The Best Retirement Plan for Physician Practice Owners: 401(k), SEP-IRA, or Cash Balance?

One of the most common questions I get from physician clients who own their own practice is simple?

How can I reduce my tax bill?

When your income climbs into the high six figures, taxes are no longer just a nuisance—they’re one of your largest expenses. And unlike W-2 physicians, small-business owners have significantly more control over how much they pay.

One of the most powerful ways to reduce taxes, while simultaneously building long-term wealth, is through a well-designed retirement plan.

But here’s the challenge:

Not all retirement plans are created equal.

And the best retirement plan options for physician practice owners depend heavily on your income, age, and whether you have employees.

The Three Main Retirement Plan Options

For most physician practice owners, retirement plan options fall into three broad categories:

•   Defined contribution Plans (401(k)s)

•  Employer-sponsored IRA plans (SEP or SIMPLE)

• Defined Benefit Plans (Cash Balance Plans)

Each comes with tradeoffs in flexibility, cost, complexity, and tax savings potential.

If you’re trying to quickly understand how these options compare, here’s a simplified breakdown:

Plan Type	Best For	Contribution Potential	Flexibility	Complexity	Key Drawback
401(k) + Profit Sharing	Most physician owners	Up to ~$72,000	High	Moderate	Limited max contribution
Solo 401(k)	No employees	Up to ~$72,000	Very High	Low	Only works solo
SEP-IRA	Very small/simple practices	Up to ~$72,000	Moderate	Low	Must contribute equally
SIMPLE IRA	Small teams (<100 employees)	~$17,000 + match	Low	Low	Low limits, required match
Cash Balance Plan	High-income, older physicians	$150k–$300k+ combined	Low	High	Cost + required funding

Now that you have a high-level view of how these plans compare, let’s take a closer look at each option—starting with the most common foundation for physician owners: the 401(k).

Defined Contribution Plans

These are the most familiar and widely used retirement plans.

Key Rules:

• Employee contribution limits: $24,500 (2026)

• Total contributions (employee + employer): up to $72,000 (2026) or 25% of employee compensation, whichever is lower

• Participant-directed investments

• No guaranteed outcome (investment risk is on the employee)

• There are catch-up opportunities for employees older than age 50

For most physician owners, the 401(k)—especially when paired with a profit-sharing component—is the foundational retirement plan.

It offers flexibility, relatively low cost, and meaningful tax deferral, but it has limits. Once income rises, many physicians find that maxing out a 401(k) is no longer enough to meaningfully reduce their tax burden.

Key Advantages:

• Flexible contributions

• Optional profit-sharing

• Lower administrative burden compared to DB plans

• Employer contributions are discretionary

Key Disadvantages:

• Contribution limits cap tax savings

• Must cover eligible employees

• Administrative requirements

Employer-Sponsored IRA plans

These plans prioritize simplicity over optimization.  

In practice, they are most useful for:

• Very small practices

• Lower-income business owners

• Situations where simplicity is more important than maximizing tax savings

For high-income physician owners, these are typically stepping stones—not end-game strategies

The two main options are:

SEP-IRA (Simplified Employee Pension):

• Employer-only contributions

• Same contribution limits as a 401(k)

• Flexible yearly contributions

• Must contribute equally for all employees

SIMPLE IRA:

• Employee contributions allowed (limited to $17,000/year currently)

• Mandatory employer contributions (small)

• Available only for businesses with ≤100 employees

 Advantages:

• Easy to set up and administer

• Lower cost

• Minimal compliance burden

Disadvantages:

• Less flexibility

• Lower contribution limits (SIMPLE)

• Immediate vesting

• Limited optimization for high earners

Defined Benefit plans (Cash Balance Plans)

This is where things get interesting.

Defined benefit plans (pensions) provide a guaranteed future benefit, with the employer responsible for funding it.

For high-income physicians—especially those in their 40s, 50s, or early 60s—a cash balance plan can dramatically increase the amount of income that can be deferred from taxes each year.

It’s not uncommon to see total annual contributions (401(k) + cash balance) exceed:

 $150,000–$300,000+ per year

Key Features:

• 100% employer funded

• Actuary required to determine contributions

• Investment risk borne by employer

• 3-year vesting schedule

Advantages:

•  Very high contribution limits

• Age-weighted benefits favor older physicians

• Significant tax reduction potential

Disadvantages:

•  Higher cost and complexity

• Required annual contributions, set by actuary

• Less flexibility

• Difficult to unwind

So What’s the Best Option?

The answer depends on three key factors:

1.       Your Income

• Under ~$150–200k → 401(k) may be sufficient

• $200k–$500k → 401(k) + profit sharing

• $500k+ → Consider adding a cash balance plan

2.      Your Age

• Younger physicians → less benefit from DB plans

• Older physicians → significantly higher contribution limits

  
  

3.      Whether You Have Employees

• No employees → Solo 401(k) (best flexibility)

• Few employees → 401(k) + profit sharing

• Larger staff → Requires careful plan design

  
  

The Real Strategy

In reality, the “optimal” strategy is often not choosing one plan—but layering them together:

• 401(k) (employee deferral)

• Profit-sharing (employer contribution)

• Cash balance plan (additional tax deferral)

  
  

This approach allows you to:

• Maximize tax savings

• Maintain flexibility

• Control employee cost

 Bottom Line

The goal isn’t just to save on taxes this year.

It’s to build a system that:

• Maximizes long-term wealth

• Maintains flexibility

• Aligns with your career timeline

  
  

Because in the end, the right structure isn’t just about minimizing taxes—it’s about creating financial clarity and control over your future.

If you’re a physician business owner trying to navigate these decisions, this is exactly the kind of planning we help clients with every day.

Designing the right retirement plan isn’t just about maximizing contributions—it’s about coordinating taxes, investments, and long-term goals into a cohesive strategy.

If you’d like help building that structure, you can learn more about working with us here.

Disclaimer: the material in this blog post is intended for general educational purposes only and should not be considered specific financial advice. You should always consult with your personal financial advisor to see how it might fit within your personalized financial plan.