What is the best retirement plan for a 1099 physician?

For most 1099 physicians, the Solo 401(k) is the best starting point. It allows up to $72,000 in total contributions for 2026 ($24,500 employee deferral + up to 25% of net self-employment income as employer contribution), plus an $8,000 catch-up if you are 50+. It also supports Roth contributions, after-tax contributions (Mega Backdoor Roth), and loan provisions. If you need to shelter more than $72,000, adding a Cash Balance Plan can push total deductible contributions above $150,000 per year.

Solo 401(k) vs SEP-IRA: which is better for physicians?

The Solo 401(k) is superior in almost every scenario for physicians. Key advantages: (1) Higher contribution limits at lower income levels due to the employee deferral component. (2) Roth contribution option — SEP-IRAs do not allow Roth. (3) Mega Backdoor Roth capability (after-tax contributions with in-plan conversion). (4) Loan provisions up to $50,000. (5) Does not interfere with Backdoor Roth IRA strategy — a SEP-IRA creates pro-rata issues. The only advantage of a SEP-IRA is simpler setup, but for physicians earning $200K+, the Solo 401(k) wins on every dimension.

What is a Cash Balance Plan and how does it help physicians?

A Cash Balance Plan is a type of defined benefit (pension) plan that allows much larger tax-deductible contributions than a 401(k) alone — often $100,000 to $300,000+ per year depending on your age and income. The plan provides a guaranteed annual benefit credit (typically 5-7% of compensation) plus an interest credit. For a 50-year-old physician earning $500,000+, the combined Solo 401(k) + Cash Balance Plan can shelter $150,000-$250,000+ per year from current taxation. The tradeoff: higher setup costs ($2,000-$5,000), annual actuarial fees ($1,500-$3,000), and a 3-5 year commitment to funding.

Can I do a Backdoor Roth IRA as a physician?

Yes, and you should. The Backdoor Roth IRA strategy involves making a non-deductible contribution to a Traditional IRA ($7,000 for 2026, $8,000 if 50+) and then immediately converting it to a Roth IRA. This bypasses the income limits on direct Roth IRA contributions. The key requirement: you must have zero balance in any pre-tax Traditional, SEP, or SIMPLE IRA accounts at year-end to avoid pro-rata taxation on the conversion. This is one reason we recommend Solo 401(k) over SEP-IRA — a SEP-IRA balance creates pro-rata issues that block a clean Backdoor Roth.

What is the Mega Backdoor Roth strategy?

The Mega Backdoor Roth allows you to contribute after-tax dollars to your Solo 401(k) — above the $24,500 employee deferral and employer contribution — and then convert those after-tax contributions to Roth (either in-plan Roth conversion or rollover to a Roth IRA). The total 401(k) limit for 2026 is $72,000 ($80,000 if 50+). If your employee deferral ($24,500) plus employer contribution (25% of salary) is less than $72,000, you can fill the gap with after-tax contributions and convert them to Roth. This can add $20,000-$40,000+ per year to your Roth savings. Your Solo 401(k) plan document must explicitly allow after-tax contributions and in-plan Roth conversions.

How do S-Corp retirement contributions work?

With an S-Corp, retirement contributions are based on your W-2 salary — not total business income. The employee deferral ($24,500 for 2026) comes from your salary. The employer contribution (up to 25% of W-2 salary) is paid by the S-Corp and deducted as a business expense. For example, with a $200,000 S-Corp salary: employee deferral = $24,500, employer contribution = $50,000 (25% of $200K), total = $74,500 (exceeds limit, capped at $72,000). Setting your S-Corp salary affects your maximum employer contribution — another reason salary optimization matters.

What are the 2026 retirement contribution limits?

For 2026: Solo 401(k) employee deferral = $24,500 ($32,500 if 50+). Total 401(k) limit (employee + employer) = $72,000 ($80,000 if 50+). SEP-IRA limit = lesser of 25% of compensation or $72,000. Traditional/Roth IRA = $7,500 ($8,600 if 50+). HSA = $4,400 individual / $8,750 family. Cash Balance Plan = varies by age and plan design, typically $100,000-$300,000+. These limits are indexed for inflation and updated annually.

