The $300,000 Deduction Strategy Most CPAs Do Not Mention
If you own a successful business and earn $300,000 or more in self-employment or business income, your CPA has probably already maxed out your Solo 401(k). Twenty-three thousand five hundred in employee deferrals, another forty-something in employer contributions, maybe a $7,500 catch-up if you are over 50. Combined, you are looking at around $70,000 to $77,500 in retirement plan deductions for the year.
That sounds substantial until you realize it is barely making a dent in your tax bill. A high-income business owner earning $800,000 in net income still owes federal and state income tax on roughly $725,000 after the 401(k) deductions. At combined marginal rates of 45 percent or more, that is over $300,000 in tax owed annually.
There is another retirement plan option that almost nobody talks about publicly: the defined benefit plan. For high-income business owners aged 45 to 65, defined benefit plans can allow annual contributions of $200,000, $300,000, sometimes $400,000 or more. Combined with a Solo 401(k) or cash balance plan, the total retirement contribution can exceed $500,000 in a single year. The full contribution is tax-deductible.
This article walks through how defined benefit plans actually work, who they fit, the math at high-income levels, and why most CPAs do not proactively recommend them despite their power.
How Defined Benefit Plans Differ From What You Already Know
To understand why defined benefit plans can shelter so much more than a 401(k), it helps to understand the fundamental difference between the two structures.
Defined Contribution Plans (What You Probably Have)
A Solo 401(k), SEP-IRA, SIMPLE IRA, and similar plans are all “defined contribution” plans. The contribution amount each year is defined upfront. The IRS sets a maximum on what you can put in. The eventual benefit depends on how the contributions grow over time, but the annual contribution itself is capped at a known dollar amount.
For 2026, the limits are:
- Solo 401(k): $23,500 employee deferral + employer contribution up to 25 percent of compensation, capped at $70,000 total ($77,500 with catch-up at 50+)
- SEP-IRA: 25 percent of compensation, capped at $70,000
- SIMPLE IRA: $16,500 employee plus matching contribution
These caps were not designed for high-income business owners. They were designed for typical workers earning $50,000 to $200,000 per year. A business owner earning $1,000,000 hits the contribution cap at well under 10 percent of income.
Defined Benefit Plans (The Power Tool)
A defined benefit plan inverts the structure. Instead of defining the contribution amount upfront, the plan defines the eventual benefit (typically expressed as an annual pension payment in retirement). An actuary then calculates what annual contribution is required, given the plan participant’s age, compensation, and years of service, to fund that future benefit.
The IRS does cap the eventual benefit (currently around $280,000 per year of pension income at retirement age 62 to 65, indexed annually). But for older business owners who need to fund this benefit over fewer remaining years, the required annual contribution can be enormous.
A 55-year-old business owner targeting the maximum pension benefit might need annual contributions of $250,000 to $350,000 to fund it. A 60-year-old might need $350,000 to $450,000. These contributions are fully tax-deductible to the business in the year made.
The Key Insight
Defined contribution plans cap what you can save. Defined benefit plans cap what your eventual pension can be, then back into the contribution needed to fund it. For older high-income business owners, the math produces dramatically larger annual contributions.
The Math at High Income
A specific example shows why defined benefit plans get so much attention from advisors who actually understand them.
The Scenario
A 56-year-old business owner runs a successful professional services firm earning $900,000 per year in net business income. The owner is married with adult children, has accumulated meaningful retirement savings but not enough for the lifestyle they want in retirement, and has 10 to 12 years of expected high-income earning left.
Current tax planning: maxing out a Solo 401(k) with approximately $77,500 in annual contributions. Effective marginal tax rate (federal + state + Medicare surtax): approximately 47 percent.
Adding a Defined Benefit Plan
After consulting with an actuary, the owner establishes a defined benefit plan with a target retirement benefit at age 67 funded by contributions over the next 11 years. The actuary calculates required annual contributions of approximately $295,000.
Combined with the Solo 401(k) (which can be maintained alongside a defined benefit plan), the total retirement contribution becomes approximately $372,500 annually.
The Tax Savings
At a 47 percent marginal rate, the $295,000 defined benefit contribution alone produces approximately $138,000 in annual tax savings. Over 11 years of contributions, the cumulative tax savings approach $1,500,000.
