Cash Balance Plan vs. 401(k)
A 401(k) caps total additions at $72,000 for 2026; a cash balance plan for an owner in their mid-50s can fund several times that. This guide compares the two on limits, flexibility, and cost, and shows the combination design most owners end up with.
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Reviewed by Alexander Tecle, MBA, MS Taxation
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Two plan layers to evaluate
401(k)
Employee deferrals and employer contributions.
Cash balance
An employer-funded pension benefit with actuarial funding.
Combined design
Evaluate the owner benefit, employee cost and ongoing obligations together.
| Feature | 401(k) + profit sharing | Cash balance plan |
|---|---|---|
| 2026 annual maximum | $72,000 total additions ($24,500 deferral + employer money); catch-ups on top | Actuarially set — commonly $100,000–$300,000+, growing with age |
| Contribution flexibility | Fully discretionary year to year | Expected annually within an actuarial range |
| Investment risk | Participant bears it | Business bears it (plan guarantees an interest credit) |
| Who funds it | Mostly the employee, plus employer pieces | The employer |
| Administration | Recordkeeper + annual testing | Adds an actuary and annual valuation |
| Best at | Flexible baseline saving at any income | Funding large deductions in fewer years |
A 401(k) is a defined contribution plan: flexible, familiar, and capped at a flat annual limit no matter how much you earn. A cash balance plan is a defined benefit pension: less flexible, more powerful, with contributions that scale with your age and income. The comparison only makes sense once you know how much income you need to shelter and for how many years.
The table below sets the two side by side; the combination design most owners end up with follows.
On this page
Calculators
| Limit | 2026 | 2025 |
|---|---|---|
| Defined benefit annual benefit limit — IRC 415(b) | $290,000 | $280,000 |
| Compensation that can be counted — IRC 401(a)(17) | $360,000 | $350,000 |
| Total additions to a defined contribution plan — IRC 415(c)Employer + employee; excludes age-based catch-up. | $72,000 | $70,000 |
| 401(k) / 403(b) employee contribution | $24,500 | $23,500 |
| Catch-up contribution (age 50+) | $8,000 | $7,500 |
Official IRS figures for 2026. Source: IRS Notice 2025-67 (IR-2025-111).
The head-to-head
The table above sets out the structural differences; the sections that follow explain when each one decides the choice.
When the 401(k) alone is the right answer
Below roughly $150,000–$200,000 of steady profit, a well-built Solo 401(k) or safe-harbor 401(k) usually wins: it shelters a meaningful share of income, costs little, and imposes no funding commitment. The same is true at any income level when profits are volatile — a cash balance plan's annual funding expectation belongs on steady cash flow.
When the pension's extra cost is justified
Once you are consistently earning well past what $72,000 can shelter, and especially past age 45, when the actuarial math accelerates, the 401(k) ceiling becomes the binding constraint. An owner of 55 maxing a 401(k) shelters $72,000; the same owner adding a cash balance plan can multiply total deductible contributions several times over, because the pension funds a promised benefit rather than obeying a flat cap.
Most owners run both, designed together
Nearly every cash balance client keeps a 401(k) alongside the pension; the deferral and a profit-sharing contribution stack on top of the actuarial amount. The design constraint is the combined-plan deduction rule that holds employer 401(k) money to 6% of pay; the S-Corp guide explains why that number appears in every well-built illustration. The result is a stack that keeps the 401(k)'s flexibility for the small piece and uses the pension for the large employer-funded layer.
Employee deferral
The owner keeps the flexible employee deferral inside the 401(k).
Employer 401(k) layer
Profit sharing stays within the combined-plan deduction rule described in this guide.
Pension layer
The cash balance plan supplies the larger employer-funded actuarial contribution.
One coordinated stack
Both plans are designed together so their separate limits and deduction rules work as intended.
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Frequently asked questions
Can I have a cash balance plan and a 401(k) at the same time?
Yes — pairing them is the standard design, and it usually produces the largest total deduction. The plans must be designed and tested together, including the 6% profit-sharing rule that protects the combined deduction.
Should I replace my 401(k) with a cash balance plan?
Almost never; you add rather than replace. The 401(k) keeps its flexibility and employee deferrals; the cash balance plan adds the large employer-funded layer on top.
Which is better if my income swings year to year?
The 401(k). A cash balance plan expects funding every year within its actuarial range, so volatile profits argue for maxing the flexible plan first and adding the pension when income stabilizes.
At what income does a cash balance plan start to make sense?
Past the point where the 401(k) ceiling binds every year. The income threshold discussed in the main cash balance guide is the usual starting point, and the calculator gives you the age-and-income-specific answer.
Sources
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This guide is educational and is not individualized tax, legal, or investment advice. Contribution limits and tax rules change annually and depend on your specific situation; figures are illustrative. Consult a qualified professional before acting.