A 67-Year-Old With $2 Million in a 401(k) Discovers RMDs Will Trigger a $400,000 Tax Bill

The retiree who built a $2 million traditional 401(k) by age 67 did everything right. Maxed contributions for decades. Captured the match. Stayed invested through every selloff. Now, at 67 with $25,000 in Social Security already claimed and no Roth assets, the plan looks obvious: let the 401(k) keep compounding until required minimum distributions kick in at 73. That decision quietly hands the IRS a six-figure bill the reader never agreed to.

What $2 Million Becomes by Age 73

Compound $2 million at 6% for six years and the balance reaches roughly $2.84 million. That growth looks like a win, but the IRS has been waiting for it. Under SECURE 2.0, the first RMD lands at age 73, and the IRS Uniform Lifetime Table divisor at 73 is 26.5.

The math is uncomfortable: $2.84 million divided by 26.5 equals $107,170. That is the forced withdrawal in year one, taxed as ordinary income whether the retiree spends a dollar of it or not.

How the RMD Stacks With Social Security

The RMD lands on top of Social Security. With $25,000 in benefits, the income stack pushes 85% of Social Security, or $21,250, into taxable territory. Combined gross taxable income reaches $128,420. Subtract the $16,550 single 65-and-over standard deduction and taxable income lands at $111,870, deep into the 22% to 24% single bracket.

Federal tax in year one alone runs $19,000 to $21,000. That ignores IRMAA. Once modified adjusted gross income clears the first Medicare surcharge threshold, Part B and Part D premiums jump by hundreds of dollars per month, with a two-year lookback that means the 73-year-old's RMD raises premiums at 75.

Why It Compounds Every Year

The divisor shrinks as the retiree ages. At 75 it is 24.6. At 80, 20.2. At 85, 16.0. At 90, 12.2. A smaller divisor against a balance still compounding near market returns means the forced withdrawal grows in both nominal and real terms. Cumulative RMD-driven federal tax over a 20-year retirement exceeds $400,000, before state tax, before IRMAA, before the widow's penalty that hits a surviving spouse filing single on the same income stack.

With CPI near 330 and inflation running above the Fed's 2% target, the drag compounds the problem: nominal RMDs rise, real purchasing power falls, and bracket thresholds adjust slower than a balance growing at market rates.

Four Levers That Actually Move the Number

1. Bracket-filling Roth conversions between 67 and 73. Convert enough each year to fill the 22% or 24% bracket without spilling into the next one. Six years of disciplined conversions can shrink the traditional balance by hundreds of thousands, lowering every future RMD permanently. With the 10-year Treasury near 4% and the Fed Funds upper bound near 4%, conversions also lock in today's rates against future bracket creep.
2. Qualified Charitable Distributions after 70.5. A QCD sends IRA dollars directly to charity, counts toward the RMD, and never enters AGI. The 2026 QCD limit is $111,000 per person. For charitably inclined retirees, this is the cleanest RMD offset the code allows.
3. A Qualified Longevity Annuity Contract. A QLAC lets you carve up to $210,000 of 401(k) balance out of the RMD calculation entirely, deferring income to as late as age 85. It shrinks the divisor problem and hedges longevity risk in one move.
4. Spousal sequencing for married couples. The widow's penalty turns a joint return into a single return overnight, often at the same income. Coordinate which spouse converts, which claims first, and which inherits to flatten the post-death tax cliff.

What to Do This Quarter

Run your own version of the math: take your current 401(k) balance, compound it at your expected return to age 73, divide by 26.5, and stack the result on top of Social Security and any pension. If the projected income clears the first IRMAA threshold, the Medicare surcharge alone justifies a fee-only CPA or advisor who models multi-year conversions. Pull the IRS Uniform Lifetime Table from Publication 590-B and verify the divisor at every age from 73 to 90. The retiree who waits until 72 to start planning has already given up most of the available savings.