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5 Steps to Implement Cost Segregation Correctly (For Dentists Who Own Their Building)

by PracticeCFO | April 23, 2026
Stacks of coins on colorful charts, a calculator, and glasses on a wooden desk, conveying financial analysis and planning.

Cost segregation is one of the most powerful tax strategies available to dentist building owners. But the strategy only works if you set it up in the right order, with the right professionals, and with airtight documentation. Here are the five implementation steps Wes Read walks through on The Dental Boardroom EP. 151.

Step 1: Form the LLC Before You Close

This is the single most important step — and the one most often skipped. The LLC must be the purchaser on the deed. That means you need to form it before closing, not after.

Forming an LLC is not complicated. You can do it through LegalZoom for a modest fee. But if you are a practice owner collecting north of a million dollars per year, do not go cheap here. Hire qualified attorneys and advisors to set it up properly from day one.

If you already purchased the building in your personal name or inside your S-Corp, you can still transfer it into an LLC — but it requires the right type of attorney and creates additional tax complexity. Do it right the first time.

Step 2: Close on the Building

Once the LLC is formed, it closes on the building and obtains its own commercial mortgage. In nearly all cases, the bank will require you to personally guarantee that loan. That means if the LLC defaults, the bank can come after your personal assets — your home, vehicles, and non-retirement investments.

This is completely standard and should not deter you from the purchase. Dentists are considered low-risk borrowers, and commercial lenders are very familiar with this structure.

Step 3: Commission the Cost Segregation Study

After closing, hire a qualified cost segregation firm — typically an engineering company, not your general CPA — to perform a room-by-room analysis of everything inside the building. Their job is to reclassify as many assets as possible from the standard 39-year depreciation category into the shorter 5-, 7-, and 15-year categories.

This study typically costs between $10,000 and $25,000. The fee is worth far less than the tax benefit it generates. Focus on finding a firm with deep experience in dental office builds, not on minimizing the engagement fee.

Step 4: Execute the Lease Agreement

With your LLC in place and the cost segregation study complete, you now need a formal, written, arms-length lease agreement between your Dental S-Corp (the tenant) and your Real Estate LLC (the landlord).

To support the rent rate you choose, commission a market rent analysis from a licensed commercial real estate broker. This document is your protection in the event of an IRS audit. You can point to it and say: a qualified professional analyzed comparable properties and this is the rate they recommended.

Have a real estate attorney draft the actual lease agreement. Do not use a template. Do not do this yourself. The documentation must be airtight.

Step 5: Keep Clean Books

The final step — and an ongoing requirement — is maintaining completely separate financials for the LLC and the S-Corp. Separate bank accounts. Separate QuickBooks files. A clean Chinese wall between the two entities.

Every account you open — checking, credit card — requires its own general ledger account and monthly reconciliation. Keep it simple: most building LLCs need only a single checking account. The fewer accounts you have, the less complexity and the lower your accounting fees.

The moment transactions start crossing between entities without proper documentation, the strategy starts to unravel. Keep it clean from day one.

View Full Episode: https://podcasts.apple.com/us/podcast/151-cost-segregation-tax-strategy-for-dentists-part-3/id1518344747?i=1000761386035

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