What's the difference between a defined benefit plan and a cash balance plan?

A traditional defined benefit plan promises a specific monthly benefit at retirement (like a pension). A cash balance plan is a hybrid — it's technically a defined benefit plan but expresses the benefit as a hypothetical account balance that grows each year. Both allow the same large contributions. Cash balance plans are more common for small businesses because the benefit structure is easier to understand and the account balance is portable (can be rolled into an IRA or 401(k) when you leave).

Can I have both a 401(k) and a cash balance plan?

Yes — most high-contribution strategies combine them. A typical structure for a solo business owner: Solo 401(k) with employee deferral ($23,500 in 2025) plus employer profit-sharing contribution (up to 25% of W-2 salary), and a cash balance plan on top. The combined annual contribution can exceed $400,000 for a high earner in their 50s.

Do I have to fund the plan every year?

Yes — defined benefit plans have a required minimum contribution determined by an actuary each year. If you skip a year or underfund, you owe excise tax on the funding shortfall. This is the primary risk of a cash balance plan: it's a commitment. If your business has variable income, a more flexible plan (Solo 401(k) or SEP-IRA) may be more appropriate.

What happens to the cash balance plan if I hire employees?

Employees who meet eligibility requirements (typically age 21+ and one year of service) must be covered under the plan. If you hire employees, the contribution required for their benefit reduces the net tax savings. Plans with 10+ employees become significantly more expensive to administer and fund. This is why cash balance plans work best for solo owners or very small teams.

Can I roll a cash balance plan into an IRA when I retire or sell the business?

Yes — when you terminate the plan, the accumulated balance can be rolled into a traditional IRA or another qualified plan. This defers taxes on the entire balance until you take distributions in retirement. For a business owner who funds a cash balance plan for 10 years and then sells the business, the rollover allows the full balance to continue growing tax-deferred.

Who sets up and administers the plan?

A third-party administrator (TPA) specializing in defined benefit plans sets up the plan document, performs the annual actuarial valuation, calculates the required minimum contribution, and files Form 5500 with the Department of Labor. Annual TPA fees typically run $1,500–$4,000 for a solo plan. You also need a CPA familiar with these plans coordinating the deduction. This is not a DIY situation.

Tax planning

Defined Benefit and Cash Balance Plans: The High-Income Owner's $200,000+ Deduction

Solo 401(k) contributions cap out around $70,000. A cash balance plan can let a profitable business owner deduct $150,000 to $350,000 per year — dramatically lowering current-year tax bills while building a guaranteed retirement benefit.

Written by Matt Reese, CPA · 8 min read · Published April 2026·Share on LinkedIn

Key Takeaways

A cash balance plan is a type of defined benefit plan — the IRS-blessed structure that allows the largest retirement contributions, far exceeding 401(k) limits.
A 50-year-old business owner can often contribute $200,000–$300,000 per year to a cash balance plan. That's a full deduction against business income.
Cash balance plans work best for high-income sole owners (no employees, or few older employees) who can commit to funding the plan annually for several years.
The plan must be set up by December 31 of the year you want deductions. Unlike SEP-IRAs, you cannot establish a cash balance plan after year-end.

Why Solo 401(k) limits aren’t enough for high earners

A Solo 401(k) is one of the best retirement vehicles for self-employed owners — but the contribution limit in 2025 is $70,000 ($77,500 if you’re 50+). For a business owner netting $500,000 to $1,000,000 per year, that contribution represents a modest fraction of income. After income tax, state tax, and SE tax, a large portion of business profit simply becomes taxable — with no further shelter available from standard plans.

A defined benefit / cash balance plan changes that math. The IRS allows much larger contributions because defined benefit plans promise a fixed benefit at retirement — and funding that benefit requires larger annual contributions, especially for older owners who have fewer years of funding ahead.

The older you are and the more you earn, the larger the allowable cash balance contribution. A 55-year-old contributing $350,000 per year for 10 years can accumulate $3.5M in a tax-deferred account before distributions.

How cash balance plan contributions are calculated

A cash balance plan works by promising each participant a “pay credit” each year (a percentage of compensation) plus an “interest credit” on the accumulated balance. The business contribution that funds this benefit is calculated by an actuary based on:

Your age (older owners → larger required contributions to fund the same retirement benefit)
The target benefit at retirement (you set this, within IRS limits)
Years until retirement
Assumed investment return rate

Owner age	Approximate max annual contribution	10-year total accumulation
40	≈ $150,000–$175,000	≈ $1.75M
45	≈ $175,000–$225,000	≈ $2.0M
50	≈ $225,000–$280,000	≈ $2.5M
55	≈ $275,000–$350,000	≈ $3.0M
60	≈ $300,000–$400,000+	≈ $2.5M (fewer years remaining)

These are approximate ranges — the actual contribution limit is calculated annually by your plan’s actuary based on your specific situation. The IRS maximum benefit under a defined benefit plan in 2025 is $280,000 per year at retirement.

Stacking a cash balance plan with a 401(k)

Most high-contribution strategies stack a cash balance plan on top of an existing Solo 401(k). The two plans coexist — the 401(k) for employee deferrals and profit-sharing, the cash balance plan for the bulk of the deduction.

High-income owner, age 52 — combined plan contribution

Solo 401(k) employee deferral (2025 limit, age 50+)$31,000

Solo 401(k) employer profit-sharing (25% of W-2 salary of $150,000)$37,500

Cash balance plan contribution (actuarially determined)$275,000

Total retirement contribution$343,500

Federal income tax savings at 37% marginal rate≈ $127,100

California state income tax savings at 13.3%≈ $45,700

Total tax savings vs no retirement plan≈ $172,800

A 52-year-old S-corp owner with $500k in business income could contribute over $340,000 per year across a combined cash balance + 401(k) structure — saving roughly $170,000 in combined federal and California income tax annually.

