The Retirement Math Every 1099 Physician Needs to See

How one physician's question about retirement accounts opened the door to a $20,000 annual tax advantage

Not long ago, I got a follow-up message from one of my PEA coaching clients. She's a physician who recently made the leap from practice ownership to 1099 work — two LLCs, a non-compete to navigate, and a financial planner nudging her toward a solo 401(k). She had a specific question: where on the PEA site can she compare a solo 401(k) to a SEP IRA?

It's a great question. And when I looked at her situation, I realized her financial planner was actually steering her in the right direction — but she didn't have the numbers in front of her to see why. So I want to share what I told her, because if you're doing any 1099 work at all, this conversation could save you thousands of dollars every single year.

The Setup: Why This Question Even Comes Up

When physicians move into 1099 income — whether through locums, direct specialty contracting, or building a micro-business — one of the first questions is how to shelter that income from taxes. Two options dominate the conversation: the SEP IRA and the solo 401(k). Most people default to the SEP because it's simpler to set up. Fewer moving parts. No third-party administrator required. And honestly, for a while, that simplicity made sense.

But simplicity has a price tag. And when your 1099 income climbs into the $200,000 to $300,000 range, that price tag gets expensive fast.

The Numbers That Changed the Conversation

Here's what her financial planner spelled out — and I think it's worth reading slowly, because the math is genuinely striking.

In 2026, the defined contribution limit for retirement accounts is $72,000. If you want to hit that number inside a SEP IRA, you need W-2 compensation of $288,000. That's because a SEP is essentially a profit-sharing plan: you can only contribute 25% of your compensation, and nothing more. No salary deferral option. No catch-up provision. Just 25% of pay, capped at the annual limit.

A solo 401(k) works differently. It combines a salary deferral component with a profit-sharing component. In 2026, that breaks down like this:

• Salary deferrals: $24,500

• Profit sharing: $47,500

• Total: $72,000

The key difference? To hit that same $72,000 in a solo 401(k), you only need W-2 compensation of $190,000 — not $288,000. That's a $98,000 difference in required income to reach the same contribution ceiling. And on top of that, the solo 401(k) has catch-up contribution provisions that push the ceiling even higher for physicians who are 50 or older. The SEP has no equivalent.

For this particular physician, with projected 2026 earnings around $250,000, the solo 401(k) wasn't just the better choice — it was the only choice that let her fully max out her retirement contributions. The SEP would have left money sitting on the table. Taxable money.

What About the Setup Costs?

This is the part that makes some physicians hesitate. A solo 401(k) requires a third-party administrator (TPA) — there's no getting around that. In her case, the numbers quoted were a one-time setup fee of $1,200 and ongoing annual administration of about $1,015 per year.

That sounds like a cost. And it is a cost. But run the math against the tax savings you get from sheltering an additional $20,000 or more in pre-tax income, and the TPA fees pay for themselves in the first year. Often in the first quarter.

I always tell physicians to think of these fees the way you'd think of business expenses inside your S-Corp: they're real costs, yes, but they're costs that generate returns. A $1,015 annual administration fee that protects $20,000 from a 30% marginal tax rate is producing roughly $6,000 in tax savings. That's not a cost. That's a 490% return on a business expense.

Her Broader Strategy: A Note on the Full Picture

The retirement account question didn't come out of nowhere. This physician had already done a lot of things right. She had set up a professional LLC for her 1099 income and a separate LLC for her education and branding work. She was working through the S-Corp election decision. She had implemented the Augusta Rule to generate tax-free income from her home. She had a Health Reimbursement Arrangement in the works.

The solo 401(k) wasn't the first piece of her strategy. It was the next piece. And that's exactly how physician micro-business tax planning should work: layer by layer, with each decision building on the last.

The SEP vs. solo 401(k) question is almost always the right question to ask once you've got your entity structure in place and your S-Corp salary set. Don't ask it before that. Ask it after. Because the answer depends entirely on what your W-2 compensation looks like, which depends on how you've structured your pay inside the corporation.

The Part Most Physicians Miss

There's a sequencing issue that trips up a lot of doctors who are new to 1099 income. They get the entity right, they pick a bank account, they start paying themselves — and then they figure out retirement contributions at tax time, when the accountant asks about it. By then, a lot of the flexibility is gone.

The solo 401(k) has to be established before December 31st of the tax year in which you want to make contributions. You can't set it up in April and backdate it to January. The SEP is more forgiving on that deadline — you can open one up to your tax filing date, including extensions. That's a real advantage if you're scrambling.

But if you plan ahead — and you should — the solo 401(k) wins on contribution capacity at almost every income level relevant to a physician doing meaningful 1099 work. Plan before December. Set it up. Fund it strategically. And make sure your S-Corp salary is calibrated with the contribution math in mind, not as an afterthought.

This is exactly the kind of thing that a physician-savvy accountant should be walking you through every year, not just at tax time. If your current accountant isn't proactively raising these questions, that's worth reflecting on.

Is This Deductible?

Solo 401(k) TPA fees — the setup costs and annual administration fees for your plan administrator — are deductible as ordinary business expenses when paid by your S-Corp or business entity. In 2026, that means a $1,015 annual administration fee at a 30% marginal rate saves you roughly $305 in taxes, on top of the far larger savings from the contributions themselves. Track these fees in your business records, pay them from your business account, and make sure your accountant is capturing them. They're easy to miss and entirely legitimate.

A Case Study Worth Noting

My client — I'll call her Dr. Whitfield — closed a longstanding practice and moved into 1099 work at a pace that fit her life. Three days a week, contract work, two separate LLCs, a non-compete she was navigating carefully. She was not, by any measure, a beginner at this. She had significant assets, a short-term rental with maxed depreciation, and a real estate exit strategy she was thinking through.

And still, the retirement account question had her uncertain. Not because she wasn't sophisticated — she clearly was — but because this particular comparison isn't taught in medical school, residency, or any continuing medical education you'll ever sit through. It's financial planning for independent physicians. And independent physicians don't always have someone in their corner who knows how these pieces fit together.

We went through the numbers together. She saw that with $250,000 in projected 2026 income, the solo 401(k) was the obvious choice. She saw that the TPA fees were noise compared to the tax savings. She got a referral to a physician-specific accountant who could support a next-level strategy. And she left the conversation with a clear path forward.

That's what good coaching looks like. Not complicated. Not overwhelming. Just the right framework, applied to your specific situation, at the right time.

Join the Movement

If you're doing 1099 work — or thinking about it — and you want a community of physician entrepreneurs asking these exact questions together, PEA Explorer membership is where to start. You'll get access to a library of free resources, including the S-Corp Advantage eBook, tools built specifically for physicians building micro-businesses.

Join PEA Explorer ($99/yr) and download your free eBook library

And if you want to sit down and work through your retirement account strategy, S-Corp salary, and tax plan together, a Business Strategy Session is the fastest way to get there.

Book a $500 Business Strategy Session — let's map your plan