What is the maximum contribution to a defined benefit plan?

The maximum is determined actuarially based on your age, income, and the plan's target benefit. For a self-employed person age 55+, annual deductible contributions can exceed $250,000. The 2025 maximum annual benefit at retirement is $280,000, and the contribution needed to fund that benefit is calculated by an actuary.

Can I have a defined benefit plan and a Solo 401(k) at the same time?

Yes. You can stack a Solo 401(k) (up to $69,000 in 2025, or $76,500 with catch-up if 50+) on top of a defined benefit plan. Combined, a high earner over 50 could defer $300,000+ per year in pre-tax retirement contributions.

What are the risks of a defined benefit plan?

The primary risk is the mandatory funding requirement. Once you establish the plan, you must make the required contributions for 3-5 years, regardless of business income fluctuations. Setup costs ($2,000-$5,000) and annual actuarial fees ($2,000+) also apply. This is best suited for professionals with stable, high income.

retirement Audience: high income 3 min read

Defined Benefit Plans: Supercharging Self-Employed Retirement

Making $500k+? A 401(k) might be too small. Defined Benefit Plans (Cash Balance Plans) allow legal tax deductions of $200k+ per year.

Last updated on February 18, 2026

The Solo 401(k) limits you to roughly $69,000 in 2025 (plus catch-up contributions for those 50+, bringing the total to $76,500). If you are still maxing out your 401(k) cadence, start with direct 401(k) contribution strategies. For a consultant entering their peak earning years (age 50+) earning $600,000, that might not be enough to dodge the 37% federal + state tax bracket. Enter the Defined Benefit (“Cash Balance”) Plan.

Key Takeaways

Concept: Instead of defining the *contribution* (401k), you define the *benefit* (Pension).
Limits: Actuarially determined. Can be $150k - $300k+ annually depending on age.
Commitment: Unlike a 401(k), contributions are mandatory for ~3-5 years. You need steady cash flow.
Combo: You can stack a Solo 401(k) on top of it.

Example: The Consultant

Profile: Age 55. Income $800k.
401(k) Only: Deduct $76,500. Taxable Income: $723,500.
Cash Balance Plan: Deduct $250,000. Taxable Income: $473,500.
Tax Savings: ~40% of the difference ($173,500) = $69,000+ saved per year.

The Catch

It is expensive to set up ($2k - $5k) and maintain ($2k/yr). You need an actuary. But if you are writing a check for $69k less to the IRS, the $2k fee is a rounding error.

How It Compares to Other Retirement Vehicles

Before jumping to a defined benefit plan, make sure you have already maximized simpler options. The Solo 401(k) vs. SEP IRA comparison covers the foundational retirement accounts for the self-employed. A defined benefit plan is the next tier up --- for when those accounts are not large enough.

If you are evaluating broader self-employed tax strategies, consider whether an S-Corp election also makes sense. The payroll tax savings from S-Corp structure can complement the income tax savings from a defined benefit plan. Pair that with a Solo 401(k) vs. SEP IRA comparison to pick the right retirement stack.

For a comprehensive view of how all these pieces fit together for earners above $500k, our tax strategies for high income earners guide maps out the full playbook.

Target Audience: Law partners, Consultants, Specialist Doctors, profitable Solopreneurs over age 45.

How sharper.tax Helps

sharper.tax analyzes your uploaded return and identifies whether your retirement contributions are maximized relative to your income. If you are a high earner with room to defer significantly more, we flag the opportunity and estimate the tax savings from adding a defined benefit plan. Sophisticated tax planning used to require a high-end CPA --- we make it available for free.

Sources

The information above is educational and not tax advice.