Should I contribute pre-tax or Roth to my Solo 401(k)?

For most high-income physicians in the 35-37% tax bracket, pre-tax contributions provide the largest immediate tax savings. However, if you expect to be in a similar or higher bracket in retirement, or if you want tax diversification, Roth contributions make sense for a portion of your savings. A common strategy: make the employee deferral ($24,500) as Roth, and the employer contribution (which must be pre-tax) provides the tax deduction. This gives you both tax-free growth (Roth) and current-year tax savings (employer contribution).

401(k)

Physician Tax Strategy

Retirement Plans for Physicians:
Solo 401(k), SEP-IRA & Cash Balance

Shelter $72,000 to $250,000+ per year from taxes. The most powerful wealth-building lever for 1099 physicians — and the most underutilized.

22 min read Updated March 2026 By Bryan Martin, CPA

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Solo 401(k) vs SEP-IRA

Head-to-Head Comparison for 1099 Physicians

The Solo 401(k) and SEP-IRA are the two most common retirement plans for self-employed physicians. Both allow substantial tax-deferred contributions, but the Solo 401(k) wins in virtually every category that matters for high-income physicians. Here is why.

$72,000

2026 Solo 401(k) total limit ($80,000 if 50+)

$250K+

Possible annual deduction with Solo 401(k) + Cash Balance

37%

Top federal bracket — every dollar sheltered saves $0.37

Solo 401(k) vs SEP-IRA: Feature Comparison

Feature	Solo 401(k)	SEP-IRA
2026 Maximum Contribution	$72,000 ($80,000 if 50+)	$72,000
Employee Deferral	$24,500 ($32,500 if 50+)	Not available
Employer Contribution	Up to 25% of W-2 salary	Up to 25% of compensation
Roth Contributions	Yes (employee deferral)	No
After-Tax Contributions (Mega Backdoor Roth)	Yes (if plan allows)	No
Loan Provisions	Up to $50,000	No
Backdoor Roth IRA Compatible	Yes (no pro-rata issues)	No (creates pro-rata issues)
Contribution at Lower Income	Higher (due to employee deferral)	Lower (employer-only)
Setup Complexity	Moderate (plan document required)	Simple (one-page form)
Annual Filing	Form 5500-EZ when assets > $250K	None
Best For	Physicians earning $100K+	Very simple situations only

The Solo 401(k) wins for physicians because of the employee deferral component. A SEP-IRA only allows employer contributions (25% of compensation), meaning at $200,000 in salary you can only contribute $50,000. With a Solo 401(k), you get $24,500 employee deferral PLUS $50,000 employer contribution = $74,500 (capped at $72,000 total). At lower incomes, the gap is even larger — a physician earning $120,000 can contribute $54,500 to a Solo 401(k) but only $30,000 to a SEP-IRA.

Contribution Comparison at Different Income Levels

S-Corp Salary	Solo 401(k) Max	SEP-IRA Max	Solo 401(k) Advantage
$100,000	$49,500	$25,000	+$24,500
$150,000	$62,000	$37,500	+$24,500
$200,000	$72,000*	$50,000	+$22,000
$250,000	$72,000*	$62,500	+$9,500
$290,000+	$72,000*	$72,000*	$0 (both hit cap)

* Contribution limits shown for under-50. Add $8,000 catch-up for Solo 401(k) if 50+. The Solo 401(k) advantage is most significant at income levels below $290,000 — which is where the employee deferral creates the gap.

SEP-IRA Kills Your Backdoor Roth

If you have a SEP-IRA with a pre-tax balance, it creates pro-rata issues when you do a Backdoor Roth IRA conversion. The IRS treats all Traditional IRA balances (including SEP-IRA) as one pool — so your conversion will be partially taxable. A Solo 401(k) avoids this problem entirely because 401(k) balances are NOT included in the pro-rata calculation. If you plan to do Backdoor Roth conversions (and you should), use a Solo 401(k) — not a SEP-IRA. If you already have a SEP-IRA, you can roll it into a Solo 401(k) to clear the pro-rata issue.

