For highly profitable consultants, software architects, and solo agency owners earning $250,000 to $500,000+ per year, standard Solo 401(k) contribution caps ($69,000 in 2024) may not provide enough tax relief. A Solo Defined Benefit / Cash Balance Plan allows you to shelter $100,000 to $250,000+ annually in pre-tax contributions.
How Defined Benefit Plans Differ from 401(k)s
A 401(k) is a defined contribution plan with a fixed annual cap. A Defined Benefit plan is an actuarially calculated pension plan where the contribution limit is determined by your age and target retirement benefit. Older freelancers (ages 45–60+) can contribute the largest amounts.
Stacking: Combining a Cash Balance Plan with a Solo 401(k)
You can legally pair a Defined Benefit plan with a Solo 401(k). For example, a 52-year-old solo consultant netting $350,000 could contribute $160,000 to a cash balance plan PLUS $23,000 in employee deferrals and profit-sharing into a Solo 401(k), slashing their taxable income by nearly $200,000 in a single year.
Important Considerations
Defined benefit plans require annual actuarial administration fees ($1,500–$2,500) and commit you to recurring mandatory contributions for a minimum 3-to-5 year period. They are best suited for solopreneurs with steady, predictable high cash flow.