"Left untouched, the $3.2 million traditional balance compounding for 14 years roughly doubles, and RMDs at 73 on a $6 million balance start above $225,000 a year, pushing the couple into the 24% to 32% federal brackets, making 85% of Social Security taxable, and triggering IRMAA surcharges of $70 to $400+ per person per month."
"With no wages, no Social Security yet, and brokerage income managed carefully, every dollar converted lands at the bottom of the stack. The 2026 standard deduction for a married couple filing jointly is $30,000. The 12% bracket runs to roughly $96,950 of taxable income, and the 22% bracket runs to roughly $206,700."
"The plan converts about $200,000 per year. The first roughly $67,000 fills the 12% bracket above the standard deduction. The next roughly $110,000 fills the 22% bracket. A small slice spills into 24%. The blended federal rate lands near 17%. Across 14 years, $2.8 million moves from traditional to Roth, and the IRS collects roughly $476,000 in conversion tax."
"Medicare premiums in any given year are set from the tax return filed two years earlier. Conversions done at 63 and 64 set the IRMAA bill at 65 and 66, which is why heavy conversion years should finish before age 63."
A household with $3.2 million in traditional 401(k) plans to retire and delay Social Security until age 70, creating an 11-year window before required minimum distributions begin. Leaving the traditional balance to compound would increase RMDs at 73, pushing income into higher federal brackets, making most Social Security taxable, and triggering IRMAA Medicare surcharges. A 14-year Roth conversion ladder sized to available tax brackets converts about $200,000 per year, filling the 12% bracket above the standard deduction and then the 22% bracket, with only a small amount spilling into 24%. This approach moves about $2.8 million into Roth, with roughly $476,000 in conversion taxes. By 73, remaining traditional balances generate RMDs that stay below the standard deduction once Social Security is included, resulting in minimal federal tax. Medicare premium surcharges depend on tax returns filed two years earlier, so conversion activity should be completed before age 63 to avoid higher IRMAA at 65.
#roth-conversion-ladder #401k-and-rmd-planning #tax-brackets-and-standard-deduction #social-security-taxation #medicare-irmaa
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