Cash Balance Plans for High Earners

$100,000+ Annual Tax Deductions

If you are maxing out your Solo 401(k) at $72,000-$80,000 per year and still have substantial income being taxed at 35-37%, a Cash Balance Plan is the next level. This defined benefit (pension) plan allows dramatically larger contributions — often $100,000 to $300,000+ per year — depending on your age, income, and plan design.

Cash Balance Plans work alongside your Solo 401(k). You contribute to both — the Solo 401(k) handles the first $72,000, and the Cash Balance Plan handles the additional $100,000+. The combined deduction can shelter $150,000-$250,000+ from current-year taxes.

Cash Balance Contribution Limits by Age

Age	Estimated Annual Cash Balance Contribution	Combined with Solo 401(k)	Tax Savings at 37%
35	$60,000 - $80,000	$129,000 - $149,000	$47,730 - $55,130
40	$80,000 - $120,000	$149,000 - $189,000	$55,130 - $69,930
45	$120,000 - $160,000	$189,000 - $229,000	$69,930 - $84,730
50	$160,000 - $220,000	$236,500 - $296,500*	$87,505 - $109,705
55	$220,000 - $300,000	$296,500 - $376,500*	$109,705 - $139,305
60	$280,000 - $350,000+	$356,500 - $426,500+*	$131,905 - $157,805+

* Includes $80,000 Solo 401(k) with catch-up for age 50+. Cash Balance contributions vary based on actuarial assumptions, plan design, and investment returns. These are estimates — actual amounts determined by plan actuary.

The Cash Balance Plan becomes increasingly powerful with age. A 55-year-old surgeon netting $600,000 could shelter $300,000+ per year between the Solo 401(k) and Cash Balance Plan — saving over $110,000 in federal taxes annually. Over 10 years to retirement, that is $1.1 million in tax savings, plus tax-deferred growth on the contributions.

Cash Balance Plan: Costs and Tradeoffs

Advantages

Massive tax deductions ($100K-$300K+/year)
Contributions grow tax-deferred
Can roll over to IRA at retirement
Creditor protection in most states
Reduces AGI for other tax benefits
Stacks on top of Solo 401(k)

Tradeoffs

Setup cost: $2,000-$5,000 (one-time)
Annual actuarial fees: $1,500-$3,000
3-5 year funding commitment (not optional)
Mandatory contributions even in low-income years
If you have employees, you must contribute for them too
More complex administration than Solo 401(k)

Pro Tip

Cash Balance Plans are ideal for physicians with stable, high income who plan to maintain that income for at least 3-5 years. If your income fluctuates significantly year to year (common for new locum tenens physicians), wait until your income stabilizes before committing to a Cash Balance Plan. The mandatory contribution requirement can be burdensome in a low-income year. Start with a Solo 401(k) and add the Cash Balance Plan once your income is predictable.

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Backdoor Roth IRA Strategy

Tax-Free Growth for High-Income Physicians

Direct Roth IRA contributions are prohibited above certain income levels ($161,000 MAGI for single, $240,000 for MFJ in 2026). Since virtually all physicians exceed these limits, the Backdoor Roth IRA is the workaround — and every physician should be doing it. It is simple, legal, and the IRS has explicitly acknowledged it.

Backdoor Roth IRA: Step-by-Step

Contribute to a Traditional IRA (Non-Deductible)

Make a non-deductible contribution to a Traditional IRA. For 2026: $7,500 ($8,600 if 50+). There is no income limit on non-deductible Traditional IRA contributions. Do NOT deduct this contribution on your tax return.

Wait Briefly, Then Convert to Roth IRA

Convert the entire Traditional IRA balance to your Roth IRA. Some advisors recommend waiting a few days; others convert immediately. There is no required waiting period in the tax code. The conversion is reported on Form 8606.

Ensure Zero Pre-Tax IRA Balance

This is the critical step. You must have ZERO balance in any pre-tax Traditional, SEP, or SIMPLE IRA accounts on December 31 of the conversion year. If you have pre-tax IRA balances, the conversion is partially taxable due to the pro-rata rule. Roll any SEP-IRA into your Solo 401(k) before year-end.

