The 62-to-70 Window: Why This Is Your Most Valuable 401(k) Tax Opportunity

"With no wages, no Social Security, and no RMDs yet, this couple controls almost every line on their 1040. That control disappears when Social Security starts and again at age 73 when RMDs begin. Every dollar left inside the traditional 401(k) at that point becomes ordinary income on a schedule the IRS dictates, often stacked on top of taxable Social Security and triggering IRMAA Medicare surcharges."

"The mechanic that changes everything is the interaction between two separate brackets that both reset each year: the ordinary-income bracket the standard deduction shelters, and the 0% long-term capital gains bracket that sits underneath the 15% LTCG rate."

"Roth conversion to fill the 12% bracket. They move $66,950 from the traditional 401(k) into the Roth IRA. Combined with the roughly $30,000 MFJ standard deduction, that conversion lands entirely inside the 10% and 12% ordinary brackets. Federal tax on the conversion: about $7,700 blended."

"Harvesting gains at 0%. They sell $93,750 of brokerage holdings, with $56,250 of basis and $37,500 of long-term gain. Because the 0% LTCG bracket for married filers extends to roughly $96,700 of taxable income, that $37,500 gain stacks on t"

A retired couple with assets in a traditional 401(k), Roth IRA, and a taxable brokerage plans to fund eight years of spending while delaying Social Security to age 70. During the gap before Social Security and before required minimum distributions begin, they control most lines on their federal tax return. They use bracket stacking by filling the ordinary-income space sheltered by the standard deduction and then harvesting long-term capital gains within the 0% bracket. In year one, they convert $66,950 from the traditional 401(k) to the Roth IRA to land in the 10% and 12% brackets, paying about $7,700 blended federal tax. They also sell $93,750 of brokerage holdings, realizing $37,500 of long-term gains taxed at 0% by staying within the 0% LTCG threshold. This approach shrinks the future traditional-IRA and 401(k) base subject to RMDs and helps avoid stacking ordinary income with taxable Social Security and Medicare surcharges.

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