Defined Benefit / Cash Balance Plan

How it works

A defined benefit plan promises a fixed retirement benefit, an annuity at retirement, rather than a promised contribution. The employer has to contribute whatever an enrolled actuary certifies is needed to fund that promise each year. Because the required contribution is driven by the size of the benefit rather than capped by a deferral limit, the deductible amount can reach six figures for the right owner.

A cash balance plan is the same legal structure wearing a friendlier face. It is a defined benefit plan expressed as a hypothetical individual account balance, built from a pay credit and an interest credit added each year. It runs under the same Internal Revenue Code sections, the same actuary, and the same funding rules as any other defined benefit plan. What changes is presentation: an owner can look at a cash balance statement the way they would read a 401(k) statement, which is why most owner-only plans sold today are cash balance plans rather than traditional ones.

Employer contributions to a qualified plan are deductible under Section 404(a)(1). The deduction itself is the greater of the minimum required contribution under Section 430 or the maximum deductible amount under Section 404(o), which is built from the funding target, the target normal cost, and a cushion, reduced by plan assets. None of that arithmetic is something an owner or preparer runs by hand; an enrolled actuary certifies the number every year.

The contribution is sized to fund a benefit payable at a future retirement date, and that is where age enters the picture directly. An owner with fewer years left before retirement has fewer years to fund the identical target benefit, so the annual required or allowable contribution has to be proportionally larger. That is the entire reason this strategy is built for owners in their late forties, fifties, and sixties rather than for someone decades from retirement, who could fund the same eventual benefit with a much smaller annual contribution spread across a much longer runway.

What this is worth in Florida

Florida has no individual income tax, so the value of this deduction is entirely federal. There is no separate state pension filing either, since the plan is a creature of ERISA and the Internal Revenue Code, not state law. Trust earnings inside the plan grow tax-deferred regardless of what state the owner lives in, so that half of the benefit is the same everywhere. What a Florida owner is buying with the deduction is ordinary-rate federal tax pushed into the future, and nothing more than that.

Who this applies to

The pool of employers who can legally sponsor one of these plans is wide. What narrows it is practicality, and durable income is the real gate here, not entity type.

• Any employer with earned income can sponsor one. A sole proprietor filing on Schedule C, a partnership, an S corporation, and a C corporation all qualify. What makes the plan worth adopting is strong, consistent net business income able to support a multi-year funding commitment, not the entity on the letterhead.
• The owner needs compensation or earned income to support the target benefit. A self-employed owner's compensation for this purpose is net self-employment earnings, reduced by half of self-employment tax and by the plan contribution itself. An S corporation owner's compensation is W-2 wages instead. The benefit an actuary can design toward is only ever as large as the pay that supports it, which is why how an entity is structured matters before an actuary gets involved.
• The plan has to satisfy Section 401(a) qualification. Exclusive benefit, vesting, and nondiscrimination rules apply, and qualification is what unlocks both the Section 404 deduction and tax-deferred growth inside the trust.
• Coverage and minimum participation gate owner-only designs. Section 410(b) coverage testing and the defined-benefit-specific Section 401(a)(26) rule, which requires a plan to benefit at least the lesser of fifty employees or the greater of forty percent of all employees or two employees, decide whether a plan can stay owner-only. That two-employee floor is worth reading twice, because Treasury Regulation 1.401(a)(26)-2(a) still carries the pre-1996 formulation without it. The statute was amended and the regulation was never conformed, so checking this against the CFR alone gives the wrong answer at the smallest headcounts. A true solo owner with no non-owner employees clears both easily. Once rank-and-file staff exist, the actuary has to design in meaningful staff benefits to pass nondiscrimination, and that is where cost and complexity climb fast.
• This is not a fit for erratic income. Minimum funding under Sections 412 and 430 becomes mandatory the moment a benefit is promised. A single strong year does not, by itself, make this the right plan if the years after it are uncertain.

An owner who has not yet run into the Section 415(c) ceiling on a profit-sharing plan or a solo 401(k) usually does not need this yet. I walk through that ground first in solo 401(k) vs. SEP-IRA, and a defined benefit or cash balance plan is worth a conversation once that ceiling is the real constraint, not before.

What it requires

This plan cannot be run off a brokerage template. It requires an enrolled actuary and a third-party administrator from day one: the actuary designs the benefit formula, certifies the funding each year, and signs the actuarial schedule the annual filing depends on. Actuarial and administration fees are a real, ongoing cost, and they rise once staff benefits enter the design.

• A plan document adopted on time. Section 401(b)(2), as amended by the SECURE Act, lets a plan adopted by the due date of the employer's return, including extensions, be treated as in effect on the last day of the tax year the deduction is claimed for. That means a plan can be signed well into the following year, right up to the extended return due date, and still support that year's deduction.
• A benefit capped at Section 415(b). The maximum annual benefit a defined benefit plan may pay is a dollar limit adjusted for inflation every year. It is reduced actuarially for benefits that start before age sixty-two, and for participants with fewer than ten years of plan participation. A start after age sixty-five moves the other way: Section 415(b)(2)(D) increases the limit so it stays actuarially equivalent to the age-sixty-five benefit, which matters to the late-career owner this design is usually built for. The actuary funds toward this ceiling; nothing about the design can fund past it.
• Coordination with a paired 401(k), if there is one. When the same employer maintains both a defined benefit plan and a defined contribution plan covering overlapping people, Section 404(a)(7) can cap the combined deduction. If the employer's defined contribution contributions, other than elective deferrals, stay at or under six percent of aggregate compensation, the combined limit does not apply at all, which is why a common design holds profit-sharing at exactly that level on top of a full defined benefit contribution. Elective deferrals under a 401(k) never count against this limit at all, so an owner can still defer the full amount the tax code allows on top of everything else.
• An annual filing tied to the actuary's signature. Form 5500, or Form 5500-EZ once a one-participant plan's assets cross the filing threshold, is due every year with the actuarial schedule signed by the enrolled actuary. The signature on that schedule is the linchpin of the whole filing.

