Cash Balance & Defined Benefit Plan Calculator (2026)
A cash balance or defined benefit plan can add $90,000–$330,000 of additional annual tax-deductible contributions on top of your Solo 401(k) — the exact amount depends on your age. Enter your details below to see your estimated 2026 maximum and how much federal tax you would defer.
How cash balance and defined benefit contributions are calculated
Unlike a 401(k) — capped by the IRC §415(c) annual additions limit ($72,000 in 2026) — a cash balance or defined benefit plan is governed by IRC §415(b), which limits the maximum annual benefit at retirement to $290,000 per year for 2026.1
An enrolled actuary works backward from that $290,000 target: how much must be contributed annually, at a conservative assumed investment return (typically 4–6%), to fully fund that benefit by your retirement date? Because older owners have fewer years to accumulate the same target balance, their required — and maximum — annual contributions are much larger.
This is the mathematical reason a 60-year-old can shelter three times what a 40-year-old can: at 60, you need to fund the same $290,000/yr benefit in 5 years instead of 25.
2026 estimated maximums by age
Estimates below assume an owner-only plan designed to fund the §415(b) maximum, with income at or above $360,000 (the §401(a)(17) compensation cap).3 Actual contributions require actuarial certification.
| Age | CB / DB plan approx. max | + Solo 401(k) | Combined total | Tax saved at 37% |
|---|---|---|---|---|
| 40 | ~$90,000 | $72,000 | ~$162,000 | ~$59,940 |
| 45 | ~$115,000 | $72,000 | ~$187,000 | ~$69,190 |
| 50 | ~$155,000 | $80,000 | ~$235,000 | ~$86,950 |
| 55 | ~$200,000 | $80,000 | ~$280,000 | ~$103,600 |
| 60 | ~$265,000 | $83,250 | ~$348,250 | ~$128,853 |
| 65 | ~$330,000 | $80,000 | ~$410,000 | ~$151,700 |
Solo 401(k) figures: $72,000 under age 50; $80,000 ages 50–59/64+; $83,250 ages 60–63 (SECURE 2.0 super catch-up per IRS Notice 2025-67). CB plan amounts are approximations from actuarial modeling — verified against Emparion 2026 CB Contribution Table and IRS §415(b) $290,000 limit.4
Who benefits most from a cash balance or defined benefit plan
- Age 45+. At 60 you can shelter three times what a 40-year-old can — because the actuarial clock is ticking faster. Owners under 40 still benefit, but the advantage over a Solo 401(k) is smaller.
- Income consistently above $300,000. You need enough net income to fund both the Solo 401(k) and the cash balance plan without straining cash flow. Minimum funding requirements are legally binding — you cannot skip a year.
- Few or no employees. If you have employees over age 21 with 1+ year of service, they generally must be covered. Owner-only and owner+spouse businesses capture the most value. Adding key employees is possible but adds cost.
- 5+ year income horizon. Setup and annual actuary/TPA costs run $2,000–$3,500/year. A plan you maintain for 3 years produces far more tax savings than one you terminate after 18 months.
Cash balance vs. traditional defined benefit plan
Both are defined benefit plans governed by IRC §415(b) — the annual benefit limit and PBGC premium rules are identical. The key difference is presentation:
- Cash balance plan: Each participant sees a hypothetical account credited annually with pay credits and a guaranteed interest rate (often 4–6%). At separation, the balance rolls to an IRA. More intuitive for employees; preferred by most modern plan administrators.
- Traditional defined benefit plan: Benefit is a formula-based monthly annuity ("2% × years of service × final average salary"). No visible account balance. Slightly higher maximum contributions in some actuarial scenarios for older owners who want pure pension income.
For most private business owners, a cash balance plan is the default choice — cleaner IRA portability, more intuitive for employees, and easier to explain at a business sale. A traditional DB plan makes sense only if you specifically want annuity-form retirement income or your actuary finds a numerical edge in a specific interest-rate environment.
Break-even on setup costs
Cash balance plan setup costs roughly $1,500–$2,500 to establish plus $1,500–$2,500 per year in ongoing actuary and TPA fees. At a 37% marginal rate, you need about $8,000–$14,000 in additional tax-deferred contributions (beyond Solo 401(k)) to break even on the annual cost.
A 45-year-old adding ~$115,000 through a cash balance plan generates approximately $42,550 in annual federal tax savings from the plan alone. The break-even calculation is not close at any age above 40 with income over $250,000.
