Section 179 allows medical practices to write off qualifying equipment in the year it is placed in service rather than over several years. Here is what that means for your tax bill.
When a dental practice purchases a CBCT scanner for $150,000, the standard tax treatment spreads that cost across several years through depreciation. Section 179 allows the practice to deduct the entire $150,000 in the year the equipment is placed in service instead. At a 32% effective tax rate, that is $48,000 in tax savings in year one rather than a fraction of that spread across five or seven years.
For medical professionals and dentists who invest regularly in equipment, the Section 179 deduction is one of the most straightforward and significant tax planning tools available.
Here is how it works.
What Section 179 actually does
Section 179 of the Internal Revenue Code allows a business to elect to deduct the full cost of qualifying depreciable property in the year it is placed in service, rather than recovering that cost gradually through standard depreciation over the asset’s useful life.
The practical benefit for a medical or dental practice is a meaningful first-year deduction that reduces current-year tax liability and improves cash flow. Instead of waiting years to recover the cost of a major equipment purchase through annual depreciation deductions, the practice can write off the full amount immediately, subject to the applicable limits.
The current limits are generous for most practices. For 2025, the maximum Section 179 deduction is $2,500,000, with the phase-out beginning when total qualifying purchases exceed $4,000,000. For 2026, the maximum rises to $2,560,000, with the phase-out beginning at $4,090,000. For the vast majority of medical and dental practices, these thresholds are well above typical annual equipment spending.
What qualifies in a medical or dental practice
The range of assets that qualify for the Section 179 deduction is broad and covers most of what a medical or dental practice purchases in the normal course of operations.
Dental and medical equipment that typically qualifies includes dental chairs, X-ray machines, CBCT scanners, digital imaging systems, MRI machines, ultrasound equipment, ECG machines, surgical instruments, exam tables, sterilization equipment, autoclaves, medical lasers, and aesthetic equipment. Practice management software and qualifying computer systems also qualify. Office furniture and fixtures used in the practice generally qualify as well.
Business vehicles used in the practice may qualify, but they are subject to special listed property rules and annual vehicle depreciation limits that apply separately from the general Section 179 cap.
What does not qualify: land, buildings, inventory, property not used more than 50% for business purposes, and any asset that has not been placed in service by December 31 of the tax year in which the deduction is being claimed.
Real estate and clinic build-outs: a common source of confusion
One of the most frequent misconceptions is that Section 179 covers the full cost of building out or renovating a clinic. It does not.
The building shell, structural components, and the building purchase itself generally do not qualify under Section 179. Qualified Improvement Property, which covers certain interior improvements to nonresidential buildings, may be eligible for accelerated tax treatment, but the rules for QIP differ between Section 179 and bonus depreciation and should not be assumed to be the same.
For a dentist or physician planning a significant renovation, the practical approach is to separate the equipment and qualifying interior improvements from the structural and building costs, and to coordinate Section 179, bonus depreciation, and standard MACRS depreciation across the different asset categories. Assuming that everything in a build-out qualifies for immediate expensing is one of the more costly planning mistakes in this area.
What the numbers look like
Example 1: Standard dental equipment purchase
A dental practice purchases a CBCT scanner for $150,000 and a digital X-ray system for $80,000 in 2026, for a total of $230,000 in qualifying equipment. Assuming the practice has sufficient taxable income and has not approached the phase-out threshold, the full $230,000 is deductible under Section 179 in 2026. At a 32% effective federal tax rate, the estimated tax saving is $73,600. The net after-tax cost of $230,000 worth of equipment is $156,400.
Example 2: Larger equipment investment
A medical practice purchases $500,000 of qualifying equipment in 2026. Section 179 can cover the full $500,000 if taxable income is sufficient and the overall limits are not exceeded. If any amount cannot be covered by Section 179, 100% bonus depreciation may apply to the remaining eligible basis for property acquired and placed in service after January 19, 2025 under the One Big Beautiful Bill Act. The total first-year deduction could be up to $500,000.
Example 3: Very large equipment year
A dental group purchases $2,000,000 of equipment in 2026. Total purchases of $2,000,000 do not by themselves trigger the phase-out, since the threshold is $4,090,000 in 2026. The full Section 179 deduction remains available up to the $2,560,000 cap, subject to the taxable income limitation.
Section 179 vs bonus depreciation: which one to use
Section 179 and bonus depreciation are both tools for accelerating equipment deductions, but they work differently and can be used together.
Section 179 is elective and subject to the annual cap, the phase-out threshold, and the taxable income limitation. Bonus depreciation is automatic unless elected out, applies after Section 179 to any remaining eligible basis, and under current law is available at 100% for qualifying property acquired and placed in service after January 19, 2025.
