You maxed out your Solo 401(k). You’re putting in $72,000 this year, maybe $80,000 with the catch-up. That’s real money — but if your business is generating $300,000 or more in profit, you’re still sitting on a large taxable income and you don’t have to be.

A cash balance plan changes that math entirely. Most business owners have never set one up because their accountant never brought it up. That’s the only reason.

What a Cash Balance Plan Actually Is

A cash balance plan is a type of defined benefit plan — the IRS-blessed cousin of the old corporate pension. Where a 401(k) defines what you put in, a cash balance plan defines what you get out. That distinction is what allows the contribution limits to be so much higher.

For 2026, the annual benefit limit for a defined benefit plan is $290,000. The IRS caps compensation at $360,000 for calculation purposes. What that translates to in annual contributions depends on your age — the older you are, the more you can put in each year, because there’s less time for the money to compound before you’d need to start drawing it down.

A 45-year-old owner might contribute $80,000–$120,000. A 55-year-old could be looking at $150,000–$250,000. A 62-year-old nearing retirement could hit $300,000 or more. These numbers require an actuary to certify — you can’t just pick a figure — but that’s a feature, not a bug. The actuary is doing the math that keeps the plan IRS-compliant.

Every dollar that goes into the plan is a tax deduction this year.

The Stack: Cash Balance on Top of a 401(k)

Here’s where it gets interesting. You don’t have to choose. You can run a cash balance plan and a 401(k) at the same time.

The catch is that when you pair the two, the profit-sharing portion of your 401(k) drops significantly — typically to around 6% of compensation. But your employee elective deferral ($24,500 in 2026, plus up to $8,000 catch-up if you’re 50 or older, or $11,250 if you’re between 60 and 63) stays fully intact and deductible.

Run the math on a 55-year-old owner with $400,000 in net profit:

  • Solo 401(k) employee deferral: $32,500
  • Employer profit-sharing (limited when combined with DB): ~$21,600
  • Cash balance contribution: ~$175,000
  • Total sheltered: approximately $229,000

At a 35–37% effective rate, that’s roughly $80,000–$85,000 in deferred taxes — not eliminated, but pushed into the future, potentially into years when your income (and your rate) is lower.

Already have a Solo 401(k) or SEP-IRA and wondering if a cash balance plan stacks on top? Schedule a call and we'll map out what the numbers look like for your specific income level and age.

Who This Makes Sense For

A cash balance plan is not a fit for everyone. The setup and annual actuary fees run $1,500–$3,000 per year. If you’re contributing $50,000 to the plan, the cost-benefit calculus works. If you’re contributing $20,000, it probably doesn’t.

This is a strategy for business owners who are:

  • Generating $250,000 or more in net profit
  • In their 40s, 50s, or 60s and want to accelerate retirement savings
  • Already maxed out their 401(k) and looking for more room
  • Running a business with predictable income — because a defined benefit plan requires contributions every year, in good years and slow ones

That last point matters. Once you establish a cash balance plan, you’re committed to funding it annually. If your income is highly variable, you need to size the plan conservatively and leave room. An actuary will help you build that flexibility in.

The NY Angle

If you’re a New York-based business owner running an S-corp or a pass-through entity, cash balance contributions reduce your ordinary income — which flows directly to your NY return. Every dollar you shelter at the federal level also reduces your New York State taxable income. The NY top marginal rate runs just over 10% for high earners. That makes the state-level savings real money too.

One Timing Rule That Catches People

The plan must be established — meaning the legal document signed and in place — by December 31 of the year you want the deduction. You cannot go back and set up a 2026 cash balance plan on April 14, 2027, the way you can with a SEP-IRA.

If you’re reading this in the spring and thinking about your 2026 tax picture, you still have time. If you’re reading this in November, it needs to move fast.

If your 2026 income is on track to be strong, the window to set this up and get the deduction is open — but it won't stay open past December 31. Let's talk before then.

Where to Go From Here

If you’ve already maxed out a Solo 401(k) or you’re comparing it to a SEP-IRA or SIMPLE IRA, a cash balance plan is the next logical layer. Most owners don’t know it exists because it takes more coordination to set up. But for the right income profile, the tax savings are substantial — and completely legal.

This is one of those things you want to plan for, not scramble for in March.

This post is for general educational purposes and does not constitute tax advice. Cash balance plan contribution limits are individually calculated by a credentialed actuary and depend on your specific age, income, and plan design. Consult a qualified tax professional before establishing any retirement plan.