As an ophthalmology practice owner, should I add a cash balance plan to my 401(k)?

By Ryan Inman
Published Oct 27, 2026 · Updated Nov 11, 2026

The short answer

When three facts hold at once: the 401(k) with profit sharing is already filled to the annual additions limit, the income above it is large, and the practice's earnings are durable enough to carry a required annual contribution for years. A cash balance plan is how owners shelter six figures beyond the 401(k) limits, because it is a defined benefit plan wearing a statement friendly face: each participant carries a hypothetical account, credited yearly with a pay credit and an interest credit, while the plan's actual obligation is a promised benefit the practice must fund.

The 2026 annual additions limit for the 401(k) side is $72,000 (Internal Revenue Service, Notice 2025-67), deferrals and employer contributions combined. A cash balance plan sits outside that limit under its own defined benefit rules, and for an established owner in the peak earning years the combined shelter can run well past double the 401(k) alone, with the exact amount set by the plan's design and the owner's age, since older owners have fewer years to fund the promised benefit and may therefore contribute more per year.

Part of the ophthalmology hub.

What the plan asks of the practice

The contribution is not optional in a lean year, and that single fact is the price of the shelter. A 401(k) profit sharing contribution can shrink when the practice has a bad year. A cash balance plan's funding obligation follows its formula, with limited flexibility, and a practice whose earnings swing with surgery center distributions or a partner's departure can find the plan's promise competing with the practice's cash at the worst moment. The design therefore runs from the practice's durable earnings, not its best year: the credit is set at a level the practice can fund in an ordinary bad year, and the good years' excess has other lanes. Staff costs ride along. A plan that shelters the owners must also credit the employees under the nondiscrimination structure, and the honest comparison includes those contributions as part of the plan's cost, which in a staff heavy ophthalmology practice, technicians, surgical coordinators, billing, is a real line and occasionally the deciding one.

The plan also has a lifespan. It is adopted for a run of years, commonly the owner's peak decade, and it is terminated properly at retirement or at the practice's sale, with its assets rolled into IRAs at the end. A private equity sale in the middle of the run is one of the events the plan's design has to survive, which is why the owner contemplating both reads the sale question and this one together, with the same advisers, before either is signed.

The solo and small practice version

The ophthalmologist who owns alone, or with a spouse, runs the cleanest version: a solo 401(k) filled to its limits, the employer side at 25 percent of compensation, about 20 percent of net self employment earnings on the contractor form, and a cash balance plan layered over it with no staff coverage problem to price. This is the structure behind many of the specialty's strongest established balance sheets, and it is the natural endpoint of the contractor and solo paths this hub teaches from the first contract. Diane, the featured household, holds a solo 401(k) among the couple's accounts, beside two 401(a) plans, a 403(b), a governmental 457(b), and two backdoor Roth IRAs, a reminder that established households accumulate plan types across a career and the funding order, not the count of accounts, is what keeps them coherent.

The main points

Add the cash balance plan when the 401(k) side is full at $72,000, the income above it is large, and the practice's earnings are durable across ordinary bad years.
The shelter can run well past double the 401(k) alone for peak career owners, with the exact amount set by actuarial design, age, and the promised benefit.
The funding obligation is the price: it does not shrink politely in a lean year, and staff coverage costs belong in the comparison from the start.
A solo owner runs the cleanest version, and a likely near term sale is a reason to wait, because the plan must survive the transaction or be unwound inside it.

Related questions

How much more can the cash balance plan shelter?

The amount is a design output, not a table figure: it depends on the owner's age, the benefit promised, and the years to retirement, and it is computed by the plan's actuary when the plan is designed. The honest range statement is that peak career owners commonly shelter well into six figures a year across the combined plans, several times the $72,000 the 401(k) side allows alone, and that the tax saved at an owner's marginal rate on that shelter is the return the staff costs and the funding obligation have to clear. Any adviser quoting an exact number before seeing the practice's census and earnings has skipped the design step.

What if the practice income is mostly surgery center distributions?

Distributions from the facility entity are investment income, not the practice compensation the plans are funded from, and the plan design runs on the practice's own earnings and payroll. An owner whose income has shifted heavily toward distributions needs the entity and compensation structure reviewed before assuming the plan's shelter is available at the same size, because the contribution math follows the compensation the documents define. This is a design question for the plan's professionals, asked in the year before adoption, not the month of it.

When is the answer plainly no?

When the 401(k) is not yet full, when the practice's earnings are young or volatile, when a sale is likely inside a few years, or when the staff coverage cost consumes the owners' tax saving. Each of those is common, and none is a failure: the plan is a peak years instrument, and adopting it outside the peak buys the obligation without the shelter that justifies it. The order stands: fill the 401(k) side first, prove the earnings durable, then design the plan.

Sources

Internal Revenue Service, Notice 2025-67. The 2026 annual additions limit of $72,000 and elective deferral limit of $24,500. Accessed October 2026.
Internal Revenue Service, cash balance plan guidance. The defined benefit structure, hypothetical accounts, and funding obligations. Accessed October 2026.
Internal Revenue Service, solo 401(k) guidance. The employer side at 25 percent of compensation, about 20 percent of net self employment earnings. Accessed October 2026.