$285,000 off one return, same law as yours

Two business owners. Same age. Same income. Same year. One deducts $95,000. The other deducts $285,000.

Same law. Same IRS. Same tax code.

The difference is the actuary.

You know the 401(k). Congress sets a ceiling. In 2025, that number is $23,500. If you're over 50, you get a catch-up bump. With profit sharing, $70,000 total. Your CPA looks it up. Done.

There's nothing to design. It's a fixed box. You fill it or you don't.

Most CPAs stop here. Not because they're lazy. Because the fixed box is the only box they stock.

A Cash Balance Plan is not a fixed box. It's a defined benefit plan. A pension, basically. And the deduction isn't a number Congress picked.

It's a number your actuary calculates. Based on how much money needs to go in right now to hit a promised future benefit.

Read that again. The deduction is tied to an actuarial calculation. Your actuary's calculation. The one you hired.

The width of your tax vault depends on who builds it.

Your actuary controls three big levers.

The interest crediting rate. This is the growth rate the plan promises on your account balance. Set it low, say 4%. The money won't grow much on its own. So you need to stuff more cash in today to hit the future target. Bigger contribution. Bigger deduction.

The segment rates. The IRS publishes these monthly. They measure what a future promise costs in today's dollars. Lower rate means the promise costs more today. More cost today means a bigger contribution. Your actuary picks the measurement month. Some months run lower than others. That's the lever.

The projected retirement age. If you're 58 and the plan says you retire at 62, that's a four-year runway. Four years to fund a lifetime benefit. The contribution has to be enormous. The deduction follows.

This is why the strategy detonates for owners between 55 and 65. Short runway. Big deposits. The math demands it.

Here's the stacking trick. The Cash Balance Plan sits on top of the 401(k). They're separate plans. Separate limits.

The 401(k) fills one bucket. The actuary builds a second bucket and decides how big it is.

A 58-year-old owner earning $500,000? The 401(k) bucket holds $70,000. The actuary pours $215,000 into the second bucket. Combined: $285,000 off taxable income. Two buckets. One tax bill.

Now you're thinking: the IRS won't let me stuff 90% of the money into my own account. Right?

Almost right. IRC §401(a)(4) says the plan can't favor the boss. But there's a thing called cross-testing. The actuary converts the defined benefit formula into equivalent rates. Compares them against what the younger, lower-paid employees get.

The owner is oldest. Highest-paid. The age-weighted math tilts the whole table.

Result: 80 to 90% of total plan contributions flow to the owner. Legal. Because the math checks out.

I mean. That's the anchor detail. That's the thing you'll say out loud at dinner.

Look. This isn't free money. Once the plan exists, contributions are mandatory. Not optional.

Here's the statute:

Translation: you promised the money. Now you owe the money. Every year.

Miss a contribution? Excise tax of 10% on the shortfall under IRC §4971. Don't fix it? That climbs to 100%.

Bad year? Tough. You still owe the plan. Or you terminate it. Which means every employee keeps their money. All of it. Right then. Plus payouts. The promoters skip this part. We won't.

So why hasn't your CPA mentioned this?

Because a Cash Balance Plan requires an enrolled actuary, a retirement law attorney, and a third-party administrator. Your CPA files what exists. This requires building something that doesn't exist yet.

The gatekeeping isn't legal. It's organizational. The plan must be designed, adopted, and funded before December 31. Your CPA doesn't coordinate with actuaries. So the second bucket never gets built.

Sure.

Same two business owners. Same law. Same IRS.

One hired someone to file. The other hired someone to build.

The deduction was never a number. It was a blueprint. And the architect was the actuary.

The government wrote the rules. We're just reading the fine print.