When a dental practice owner buys or builds a facility, the IRS default is to depreciate the entire building over 39 years. That timeline rarely matches when you actually need the deduction. Cost segregation is an engineering-based tax strategy that reclassifies portions of your facility into shorter depreciation categories, pulling deductions forward into the first few years of ownership rather than spreading them across four decades.
For high-income dental practice owners, that front-loading matters. A larger deduction in the years when your income is highest does more tax work than the same deduction spread thin over 39 years. Start with what the study actually does.
What Is Cost Segregation And How Does It Work For Dental Practices?
Cost segregation is an engineering analysis that breaks a commercial property into its component parts and assigns each part a depreciation life that matches its actual use. Instead of treating your entire dental office as a single 39-year asset, a cost segregation study identifies which building components qualify for 5-year, 7-year, or 15-year depreciation, which sharply accelerates the deduction schedule.
The study is performed by a cost segregation specialist (typically an engineer with tax training) who physically inspects the property or reviews construction documents and allocates costs to IRS asset classes under the Modified Accelerated Cost Recovery System (MACRS). The strategy has solid legal footing. The Tax Court upheld component-based depreciation in Hospital Corporation of America v. Commissioner, 109 T.C. 21 (1997), the IRS acquiesced, and the Service now describes what a quality study looks like in its own Cost Segregation Audit Techniques Guide, Publication 5653, which discusses that case directly. The resulting deductions are taken on your federal return exactly like any other depreciation, with no special elections required beyond the study itself. What makes the strategy unusually productive for dentists is what sits inside a dental buildout.
Dental Practices Have More Segregable Assets Than Most Medical Offices
A dental office has a higher proportion of short-life personal property than a typical commercial building, which makes cost segregation particularly productive for dentists. Building components that commonly qualify for 5- or 7-year depreciation include dental cabinetry, plumbing rough-ins dedicated to operatory equipment, specialized electrical for compressors and vacuum systems, in-office HVAC modifications, flooring in treatment areas, and decorative finishes.
One important distinction: your free-standing dental equipment (chairs, imaging, CAD/CAM units, sterilizers) is already 5- or 7-year property and is depreciated or expensed without any study. A cost segregation study is about the building and the buildout. It finds the components buried in the 39-year building basis, like the operatory plumbing and compressor electrical above, so they can be depreciated on equipment-like schedules.
Outdoor improvements like parking lot paving and landscaping typically qualify as 15-year property under MACRS rather than 39-year building components. On a typical dental buildout, somewhere between a fifth and two fifths of the total cost is commonly reclassified out of the 39-year bucket into shorter-life categories, a range often cited by the American Society of Cost Segregation Professionals. Treat that as a planning estimate rather than a promise; the real split depends on the property’s composition. How much of the reclassified amount you can deduct immediately comes down to bonus depreciation.
Bonus Depreciation Works Alongside Cost Segregation To Front-Load Deductions
Cost segregation identifies which assets qualify for accelerated depreciation. Bonus depreciation, under IRC Section 168(k), determines how much of that accelerated amount can be deducted immediately in year one rather than over the shorter asset life.
The rules recently changed in practice owners’ favor. The One Big Beautiful Bill Act, signed July 4, 2025, permanently restored 100% bonus depreciation for qualified property acquired and placed in service after January 19, 2025. In practical terms, the 5-, 7-, and 15-year property identified in a study on a newly acquired or newly built facility can generally be deducted in full in the first year.
Older projects follow the phase-down schedule in effect when the property was placed in service: 80% for 2023, 60% for 2024, and 40% for property acquired before January 20, 2025 and placed in service that year. A practice that placed a facility in service in 2024 and is only now completing a study can still claim that year’s rate through a catch-up filing. For facilities acquired after January 19, 2025, there’s no phase-down clock to race.
One state-level note: a number of states don’t conform to federal bonus depreciation, so the amount you deduct federally may be added back on your state return and depreciated under that state’s own schedule. Conformity varies, so it’s worth confirming how yours treats it. Your federal benefit is unchanged, but the state picture can differ, which is one more reason the federal and state pieces belong in the same plan. None of it matters, though, unless the numbers justify the study in the first place.
