What Happens to a $900,000 401(k) When a 62-Year-Old Moves $60,000 a Year Into a Roth Before RMDs Start at 75

A retired 62-year-old with a fully pretax $900,000 401(k) decides to shrink it on purpose. Each year, $60,000 moves out of the 401(k) and into a Roth IRA. The money stays invested the whole time. Only its tax status changes, and every conversion shows up as ordinary income on that year’s return.

This strategy illustrates how the mechanics work. It rests on one assumption: living expenses and the tax on each conversion are paid from outside money, such as cash or funds in a non-retirement investment account. If the tax comes out of the converted dollars, less money reaches the Roth and the strategy loses much of its value.

Thirteen Tax Years to Shrink the Pretax Pile Before RMDs Arrive

For anyone born in 1960 or later, required minimum distributions (RMDs) start at 75.

That leaves ages 62 through 74, which is 13 calendar years for conversions. At this pace, the conversions total $780,000.

Suppose the account never grew. About $120,000 of pretax money would be left. Divide that by 24.6, the distribution period for age 75 in the IRS Uniform Lifetime Table, and the first RMD comes to roughly $4,878.

This zero-growth example illustrates only how the money moves. Once returns enter the picture, the pretax balance left at 75 will be different and probably larger, and the RMD will be too. Still, the conversions leave less pretax money subject to RMDs than the same investment returns would have produced without them.

That small RMD is where the strategy pays off. Withdrawals from a traditional account count as ordinary income, and that income can make more of your Social Security benefits taxable. Qualified Roth distributions generally stay out of that calculation. A smaller pretax account today means less income feeding that chain of extra taxes later.

Let Each Year’s Tax Bill Set the Pace

A flat $60,000 every year works as an illustration but makes a poor rule. The right amount depends on what else lands on the return that year: pension income, Social Security once it starts, dividends and gains from the taxable account, and the deductions available.

Health coverage belongs in the same math. Before Medicare, a retired person buying marketplace coverage can lose premium subsidies as income rises, so a conversion can cost more than the tax alone. After enrollment, Medicare premiums are set by income levels that look back at earlier tax returns. A heavy conversion year can raise premiums down the road.

Each fall, compare the rate you would pay on the conversion with the rate you expect on those same dollars if they came out later as RMDs. When this year’s rate is lower, converting more makes sense (those silent years between the last paycheck and the first RMD are the whole subject of our free Roth Window guide). When a one-time spike, like a large capital gain, pushes this year’s rate up, convert less and make it up in a calmer year. The cash on hand to pay the tax sets the final ceiling.

Confirm the Plan Will Cooperate Before Moving a Dollar

A 401(k) can be rolled directly into a Roth IRA, and the converted amount is included in gross income for that year. Plans handle the details differently, though. Ask the administrator whether it allows partial distributions on a schedule you pick and whether it will send them straight to a Roth IRA trustee.

The path matters. A direct rollover generally has no tax withheld. If the plan makes the check payable to you personally, it must generally withhold 20%, and you then have 60 days to finish the rollover. If the plan only pays out the full balance, you can roll everything into a traditional IRA and convert from there in yearly pieces.

Check the Roth timeline as well. Earnings come out tax-free only after age 59½ and a 5-taxable-year period counted from the first year you contributed to any Roth IRA. A retired person without a Roth IRA should open one in the first conversion year so that timeline starts as early as possible.

Judge the Strategy by Taxable Income Year by Year

In this plan, the goal is to shift savings into the Roth, even if investment gains keep the 401(k) balance from falling every year. Success means controlling taxable income one calendar year at a time. Review the amount each autumn, once most of the year’s income is known, and finish the conversion before December 31 closes that year’s window.

A retired person who reaches 75 with a small pretax balance and a large Roth has more control over taxable income. The RMD formula still applies to the pretax money, but qualified Roth withdrawals can cover additional spending without boosting the tax bill.

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