Report on Your Tax Return

File Form 8606 Part I (non-deductible contribution) and Part II (Roth conversion). If you had zero pre-tax IRA balance, the taxable amount of the conversion is $0 (or minimal — just any gains between contribution and conversion).

Repeat Every Year

Do this every year. Over 20 years, that is $150,000+ in Roth contributions that grow and are withdrawn completely tax-free in retirement. For a married couple both doing Backdoor Roth, that doubles to $300,000+.

The Pro-Rata Rule: The #1 Backdoor Roth Killer

If you have ANY pre-tax balance in a Traditional IRA, SEP-IRA, or SIMPLE IRA on December 31 of the year you convert, the IRS applies the pro-rata rule. This means your conversion is partially taxable based on the ratio of pre-tax to after-tax money across ALL your IRAs. Example: if you have $93,000 in a SEP-IRA (pre-tax) and contribute $7,000 non-deductible to a Traditional IRA, then convert $7,000 to Roth — 93% of the conversion ($6,510) is taxable. The fix: roll your SEP-IRA into your Solo 401(k) before year-end. This removes the pre-tax balance from the IRA calculation.

This is another critical reason to choose a Solo 401(k) over a SEP-IRA. A Solo 401(k) balance does not count in the pro-rata calculation. A SEP-IRA balance does. If you have an existing SEP-IRA, roll it into a Solo 401(k) and then your Backdoor Roth conversions are clean.

Mega Backdoor Roth

After-Tax 401(k) Contributions — The Advanced Strategy

The Mega Backdoor Roth is the most powerful Roth contribution strategy available — and it is only possible through a Solo 401(k). It allows you to contribute after-tax dollars above the normal $24,500 employee deferral and then convert those contributions to Roth, either through an in-plan Roth conversion or a rollover to a Roth IRA.

The total 401(k) annual addition limit for 2026 is $72,000 ($80,000 if 50+). This limit includes employee deferrals, employer contributions, AND after-tax contributions. If your employee deferral plus employer contribution does not fill the entire $72,000, you can fill the gap with after-tax contributions — and immediately convert them to Roth.

Mega Backdoor Roth: How It Works

Example: Dr. Patel, Age 42, S-Corp Salary $180,000

Contribution Type	Amount	Tax Treatment
Employee Deferral (Roth)	$24,500	After-tax (Roth) — grows tax-free
Employer Contribution (Pre-tax)	$45,000 (25% of $180K)	Pre-tax — taxed on withdrawal
Subtotal	$69,500
After-Tax Contribution (Mega Backdoor)	$2,500	After-tax — convert to Roth immediately
Total 401(k) Contributions	$72,000	At the annual limit
+ Backdoor Roth IRA	$7,500	Tax-free growth
Total Retirement Savings	$79,500

In this example, the Mega Backdoor Roth room is only $2,500 because the employer contribution nearly fills the gap. The strategy becomes more valuable when your employer contribution is smaller — for example, at a lower S-Corp salary.

When Mega Backdoor Roth Is Most Valuable

S-Corp Salary	Employee Deferral	Employer (25%)	After-Tax Room	Mega Backdoor Potential
$100,000	$24,500	$25,000	$22,500	High
$150,000	$24,500	$37,500	$10,000	Moderate
$200,000	$24,500	$47,500**	$0*	None (at cap)
$250,000+	$24,500	$47,500**	$0*	None (at cap)

* Employer contribution capped at $47,500 ($72,000 - $24,500). ** 25% of salary exceeds remaining room. At higher salaries, the employer contribution alone fills the gap — leaving no room for Mega Backdoor Roth.

Pro Tip

The Mega Backdoor Roth is most valuable for physicians with lower S-Corp salaries (in the $100K-$150K range) where the employer contribution does not fill the $72,000 cap. However, setting a lower salary just to create Mega Backdoor room is not always optimal — you must balance this against reasonable compensation requirements and SE tax savings. Your Solo 401(k) plan document must specifically allow after-tax contributions and in-plan Roth conversions. Not all plan providers support this — ask before opening the account.

