Defined Benefit and Cash Balance Plans: Retire Rich on $200K+ Contributions
High-earning self-employed individuals can contribute far more than a Solo 401(k) allows using a defined benefit or cash balance plan. At age 55 with $400,000 net income, contributions can exceed $200,000 per year — fully deductible.
Why Defined Benefit Plans Dwarf Other Options
A Solo 401(k) caps total contributions at $70,000 in 2025. A defined benefit (DB) plan has no such hard cap — contributions are actuarially determined based on the benefit you're funding, your age, and your income. The older you are, the more you must contribute to fund a given retirement benefit — which translates directly into a larger current-year deduction.
- Age 45, $300K income: ~$80,000–$120,000 deductible contribution
- Age 50, $400K income: ~$130,000–$170,000 deductible contribution
- Age 55, $500K income: ~$170,000–$220,000 deductible contribution
- Age 60, $500K income: ~$200,000–$250,000 deductible contribution
Actual amounts require an enrolled actuary calculation — these are illustrative ranges.
Traditional DB Plan vs. Cash Balance Plan
Both are defined benefit plans under IRC §401(a), but they differ in how benefits are expressed and how participants understand their balance:
- Traditional defined benefit plan: Promises a specific monthly benefit at retirement (e.g., 70% of final salary). Less common for self-employed because the benefit promise structure is less intuitive for a one-person plan.
- Cash balance plan:Credits a hypothetical "account" each year with a pay credit (percentage of compensation) and an interest credit. Participants see a notional balance — easier to understand and communicate. This is the dominant structure for self-employed professionals and small business owners.
Both plan types require an enrolled actuary (an EA-2 credentialed actuary) to calculate required funding levels annually. This is not optional — IRS regulations mandate actuarial certification for all defined benefit plans.
Stacking: Cash Balance + Solo 401(k)
Cash balance plans can be paired with a Solo 401(k) or profit-sharing plan, dramatically increasing total tax-deferred contributions. The defined contribution plan handles the employee deferral ($23,500 in 2025); the cash balance plan handles the larger employer contribution. Total contributions can exceed $250,000 in a single year for the right profile.
Solo 401(k) employee deferral: $31,000 (age 50+ catch-up)
Cash balance contribution: ~$170,000
Total deductible contribution: ~$201,000
At 37% federal marginal rate: ~$74,000 in federal tax deferred
Who It's Best For (and Who Should Avoid It)
- Best fit: Self-employed professionals (doctors, lawyers, consultants) earning $300K+ with consistent income, no employees (or few who can be excluded), and a 5–10 year runway before retirement
- Caution: Defined benefit plans require minimum contributions each year — if income drops dramatically, you must still fund the plan or face penalties. This is a commitment, not a flexible option.
- Avoid if: You have multiple W-2 employees who would need to be covered, income is highly variable, or you are within 2 years of planned retirement (not enough runway to justify actuarial setup costs)
Annual plan administration typically costs $2,000–$5,000 (actuary + TPA fees). At contribution levels of $100,000+, this is easily justified.
IRC §401(a) (qualified plans), IRC §404(a)(1) (deduction for DB contributions), IRC §412 (minimum funding standards), IRC §415(b) (annual benefit limit — $280,000 for 2025), IRC §416 (top-heavy rules). ERISA Title I (fiduciary standards). IRS Publication 560. Form 5500 annual reporting required.
Genie models your maximum deductible contribution based on income, age, and entity type — and tells you whether a cash balance plan makes sense for your situation.
Model My Cash Balance ContributionSee how this applies to your situation.
Consult a licensed professional before implementing any tax strategy. Individual results vary.
Ask Genie →