Cost Segregation for Dental Offices
Dental offices reclassify 24% to 35% of basis. Operatory plumbing and electrical, vacuum and compressed air, casework, and imaging power drive the result.
Cost segregation for a dental office reallocates the property's cost from the 39-year nonresidential schedule into shorter MACRS classes. Dental practices reclassify 24% to 35% of depreciable basis because each operatory requires dedicated plumbing, vacuum, compressed air, and electrical serving the chair and delivery unit, and because casework runs throughout the build-out.
Why Dental Offices Reclassify the Way They Do
Every operatory is a small equipment installation. The chair, delivery unit, light, and monitor each require dedicated electrical, and the operatory needs water, drain, vacuum, and compressed air lines.
Central vacuum and compressed air systems, including pumps, receivers, and distribution piping, are process equipment serving the operatories rather than building plumbing.
Imaging, whether panoramic, cephalometric, or cone beam, requires dedicated power and often lead shielding, both of which warrant separate treatment.
Sterilization areas need specialty plumbing, dedicated electrical, and extensive casework.
Casework and millwork throughout operatories, sterilization, lab, and reception is substantial and generally 5-year property.
Component Breakdown
- 5-year property: operatory casework and delivery unit connections, central vacuum and compressed air systems and distribution, dedicated electrical to chairs and imaging, sterilization casework and specialty plumbing, nitrous oxide distribution, decorative and task lighting, reception and waiting furnishings, audiovisual and practice management systems, and security and access control.
- 7-year property: office furniture and fixtures without an assigned class life.
- 15-year property: parking and drive lanes, sidewalks and curbing, site lighting, landscaping and irrigation, drainage, fencing, and exterior signage.
- 39-year property: structural frame, foundation, roof, exterior envelope, and base building mechanical, electrical, plumbing, and fire protection.
Illustrative Returns
| Property | Price | Depreciable basis | Reclassified | Year 1 deduction |
|---|---|---|---|---|
| 4-operatory practice | $1,150,000 | $950,000 | 29% / $276,000 | ~$285,000 |
| 8-operatory practice with imaging | $2,400,000 | $1,950,000 | 32% / $624,000 | ~$641,000 |
| Multi-site DSO location | $3,100,000 | $2,500,000 | 30% / $750,000 | ~$772,000 |
| Oral surgery suite | $3,800,000 | $3,050,000 | 34% / $1,037,000 | ~$1,063,000 |
Leasehold Build-Outs Versus Owned Buildings
Many dental practices lease. Where the practice pays for and owns the build-out, the improvements are the practice's asset to depreciate.
Interior improvements to nonresidential property placed in service after the building was first placed in service generally qualify as qualified improvement property with a 15-year recovery period, which is bonus-eligible at 100%. Combined with 5-year equipment and specialty systems, a pure leasehold build-out with no structural work can be close to fully deductible in year one.
Read the lease before the study. Where the landlord funds and owns the improvements, the landlord depreciates them and the tenant may have income or a basis adjustment depending on how the tenant improvement allowance is written.
If the practice relocates or closes before the improvements are fully depreciated, the remaining basis is generally deductible on abandonment. That is a commonly missed deduction.
Coordinating With the Practice Entity
Most dental practices operate as S corporations, which makes the depreciation decision interact with reasonable compensation and Section 199A.
Dentistry is a specified service trade or business, so above the taxable income thresholds the qualified business income deduction phases out entirely regardless of W-2 wages. That changes the calculus: for an owner already above the phase-out, a large depreciation deduction does not cost a QBI deduction they were not going to get.
Below the thresholds, the interaction matters and should be modeled before the depreciation elections are finalized.
How a Cost Segregation Engagement Actually Runs
Six steps, in this order. The first one matters most and is the one most providers skip, because it is the step that can conclude you should not buy a study at all.
- Confirm the deduction is usable before spending anything. This comes first because it decides whether the rest is worth doing. We model material participation, outside basis, the at-risk rules of Section 465, and the excess business loss limitation of Section 461(l). If the loss would be suspended under Section 469, we say so before you pay for a study rather than after.
- Establish the depreciable basis and the land allocation. Purchase price is not depreciable basis. Land is stripped out first, and the allocation needs support, normally an appraisal separating land from improvements. A ten-point swing in the land allocation moves the first-year deduction by tens or hundreds of thousands of dollars, so this step gets as much attention as the component analysis.
- Perform the engineering analysis. An engineer reviews construction documents where they exist, inspects the property, and prices components using recognized cost estimating data. Each component is assigned to its correct MACRS class with a documented basis for the assignment. This is the detailed engineering approach the IRS Cost Segregation Audit Techniques Guide treats as most reliable.
- Identify partial dispositions and repair opportunities. On a property that has been improved or renovated, components that were replaced are often still sitting on the depreciation schedule alongside their replacements. A partial disposition election writes off the remaining basis. At the same time, spending that qualified as a repair under Reg. 1.263(a)-3 rather than a capital improvement gets identified.
- File correctly, including the Form 3115 if the property is not new to you. For a property acquired this year, the study simply informs the depreciation schedule. For a property held longer, the catch-up runs through a change in accounting method: Form 3115, a Section 481(a) adjustment deducted in full in the year of change, the original attached to the return, and a duplicate copy filed separately with the IRS in Ogden.
- Model the exit before you claim the deduction. Accelerated depreciation on personal property is recaptured as ordinary income under Section 1245 on sale. Deducting at 35% and recapturing at 37% is a bad trade. We model the full holding period, including whether a 1031 exchange or the basis step-up at death converts the timing benefit into a permanent one.
Key Takeaways
- Dental Offices typically reclassify 24% to 35% of depreciable basis.
- Land allocation drives the result as much as the component study does.
- A property held for years can still be caught up in full through a Form 3115.
- Section 179, not bonus depreciation, is the tool for roofs and HVAC on nonresidential buildings.
- The passive activity analysis decides whether the deduction is usable this year.
Frequently Asked Questions
How much does a dental office cost segregation study reclassify?
Typically 24% to 35% of depreciable basis. The range depends on the property's age, construction, and how much of the investment sits in equipment and site work rather than building structure.
Is a cost segregation study worth it on a dental office?
Generally yes once depreciable basis exceeds roughly $500,000, provided you can use the deduction in the current year. The binding question is not the size of the deduction but whether the passive activity rules, basis limits, and excess business loss limitation allow you to claim it now.
Can I do a study on a property I bought years ago?
Yes. A Form 3115 change in accounting method captures every missed deduction from the placed-in-service year in a single Section 481(a) adjustment claimed in the current year. No amended returns are needed and there is no three-year limitation.
What happens to the accelerated depreciation when I sell?
Personal property is recaptured as ordinary income under Section 1245 to the extent of gain, and building and land improvement depreciation is subject to unrecaptured Section 1250 gain at up to 25%. A 1031 exchange defers it, and holding until death eliminates it through the basis step-up under Section 1014.
Will the deduction offset my other income?
It depends on the passive activity rules. For an owner-operated business the loss is generally non-passive where you materially participate. For a property held in a separate entity and leased to your operating company, the self-rental rules apply and a grouping election under Reg. 1.469-4 is often needed.
Related Reading
Talk Through Your Situation
Every situation turns on its own facts. Schedule a discovery call and we will walk through what applies to you, what it is worth, and what it would take to put it in place.