A business owner who’s already maxing out a 401(k) and still wants to shelter significantly more income has essentially one real option left: a cash balance plan. It’s a defined benefit pension in legal structure, but it’s built and communicated to feel like a 401(k) — and that hybrid design is exactly what makes it powerful for owners starting late.
What It Actually Is
A cash balance plan expresses your benefit as a hypothetical account balance rather than a monthly annuity, even though it’s legally a defined benefit pension. Each year the employer credits a “pay credit” to your notional account, and the plan credits a stated interest rate on top — typically in the 3%–5% range, set in the plan document rather than tied to actual investment performance the way a 401(k) balance is.
Why the Contribution Isn’t a Fixed Number
Unlike a 401(k), a cash balance plan has no flat annual dollar cap on its own. An actuary instead calculates how much the employer must contribute each year to fund a target benefit by a typical retirement age (usually 62) — and because an older owner has fewer years left to reach that target, their required annual contribution runs dramatically higher than a younger participant’s, sometimes ranging from roughly $100,000 to $350,000 or more depending on age and compensation.
The 2026 Numbers That Actually Cap It
The real ceiling isn’t a plan-design number, it’s the same IRC 415(b) limit that caps every defined benefit pension: for 2026, the maximum annual benefit the plan can be designed to pay out is $290,000, up from $280,000 in 2025, and the IRS compensation limit used in the underlying calculations is $360,000. Those two figures — not an arbitrary account cap — are what an actuary is funding toward.
Why It’s Built for Late-Career Owners, Not Startups
The age-weighted funding math is the whole point: a 60-year-old owner needing to fund a meaningful retirement benefit in a handful of remaining working years gets a far larger deductible contribution than a 35-year-old employee would in the same plan. This is precisely the opposite skew of a straight profit-sharing 401(k), where contribution limits are flat regardless of age.
Pairing It With a Safe Harbor 401(k)
Cash balance plans are almost always layered on top of an existing Safe Harbor 401(k), not run alone — the combination is what produces headline figures in the $150,000 to $340,000-plus range of total annual tax-deductible retirement contributions for a single owner, split between the 401(k)’s own $72,000 combined cap (see our 2026 contribution limits guide) and whatever the cash balance actuary calculates on top.
The Real Tradeoff
Unlike a 401(k), a cash balance plan requires an actuary, carries real annual administration costs, and generally commits the business to funding it for several years running — it’s not something to set up for a single high-income year and abandon, and it typically requires providing a meaningful benefit to rank-and-file employees too, not just the owner.
The Bottom Line
If a business owner in their 50s or 60s has already maxed a Safe Harbor 401(k) and still has significant income to shelter, a cash balance plan is the real next lever — but the actuarial commitment involved means it’s worth running the numbers with a plan administrator before assuming the eye-catching six-figure contribution ranges apply to your specific age and compensation.
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