Cost Segregation for Medical Office Buildings

An owner-doctor who purchased a medical office building for $2 million and depreciated the whole cost over 39 years is quietly overpaying federal tax every year the building sits on the books. A cost segregation study reclassifies part of that building into shorter recovery periods, and, in combination with 100 percent bonus depreciation restored under the One Big Beautiful Bill Act, can move a large first-year deduction into the year of purchase or the year the study is completed.

Cost segregation medical office analyses are one of the highest-leverage tax moves available to physicians who own the real estate under their practice. The study is a professional engagement, not a self-help form, and it is not the right answer for every owner. But when it works, the year-one tax impact typically dwarfs the study cost by an order of magnitude.

What Cost Segregation Actually Does

A commercial building is depreciated under MACRS as 39-year nonresidential real property. That means each year the owner deducts one thirty-ninth of the depreciable cost, which produces a slow trickle of tax benefit spread across four decades.

A cost segregation study is an engineering-based analysis that identifies components of the building that qualify for shorter recovery periods under existing tax law. Certain non-structural building components, land improvements, and personal property tied to the building can be reclassified out of 39-year property and into 5, 7, or 15-year property. Those shorter-life buckets then depreciate on a much steeper curve and, in most cases, qualify for bonus depreciation in the year they are placed in service.

The study does not create new deductions. It moves deductions forward in time. Present-value math almost always favors the acceleration.

What Reclassifies Inside a Medical Office Building

Medical and dental office buildings tend to yield strong reclassification results because clinical space contains more specialty electrical, plumbing, HVAC, and finishes than a generic office. Common reclassifications include:

• Dedicated medical gas and vacuum lines and their supporting equipment.
• Specialty electrical for imaging and lab equipment, including dedicated circuits and isolation transformers.
• Cabinetry and millwork specific to operatories, procedure rooms, or lab spaces.
• Removable flooring, wall coverings, and specialty finishes in clinical areas.
• Site improvements such as parking lots, curbing, landscaping, exterior lighting, and signage, which typically qualify as 15-year property.
• Certain plumbing serving specific equipment rather than the building at large.

The exact split depends on the building. A newly built dental office with heavy operatory build-out often sees a higher percentage of cost segregated into shorter-life buckets than a converted general office space.

The Bonus Depreciation Multiplier Effect

The reclassification is only half the tax story. The second half is what happens to the shorter-life property in year one.

Under the OBBBA, 100 percent bonus depreciation was restored permanently for qualifying property placed in service on or after January 19, 2025. Most 5, 7, and 15-year property carved out of a cost segregation study qualifies. That means the reclassified portion can be fully deducted in the year the study is completed and applied, rather than spread over the shorter recovery period.

For an owner-doctor who purchased a building in early 2025 and completes a cost segregation study before filing, a significant portion of the reclassified cost can hit the current-year return as immediate deduction. For a building purchased in a prior year, a look-back study can catch up on the deductions that should have been taken, without amending returns.

Look-Back Studies: Catching Up on Prior Years

The Section 481(a) adjustment is one of the most useful and least-known parts of cost segregation. A study performed on a building that has been in service for one or more prior years can generate a catch-up deduction equal to the difference between the depreciation actually taken and the depreciation that would have been taken if the building had been classified correctly from the beginning. The adjustment lands on the current-year return in the year the accounting method change is filed. No amended returns are required.

This turns a study on a building the practice has owned for five, ten, or fifteen years into a substantial current-year deduction, which is often the single largest tax event in that practice’s history.

When a Study Is Worth It (and When It Is Not)

Cost segregation is worth serious consideration when the building cost basis is above roughly $500,000, the owner has current or projected taxable income to absorb the deduction, and the owner expects to hold the property for at least several more years. A study on a building slated for near-term sale can trigger unfavorable depreciation recapture and needs careful modeling.

It is generally not worth the fee when the building basis is low, when passive activity rules prevent the owner from using the deduction, or when the owner is a nonprofit or otherwise not paying federal income tax.

Cooper Norman advises physician and dental practice owners in Idaho Falls, Boise, Provo, Salt Lake City, and across the Idaho and Utah footprint on tax planning for practice-owned real estate. If you own the building your practice occupies and have not looked at cost segregation, the conversation is worth having before you close another tax year.

This overview is general information, not tax advice for your specific situation.