Retired Couple Plans $2.8 Million Roth Ladder to Defuse $3.2 Million Tax Hit

2 articles · Updated · 24/7 Wall St. · May 11

$2.8 million of the couple’s $3.2 million in traditional 401(k)s would be converted over 14 years, aiming to shrink age-73 balances to about $400,000 and keep later federal tax effectively at zero.
$200,000 annual conversions work because the pair has no wages or Social Security yet: roughly $67,000 fills the 12% bracket, about $110,000 fills the 22% bracket, and only a small slice reaches 24%, for a blended rate near 17%.
RMDs are the threat the ladder is designed to avoid: if the accounts are left untouched, the traditional balance could approach $6 million by 73, producing initial withdrawals above $225,000, taxing 85% of Social Security and pushing them into 24% to 32% brackets.
Age 63 becomes the key constraint because Medicare premiums are set two years later; heavy conversions at 59 through 62 can avoid the first 2026 IRMAA tier above roughly $212,000 of joint MAGI and its surcharges of $70 to $400-plus per person monthly.
$850,000 in brokerage assets and $250,000 in cash are meant to fund the roughly $476,000 conversion-tax bill without draining the Roth, with lot-by-lot sales and the cash reserve used to limit capital-gains taxes.

Can average retirees use this Roth strategy to avoid their own 'retirement tax bomb' on a smaller scale?

How does the 2025 OBBBA legislation create hidden risks for long-term retirement tax planning like this?

What market crash could derail this couple's plan to pay nearly half a million in conversion taxes?