Who this works for — and who it doesn’t

Cash balance plans produce the largest benefit under specific conditions:

Situation	Good fit for cash balance plan?	Why
Solo owner, no employees	Excellent	No coverage costs; all contributions benefit the owner
Owner + spouse only	Very good	Can cover spouse as employee; both benefit
Owner + 1–3 older, highly-compensated employees	Good	If employee contributions are acceptable trade-off
Owner with young, low-wage employees	Poor	Required employee contributions can exceed tax savings
Owner with variable income year to year	Risky	Required minimum contributions must be made regardless of profit
Owner who needs capital in the business	Consider carefully	Cash is locked away in the plan
Owner within 3 years of business sale	Usually not worth it	Setup costs and 3-year minimum investment period

Cash balance plans are a commitment

Unlike a SEP-IRA or Solo 401(k) where you can contribute any amount (or nothing) each year, a defined benefit plan has a required minimum contribution calculated annually. If business income drops and you can’t fund the requirement, excise tax applies. Before establishing a cash balance plan, make sure the business can sustain the required funding for at least 3–5 years.

The combined effect: deductions, tax deferral, and estate planning

A cash balance plan creates three layers of benefit:

Immediate deduction: Every dollar contributed reduces current-year taxable income. At a combined federal + California rate of 50%+, a $300,000 contribution generates $150,000+ in immediate tax savings.
Tax-deferred growth: The plan assets grow without current taxation. Compounded over 10–20 years, tax-deferred growth substantially outperforms a taxable account.
Rollover flexibility: At retirement or plan termination, the balance rolls into a traditional IRA and continues to grow tax-deferred until withdrawals begin at your marginal rate in retirement — typically lower than your peak earning years.

Set it up by December 31

Unlike a SEP-IRA (which can be established and funded until your tax return due date, including extensions), a defined benefit or cash balance plan must be established by December 31 of the year for which you want deductions. A plan established January 15 cannot be retroactively applied to the prior year. This is the most common mistake — high-income owners who hear about cash balance plans in February and discover they missed the window entirely. Start the conversation with your CPA in Q3.

How to get started

Setting up a cash balance plan requires a team — it’s not a DIY project:

A CPA familiar with defined benefit plans — coordinates the tax strategy, calculates the deduction, and ensures it’s integrated with your overall return
A third-party administrator (TPA) — sets up the plan document, performs the annual actuarial valuation, calculates the required minimum contribution, and files Form 5500 with the DOL
An investment advisor — manages the plan assets (the cash balance plan funds need to be invested; the investment return affects next year’s required contribution calculation)

Total annual TPA and actuarial fees for a solo cash balance plan typically run $1,500–$4,000 per year. On a $250,000 deduction saving $125,000 in taxes, the cost-benefit is overwhelmingly positive.

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Frequently asked

Questions owners actually ask

What's the difference between a defined benefit plan and a cash balance plan?: A traditional defined benefit plan promises a specific monthly benefit at retirement (like a pension). A cash balance plan is a hybrid — it's technically a defined benefit plan but expresses the benefit as a hypothetical account balance that grows each year. Both allow the same large contributions. Cash balance plans are more common for small businesses because the benefit structure is easier to understand and the account balance is portable (can be rolled into an IRA or 401(k) when you leave).
Can I have both a 401(k) and a cash balance plan?: Yes — most high-contribution strategies combine them. A typical structure for a solo business owner: Solo 401(k) with employee deferral ($23,500 in 2025) plus employer profit-sharing contribution (up to 25% of W-2 salary), and a cash balance plan on top. The combined annual contribution can exceed $400,000 for a high earner in their 50s.
Do I have to fund the plan every year?: Yes — defined benefit plans have a required minimum contribution determined by an actuary each year. If you skip a year or underfund, you owe excise tax on the funding shortfall. This is the primary risk of a cash balance plan: it's a commitment. If your business has variable income, a more flexible plan (Solo 401(k) or SEP-IRA) may be more appropriate.
What happens to the cash balance plan if I hire employees?: Employees who meet eligibility requirements (typically age 21+ and one year of service) must be covered under the plan. If you hire employees, the contribution required for their benefit reduces the net tax savings. Plans with 10+ employees become significantly more expensive to administer and fund. This is why cash balance plans work best for solo owners or very small teams.
Can I roll a cash balance plan into an IRA when I retire or sell the business?: Yes — when you terminate the plan, the accumulated balance can be rolled into a traditional IRA or another qualified plan. This defers taxes on the entire balance until you take distributions in retirement. For a business owner who funds a cash balance plan for 10 years and then sells the business, the rollover allows the full balance to continue growing tax-deferred.
Who sets up and administers the plan?: A third-party administrator (TPA) specializing in defined benefit plans sets up the plan document, performs the annual actuarial valuation, calculates the required minimum contribution, and files Form 5500 with the Department of Labor. Annual TPA fees typically run $1,500–$4,000 for a solo plan. You also need a CPA familiar with these plans coordinating the deduction. This is not a DIY situation.

Take the next step

Turn tax questions into a plan. Talk with Matt or see how we work with operating business owners.

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Educational content only.This article is for informational purposes and does not constitute tax, legal, or investment advice. Every owner’s facts are different; consult a qualified CPA and advisor before acting. Tax and accounting services are provided through Matt Reese, CPA; investment advisory services are provided through Measured Risk Portfolios, a registered investment adviser. Matt Reese, CPA and Measured Risk Portfolios are separate entities; clients are not required to engage both.