Equally important, the contributions grow tax-deferred inside the plan. The owner is not just saving tax in the contribution year. They are also avoiding tax on the investment growth until distributions begin in retirement, when the tax rate is typically lower than during high-earning years.
The Long-Term Math
Over 11 years of $295,000 annual contributions growing at a conservative 6 percent annual return, the defined benefit plan accumulates approximately $4,400,000 by retirement. Combined with the Solo 401(k) contributions and growth, the owner enters retirement with $5,500,000+ in tax-advantaged retirement accounts, almost entirely funded with tax-deductible contributions.
This is not theoretical. Defined benefit plans have been doing this for high-income professionals and business owners for decades. The strategy is well-established, fully sanctioned under IRS rules, and used routinely by advisors who specialize in this space.
Who Defined Benefit Plans Actually Fit
Defined benefit plans are powerful but specific. They fit a particular profile of business owners.
The Right Age Range
The economics of defined benefit plans favor older participants. The closer you are to retirement age, the larger the required annual contributions become (because the plan has fewer years to fund the eventual benefit). The sweet spot is typically:
- Age 45 to 50: Useful but not dramatic. Contributions in the $100,000 to $200,000 range
- Age 50 to 55: Compelling math. Contributions in the $200,000 to $300,000 range
- Age 55 to 60: Powerful. Contributions in the $250,000 to $400,000 range
- Age 60+: Maximum impact. Contributions can exceed $400,000
Defined benefit plans work best for business owners with at least 10 to 15 years of expected high-income earning ahead but who are close enough to retirement that the funding math produces large contributions.
The Right Income Level
The contributions need to be supported by actual business income. The plan cannot contribute more than the business can fund out of cash flow. As a rough framework:
- Under $300,000 in net business income: Defined benefit plans usually do not justify the complexity
- $300,000 to $500,000: Workable but the contribution capacity is more limited
- $500,000 to $1,000,000: Strong fit for most business profiles
- Above $1,000,000: Substantial contributions become feasible
The Right Business Structure
Defined benefit plans work with multiple business structures, but some are simpler than others:
- Sole proprietors and single-member LLCs: Generally straightforward
- S corporations: Work well, with the owner taking compensation through the W-2 portion
- Partnerships: More complex due to coordination among partners
- Multi-owner businesses with employees: Significantly more complex (covered below)
The Employee Question
If the business has non-owner employees, defined benefit plans typically require contributions for those employees as well, under nondiscrimination rules. This can dramatically change the economics of the strategy.
For a solo business owner or a husband-and-wife business with no other employees, the strategy is clean: the owners get the full benefit. For a business with 5 to 10 employees, the plan needs to contribute to those employees too, which can add significant cost.
The math sometimes still works (the tax savings to the owners can exceed the cost of employee contributions), but the analysis becomes more nuanced. A “cash balance plan” (a hybrid structure discussed below) can sometimes address employee coordination more efficiently than a traditional defined benefit plan.
Cash Balance Plans: The Hybrid Variant
Cash balance plans are a hybrid between defined benefit plans and 401(k) plans. They have features of each:
How They Work
Like defined benefit plans, cash balance plans are technically pension plans. The annual contribution is determined by an actuary based on the participant’s age, compensation, and years until retirement. The plan funds a specific future benefit.
Like 401(k) plans, cash balance plans express each participant’s interest as an account balance that grows with annual “pay credits” and “interest credits.” Participants can see their account balance over time, similar to a 401(k) statement.
Why They Often Work Better Than Traditional DB Plans
Cash balance plans offer several practical advantages over traditional defined benefit plans:
- Easier to communicate to employees. The account balance format is familiar and intuitive, while traditional DB plan benefits are confusing
- More flexible benefit design. Different participants can have different pay credit rates, allowing for more sophisticated allocations
- Easier to terminate or modify. Traditional DB plans can be expensive to wind down. Cash balance plans are more flexible
- Better fit for businesses with employees. Pay credits for non-owner employees are typically smaller than the equivalent benefit in a traditional DB plan, reducing the employee coordination cost
For most modern high-income business owners considering a defined benefit-style strategy, cash balance plans are now the more common choice than traditional defined benefit plans.
