What retirement plan fits an OB/GYN group whose partners earn unevenly?

A layered one: a 401(k) with profit sharing as the base every partner shares, and a cash balance plan on top for the partners the defined contribution ceiling constrains. The 401(k) alone treats every partner identically, and this group is not identical. The base plan allows $24,500 of elective deferrals and $72,000 of total annual additions per person for 2026, which fits a group of near equals and starves a group where a senior partner needs to shelter far more than a new partner does. A cash balance plan, a defined benefit plan whose promised benefit is stated as a hypothetical account balance, funds that benefit over the years remaining to retirement, so the required contributions for the older and higher earning partners are far larger, matching the shape of an OB/GYN group spread.

Part of the OB/GYN hub.

Why the spread breaks the simple plan

OB/GYN groups can spread wide. A new partner is building a panel against the specialty average of about $390,000, with Doximity reporting average total compensation of $420,859. A senior partner carries a full book and twenty years of referrals. A third partner is phasing toward gynecology only at reduced time by design. One plan has to serve the physician who needs liquidity and decades of compounding, the physician who needs maximum shelter in the best earning years of a career, and the physician whose income is stepping down on purpose. Lisa, the established OB/GYN in the case series, sits in the middle of that spread: about $370,000 of income, a 401(k) funded to the match and the rest left as leftovers. Her stage shows what the base plan alone does with a good income and no design behind it. Profit sharing formulas can weight contributions by pay, and designs can tilt them toward older partners inside the defined contribution limits. They cannot raise the $72,000 ceiling itself. When the senior partners' tax problem is larger than the ceiling, the group is no longer choosing between formulas. It is choosing whether to add the defined benefit layer.

How the cash balance layer fits the spread

The mechanics do the fitting. Each participant's benefit is expressed as a hypothetical account, credited annually with pay credits set by the plan formula and interest credits at the plan's stated rate. The employer funds the plan with actuarially determined contributions, and the employer bears the investment risk, because what is owed at retirement is the promised balance rather than a portfolio result. A partner fifteen years from retirement funds the promised balance across fifteen years. A partner seven years out funds a comparable benefit across seven, which requires much larger annual contributions, the group's tax deductible cost of the plan. Paired with the 401(k) profit sharing plan, the stack reads in layers: deferrals and profit sharing to the ceiling for all, then cash balance credits sized by age and pay for the partners the ceiling constrains. No dollar cap is stated for the cash balance layer because none works like the defined contribution ceiling does; the room comes from the funding mathematics of a benefit promised at retirement age. At exit the benefit can generally be rolled into an IRA as a lump sum or taken as an annuity under the plan terms.

What the layer costs the group

The fit is not free, and the honest costs belong in the decision. Contributions are required once the benefit is promised, in lean years as well as fat ones, and OB/GYN lean years arrive with premium spikes and lost contracts, so a group whose cash flow swings hard should size the promised benefits conservatively or not adopt the layer at all. The plan must satisfy nondiscrimination and coverage rules across the whole practice, which means staff and younger partners are inside the design and its cost. Actuarial certification, administration, and benefits counsel are recurring costs. Partners phasing down need the formula read carefully, because reduced time and reduced pay interact with pay credits in ways that should be designed rather than discovered. None of these costs argues against the layer for a group with a wide and stable spread. They argue for adopting it with an actuary and benefits counsel who design physician group plans routinely.

Follow up questions

Should a group adopt the layer if only one partner wants it?

Almost never on that basis alone. A cash balance plan is a group funding promise, and a design built to please one senior partner loads the whole practice with required contributions and coverage obligations for partners who did not ask for the shelter. The groups where the layer works share two traits: several partners gain from it, and the partners say their horizons out loud before the design study starts. If only one partner benefits and that partner is near exit, price the honest alternatives for that partner first.

Where does this sit in the funding order for an individual partner?

After the waterfall basics, not before them. The individual order still runs: capture the full employer match, hold reserves, clear credit cards, put coverage in place, fund the backdoor Roth IRA at $7,500, then max retirement with the HSA first inside the tier, the deferral to $24,500, a governmental 457(b) where one exists, and the mega backdoor last, then finish the reserve before taxable investing. The group plan decision sits on top of that order. A partner whose household has not finished the earlier steps does not fix that gap by voting the group into a larger plan; the plan shelters a surplus, and the waterfall is what creates one.

What happens to my cash balance benefit if I leave the group?

The benefit you have accrued stays yours under the plan terms, and at exit or retirement it can generally be rolled into an IRA as a lump sum or taken as an annuity as the plan allows. What changes at departure is the funding story: you stop earning new pay credits. Read the vesting schedule and the distribution rules before you sign the plan adoption, not at your exit negotiation, because the exit is the wrong season to discover a schedule you never read.

Related questions

• Should an established OB/GYN group add a cash balance plan?
• When does dropping obstetrics and keeping gynecology make financial sense?
• How do I budget for OB/GYN malpractice premiums in private practice?

Sources

• Internal Revenue Service (cash balance plans: a defined benefit plan stating the promised benefit as a hypothetical account balance, credited with pay and interest credits, with the employer bearing investment risk, accessed October 2026)
• Internal Revenue Service (Notice 2025-67, the 2026 deferral limit of $24,500 and total additions limit of $72,000, accessed October 2026)
• Medscape (Physician Compensation Report 2026, OB/GYN average compensation of $390,000, accessed October 2026)
• Doximity (Physician Compensation Report 2026, OB/GYN average total compensation of $420,859, accessed October 2026)
• Lisa and Mark, Financial Health Assessment case (an established OB/GYN household funding a 401(k) to the match with the rest as leftovers, accessed October 2026)

Takeaways

• Fit the spread with layers: a 401(k) with profit sharing as the base, and a cash balance plan on top for the partners the $72,000 ceiling constrains.
• The cash balance mechanics size contributions by age and pay, so the partner closest to retirement shelters the most.
• The layer costs a required funding promise in lean years and recurring actuarial fees.
• Adopt it as a group, with shared horizons and a census study. A plan built for one partner is a plan the group will regret.