Tax savings for allergists: practice owner edition

May 6, 2026 · Pouyan Golshani, MD, Interventional Radiologist

If you own an allergy practice, your tax structure looks more like a business owner than a clinician. Here’s the playbook. This shift in mindset is critical. While your clinical focus is on mast cells and eosinophils, your financial success hinges on understanding depreciation, entity structure, and the tax code. The good news is that as a practice owner, you have access to a suite of powerful tax-saving tools unavailable to your W-2 colleagues. For allergists, whose practice income often sits in a unique spot compared to other specialties, mastering these strategies can translate into tens or even hundreds of thousands of dollars in annual savings. This article breaks down the high-yield strategies specific to your position. For a broader look at the specialty, you can find more allergy and immunology resources on our hub.

Protecting Your 20% QBI Deduction Under Section 199A

The Tax Cuts and Jobs Act of 2017 (TCJA) introduced one of the most significant tax breaks for business owners in decades: the Section 199A Qualified Business Income (QBI) deduction. In short, it allows owners of pass-through businesses (like S-Corps or LLCs, common for medical practices) to deduct up to 20% of their business income from their personal tax return. For a practice with $400,000 in net income, this could mean an $80,000 deduction, saving over $25,000 in federal taxes.

There’s a major catch for physicians. Medicine is classified as a “Specified Service Trade or Business” (SSTB). This means the QBI deduction is subject to a strict income phase-out. For 2026, this phase-out begins at a taxable income of approximately $394,000 for single filers and $787,000 for those married filing jointly (MFJ). Once your income exceeds the top of the phase-out range, the deduction disappears entirely.

Here’s the allergist’s strategic advantage: unlike many surgical or procedural subspecialists whose incomes soar far past these limits, many allergy practice owners can realistically manage their income to stay under the threshold and claim the full deduction. This isn’t about earning less; it’s about strategically reducing your final taxable income.

The Playbook for Staying Under the Threshold:

Maximize Retirement Contributions: This is your most powerful lever. Fully fund your practice’s 401(k) to the maximum employee and employer limits. If your spouse works, ensure their plan is maxed out as well. These contributions directly reduce your adjusted gross income (AGI).
Utilize a Cash Balance Plan: Think of this as a supercharged, defined-benefit pension plan you can layer on top of a 401(k). Depending on your age and income, you can contribute and deduct an additional $100,000, $200,000, or even more per year, dramatically lowering your taxable income.
Fund Your Health Savings Account (HSA): If you have a high-deductible health plan, max out your family HSA contribution ($8,750 for 2026). It’s a small but easy reduction.
Strategic Charitable Giving: Instead of donating cash each year, “bunch” several years’ worth of donations into a single year via a Donor-Advised Fund (DAF). This allows you to take a large itemized deduction in one year, potentially pushing your income below the 199A threshold, while still distributing the funds to charities over time.

The Trap to Avoid: Setting your own W-2 salary from your S-Corp too high. While you must pay yourself a “reasonable salary,” anything above that reasonable amount could be taken as a distribution. An excessively high salary increases your AGI unnecessarily and is subject to payroll taxes, while distributions are not. Fine-tuning this balance is a conversation for a physician-focused CPA who understands the nuances of medical practice finance.

Cost Segregation and Real Estate Professional Status (REPS)

If you own the building your practice operates in, or any other investment real estate, you are sitting on a massive, often untapped, tax-deferral engine. By default, commercial real estate is depreciated over a 39-year straight-line schedule. A $2 million building yields a depreciation deduction of about $51,000 per year. It’s helpful, but we can do much better.

A cost segregation study is an engineering-based analysis that breaks down a property into its component parts and reclassifies them into shorter depreciation schedules. Instead of treating the entire building as 39-year property, it identifies elements that qualify for 5, 7, or 15-year depreciation. For example:

5-Year Property: Carpeting, specialty electrical wiring, cabinetry, decorative fixtures.
7-Year Property: Office furniture.
15-Year Property: Land improvements like parking lots, sidewalks, and landscaping.

A typical study might reclassify 20-30% of a building’s cost basis into these shorter-lived categories. Thanks to 100% bonus depreciation (which is phasing down, but still substantial), you can often deduct the entire cost of these reclassified assets in the first year. On that $2 million building, a cost segregation study could easily generate a year-one depreciation deduction of $400,000 or more, instead of the standard $51,000.

Supercharging the Deduction with REPS:

By default, rental real estate losses are considered “passive” and can only offset passive income. This is where Real Estate Professional Status (REPS) comes in. If your spouse is not a practicing physician (or works part-time), they may be able to qualify. The IRS requirements are clear and require no special certification:

The spouse must spend more than 750 hours per year on real estate activities.
Those hours must constitute more than 50% of their total working time.

If your spouse qualifies for REPS and you file jointly, your real estate losses—now supercharged by cost segregation—are no longer passive. They become active losses that can be used to offset your active income from the medical practice. That $400,000 “paper loss” from depreciation can directly reduce your taxable medical income, potentially eliminating your entire federal income tax bill for the year. This is a cornerstone of an effective real estate strategy for high-income professionals.

The Trap to Avoid: Sloppy time tracking. To claim REPS, you must maintain a contemporaneous log of hours spent on real estate activities (e.g., communicating with property managers, analyzing deals, overseeing renovations). An IRS audit will ask for these records, and “I worked on it a lot” won’t suffice. Use a spreadsheet or app to track time diligently.