The Contribution Math Is Similar
The contribution capacity in a cash balance plan is generally similar to a traditional defined benefit plan for the same profile. A 55-year-old business owner can typically contribute $200,000 to $300,000 to a cash balance plan, similar to what a traditional DB plan would allow.
Combining With Other Retirement Plans
One of the most powerful aspects of defined benefit and cash balance plans is that they can be combined with other retirement plans to maximize total annual contributions.
DB or Cash Balance Plus Solo 401(k)
The most common combination is a defined benefit or cash balance plan alongside a Solo 401(k). The two plans operate independently and contribute separately. For 2026, this combination can produce:
- Solo 401(k): Up to $77,500 ($70,000 base + $7,500 catch-up for age 50+)
- DB or cash balance plan: Varies by age and income, often $200,000 to $400,000+
- Combined total: $300,000 to $500,000+ in tax-deductible retirement contributions
For high-income business owners over age 50, this combination is one of the most powerful tax planning structures available.
The Coordination Rules
Combining the plans requires attention to IRS rules:
- Compensation must support both plans. The combined contributions cannot exceed the participant’s reasonable compensation
- Nondiscrimination rules apply across plans. If the business has employees, both plans must satisfy the testing requirements
- Plan documents must coordinate. The combined plan structure is typically called a “combo plan” and requires specific document language
Working with a third-party administrator (TPA) experienced in combo plan design is essential. The administrative complexity is real but manageable, and the TPA fees are small relative to the tax savings.
The Setup and Administrative Reality
Defined benefit and cash balance plans are more complex than 401(k) plans. The setup, administration, and reporting requirements need to be understood before committing.
Setup Requirements
Establishing a defined benefit plan typically requires:
- Plan documents drafted by an attorney or qualified TPA
- Actuarial certification of the plan design
- Determination letter from the IRS (recommended for larger plans, optional for smaller ones)
- Trust setup to hold the plan assets
- Investment policy and custodian selection
The full setup process typically takes 60 to 120 days from initial engagement to executed plan documents. This is why defined benefit plans cannot be implemented in November or December for current-year effect. They are a planning move that should start in the first half of the year.
Annual Administration
Each year, the plan requires:
- Actuarial valuation calculating the required annual contribution
- Form 5500 filing with the IRS
- Plan asset valuation and recordkeeping
- Employee notification and disclosure (if applicable)
Annual TPA fees typically range from $2,000 to $8,000 depending on plan complexity and the number of participants. For a high-income business owner saving $150,000+ in annual tax through the plan, the administrative cost is a small fraction of the benefit.
Funding Obligations
Unlike a 401(k), defined benefit plans create a funding obligation. Once you establish the plan, you must make the required contributions annually. The plan can be amended or terminated, but the existing funding obligations cannot be ignored.
This is one reason defined benefit plans work best for business owners with stable, predictable income. Highly variable income can create challenges if a low-income year arrives unexpectedly.
Termination Eventually
Defined benefit plans can be terminated when the business owner retires, sells the business, or otherwise no longer needs the structure. Termination typically involves:
- Final actuarial calculations
- Distribution of plan assets to participants (often rolled into IRAs)
- Final Form 5500 filing
- PBGC notification if applicable
Properly executed terminations preserve the tax-deferred status of the assets. The retirement savings continue growing tax-deferred in IRAs after the plan winds down.
Why Most CPAs Do Not Proactively Recommend This
For a strategy this powerful, the question becomes why it is not more widely used. Several reasons:
It Requires Specialized Knowledge
Most general practice CPAs do not work with defined benefit plans regularly. They know enough to mention 401(k)s and SEP-IRAs (which are simple to administer) but lack the actuarial fluency to design DB or cash balance plans. They route clients elsewhere by default.
It Requires a Multi-Year Commitment
Defined benefit plans create ongoing funding obligations. A CPA recommending the strategy is implicitly recommending several years of commitment. Many CPAs prefer to leave that decision to the client without proactive promotion.
The Administrative Burden Is Real
Annual actuarial work, Form 5500 filings, and plan compliance require coordination with a TPA. CPAs who do not have established TPA relationships may not recommend the strategy because they do not have a smooth referral path.