The two can be combined. A practice takes Section 179 first on qualifying assets, and bonus depreciation then applies to any remaining eligible basis. Section 179 is generally the better choice when taxable income is sufficient and the goal is targeted expensing of specific assets. Bonus depreciation is particularly useful for large remaining balances or when equipment purchases exceed the Section 179 cap.
The taxable income limitation
Section 179 cannot create or increase a net loss. The deduction is limited to the taxable income generated from the active conduct of the business in that year. Any Section 179 deduction that cannot be used in the current year due to insufficient taxable income carries forward to future years.
For an established practice with strong income, this limitation rarely comes into play. For a new practice in its first year of operation, it can delay part of the deduction even when the equipment fully qualifies. The practical framing is that a new practice can purchase the equipment now and claim the deduction as income grows to support it.
How entity structure affects the deduction
The Section 179 election is made at the entity level but the deduction flows through differently depending on structure.
For a sole proprietor, the deduction flows directly to the owner’s individual return. For an S-Corp, the election is made by the corporation and the deduction flows through to each shareholder’s individual return in proportion to their ownership. For a partnership or multi-member LLC, the election is made at the partnership level and flows through to each partner. The entity structure determines where the deduction appears on the return, not whether the underlying assets qualify.
Timing matters: the placed in service requirement
To claim the Section 179 deduction in a given tax year, the equipment must be placed in service by December 31 of that year. Placed in service means the asset is ready and available for its intended business use, not merely ordered or paid for. Equipment that is ordered in December but not delivered and installed until January qualifies in the following year, not the current one.
Documentation to maintain for each qualifying asset: purchase invoice, delivery date, installation date, asset description, and evidence that the item was available for use by year end. This documentation is essential if the deduction is ever questioned.
Recapture: what happens when you sell equipment
If equipment that was fully expensed under Section 179 is sold or converted to personal use before the end of its normal recovery period, recapture rules apply. The previously deducted amount is recaptured as ordinary income in the year of the sale or conversion. This is worth factoring in when planning a practice transition or sale, since the tax consequences of recapture can be significant on expensive equipment that was fully written off in year one.
Common mistakes worth avoiding
- Assuming all clinic renovation costs qualify under Section 179 is the most common and most expensive planning error in this area.
- Not accounting for the taxable income limitation when projecting the deduction, claiming the deduction on equipment ordered but not yet delivered by December 31
- Failing to coordinate Section 179 with bonus depreciation to maximize first-year deductions are also frequent oversights.
- Missing the year-end deadline by ordering equipment too late in the year is an avoidable mistake that pushes the deduction into the following year.
Frequently asked questions
Does all medical equipment qualify for the Section 179 deduction?
Most tangible depreciable equipment used more than 50% in the business qualifies. Common qualifying items include diagnostic equipment, surgical instruments, dental chairs, imaging systems, and practice management software. Land, buildings, inventory, and assets not placed in service by December 31 do not qualify.
Can I deduct the cost of my clinic renovation under Section 179?
Partially, in some cases. Certain interior improvements to nonresidential buildings may qualify as Qualified Improvement Property and be eligible for accelerated treatment, but the building shell, structural components, and the building itself generally do not qualify under Section 179. A tax advisor can help identify which components of a renovation qualify.
What if my practice does not have enough income to use the full Section 179 deduction this year?
The unused portion carries forward to future tax years. Section 179 cannot create a loss, so if taxable income is insufficient to absorb the full deduction, the remainder is available in subsequent years when income is higher.
Can I use both Section 179 and bonus depreciation on the same equipment purchase?
Yes. Section 179 is applied first, and bonus depreciation can then be applied to any remaining eligible basis. For property acquired and placed in service after January 19, 2025, bonus depreciation is currently 100% under the One Big Beautiful Bill Act.
What happens to my Section 179 deduction if I sell my practice?
If equipment that was expensed under Section 179 is sold before the end of its normal recovery period, the deduction is subject to recapture as ordinary income. This is an important consideration in practice sale and transition planning.
Does the equipment need to be new to qualify for Section 179?
No. Section 179 applies to both new and used qualifying property, provided it is new to the taxpayer and meets the other qualification requirements.
Sources: IRS Publication 946 (How to Depreciate Property); IRS Form 4562 instructions; IRC Section 179; CCH AnswerConnect, Section 179 Deduction; One Big Beautiful Bill Act (bonus depreciation provisions).
Last updated: July 2026
Section 179 is one of the most accessible and impactful tax planning tools available to medical and dental practice owners, but the details matter: the placed in service deadline, the taxable income limitation, and the interaction with bonus depreciation all affect how much you can actually deduct and when. Every situation is different, and the right approach depends on your practice structure, income level, and equipment plans. This article is intended as a general guide and should not be relied upon as tax advice for your specific circumstances. If you want to understand how Section 179 applies to your practice before the year-end deadline, MyTaxFiler can help you work through the numbers.
Talk to us at MyTaxFiler.com