The $200,000 Tax Deduction Your CPA Never Mentioned
You maxed out your 401(k). You did your HSA. Maybe you even funded a backdoor Roth. And then April came around, and you still wrote a check to the IRS that made your stomach drop.
If you're earning $300,000, $500,000, or more — and you're treating a 401(k) as your primary tax shelter — you're playing the game with one hand tied behind your back.
There's a retirement plan that lets certain high earners deduct anywhere from $100,000 to $300,000+ per year from their taxable income. It's completely legal, IRS-approved, and it's been sitting in the tax code for decades. Most CPAs simply don't bring it up.
It's called a defined benefit plan — and for the right person, it's the single most powerful tax move available.
The 401(k) Isn't Enough — Not Even Close
A 401(k) is a fine starting point. But the math stops adding up fast when you're in the top tax brackets.
In 2025, the 401(k) employee contribution limit is $23,500 (plus a $7,500 catch-up if you're 50+). Even with profit sharing layered on top, total contributions cap out around $70,000 for most business owners.
If you're a physician pulling in $600,000 a year from your practice, a $70,000 deduction barely moves the needle. You're still paying federal income tax on over half a million dollars.
Meanwhile, a defined benefit plan built on top of — or instead of — a 401(k) can let you deduct an additional $100,000 to $200,000+ per year. That's real money.
The difference between maxing a 401(k) and layering in a defined benefit plan can be $60,000 to $90,000 in actual tax savings per year — every year you run it.
What Is a Defined Benefit Plan?
A defined benefit plan is a company-sponsored retirement plan where you fund a specific, guaranteed benefit at retirement — rather than simply contributing whatever you can and hoping the market cooperates.
Because the benefit is guaranteed, the IRS lets you pre-fund it with significantly larger contributions than a defined contribution plan like a 401(k).
The annual contribution is calculated by an actuary based on:
- Your age (the older you are, the higher the required contribution — and the bigger the deduction)
- Your income from the business
- Your desired retirement benefit (capped by IRS limits)
- The interest rate assumptions baked into the plan
The business makes the contribution. That contribution is fully tax-deductible. The money grows tax-deferred inside the plan. You pay taxes when you take distributions in retirement — ideally at a lower rate than you're paying now.
It's straightforward in concept, but the setup, actuarial calculations, and IRS compliance requirements mean most CPAs who don't specialize in this area never get around to recommending it.
How Much Can You Actually Shelter?
This is where it gets interesting. The numbers depend heavily on age and income, but here's a real-world sense of the range:
| Age | Approximate Max Annual Deduction |
|---|---|
| 45 | $130,000–$160,000 |
| 50 | $160,000–$210,000 |
| 55 | $200,000–$270,000 |
| 60 | $220,000–$310,000+ |
These numbers represent combined 401(k) profit sharing + defined benefit contributions for a solo or small-group business owner. Actual limits are actuarially determined and change with interest rates, so your number may be higher or lower.
The key point: if you're 52 years old, running an S-Corp or professional practice, and earning $500,000 or more, a combined plan can realistically put $180,000 to $230,000 in pre-tax contributions on the table every year.
At a 37% federal rate, that's potentially $66,000 to $85,000 in federal tax savings — annually. Add California or another high-tax state, and that number gets bigger.
A Real-World Walkthrough: The Surgeon Who Cut His Tax Bill in Half
Here's an anonymized example of how this plays out in practice.
The situation: A surgeon in his mid-50s, solo practice, filing as an S-Corp. He was earning roughly $650,000 in net income from the practice. His CPA had him maxing out a 401(k) and taking a "reasonable salary" for S-Corp purposes. His federal tax bill was consistently north of $180,000 per year.
The strategy: We helped him establish a combined cash balance (defined benefit) plan alongside his existing 401(k). His actuarially determined contribution for the first year came out to just over $215,000.
- 401(k) + profit sharing: $69,000
- Defined benefit contribution: $148,000
- Total pre-tax retirement contribution: $217,000
The result:
- Taxable income dropped from ~$650,000 to ~$433,000
- Federal income tax savings in year one: approximately $80,300
- State tax savings (California): approximately $19,100
- Total tax savings, year one: ~$99,400
He didn't change how he practiced medicine. He didn't take on more risk. He just restructured where his money went before the IRS got to it.
Over five years of running this plan before retirement, he's on track to shelter over $1 million in additional retirement savings — money that would have otherwise been taxed at his peak earning rate.
Who Qualifies — And Who Doesn't
A defined benefit plan isn't for everyone. Here's who it tends to work best for:
Strong candidates:
- Self-employed professionals or small business owners (physicians, attorneys, consultants, surgeons)
- S-Corp owners with consistent high income
- Business owners with few or no employees — adding employees increases the required contributions you must make on their behalf
- High earners over 45 who want to maximize deductions in peak earning years
- 1099-heavy earners who want to dramatically reduce their pass-through income
Less ideal for:
- Businesses with significant W-2 employee populations (the cost of funding employee benefits eats into the tax savings)
- Anyone in an early, high-growth phase who can't commit to consistent annual contributions — defined benefit plans require minimum annual contributions, not optional ones
- Earners under 40 where other strategies may generate higher ROI
Timing matters: Defined benefit plans must typically be established before December 31 to take the deduction for that tax year. Some plans can be set up as late as the business's tax filing deadline (including extensions), but early planning gives you more flexibility.
How to Get Started Before Year-End
The window to establish a plan for the current tax year closes faster than most people realize. If you're in Q4 and you haven't explored this, now is the time to act.
Here's what the process looks like:
- Initial strategy session — Confirm you're a good candidate based on income, age, entity structure, and employee headcount
- Actuarial analysis — A third-party actuary calculates your maximum deductible contribution
- Plan document drafted — Your plan is established and adopted before the deadline
- Contribution made — The business funds the plan (contributions can often be made up to the tax filing deadline)
- Annual administration — The plan is filed and updated each year with IRS Form 5500
The whole process, from first conversation to funded plan, typically takes a few weeks. The savings can last a decade or more.
If you're earning $300,000 or more and your CPA hasn't brought up a defined benefit plan, it's worth asking why. In many cases, the answer is simply that it falls outside what most generalist firms proactively manage.
That's exactly the kind of thing we do at Roadmap Tax — proactive, year-round strategy built around high earners who are tired of finding out in April what they could have done in October.
Call us at (619) 280-2700 or email info@RoadmapTax.com to book a free 30-minute strategy session. We'll show you what you've been leaving on the table — no obligation, no jargon, just numbers.