Most Clients Do Not Ask
Defined benefit plans are not widely discussed outside specialized circles. Most clients do not know to ask. CPAs respond to client questions, and if the question is not asked, the strategy is not raised.
Income Thresholds Filter the Population
Most clients are not in the income range where defined benefit plans make sense. CPAs serving a general clientele encounter qualifying clients rarely. The strategy stays out of their default toolkit.
The result is that most high-income business owners who would benefit from defined benefit plans never hear about them from their existing advisors. This is the gap the strategy presents and why prospects who reach out about it tend to be highly engaged.
Common Mistakes With Defined Benefit Planning
A few patterns consistently cause defined benefit plans to underperform their potential:
Starting Too Late in the Year
Defined benefit plans must be established by year-end to be used for the current year. The setup process takes 60 to 120 days. Last-minute attempts in November or December rarely succeed. Planning should begin no later than August or September for the same-year effect.
Ignoring the Employee Coordination Question
For businesses with non-owner employees, the cost of contributions for those employees can substantially change the math. A strategy that looks brilliant in isolation may be marginal when employee coordination is added. The analysis should include the employee piece from the start.
Choosing the Wrong Plan Design
Different defined benefit plan structures fit different situations. Traditional DB plans, cash balance plans, hybrid designs, and combo plans (with Solo 401(k)) all have different trade-offs. Selecting the wrong design can reduce the benefit by 20 to 40 percent.
Underfunding in Bad Years
Defined benefit plans create annual funding obligations. Business owners who try to reduce or skip contributions in low-income years can create compliance problems. Plan design should accommodate income variability through flexible contribution ranges, not by ignoring the obligation.
Failing to Plan the Exit
Defined benefit plans must eventually be terminated. The termination strategy should be planned at the time of plan establishment, not figured out years later. Properly designed plans wind down smoothly when the business owner retires or sells.
How a Defined Benefit Plan Fits Into Broader Tax Planning
Defined benefit plans are one tool among several for high-income business owners. They work best as part of an integrated strategy:
With Other Business Deductions
Defined benefit contributions are deductible to the business. They stack on top of all other legitimate business deductions including equipment depreciation, accountable plan reimbursements, family employment, and the QBI deduction. The combination produces dramatically lower taxable business income.
With Real Estate Strategies
For business owners who also own real estate, defined benefit plans complement rather than compete with real estate tax strategies. The two operate independently. Real estate produces depreciation deductions while the defined benefit plan produces retirement contribution deductions. Both reduce overall taxable income.
With Charitable Giving
In years of unusually high income (business sales, large bonuses, real estate gains), combining defined benefit contributions with coordinated charitable giving can substantially smooth tax exposure. Both strategies produce large deductions in the year executed.
With Estate Planning
The assets in a defined benefit plan are protected from creditors and can pass to a surviving spouse with minimal tax consequence. Coordinating the plan with broader estate planning produces integrated outcomes for both retirement income and wealth transfer.
The Honest Bottom Line
Defined benefit plans are one of the most powerful and most underused tax strategies available to high-income business owners. For the right profile (typically aged 45 to 65, earning $500,000 or more in business income, with stable income and a 10+ year planning horizon), they can produce annual tax savings of $100,000 to $200,000 and accumulate $4,000,000 to $7,000,000+ in tax-advantaged retirement assets over a decade of contributions.
The complexity is real but manageable. The setup takes 60 to 120 days. The ongoing administration requires a TPA and an actuary. The annual filings need to be done correctly. None of this is difficult for advisors who work with these plans regularly, but it does require advance planning and coordination.
If you are a business owner earning $500,000 or more who has not yet explored defined benefit or cash balance planning, contact our team to discuss whether the structure fits your situation. The analysis takes a few weeks to complete properly. The implementation takes a few months. The payoff is years of substantially lower tax exposure and a dramatically stronger retirement position.
Most high-income business owners walk past this strategy because their existing advisors do not raise it and they do not know to ask. The math is too compelling to leave on the table without at least running the numbers for your specific situation.
For broader context on how defined benefit plans fit into the full toolkit of business deduction strategies, the main service pages walk through how each piece coordinates with the others.
