A 62-Year-Old Couple With $1.3 Million Just Realized They Had Their Retirement Plan Exactly Backwards

A couple posted a familiar plan to a Bogleheads thread this summer: both 62, roughly $1.3 million in traditional 401(k)s, planning to keep working two more years, delay Social Security until 70, and leave the retirement accounts untouched as long as possible so compounding could do its job. On paper the plan looks disciplined. In practice, they had the sequence exactly backwards, and the tax code is the reason.

The mistake lies in what happens to a fully pre-tax portfolio when both spouses are drawing maximum Social Security, both are on Medicare, and the IRS starts forcing withdrawals. Every dollar of that $1.3 million is taxable when it leaves the account, and by their mid-70s those withdrawals stack on top of two Social Security checks already inflated by years of cost-of-living adjustments. The 2027 COLA is currently tracking at 3.3%, and that compounding runs alongside the portfolio.

Low-Bracket Years Are the Asset, Not the Balance

Between age 62 and 70, this couple holds something they will never have again: taxable income they can control. For 2026, the joint standard deduction is $32,200, and the 12% bracket runs up to $100,800 of taxable income while the 22% bracket extends to $211,400 before jumping to 24%. Once Social Security turns on at 70 and required minimum distributions begin at 75, roughly $60,000 to $90,000 of that low-bracket space is already spoken for by taxable benefits alone.

A $1.3 million balance compounding at 6% for 13 years lands north of $2.7 million by age 75. The first-year RMD on that balance is roughly $110,000, and it lands on top of two Social Security checks. That combination pushes the couple deep into the 24% federal bracket, makes 85% of their benefits taxable, and crosses the $218,000 joint IRMAA threshold, where Medicare Part B climbs above the $202.90 standard 2026 premium and Part D surcharges kick in on top. The effective marginal rate on the last dollar of that RMD approaches 40% once the benefit haircut and the premium jump are both counted.

Backwards Fix: Draw Down Early

Reversing the plan means using ages 62 to 70 to intentionally realize traditional 401(k) income at the 12% and low-22% brackets, either through Roth conversions or by living off the 401(k) while Social Security keeps growing at roughly 8% a year of deferral credits. Converting $80,000 to $100,000 annually into a Roth while working part-time, or after retirement but before claiming Social Security, permanently removes that money from the RMD base at today’s rates (we sized up this exact window between the last paycheck and the first RMD in a free Roth guide here: The Roth Window).

Two 2026 rules are directly relevant to this couple. Workers ages 60 to 63 can contribute a $11,250 super catch-up on top of the $24,500 standard limit, for a $35,750 total. And if either spouse earned more than $150,000 in 2025, that catch-up must go into a Roth 401(k) rather than a pretax account. That requirement actually works in this couple’s favor: the plan already needs more Roth exposure and less traditional.

What This Couple Should Do Next

1. Model a conversion ladder that fills the 22% bracket every year from now through age 73, using the $211,400 top of the 2026 joint 22% bracket as the ceiling and adjusting for any wages. The goal is a traditional balance small enough at 75 that the RMD does not cross the $218,000 joint IRMAA line.
2. Direct any 2026 catch-up dollars into the Roth 401(k) deliberately, not because the rule forces it. At a 10-year Treasury yield now above 5%, safe income is finally competitive, so the Roth bucket does not have to sit entirely in equities to grow usefully.
3. Coordinate the Social Security claim with the conversion window. Filing at 70 while converting hard from 62 to 69 is the cleanest sequence. Filing at 66 while still converting is where the IRMAA trap catches most couples off guard, because Medicare uses a two-year lookback on modified adjusted gross income.

The couple’s instinct to defer was right about compounding and wrong about taxes. According to the Bureau of Labor Statistics, the average household spent $78,535 in 2024, a level this portfolio covers comfortably. Keeping the IRS from claiming an extra six figures over a full retirement is the harder problem, and it is solved in the years before 70, not after.

Editor’s note: This article updates the 2026 federal tax bracket thresholds for married filers (12% bracket ceiling raised from $96,950 to $100,800; 22% bracket ceiling raised from $206,700 to $211,400, per IRS Rev. Proc. 2025-32), corrects the Roth conversion ladder ceiling in the action list to match, and notes the 10-year Treasury yield above 5% as of early October 2026.

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