Should an established OB/GYN group add a cash balance plan?

For an established group with stable income and senior partners pressed against the defined contribution ceiling, plausibly yes, and it is one of the largest tax decisions left on the table. A cash balance plan shelters far past the $72,000 ceiling, for a price. The plan is a defined benefit plan that a practice pairs with its 401(k) profit sharing plan, and its promised benefit is stated as a hypothetical account balance. Because the contribution funds a benefit promised at retirement age, the required funding for an older partner is far larger than any defined contribution limit allows over the same window, which is exactly the room a senior partner needs and exactly the promise the group has to be able to keep.

Part of the OB/GYN hub.

Why this room opens only at the established stage

Read the plan against the waterfall to see why it cannot arrive earlier. The order finishes at taxable investing beside written goals: the full employer match captured, reserves built, credit cards to zero, coverage in place with disability above all, the backdoor Roth IRA funded 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 the reserve finished before the first taxable dollar. For an owner, a cash balance plan is the layer above the 401(k): room that only matters once every room in front of it is fully used, and once practice income is steady enough to promise an actuary a funding schedule. The specialty numbers explain why the established stage is where the question turns serious. Medscape reports average OB/GYN compensation of $390,000, and Doximity reports average total compensation of $420,859. At that income, a partner who has maxed the 401(k) and finished the reserve still has a surplus landing in a taxable account every year. The cash balance layer exists to move that surplus into deductible shelter, at a scale the defined contribution plans cannot reach.

How the plan actually works inside a group

Each participant's account is hypothetical, stated on paper rather than held as a separate investment account. The plan formula credits the account each year with pay credits, tied to compensation, and with interest credits, set by the plan terms. The employer funds the plan with actuarially determined contributions, calculated to build each promised balance by retirement age. The employer, not the participant, bears the investment risk: if the plan investments earn less than the credits promise, the employer owes more. That single mechanic is why the plan fits an OB/GYN partnership spread. A partner with seven years to retirement must fund the promised balance across seven years, so the annual contribution is large. A partner with twenty years funds across twenty, so the annual contribution is smaller. The plan pairs commonly with a 401(k) profit sharing plan in professional practices: the 401(k) stays the flexible base for every partner and for staff, with its $24,500 deferral and its $72,000 total additions ceiling for 2026, and the cash balance plan sits on top as the layer sized by age and pay. No dollar cap is stated for that layer because the room is produced by actuarial funding mathematics, and the honest figure for your group comes from a design study run on your actual census.

The commitment, priced against OB/GYN reality

The price of the room is a funding commitment that does not flex with the specialty's income cycle, and OB/GYN income cycles have a specific driver: the malpractice premium. Premiums have risen for seven consecutive years, and the premium is one of the largest overhead lines in the practice, at $135,974 in Philadelphia and $243,988 in Miami Dade for $1M/$3M coverage. A group that adopts the plan in a comfortable year owes the contribution in the year the premium jumps. The honest stress test prices the funding against the worst recent year in the practice, not the best year anyone remembers. Administration and actuarial fees are part of the true price, as are the coverage obligations that pull staff and younger partners into the design. The commitment also reaches into the exit timeline. The plan must be wound down or handled correctly when a partner retires or the group sells, with administrator guidance at the center of that work. A group planning a sale inside a short window has a sequencing problem to solve first.

Follow up questions

Does the plan replace our 401(k) profit sharing plan?

It pairs with it. The core plan keeps its $24,500 deferral and its place in the funding order, and the cash balance plan sits on top as additional room for the partners the ceiling constrains. The waterfall beneath both does not change: match, reserves, cards, coverage, Roth space, HSA, deferrals, reserve finish, and only then the plan sized for the surplus that remains. Groups that adopt the layer and then starve the base plan have the design backwards; the base serves everyone, and the layer serves the spread.

What happens if a lean year makes the contribution painful?

The contribution is still owed, because the benefit was promised. That is the central trade of every defined benefit structure: the shelter is large precisely because the promise is real. A group in genuine distress works with its actuary and benefits counsel on the options the law allows, but none of those options is a casual pause. This is why the design study should size promised benefits against conservative income, and why a group whose cash flow swings hard should promise less or wait.

Should we adopt if two partners retire within five years?

Adopt only with the exit in the same room. Partners near retirement gain the most from the layer, because their funding window is shortest and their annual room is largest. But retirements also end pay credits and start distributions, and a plan adopted and unwound inside a short span pays administration and actuarial costs for a brief shelter. Run the design study across the actual retirement dates, including the gynecology only phase some partners plan first, before anyone signs.

Related questions

• What retirement plan fits an OB/GYN group whose partners earn unevenly?
• How do catch up contributions stack for an OB/GYN after 50?
• How do I exit or sell my share of an OB/GYN practice?

Sources

• Internal Revenue Service (cash balance plan mechanics: a defined benefit plan whose promised benefit is stated as a hypothetical account balance, credited with pay credits and interest credits, funded by the employer with the employer bearing investment risk, accessed October 2026)
• Internal Revenue Service (Notice 2025-67, the 2026 elective deferral limit of $24,500 and the total annual 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)
• American Medical Association, Policy Research Perspectives, medical liability premiums (OB/GYN premiums of $135,974 in Philadelphia and $243,988 in Miami Dade, and the seventh consecutive year of premium increases, accessed October 2026)

Takeaways

• A cash balance plan pairs with the 401(k) profit sharing plan to shelter far beyond the $72,000 ceiling for 2026, sized by age and pay.
• The employer bears the investment risk, and balances are credited with pay credits and interest credits under the plan formula.
• The price is a required funding promise owed in lean years too, priced against a premium that runs $135,974 in Philadelphia and $243,988 in Miami Dade.
• Adopt it with shared horizons and the exit timeline in the same conversation.