The two funding clocks

Two separate deadlines govern this plan, and they are easy to conflate. For the Section 404 deduction, a contribution is treated as made on the last day of the prior tax year if it is actually paid by the return due date, including extensions, under Section 404(a)(6). For the Section 412 and 430 minimum funding requirement, the statutory deadline is eight and a half months after the plan year ends, under Section 430(j), regardless of when the employer's tax return is due. The two dates do not automatically match, and whichever one is earlier controls when the money has to move. Treating the later, deduction-driven deadline as the only one that matters is a common way to miss the earlier, mandatory funding deadline.

What you need to document

The file behind this plan has to carry as much weight as the actuarial math, because nearly every failure mode below is a documentation failure before it is anything else.

The signed plan document and every amendment

Dated, because the Section 401(b)(2) adoption deadline is measured against the date the document was actually executed, not the date the plan year it covers began.

The annual actuarial valuation and the signed actuarial schedule

The certification the entire deduction rests on. Without it, there is no basis for the contribution amount claimed on the return.

Board or owner resolutions authorizing the contribution

A contemporaneous record that the employer decided to fund the plan for the year, separate from the actuary's calculation of the amount.

Proof of timely funding against both deadlines

Bank or custodial records tied specifically to the Section 404(a)(6) deduction deadline and the Section 430(j) minimum funding deadline, since meeting one does not prove the other was met.

Compensation substantiation

W-2s for an S corporation owner, or the net self-employment earnings computation for a sole proprietor or partner, showing that the compensation the benefit is built on actually exists.

Coverage and nondiscrimination testing workpapers

Once any non-owner employee is on the payroll, the Section 401(a)(26) and Section 410(b) testing that shows the plan still qualifies has to be run and kept every year, not just at adoption.

Where it goes wrong

A standard, actuarially funded defined benefit or cash balance plan is a mainstream, IRS-sanctioned qualified plan. It carries no disclosure obligation and no listed-transaction posture for ordinary use. What goes wrong is almost never a characterization argument about legitimacy. It is operational: a deadline missed, a number built on compensation that will not hold up, or a fact about the business that changed without the plan changing with it.

The mandatory contribution most owners don't expect

Once a benefit is promised, Sections 412 and 430 make the minimum required contribution mandatory, even in a year when the business would rather not fund it. A missed minimum required contribution is a funding deficiency, and it carries an excise tax under Section 4971 that starts at ten percent and escalates toward one hundred percent if the shortfall is not corrected. This is the single biggest practical risk in the strategy, and it is why the plan is recommended only to owners with cash flow durable enough to survive a bad year without skipping the contribution.

Where the exam actually finds it

• Funding the benefit on compensation that is not real. Inflated or unsubstantiated owner pay does not just risk the compensation figure. The benefit and the deduction both collapse to whatever the compensation can actually support.
• Exceeding the Section 415(b) ceiling. A benefit designed above the limit is a plan qualification defect, and contributions that exceed what is deductible can trigger a ten percent excise tax under Section 4972.
• Skipping nondiscrimination testing once staff exist. The classic version of this failure is a plan designed to be rich for the owner without funding adequate benefits for staff who now have to be covered under Section 401(a)(26) and Section 410(b). Disqualification does not just cost this year's deduction. It can put the entire trust into income and unwind deductions already taken in prior years.
• Late or missing Form 5500 and the actuarial schedule. Penalties accrue per day the filing is late, and the actuary's signature on that schedule is the piece regulators look for first.
• Adopting or funding after the deadline that actually controls. Relying on the extended Section 401(b)(2) adoption window while missing the separate Section 404(a)(6) deduction deadline, or missing the Section 430(j) minimum funding deadline entirely, is a scheduling mistake with a real tax consequence.

A situation where this comes up

The version I see most often is a Florida S corporation owner well into a career, with income that has stayed strong for years, who has already funded a solo 401(k) and a profit-sharing contribution to the point where neither is doing much more for the current tax bill. Nothing about how the business operates has to change to add a cash balance plan on top. What changes is the paperwork and the commitment: an actuary designs a benefit, a contribution becomes due every year regardless of how the year turns out, and profit-sharing stays at the level that keeps the combined deduction limit from applying.

The situation that worries me is the owner who wants the deduction for one exceptional year without planning for the ordinary year that follows it. The contribution is not discretionary once promised, and an owner who sizes a plan for a peak year is still on the hook for the minimum required contribution in a leaner one, with an excise tax waiting if it is missed. The other pattern worth naming is the owner who takes on staff after the plan is already running and never circles back to the actuary to ask whether the design still passes nondiscrimination testing. The plan does not send a notice when the facts underneath it change, and someone has to go looking for that rather than waiting for it to surface at the worst possible time.