S-Corp Retirement Plan Math

How Your W-2 Salary Drives Contribution Limits

When you operate as an S-Corp, your retirement plan contributions are based on your W-2 salary — not your total business income. This creates an important planning dynamic: your S-Corp salary determines both your payroll tax burden AND your maximum retirement plan contributions.

The employee deferral ($24,500 / $32,500 if 50+) is straightforward — it comes out of your salary. The employer contribution is capped at 25% of your W-2 salary and is paid by the S-Corp as a deductible business expense. This means a higher salary = higher employer contribution capacity.

Solo 401(k) Contributions by S-Corp Salary Level

S-Corp Salary	Employee Deferral	Employer (25%)	Total Solo 401(k)	Notes
$80,000	$24,500	$20,000	$44,500	Good starting point
$120,000	$24,500	$30,000	$54,500	Strong contribution level
$150,000	$24,500	$37,500	$62,000	Near-optimal for most
$180,000	$24,500	$45,000	$69,500	Nearly at the cap
$190,000+	$24,500	$47,500	$72,000	Hits maximum 401(k) limit
$200,000 (age 50+)	$32,500	$50,000	$80,000*	Maximum with catch-up

* Total capped at $80,000 for 2026 with catch-up. The employer contribution percentage applies to W-2 salary only. Employer contribution is a deductible business expense for the S-Corp.

Notice the critical salary of $190,000 — at this salary level, the 25% employer contribution ($47,500) plus $24,500 employee deferral hits the $72,000 cap. Setting your salary above $190,000 does not increase your Solo 401(k) contribution. This is one factor in the S-Corp salary optimization equation — along with reasonable compensation, SE tax savings, and QBI deduction tradeoff.

Retirement Contribution Estimator

Net Business Income

S-Corp Salary (W-2)

Your Age

Solo 401(k) Total

$72,000

SEP-IRA Max

$50,000

+ Cash Balance (Est.)

$140,000

Est. Tax Savings (37%)

$78,440

Cash Balance estimates vary significantly based on plan design, age, and actuarial assumptions. Book a call for a precise analysis with your specific numbers.

Sole Prop vs S-Corp: Different Employer Contribution Formulas

If you are a sole proprietor (Schedule C) instead of an S-Corp, the employer contribution calculation is different. It is based on net self-employment income after the deductible half of SE tax — effectively about 20% of net income (not 25% of salary). This means the employer contribution is lower for a sole prop at the same income level. Another advantage of the S-Corp election: you control the salary, which controls the employer contribution percentage cleanly.

Plan Comparison at Different Income Levels

Which Plans to Stack at Each Income Tier

The optimal retirement plan stack depends on your income level, age, and how much you want to shelter from current-year taxes. Here is a tier-by-tier breakdown for physicians.

Net Income	Recommended Plan Stack	Max Annual Contribution	Annual Tax Savings (37%)
$80,000 - $150,000	Solo 401(k) + Backdoor Roth IRA	$50,000 - $72,000	$18,500 - $26,640
$150,000 - $300,000	Solo 401(k) + Backdoor Roth IRA + HSA	$72,000 + $7,500 + $8,750	$28,305 - $32,653
$300,000 - $500,000	Solo 401(k) + Cash Balance + Backdoor Roth + HSA	$150,000 - $250,000+	$55,500 - $92,500+
$500,000+	Solo 401(k) + Cash Balance (max) + Backdoor Roth + HSA	$200,000 - $350,000+	$74,000 - $129,500+

Complete Retirement Vehicle Comparison

Plan Type	2026 Max Contribution	Tax Treatment	Best For
Solo 401(k) (Pre-Tax)	$72,000 ($80,000 if 50+)	Tax-deductible now, taxed on withdrawal	Maximum current-year deduction
Solo 401(k) (Roth)	$24,500 ($32,500 if 50+)	After-tax now, tax-free withdrawal	Tax diversification, young physicians
SEP-IRA	$72,000 (25% of comp)	Tax-deductible now, taxed on withdrawal	Simple situations (not recommended)
Cash Balance Plan	$100,000 - $350,000+	Tax-deductible now, taxed on withdrawal	High earners 40+ wanting massive deductions
Backdoor Roth IRA	$7,500 ($8,600 if 50+)	After-tax now, tax-free withdrawal	Every physician regardless of income
Mega Backdoor Roth	Varies (fills 401k gap)	After-tax, convert to Roth	Physicians with lower S-Corp salary
HSA	$4,400 / $8,750 family	Triple tax-free (deductible + growth + withdrawal)	Every physician with HDHP

