How do catch up contributions stack for an OB/GYN after 50?

They stack plan by plan. Each eligible plan carries its own catch up room after 50. Past age 50, the retirement code lets you defer more than the regular limit inside each plan you are eligible for, and the stacking question for an OB/GYN is really an eligibility question, because many in the specialty work for hospital systems, and some run two plans at once. A physician at a public hospital may hold a 403(b) and a governmental 457(b) side by side, where both are offered, and those two plans have separate deferral limits and separate catch up room. A physician in a private group with a 401(k) holds one plan and one stack. Read your own plan list first, then stack the room in waterfall order.

Part of the OB/GYN hub.

The regular limits the catch up sits on top of

Start with the base, because catch up room is meaningless until the base is full. For 2026, the elective deferral limit is $24,500 for a 401(k), $24,500 for a 403(b), and $24,500 for a governmental 457(b), and the total annual additions limit is $72,000. The IRA limit for 2026 is $7,500, and the HSA limits are $4,400 for self only coverage and $8,750 for family coverage. Catch up contributions are additional deferrals the code permits once you pass age 50, added on top of the regular deferral limit of the plan you are contributing to. Physicians routinely assume the catch up is a single extra amount shared across every account, or that filling one plan uses up the room in the other. Neither is how the structure works. Each plan you are eligible for is its own vessel with its own regular limit and its own additional room past 50.

The hospital stack: a 403(b) and a governmental 457(b)

The fullest stack in this specialty belongs to the hospital employed OB/GYN past 50. The 403(b) comes first in the funding order, filled to its $24,500 regular deferral limit, with its catch up room added on top past age 50. The governmental 457(b) comes next, and physicians often underuse it, because it carries a separate $24,500 regular deferral limit of its own rather than sharing the 403(b) limit, and it carries its own catch up room past 50 as well. The governmental status matters: a governmental 457(b) holds its assets in trust for participants and allows rollover treatment a nongovernmental plan does not match, so confirm which kind your employer runs. The HSA sits first inside the max retirement step when you hold a qualifying high deductible health plan, at $4,400 self only or $8,750 family for 2026, and the IRA layer runs through the backdoor Roth route at the $7,500 limit. Stacked in order, the hospital physician past 50 fills the 403(b) base, adds its catch up, fills the 457(b) base, adds its catch up, and only then turns to the mega backdoor if the plan allows it and room remains under the total additions limit.

The private group stack, and where Lisa sits

The private group partner past 50 holds a simpler stack: one 401(k), with its $24,500 regular deferral, its profit sharing room under the $72,000 ceiling, and its catch up room past 50, plus the backdoor Roth IRA at $7,500 and a cash balance layer where the group runs one. There is no second deferral plan to stack, which is one reason the cash balance question matters so much in private practice at this stage. Lisa, the established OB/GYN in the case series, is 41, so her household is a decade from this question, and her case shows what the decade before it should look like. She and Mark earn about $550,000 together, save about 12 percent, fund her 401(k) to the match, and leave the rest as leftovers, with about $25,000 of reserves against about $25,000 of monthly spending. The catch up years reward households that arrive at 50 with the base already maxed and the reserve finished, because the additional room is only useful to a household with surplus to fill it. A household still funding to the match at 50 has a waterfall problem, not a catch up problem, and the fix is the order itself, run now.

Follow up questions

Does catch up room in one plan reduce the room in another?

No, and this is the misunderstanding that costs hospital physicians the most room. The 403(b) and the governmental 457(b) carry separate deferral limits, $24,500 each for 2026, and the catch up room attaches to each plan separately. Filling the 403(b) completely, base and catch up, leaves the 457(b) base and its catch up untouched. The plans share your cash flow and your tax picture. They do not share a limit. Treat the payroll elections as two decisions, made in waterfall order, not as one decision split across two forms.

Where does the HSA fit once I am past 50?

The HSA stays first inside the max retirement tier, ahead of the deferral race, when you hold a qualifying high deductible health plan. Its 2026 limits are $4,400 for self only coverage and $8,750 for family coverage, and it is a separate vessel from the deferral plans, neither sharing their limits nor competing with their catch up room. Fund it in its waterfall position, then run the 403(b) stack, then the 457(b) stack. The order exists because the HSA tax treatment is the strongest in the stack, and size is not the ranking rule.

What if I work for two employers in the same year?

Then the stacking gets personal, and payroll coordination becomes the work. The 401(k) and 403(b) deferral limit applies per person across every 401(k) and 403(b) you hold in the year, while a governmental 457(b) limit stands separate, and a mid year move can leave you eligible for a 403(b) stack for part of the year and a 401(k) for the rest. Bring both plan documents and both payroll contacts into one conversation before you set elections, because excess deferrals are a paperwork problem you create in January and discover the following spring.

Related questions

• What order should an OB/GYN fund retirement accounts?
• How do I stack a 403(b) and a 457(b) at a hospital OB/GYN job?
• Should an established OB/GYN group add a cash balance plan?

Sources

• Internal Revenue Service (Notice 2025-67, the 2026 elective deferral limit of $24,500 for each of a 401(k), a 403(b), and a governmental 457(b), the total annual additions limit of $72,000, and the IRA limit of $7,500, accessed October 2026)
• Internal Revenue Service (Revenue Procedure 2025-19, the 2026 HSA limits of $4,400 for self only coverage and $8,750 for family coverage, accessed October 2026)
• Lisa and Mark, Financial Health Assessment case (an established OB/GYN household at age 41 earning about $550,000, saving about 12 percent, a decade before the catch up window opens, accessed October 2026)

Takeaways

• Catch up room stacks plan by plan past 50. Each eligible plan adds its own additional room on top of its own regular deferral limit.
• The hospital stack is the fullest: a 403(b) at a $24,500 base for 2026 and a governmental 457(b) at a separate $24,500 base, each with catch up room of its own.
• The private group stack is one 401(k) under the $72,000 total additions ceiling, plus the backdoor Roth IRA at $7,500, plus a cash balance layer where the group runs one.
• The room only helps a household with surplus to fill it. Finish the waterfall in your forties so the fifties room lands on a ready base.