Dana is a CRNA. She is 58 years old, married to Marcus, an RN at the same hospital. Together they earn around $310,000 a year. She has been with the same hospital for 22 years, and has maxed her 403(b) every one of those years. Her balance today is $1.4 million.
Dana walked into her first planning meeting feeling good about where she stood. She had done what every retirement article told her to do. What she found out in that meeting is that the structure of her retirement account, not the size of it, was about to cost her household well into six figures over the next 25 years. Unfortunately, Dana’s situation is the default.
The One-Account Problem
Dana’s $1.4 million is 96 percent concentrated in pre-tax accounts. The consequence is a set of rules she doesn’t get to choose. At age 75, her Required Minimum Distribution on a balance projected to grow to roughly $2.4 million is about $96,000 in the first year. The IRS calculates that number for her. She does not get to decide whether she needs that income… she just gets the bill.
That $96,000 stacks on top of Marcus’s RMD and their Social Security. The household sits in the 24 percent federal bracket plus the second IRMAA tier for Medicare, every year of their retirement. IRMAA is the income-related Medicare surcharge that adds to your Part B and Part D premiums when income crosses certain thresholds. It is a cliff, not a slope.
Dana saved everything in her 403(b) because it’s what the default system rewards, but it’s a costly tax mistake.
The Unread Plan Document
Dana works at a non-profit hospital, which changes what she has access to. Her plan allows her to fund a 457(b) alongside her 403(b). A 457(b) is a deferred compensation account that non-profits can offer at the same contribution limits. For 2026, that is $24,500 a year of additional tax-advantaged space.
Her plan also has an after-tax contribution sleeve inside the 403(b) that can roll into a Roth through an in-service rollover. Her HSA can be invested once the balance crosses $1,000.
Dana has used none of these. For eight years, she had access to roughly $24,500 a year through the 457(b) alone. That is close to $200,000 in contributions she never made. Plan documents are written for compliance, not education. HR did not walk her through the optional sleeves at orientation. Nobody pointed at the 457(b) and explained what it means for retirement.
The Quiet Tax Window
Between Dana’s last paycheck at 65 and the year Social Security and required distributions hit her tax return at 73, there is an eight-year stretch where her taxable income will be the lowest it will ever be again.
It is the cheapest tax window of a high-earning nurse’s career. Most pre-retirees never see it. They think about retirement in two stages: working, then retired. The model they need has a third stage in the middle.
Inside that window, Dana and Marcus could move $40,000 to $60,000 a year out of the 403(b) and into a Roth IRA at the 12 percent federal bracket. Five to seven years of that adds up to two to three hundred thousand dollars permanently outside the IRS’s reach. After Social Security and RMDs hit at 73, the same conversion costs them double. That window doesn’t reopen.
What Dana and Marcus Did
They redirected $35,000 a year of new contributions across Roth and taxable accounts. Dana used her 457(b) as a bridge between retirement and Social Security. Once retired, they converted about $55,000 a year out of the 403(b) at the 12 percent bracket for five years, paying the tax from the taxable account they had built first.
Across a 25-year retirement, the household pays approximately $190,000 less in lifetime federal taxes. They hold an additional $290,000 in Roth assets. They never cross the second IRMAA tier in any year.
Every year of retirement, the tax rate on the next dollar Dana pulls is a number she chose (instead of what the IRS would impose).
Three account types are working together: pre-tax, Roth, and taxable. Tax-aware ordering of where new dollars go. A planned conversion runway in the years between the final paycheck and Social Security.
We call this the Tax Diversification Reset. The money on the table was missed flexibility, and the window to rebuild it opens before retirement, not after. If it’s time to take a closer look at your retirement accounts, schedule a meeting with Oak Capital Advisors to see how we can help you get on track.
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