Pro Tip

The HSA is often overlooked but provides the only triple tax advantage in the tax code: contributions are deductible, growth is tax-free, and qualified withdrawals are tax-free. If you have a high-deductible health plan, max out your HSA ($8,750 for family in 2026) before considering taxable investments. After age 65, HSA withdrawals for any purpose are penalty-free (just taxed as income, like a Traditional IRA). Think of it as a stealth retirement account.

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Common Retirement Planning Mistakes

Avoid These Costly Errors

Mistake #1: Using a SEP-IRA instead of a Solo 401(k)

The SEP-IRA is easier to set up but costs you in three ways: lower contributions at the same income level (no employee deferral), no Roth option, and it blocks your Backdoor Roth IRA due to pro-rata rules. For any physician earning $100K+, the Solo 401(k) is strictly superior. If you have a SEP-IRA, roll it into a Solo 401(k) immediately.

Mistake #2: Not doing the Backdoor Roth IRA every year

This is free money left on the table. Every physician — regardless of income — should be contributing $7,500-$8,600 per year to a Roth IRA via the Backdoor strategy. Over a 25-year career, that is $187,500-$215,000 in Roth contributions growing completely tax-free. For a married couple, double it.

Mistake #3: Not considering a Cash Balance Plan

If you are 40+ and earning $300,000+ consistently, failing to implement a Cash Balance Plan means you are leaving $40,000-$100,000+ per year in tax deductions on the table. Yes, there are costs and commitments — but the tax savings dwarf the administrative expenses by 10x or more.

Mistake #4: Having pre-tax IRA balances that block Backdoor Roth

Many physicians have old SEP-IRAs, rollover IRAs, or Traditional IRAs with pre-tax money. These create pro-rata issues that make the Backdoor Roth partially taxable. The fix: roll all pre-tax IRA money into your Solo 401(k) or employer 401(k) before December 31. This clears the pro-rata problem.

Mistake #5: Missing contribution deadlines

Solo 401(k) employee deferrals must be made by December 31 (for calendar-year filers). Employer contributions can be made until the tax filing deadline (March 15 for S-Corps, April 15 for sole props, plus extensions). Many physicians miss the employee deferral deadline — losing the $24,500 contribution for that year permanently.

Mistake #6: Not optimizing S-Corp salary for retirement contributions

Your S-Corp salary directly determines your employer contribution limit (25% of salary). Setting salary too low reduces your retirement plan capacity. Setting it too high wastes payroll tax savings. The optimal salary balances reasonable compensation, SE tax savings, QBI deduction, and retirement contributions — all modeled simultaneously.

Mistake #7: Ignoring the Mega Backdoor Roth opportunity

If your Solo 401(k) employee deferral plus employer contribution is less than $72,000, you have room for after-tax contributions that can be converted to Roth. This is the Mega Backdoor Roth — and it can add $10,000-$40,000+ per year to your Roth savings. Your plan document must allow after-tax contributions and in-plan Roth conversions.

Frequently Asked Questions

Physician Retirement Plans

Related Physician Tax Guides

S-Corp Election for Physicians

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Physician Tax Deductions

Every deduction available to physicians — from CME to home office to retirement contributions.

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Solo 401(k) Strategy Guide

The complete Solo 401(k) setup, contribution, and investment guide for self-employed professionals.

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Every Dollar Not Sheltered Is a Dollar Taxed at 37%. Let's Fix That.

We'll analyze your income, entity structure, age, and goals to design the optimal retirement plan stack — Solo 401(k), Cash Balance, Backdoor Roth, and Mega Backdoor Roth. One call. Real numbers. No obligation.

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