Dentist Saves $156K with Cost Seg on Practice Building and Entity Separation

The Problem

This client owned and operated a dental practice generating $1.95M in annual revenue through an S-Corporation. The client also owned the practice building, purchased for $1.2M, inside the same S-Corporation. The building was being depreciated over 39 years (non-residential commercial property), producing only $26,900 per year in depreciation. The combined practice income and building ownership within a single entity created significant asset protection risk: a malpractice claim against the practice could reach the building because both were owned by the same entity.

The prior CPA had never recommended separating the building from the practice or performing a cost segregation study. The client was paying approximately $180,000 per year in combined federal and state income tax on the S-Corp pass-through income after officer compensation. With proper planning, a significant portion of this tax could have been eliminated or deferred through accelerated depreciation on the building and strategic entity restructuring.

AE Tax Strategy

1. Entity Separation: Real Estate LLC Formation

We transferred the building from the S-Corporation into a newly formed single-member LLC (disregarded entity owned by the dentist personally). The transfer was structured to avoid gain recognition using a combination of the IRC §311(b) distribution rules and the stepped-up basis principles. The LLC then entered into a triple-net lease with the dental practice S-Corp at fair market rent of $96,000 per year ($8,000/month), supported by a commercial real estate appraisal and comparable lease analysis. This created asset protection: the building was now shielded from practice-related malpractice claims.

2. Cost Segregation Study Under IRC §168

We commissioned a cost segregation study on the $1.2M dental office building, identifying $468,000 (39% of depreciable basis after land allocation) in components eligible for reclassification: $195,000 in 5-year property (dental cabinetry, specialty plumbing for dental units, decorative finishes, IT infrastructure, security systems), $118,000 in 7-year property (office furniture, lab equipment mounting, specialty lighting for operatories), and $155,000 in 15-year property (parking lot, landscaping, exterior signage, sidewalks, site drainage). Under 100% bonus depreciation, the entire $468,000 was deductible in Year 1.

3. Self-Rental Income and Loss Coordination

Because the building LLC was a disregarded entity owned by the dentist who materially participated in the dental practice, the rental income from the self-rental arrangement was recharacterized as non-passive under Treas. Reg. §1.469-2(f)(6). The $468,000 in bonus depreciation far exceeded the $96,000 in rental income, creating a $372,000 net loss on the building. Because the self-rental losses were treated as non-passive (matching the non-passive rental income), the net loss offset the practice S-Corp income. The Year 1 tax savings on the $156,000 in net incremental deductions (after accounting for the depreciation that would have been taken anyway) produced approximately $60,000 in tax reduction at the combined 35% federal plus 9.85% Minnesota marginal rate.

Before & After Comparison

Tax Category	Before	After	Savings
Standard Depreciation (39-Year)	$26,900	$0	$26,900
Cost Seg Bonus Depreciation	$0	$468,000	$468,000
Net Year 1 Deduction Increase	$0	$156,000	$156,000
Tax Savings at 44.85%	$12,100	$72,100	$60,000
Total	$26,900	$468,000	$156,000 (Year 1 deduction)

Key Takeaways

• Practice owners who own their building should always separate the real estate from the practice entity for asset protection — malpractice claims against the practice cannot reach assets held in a separate LLC.
• Dental offices produce high cost segregation reclassification percentages (35-42%) due to specialized plumbing, cabinetry, IT infrastructure, and operatory-specific components.
• The self-rental recharacterization rule under Treas. Reg. §1.469-2(f)(6) can work in the taxpayer's favor when cost segregation produces losses that exceed the self-rental income.
• Fair market rent on self-rental arrangements must be documented with comparable lease data and/or a commercial appraisal to withstand IRS scrutiny.