Why Affluent Couples Are Doing Roth Conversions at 62 and Claiming Social Security at 70, Not the Other Way Around
Most retirement calculators hand affluent couples a sequence that quietly costs them six figures in avoidable taxes. The order you convert and claim makes all the difference, and very few advisors are spelling it out.
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A 62-year-old couple with $1.8 million in traditional 401(k) accounts and another $400,000 in taxable brokerage assets has a decision most retirement calculators get backward. For households in this bracket, the math favors converting aggressively in the 60s and letting the Social Security check compound at 8% a year past full retirement age up to 70.
This is now common enough on Bogleheads and the ChubbyFIRE subreddit that it has a nickname: the “Roth conversion window.” The window opens the year wages stop and closes the year Social Security or required minimum distributions begin. For a couple retiring at 62, that window is eight years wide, and it may be the most valuable tax real estate they will ever own.
Why the Window Is So Valuable
Take that same couple. Neither is working. Neither is drawing Social Security. Their only reportable income is roughly $15,000 in dividends and interest from the taxable account. Against the $32,200 standard deduction for married filing jointly in 2026, they have negative taxable income before doing anything.
Now stack a Roth conversion on top. They can convert roughly $114,000 and still land at the top of the 12% bracket, which runs to $96,950 of taxable income for joint filers. Push harder and they fill the 22% bracket up to $206,700 of taxable income. Every dollar converted at 12% or 22% is a dollar that will not later be pulled out at 24% or 32% once pensions, Social Security, and RMDs are all firing at once.
RMD Problem You Are Preempting
Left alone, $1.8 million growing at 6% for eleven years becomes something close to $3.4 million by the time the first RMD hits at 73. That first-year RMD is roughly $128,000, and it stacks on top of two Social Security checks that could easily total $80,000 combined at age 70. Add pension income or dividends and this couple is squarely in the 24% federal bracket with up to 85% of Social Security becoming taxable, plus IRMAA surcharges on Medicare Part B and D that can run several thousand per person per year.
Convert $150,000 a year from 62 to 69 and the traditional balance at 73 is meaningfully smaller. RMDs shrink. Social Security taxation stays capped. IRMAA brackets stay clear. The cascade never fires (we sized up this quiet window between the last paycheck and the first RMD in a free Roth conversion guide).
Why Age 70 for Social Security
Delayed retirement credits are the highest-quality annuity money can buy. Each year past full retirement age adds 8% to the base benefit, and the increase is inflation-adjusted forever. The 2027 COLA is currently tracking toward 3.1%, and that adjustment compounds on the larger age-70 number for the rest of both lives.
The survivor benefit is the quiet reason this matters most for couples. If the higher-earning spouse delays claiming past full retirement age, the survivor can receive the full delayed benefit amount. Claiming at 62 locks in a lower check for whichever spouse lives longest, often into their 90s.
Opportunity-Cost Check Against Bonds and CDs
The pushback is always the same: paying tax now means less capital compounding. Fair, but check the alternatives. The 10-year Treasury yields almost 5%, and the national average 12-month CD sits at just under 2%. A guaranteed 8% Social Security bump beats both, and a Roth dollar shielded from future RMDs, IRMAA, and survivor-year single-filer brackets is worth substantially more than a traditional dollar.
What to Do This Quarter
- Model the conversion ladder. Run a projection that fills the 12% bracket first, then the 22% bracket. Stop before crossing the first IRMAA tier, which uses a two-year lookback and hits Medicare premiums at 65.
- Pay conversion taxes from the taxable account, not the IRA. Using IRA dollars to pay the tax wastes the shelter and, before 59½, triggers a 10% penalty.
- File a restricted Social Security strategy only if a fee-only advisor confirms eligibility. For most couples born after 1954, the answer is simple: both delay to 70, and bridge the gap with Roth conversions and taxable-account withdrawals.
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Jake has been been working in financial media for almost 15 years. He focuses on all things personal finance for 24/7 Wall St. with high hopes to educate and entertain. Most recently, Jake spent 12 years working various roles at The Motley Fool. He started copy editing fool.com content, worked on premium and marketing campaigns, and helped launch The Ascent, a personal finance brand.
His work has been featured on platforms like MSN, Yahoo Finance, USA Today, and more. He's written about credit cards, social security, ETFs, savings accounts, and just about anything else you can imagine when thinking about money. Jake love to cook, play golf, and tell people he's never had a cavity. (It's true!)
