On a recent episode of the Money Guy Show titled Van Life Millionaires Are Leaving Millions on the Table, co-host Bo Hanson described a couple, Robert and Carrie, who had done almost everything right. They saved diligently into pre-tax retirement accounts and built a healthy portfolio. Then their planner ran the numbers forward.

Quick Read

  • Couples with large traditional 401(k) and IRA balances face a ‘tax bomb’ at age 75 when Required Minimum Distributions begin, potentially jumping from 12% to 32%+ tax brackets; strategic Roth conversions between retirement and age 75 can save $1.3 million in taxes and add $3.5 million in assets over a lifetime.

  • The math of Roth conversions depends entirely on converting at today’s lower tax bracket to avoid forced withdrawals at projected higher brackets in retirement, with loss harvesting in taxable accounts amplifying the benefit during conversion years.

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Hanson’s diagnosis: “When we actually forecasted their income tax situation out into retirement, once they hit required minimum distribution age at 75, a tax bomb blew up in them. When they were so used to being in the 12% marginal tax bracket. Now all of a sudden they blow up into the 32% marginal tax bracket later on in life.”

By executing strategic Roth conversions between retirement and the start of RMDs, the couple could end up with almost $3.5 million more in assets and pay almost $1.3 million less in taxes. That is the stakes-setter. If you are in your 40s with seven figures already in a traditional 401(k), the IRS is a silent partner whose share grows every year you ignore it.

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The verdict: Hanson is right, and most savers underestimate this

The advice is sound and the urgency is real. Traditional 401(k) and IRA balances are pre-tax. Every dollar you withdraw is taxed as ordinary income. At age 75, the IRS forces you to begin Required Minimum Distributions whether you need the cash or not. The RMD divisor at 75 is roughly 24.6, meaning you must pull out about 4% of your balance that year, with the percentage rising annually.

Run a realistic scenario. A couple, both 45, has $1.5 million in a traditional 401(k). Assume a 7% annual return and continued contributions. By age 75 that balance can plausibly reach $6 million to $8 million. A first-year RMD on $7 million is roughly $285,000, on top of Social Security and any pension or dividend income. That stacks a couple who lived comfortably in the 12% federal bracket into the 32% bracket, exactly the jump Hanson describes.

If they retire at 62 and convert $150,000 per year from traditional to Roth until age 75, they fill up the 22% and 24% brackets at today’s rates while their earned income is gone. Those converted dollars grow tax free, never trigger an RMD, and pass to heirs tax free. The arithmetic difference over 25 years of compounding, against a future 32% to 37% bracket on forced withdrawals, is exactly how a planner produces a swing of $1.3 million in lifetime taxes.

The variable that flips the math

The single factor that determines whether conversions help or hurt is your marginal bracket today versus your projected marginal bracket at 75. If you will retire into a lower bracket than you live in now and stay there, conversions are a bad trade. If your projected RMD bracket is higher than your conversion-year bracket, every dollar you convert at the lower rate is a guaranteed return equal to the bracket spread.

Inflation tightens the case. With CPI running near 2% year over year and the federal funds rate near 4%, tax brackets adjust upward each year, but so do account balances. Bracket creep on a $7 million RMD is far more punishing than bracket creep on a $200,000 salary.

Brian Preston also flagged the companion tool for accounts outside retirement plans: “When the markets are going down or you created losses, you have losses on your portfolio, you don’t have to just sit there and just hope… You can actually use it as a powerful tool to lock in losses” to offset future gains. Harvested losses carry forward indefinitely and can shelter gains generated when you rebalance during the conversion window.

What to do this quarter

  1. Run a 30-year tax projection. Use a planner or software that models RMDs at 75 against your current trajectory. You are looking for the bracket at first RMD, not just the balance.

  2. Map your conversion window. Identify the years between your planned retirement date and age 75. That is your runway to move money from traditional to Roth at known rates.

  3. Track your taxable brokerage for harvestable losses. Pair loss harvesting with conversion years so realized gains during rebalancing get absorbed.

  4. Spot-check savings rate now. Hanson’s guidance for people in their 40s is to “spot-check where you are” and start “hyper-saving if I’m behind.”

The tax bomb is arithmetic on a balance you already own. The only question is whether you defuse it on your schedule or the IRS’s.

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