Quick Read <\/p>\n
$1.5M at 5% growth reaches $2.33M by age 73, forcing $87,800 RMDs that trigger IRMAA tier 3 surcharges.<\/p>\n<\/li>\n
Convert $80,000 annually to Roth for nine years, reducing age 73 RMDs to $60,400 and saving $66,000 in lifetime IRMAA costs.<\/p>\n<\/li>\n
Are you ahead, or behind on retirement? SmartAsset’s free tool can match you with a financial advisor in minutes to help you answer that today. Each advisor has been carefully vetted, and must act in your best interests. Don’t waste another minute; learn more here.<\/a>(Sponsor)<\/p>\n<\/li>\n<\/ul>\n A 64-year-old single retiree with $1.5 million in a traditional 401(k) looks at the balance with quiet satisfaction. Then a fee-only planner runs the projection. By age 73, when required minimum distributions kick in, that account is on track to push her squarely into IRMAA tier 3, the Medicare income surcharge band that quietly siphons thousands out of retirement cash flow every year. The fix is mechanical, unglamorous, and almost never discussed at the kitchen table: roll the 401(k) to a traditional IRA, then convert in slices.<\/p>\n Why the RMD Cliff Is Steeper Than It Looks <\/p>\n Assume the $1.5 million balance grows at 5% annually for nine years. That assumption is conservative against today’s backdrop, with the 10-year Treasury near 4% and the Fed funds upper bound near 4%. By age 73, the balance projects to roughly $2.33 million, forcing first-year RMDs near $87,800. Add Social Security and any pension income, and modified adjusted gross income blows past the $167,000 single IRMAA tier 3 threshold for the rest of her life.<\/p>\n Tier 3 is the cliff. Tier 3 surcharges stack on top of the standard Medicare Part B and Part D premiums, and they recur every year MAGI stays elevated. Worse, they also drive 85% of Social Security into taxable territory, layering an effective marginal rate close to 40% on top of an ordinary federal bracket that already feels uncomfortable.<\/p>\n Are you ahead, or behind on retirement? SmartAsset’s free tool<\/a> can match you with a financial advisor in minutes to help you answer that today. Each advisor has been carefully vetted, and must act in your best interests. Don’t waste another minute; learn more here.<\/a>(Sponsor)<\/p>\n The Nine-Year Conversion Window <\/p>\n The strategy: at 64, roll the workplace 401(k) into a traditional IRA (cleaner conversion mechanics, broader investment menu), then convert $80,000 per year from age 64 through 72. Total moved to Roth: $720,000 over nine years. Tax cost in the 22% to 24% bracket lands around $158,000 to $173,000, paid from a taxable brokerage account so every dollar of conversion lands inside the Roth.<\/p>\n What is left in the traditional IRA at 73? Roughly $1.6 million, which generates RMDs near $60,400 in the first distribution year. That is the figure that matters. It keeps MAGI under tier 1 in most years from 73 through 79, because Roth distributions do not count toward Medicare MAGI at all.<\/p>\n The IRMAA Lookback Trap You Cannot Ignore <\/p>\n Medicare uses a two-year MAGI lookback. An $80,000 conversion at age 64 affects nothing (Medicare starts at 65), but conversions from 65 through 72 will likely trigger first-tier IRMAA at ages 67 through 74. That is the honest tradeoff. The savings come from avoiding the higher tiers later, when MAGI would otherwise climb into tier 3.<\/p>\n Net lifetime IRMAA savings under this plan: roughly $5,500 per year for 12 years, or about $66,000. Layered on top are reduced Social Security taxation in the 70s and 80s, and lower ordinary income tax on the smaller residual RMDs. With core PCE running near the 90th percentile of its 12-month range, locking in tax-free growth on future inflation-driven gains is its own quiet win.<\/p>\n Three Moves That Make This Work <\/p>\n Pay the conversion tax from a taxable brokerage account, never from the IRA itself. Withholding from the converted balance shrinks the Roth and, before 59 1\/2, can trigger penalties. After 59 1\/2 it just defeats the purpose.<\/p>\n<\/li>\n Size each conversion to the top of the 24% bracket, not a dollar over. Use partial-year top-offs in November and December once the year’s other income is known. A bracket-cliff overshoot can cost more than a full year of IRMAA savings.<\/p>\n<\/li>\n Map MAGI two years ahead, every year, before you pull the trigger. If the 2026 conversion will determine the 2028 Medicare premium, run the projection now. A fee-only advisor who specializes in Roth conversion sequencing earns the fee on this one calculation alone, and SmartAsset’s free advisor matching tool is a reasonable starting point.<\/p>\n<\/li>\n<\/ol>\n The 401(k)-to-Roth path will not appear on a quarterly statement. It shows up decades later, in the Medicare premium that did not arrive and the Social Security check that was not taxed.<\/p>\n If you\u2019re one of the over 4 Million Americans\u00a0 retiring this year, pay attention. (sponsor) <\/p>\n Finding a financial advisor who puts your interest first can be the difference between a rich retirement and barely getting by, and today it\u2019s easier than ever. SmartAsset\u2019s free tool<\/a> matches you with up to three fiduciary financial advisors that serve your area in minutes. Each advisor has been carefully vetted, and must act in your best interests.<\/p>\n\n