The HSA Triple-Stacking Strategy

The Health Savings Account (HSA) is arguably the most powerful retirement and investment account available, yet it’s often misunderstood and underutilized. For practice owners with a high-deductible health plan (HDHP), it offers a unique triple tax advantage:

Tax-Deductible Contributions: Contributions are made pre-tax, directly reducing your taxable income. For 2026, the family contribution limit is $8,750.
Tax-Free Growth: Unlike a 401(k) or IRA, the money inside your HSA can be invested in stocks and bonds and grows completely tax-free.
Tax-Free Withdrawals: Funds can be withdrawn tax-free at any time to pay for qualified medical expenses.

Most people stop there, using the HSA like a medical checking account. The advanced strategy—the “triple stack”—is to treat it as a stealth retirement account. Here’s how it works:

The Playbook:

Step 1: Max It Out. Contribute the maximum family amount ($8,750 in 2026) every single year without fail.
Step 2: Invest It. As soon as the funds hit the account, invest them in low-cost, broad-market index funds. Do not let the cash sit idle.
Step 3: Don’t Touch It. Pay for all current medical expenses out-of-pocket with post-tax dollars. Do not reimburse yourself from the HSA.
Step 4: Save Every Receipt. Keep a digital folder (e.g., in Google Drive or Dropbox) of every single qualified medical expense you incur from now until retirement—copays, prescriptions, dental work, eyeglasses, everything.

Decades from now, you will have a massive, tax-free investment account. The accumulated receipts from all those years serve as your basis for tax-free withdrawals in retirement. If you’ve saved $200,000 in receipts over 30 years, you can pull $200,000 out of your HSA completely tax-free to use for anything—travel, a new car, living expenses. It effectively becomes a tax-free emergency fund or a Roth IRA with an upfront deduction.

The Trap to Avoid: Losing your receipts. The IRS requires proof that withdrawals correspond to qualified medical expenses. Without the receipts, withdrawals for non-medical purposes after age 65 are treated like traditional IRA withdrawals—subject to ordinary income tax. A simple system of scanning or photographing receipts and saving them to a cloud folder solves this permanently.

Side Hustles and the Solo 401(k)

Even as a practice owner, you may have opportunities for 1099 income streams outside your primary S-Corp. This could include medical directorships, expert witness work, consulting for biotech, or telemedicine shifts for an unrelated company. This side income opens the door to another powerful retirement savings vehicle: the Solo 401(k).

A Solo 401(k) is for self-employed individuals with no employees (other than a spouse). It allows you to contribute as both the “employee” and the “employer.” For 2026, this means you can contribute:

As the employee: 100% of your compensation up to the employee limit ($24,500 in 2026, plus a catch-up if over 50).
As the employer: Up to 20% of your net self-employment income.

The total contributions cannot exceed a combined limit, which is $69,000 for 2026. This is *in addition* to what you can save in your primary practice’s 401(k). If you are already maxing out the employee portion of your main 401(k), you can only make the “employer” contribution to your Solo 401(k), but this still provides significant additional tax-deferred savings space.

For example, if you earn $50,000 in 1099 consulting income, you could contribute roughly 20% of that ($10,000) into a Solo 401(k) as an employer contribution, giving you an immediate $10,000 tax deduction.

The Trap to Avoid: The “pro-rata” rule with backdoor Roth IRAs. Many physicians have existing traditional IRAs from rolling over old 401(k)s. If you have a pre-tax balance in any traditional IRA, it complicates or “poisons” your ability to do a clean backdoor Roth IRA conversion. A Solo 401(k) provides the solution: most plans allow you to roll existing IRA assets *into* the Solo 401(k), clearing out your IRA balance and paving the way for tax-free backdoor Roth contributions.

Rescuing Lost Deductions with a Schedule C

This is a more nuanced strategy that addresses a frustration for physicians who are owner-employees of their own S-Corp. Since the TCJA in 2018, W-2 employees can no longer deduct unreimbursed business expenses. This includes things like home office use, cell phone bills, professional dues, or CME costs that your practice doesn’t reimburse you for.

As an S-Corp owner, the best practice is to have the corporation pay for or reimburse you for all legitimate business expenses. This is the cleanest way to handle it. However, sometimes expenses fall through the cracks. The solution lies in having a separate, legitimate side business that files on a Schedule C (the form for sole proprietorships).

Any 1099 income—even a few thousand dollars from a single speaking gig or consulting project—creates a Schedule C. This form is a business owner’s playground for deductions. The unreimbursed expenses from your W-2 role can often be re-categorized as ordinary and necessary expenses for your Schedule C business. Your professional society dues, medical license fees, and part of your cell phone bill are all necessary for you to operate as an independent consultant.

The Playbook:

Establish a 1099 side gig. This must be a real, for-profit activity.
Track all professional expenses that are not reimbursed by your main practice.
Deduct these expenses on your Schedule C against your 1099 income.

This can effectively make a small amount of side income tax-free, as the deductions can easily offset the revenue. For example, $5,000 in consulting income could be offset by $1,500 in society dues, $800 for a license, $1,200 for a portion of your home office, and $1,500 for a new laptop used for that work. The net income is zero, and you’ve successfully deducted expenses that would have otherwise been lost.

The Trap to Avoid: Claiming a business is for-profit when it consistently loses money and has no real profit motive. The IRS can reclassify a business as a “hobby,” which disallows all expense deductions. Ensure your side gig is legitimate, you are actively trying to make a profit, and you keep clean records separating its finances from your personal accounts.

As a practice owner, your tax return is a complex financial instrument. The strategies above—from managing your AGI for QBI to leveraging real estate and side businesses—are just the beginning. Each requires careful planning and execution. By shifting your perspective from that of a clinician to that of a strategic business owner, you can take control of your financial future and keep more of the income you work so hard to earn.