When Does Cost Segregation Make Financial Sense For A Dental Practice?
Cost segregation studies make sense when the tax savings outweigh the cost of the study by a meaningful margin. As a general rule, properties valued around half a million dollars and up are where the numbers consistently work. Below that, the study fee can eat into the benefit, though smaller properties still merit a quick feasibility analysis.
The strategy is most valuable for dental practice owners who recently purchased or built a facility (within the last 15 years, since lookback studies are available for older properties), expect to hold the property for several years, and have taxable income substantial enough to absorb larger deductions. It’s most powerful at the top of the rate schedule: for 2026, the 37% rate applies to taxable income above $640,600 for single filers and $768,700 for joint filers, per IRS Revenue Procedure 2025-32. It’s less useful if you anticipate selling the property soon, since depreciation recapture at sale will recover a portion of the accelerated deductions.
If you’re reading this and your facility purchase is already years behind you, that isn’t the end of the conversation.
The IRS Lookback Study Lets You Catch Up On Missed Depreciation From Prior Years
Dental practice owners who purchased or renovated a facility years ago without doing a cost segregation study aren’t out of options. The IRS allows a catch-up mechanism: an automatic accounting method change filed on Form 3115 under Revenue Procedure 2015-13, which permits taxpayers to change their depreciation method and claim all missed accelerated depreciation in a single tax year without amending prior returns.
The catch-up deduction is reported as a Section 481(a) adjustment. It reduces taxable income in the current year by the cumulative depreciation that would have been taken under the shorter asset lives since the original placed-in-service date. For a practice that bought a facility several years ago and never did a study, that catch-up can be substantial, often six figures, taken in one year on the next filed return.
What Does A Cost Segregation Study Cost, And How Long Does It Take?
Study fees vary by property size, complexity, and provider. For a dental office buildout in the mid six figures to low seven figures, fees typically land in the five-figure range. Larger or more complex properties (multi-operatory practices with specialized infrastructure, custom HVAC, or significant site improvements) can run higher. Some providers work on a fixed fee; others charge a percentage of identified tax benefit.
Timeline is generally four to eight weeks from engagement to completed report, assuming access to construction documents or the ability to conduct a site visit. The study report is the document of record if the IRS ever questions your depreciation, which is why hiring a qualified specialist with defensible methodology matters more than finding the lowest bid. Your tax advisor should review the completed study before you file.
Cost Segregation Changes Your Tax Picture For Years, Not Just One Filing
It’s worth understanding that cost segregation doesn’t eliminate tax. It shifts when you pay it. Front-loading depreciation in the first years means less depreciation is available later in the 39-year schedule. For most dental practice owners in peak earning years who plan to eventually exit or slow down, that trade is favorable: larger deductions now, when your income and tax rate are higher, versus smaller deductions later, when your rate may be lower. But it requires deliberate planning rather than a set-it-and-forget-it approach.
This is where having your tax planning and your broader financial picture managed by the same team makes a real difference. The decision to do a cost segregation study doesn’t live in isolation from your retirement contributions, your practice valuation, or your personal investment strategy. An accelerated depreciation event that creates a large deduction this year may interact with your qualified plan contributions, your net investment income calculation, or the year you intend to convert practice equity into personal wealth. These decisions belong in the same conversation.
If you’ve purchased or built dental practice real estate in the last 15 years and haven’t done a cost segregation analysis, the Core Advisors team can walk through whether the numbers work for your specific situation. Our tax planning for dentists is built around your full financial picture, not just the return in front of us. Reach out to book a call and we’ll tell you honestly whether a study is worth it for your property.
This article is for educational purposes only and is not tax, legal, or investment advice. Figures cited are approximate where labeled, reflect federal rules as of the 2026 tax year unless noted, and are subject to change. Consult your tax advisor about your specific situation.