Related calculators and guides
- Solo 401(k) vs SEP-IRA vs Cash Balance — side-by-side comparison calculator
- Cash Balance Plans for Business Owners: The 2026 Guide
- Traditional Defined Benefit Plans: When DB Beats Cash Balance
- Solo 401(k) Contribution Limits and Rules for 2026
- All Retirement Plans for Business Owners: Comparison Hub
- Match with a business-owner retirement planning specialist
Model your exact plan with an enrolled actuary
Contribution estimates shown here are approximations based on IRS limits and typical actuarial assumptions. An enrolled actuary working with a fee-only financial advisor who specializes in business-owner planning will determine your certified annual contribution, design the plan around your employees (if any), and coordinate it with your Solo 401(k), S-corp salary structure, and §199A QBI deduction to maximize after-tax benefit. Free match, no obligation.
Frequently asked questions
What is a defined benefit plan contribution calculator?
A defined benefit plan contribution calculator — sometimes called a cash balance plan calculator — estimates the maximum annual tax-deductible contribution available to a business owner based on age, income, and entity type. The calculation works backward from the IRC §415(b) annual benefit limit ($290,000 in 2026): an enrolled actuary determines how much must be contributed annually, at a conservative assumed interest rate, to fund that target benefit by retirement age. Because older owners have fewer years to accumulate the same benefit, required annual contributions are larger at older ages — rising from ~$90,000 at 40 to ~$330,000 at 65.
What is the maximum cash balance plan contribution for 2026?
Cash balance plan contribution maximums for 2026 range from approximately $90,000 at age 40 to $330,000 at age 65. These are based on IRC §415(b), which limits the annual retirement benefit to $290,000 for 2026 (IRS Notice 2025-67). The actual maximum must be certified by an enrolled actuary each year — the figures in this calculator are approximations from actuarial modeling, typically accurate within ±15–20% of the certified amount.
How is the cash balance plan contribution calculated by age?
Cash balance plan contributions are actuarially determined by how much must be set aside annually to fund the §415(b) maximum benefit ($290,000/year) by retirement. The key variable is time: a 60-year-old has roughly 5 years to accumulate the required balance, while a 40-year-old has 25 years. With a conservative 4–6% assumed investment return, the older owner must contribute roughly three times more per year — which is why contributions rise steeply from ~$90,000 at 40 to ~$265,000 at 60.
Can I contribute to both a cash balance plan and a Solo 401(k)?
Yes. Since EGTRRA 2001 repealed IRC §415(e), business owners can maintain both a cash balance (or defined benefit) plan and a Solo 401(k) simultaneously with independent limits. A 55-year-old owner earning $600K could contribute ~$200,000 to a cash balance plan plus $80,000 to a Solo 401(k) for a combined $280,000 annually — approximately $103,600 in federal tax savings at 37%. The Solo 401(k) covers the §415(c) defined contribution limit; the cash balance plan layers on top under the separate §415(b) benefit limit.
What is the difference between a cash balance plan and a traditional defined benefit plan?
Both are defined benefit plans governed by IRC §415(b) with identical annual benefit limits ($290,000 in 2026) and PBGC premium rules. A cash balance plan shows each participant a hypothetical account credited annually with pay credits and a guaranteed interest rate (typically 4–6%), which rolls to an IRA at separation. A traditional defined benefit plan pays a formula-based monthly annuity with no visible account balance. For most private business owners, the cash balance plan is preferred for its simpler IRA portability and easier participant communication.
Who benefits most from a cash balance or defined benefit plan?
A cash balance or defined benefit plan typically makes sense for owners who are age 45 or older, have consistent income above $300,000 per year, have few or no W-2 employees, and plan to maintain the plan for at least 5 years. Annual actuary and TPA fees run $1,500–$2,500 per year; at 37%, a 45-year-old contributing $115,000 annually saves approximately $42,550 in federal taxes — roughly 14× the ongoing fee. Owners under 40 still benefit from the contribution room, but the tax savings advantage over a Solo 401(k) alone is smaller.
- IRC §415(b)(1)(A) — 2026 annual benefit limit $290,000. IRS: Defined Benefit Plan Benefit Limits. Confirmed via IRS Notice 2025-67 (October 2025).
- IRC §415(c) — 2026 defined contribution annual additions limit $72,000, plus catch-up contributions per SECURE 2.0. IRS Notice 2025-67.
- IRC §401(a)(17) — 2026 maximum compensation limit $360,000. IRS Notice 2025-67.
- Cash balance contribution estimates by age. Emparion: 2026 Cash Balance Plan Contribution Table. Estimates verified against §415(b) $290,000 benefit limit and independent actuarial sources.
Tax values verified as of June 2026 against IRS Notice 2025-67 and IRC §415.