Why Is My Physician Practice Tax Bill So High?

The most common cause of an inflated physician practice tax bill is an S-corp salary set wrong — too high, and you’re paying full payroll taxes with no distribution benefit; too low, like a stale $50,000 salary on $400,000 in net income, and it’s an audit flag sitting below every MGMA benchmark. But that’s just one of five predictable gaps. You paid your CPA, filed your return, and the number was worse than you expected. Maybe significantly worse. If your first instinct was “something is wrong,” you are probably right — but the problem is rarely the current year’s return. It is a structure that has been quietly wrong for years.

Physician practice owners overpay taxes in predictable ways. After reviewing hundreds of healthcare practice returns, the same five gaps show up repeatedly. Here they are, with the dollar value of each at a $400,000 net income practice.

1. Why Is Your S-Corp Salary Set Wrong?

If your practice is an S-corporation, the split between your W-2 salary and your distributions determines how much of your income gets hit with payroll taxes. Salary is subject to Social Security and Medicare taxes. Distributions are not.

The two ways this goes wrong:

Salary too high: Your CPA set your salary at 100% of net income “to be safe” — meaning you are paying full payroll taxes on every dollar the practice earns, and taking zero advantage of the S-corp structure. This is extremely common in practices where the entity was set up correctly but never actively managed.

Salary too low: Your salary is $50,000 regardless of what your practice nets — because that was the number from five years ago and nobody revisited it. At $400,000 in net income, a $50,000 salary is below every MGMA specialty benchmark and is an audit flag.

The IRS requires a “reasonable compensation” salary before any distributions are taken. The standard is set by MGMA survey data for your specialty. Setting salary correctly — high enough to satisfy IRS scrutiny, low enough to preserve the distribution benefit — requires active management every year as practice income changes. The full framework for calculating the right number is covered in how much to pay yourself as a physician S-corp owner.

Rough dollar impact at $400K net: If your salary is $100,000 higher than it should be, you are paying approximately $2,900 in unnecessary Medicare taxes on that excess — plus the income tax impact of missing the employer payroll tax deduction optimization. Over five years, that compounds.

If this conversation has never happened with your CPA, it is worth having now.

2. Are You Missing a Retirement Account — or Using the Wrong One?

This is the single largest missed deduction for physician practice owners. The full comparison of retirement account options for physician practices goes deeper, but here is the summary of what is being left unclaimed., and the one that produces the most immediate, measurable tax savings.

A physician practice owner who makes no retirement contribution is leaving a substantial deduction unclaimed. Here is what the right structure looks like in 2026:

Solo 401(k) — for single-physician practices with no W-2 employees:

• Employee elective deferral: up to $24,500 ($32,500 if age 50+)
• Employer profit-sharing contribution: up to 25% of W-2 salary
• Combined maximum: $72,000 ($80,000 if 50+)

SEP-IRA:

• Contribution limit: 25% of W-2 salary, up to $72,000
• Simpler to administer than a Solo 401(k), but less flexible — you cannot make the additional employee elective deferral

Defined Benefit / Cash Balance Plan — the underpublished option for physicians over 45:

• Annual contribution: $150,000–$275,000 or more, depending on age and actuarial assumptions
• Stacks on top of a 401(k) in a combination plan
• At a 37% marginal rate, $200,000 in defined benefit contributions produces $74,000 in avoided federal income tax — in a single year

Dollar impact at $400K net, physician age 50:

• No retirement contribution: $0 deduction
• Solo 401(k) maxed: $32,500 employee + ~$55,000 employer (25% of $220K salary) = $87,500 deduction → $32,375 in avoided federal tax
• Add a cash balance plan: additional $150,000+ contribution → another $55,500+ in avoided federal tax
• Total potential: $87,000+ in avoided federal tax this year

If you are over 45 and not running a defined benefit plan, this is very likely the largest single available tax reduction in your practice — and the one most CPAs are not proactively recommending.

3. Why Are You Missing the Health Insurance Deduction?

S-corp owner-employees have a specific rule that trips up a large number of physician practices: health insurance premiums paid by the S-corp for a greater-than-2% shareholder must be included in the shareholder’s W-2 wages — but then the shareholder can deduct those premiums above the line on their personal return.

