg Analysis Before You Close — Not After

by PracticeCFO | April 29, 2026
Two people in business attire discuss charts on a tablet, showing blue pie charts. Papers, calculator, and pens are on a table nearby, suggesting an analytical meeting.

Most dentists who implement cost segregation do so after they have already closed on their building. The study gets commissioned in year one of ownership, the results get filed with the tax return, and the dentist considers it done. That approach works. But it leaves value on the table. In Episode 152 of The Dental Boardroom, Wes Read makes the case for doing a preliminary cost segregation analysis during due diligence — before you sign.

What a Pre-Purchase Cost Seg Analysis Tells You

When you are under contract on a building — while attorneys are negotiating, lenders are underwriting, and inspectors are inspecting — a preliminary cost seg analysis gives you three things that are difficult or impossible to get after closing.

1. The True After-Tax Cost of the Building

Two buildings with the same purchase price can have very different after-tax costs depending on how their interiors are composed. A dental office with a full clinical buildout — specialized plumbing, HVAC, cabinetry, and equipment infrastructure — contains a much higher percentage of 5-, 7-, and 15-year property than a bare commercial shell.

That means the dental-rich building generates far more accelerated depreciation in year one, and its true after-tax cost is meaningfully lower. A preliminary cost seg analysis lets you see this before you close, so you are comparing buildings on the right basis — after-tax net cost, not just sticker price.

2. Leverage in the Purchase Agreement

How the purchase price is allocated between land, building, and personal property in the purchase contract directly affects your depreciation. Land is never depreciable — so the higher the land allocation, the smaller your depreciable base.

This allocation must be negotiated. The seller has an incentive to push value toward land and building, since those attract lower capital gains tax rates for them. You have the opposite incentive. The time to negotiate this is before you sign, not after you close. A preliminary cost seg analysis gives you the data to support your proposed allocation, and a defensible methodology to present to the seller's team.

This is directly analogous to the asset allocation negotiation when you buy a dental practice — how much goes to goodwill, equipment, non-compete, and accounts receivable. The building purchase deserves the same rigor.

3. The Land Allocation Problem

In high-cost markets like Southern California, appraisers sometimes allocate a disproportionately large percentage of a property's value to land. Since land is excluded from all depreciation, a high land allocation dramatically reduces your depreciable base and your tax benefit.

A qualified cost seg firm can help you establish a defensible, documented land-versus-improvement allocation before closing. This gives you both a negotiating anchor and a paper trail that supports your tax position if the IRS ever questions it.

If you can get a preliminary cost seg analysis done during due diligence, do it. The information the study provides is worth more than the cost of the study itself. You will make a better-informed buying decision, negotiate a stronger purchase agreement, and start your ownership with a tax position that is already optimized — not one you are trying to fix after the fact.

Listen to Episode 152 of The Dental Boardroom Podcast: https://podcasts.apple.com/us/podcast/152-cost-segregation-tax-strategy-for-dentists-part-4/id1518344747?i=1000761993737

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Disclaimer: The marketing materials presented on this website include testimonials that serve as reviews of PracticeCFO Investments’s products and services. PracticeCFO Investments does not compensate clients for reviews or testimonials, and PracticeCFO Investments does not provide anything of value in exchange for these reviews. PracticeCFO Investments has determined that there are no material conflicts of interest between the firm and the participant, and PracticeCFO Investments has not influenced the statement made by the client(s) appearing on this website.
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