Cost Segregation for Dental Offices
This guide uses 24% to 35% reclassification as an illustrative assumption, not a verified benchmark. Review the actual assets, evidence and deduction limits before commissioning a study.
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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.
Determine who owns and depreciates each improvement under the lease and applicable tax rules. QIP generally requires an improvement made by the taxpayer to the interior of nonresidential real property after the building was first placed in service. Enlargements, elevators and escalators, and internal structural framework are excluded. Qualifying QIP generally has a 15-year GDS recovery period, but ADS requirements, acquisition and placed-in-service timing, elections and other bonus exclusions must be checked. A funded build-out is not automatically all QIP or immediately deductible.
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 may permit a loss for supported remaining basis when the disposition, eligibility and timely-election requirements are met; a late election is not automatically available through Form 3115. At the same time, spending that qualified as a repair under Reg. 1.263(a)-3 rather than a capital improvement gets identified.
- Determine correction procedure and file correctly. Before filing, determine whether the depreciation issue requires an original return, an amended return or an eligible accounting-method change. Form 3115 is not automatic solely because the property is older. For a qualifying change, a negative Section 481(a) adjustment generally applies in the year of change and a positive adjustment generally over four years, subject to exceptions. Confirm current filing instructions, any required duplicate submission and owner-level deduction limits.
- Model the exit before you claim the deduction. Model the actual holding period, allocation of sale proceeds, adjusted basis and applicable recapture rules. Section 1245 can treat gain as ordinary income up to the relevant depreciation amount; Section 1250 and unrecaptured Section 1250 gain follow different rules. A comparison of two tax rates alone ignores timing, cash flows and transaction costs. Section 1031 applies only to qualifying real property and does not automatically defer every component. Any basis adjustment at death depends on ownership and applicable Section 1014 rules; it is not a guaranteed outcome.
Key Takeaways
- The 24% to 35% range used here is an illustrative modeling assumption, not a verified industry benchmark or a predicted result for your property. Actual classifications require supported costs, asset functions and applicable tax rules.
- 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?
The 24% to 35% range used here is an illustrative modeling assumption, not a verified industry benchmark or a predicted result for your property. Actual classifications require supported costs, asset functions and applicable tax rules.
Is a cost segregation study worth it on a dental office?
A $500,000 depreciable basis is an illustrative property amount, not a universal threshold for a worthwhile study. Compare supported deductions and their usability with study and filing fees, state effects and the expected holding period. Review basis, at-risk, passive-activity and excess-business-loss limits before projecting benefits.
Can I do a study on a property I bought years ago?
A study can review an older property, but the preparer must identify the permitted correction procedure. An eligible Form 3115 change can include cumulative differences in a Section 481(a) adjustment. Negative adjustments generally apply in the year of change and positive adjustments generally over four years, with exceptions and owner-level loss limits. This does not reopen every prior year for refunds.
What happens to the accelerated depreciation when I sell?
Sale treatment depends on asset classification, adjusted basis, depreciation and gain. Section 1245 recapture, Section 1250 recapture and unrecaptured Section 1250 gain have different rules. Section 1031 is limited to qualifying real property, and a basis adjustment at death depends on the applicable ownership and Section 1014 rules. Neither automatically eliminates all tax on every component.
Will the deduction offset my other income?
Review basis, at-risk, passive-activity and excess-business-loss limits. Material participation can matter for an operating business. A related-party rental requires separate analysis: the self-rental rule can recharacterize net income without making a net loss nonpassive. Grouping is available only when its requirements are met; separate ownership alone does not establish a deductible loss.
Related Reading
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Sources for correction procedures and sale treatment
Technical discussion updated November 6, 2026. Review the applicable procedure and your records before filing.