If this is handled incorrectly (premiums not included in W-2, or included but the personal deduction never claimed), you either:

• Lose the deduction entirely, or
• Pay income tax on health insurance premiums that should be tax-free

Dollar impact: A physician practice owner paying $24,000/year in health insurance premiums who misses this deduction owes approximately $8,880 more in federal income tax at a 37% marginal rate — every single year. This is not a one-time error; it compounds annually until it is corrected.

The fix requires coordination between whoever runs your payroll and whoever prepares your return. If those are two different vendors who do not communicate, this gap is likely present.

4. Why Aren’t Your Vehicle Deductions Captured Correctly?

The Section 179 vehicle deduction is one of the most discussed tax topics in physician communities online — and one of the most frequently misclaimed.

The legitimate deduction: a vehicle over 6,000 pounds GVWR purchased or leased by the business can be expensed immediately under Section 179 and/or bonus depreciation. In 2026, bonus depreciation is 100% — OBBBA made this permanent for property placed in service after January 19, 2025. A qualifying SUV purchased for $80,000 produces an $80,000 first-year deduction, worth approximately $29,600 in avoided tax at a 37% marginal rate.

Where it goes wrong:

• Vehicle titled personally, not in the S-corp: The deduction is limited or lost. The S-corp must own or lease the vehicle to claim the business expense.
• Business use below 50%: Section 179 requires the vehicle to be used more than 50% for business. No log = no deduction on audit.
• Luxury vehicle cap applies to vehicles under 6,000 lbs: Standard cars have a first-year depreciation cap of $12,400 (2024), not the full purchase price. Many physicians claim the full deduction on a car that does not qualify.
• Personal use reported incorrectly: If the S-corp owns the vehicle and you also use it personally, the personal use percentage is a taxable fringe benefit. If this is not being tracked and reported, you have both a missed deduction and an underreported income issue.

The vehicle deduction is real and valuable. But it requires the vehicle to be in the right entity, the mileage log to exist, and the personal use calculation to be clean.

5. Why Was Your QBI Deduction Missed or Miscalculated?

Section 199A allows certain pass-through business owners to deduct up to 20% of qualified business income. For physicians, this deduction is income-limited — medicine is a Specified Service Trade or Business (SSTB), so the deduction phases out as taxable income increases.

The phase-out for 2026:

• Below $201,750 (single) / $403,500 (MFJ): full 20% QBI deduction available
• $201,750–$276,750 (single) / $403,500–$553,500 (MFJ): partial deduction
• Above $276,750 (single) / $553,500 (MFJ): deduction phased out

Here is what most physicians are not told: the phase-out is based on taxable income after deductions — not gross income. This means retirement account contributions that reduce taxable income can move a physician back into QBI deduction territory.

Example: Physician, single, $300,000 in practice net income. After salary and standard deduction, taxable income sits at $240,000 — within the $201,750–$276,750 phase-out range, roughly 51% phased out.

Now add a $72,000 Solo 401(k) contribution: taxable income drops to $168,000 — below the phase-out floor. The QBI deduction is now 20% × $168,000 = $33,600, worth $12,432 in avoided federal tax. The retirement contribution did double work.

If your return shows zero QBI deduction and your practice income is below $500,000, it is worth asking why.

The Pattern Behind All Five

One gap not covered above: if your practice should have elected S-corp status and did not, the IRS has a formal late election relief procedure that can recover two or three years of overpaid self-employment taxes retroactively. Worth checking if your election status is uncertain.

None of these gaps are obscure tax strategies. They are all standard elements of a well-structured physician practice tax return. They appear on underperforming returns for the same reason: the CPA prepared the return based on the information provided rather than proactively reviewing the structure and surfacing optimization opportunities.

A compliance-oriented CPA files what you give them accurately and on time. An advisory-oriented practice asks, before filing: what is the optimal salary, are retirement contributions maxed, is the vehicle deduction clean, is the QBI phase-out range in play?

If you cannot recall having those conversations with your current CPA in the past 12 months, you are likely in a compliance engagement — not an advisory one. The difference, for a physician practice at $400,000 in net income, can easily be $30,000–$60,000 per year in aggregate across these five gaps.

That is the size of the problem worth solving.