Quick Read
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Waiting until 63 to convert $80,000 a year can lead to a reduction in tax brackets from 17% to 24%, ultimately saving around $315,000 by age 73.
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If you aim to convert, it’s wise to build a reserve of about $150,000 in outside savings to handle the conversion tax without touching your $2.2 million in a traditional 401(k).
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This scenario resonates with many: a 58-year-old engineer or executive earning over $300,000 has $2.2 million in a traditional 401(k) and plans to retire at 63. My first thought is often to delay decisions. Yet, the numbers suggest otherwise. The next five years may not be ideal for conversion. The upcoming decade is crucial for determining if your required minimum distribution (RMD) will lead to about $136,000 or $451,000 in federal taxes.
The difference? About $315,000—essentially game-changing.
Why is it better to wait for the next five years?
At 58, still earning within the 24% tax bracket, converting traditional dollars to Roth often doesn’t make sense. Any dollar converted increases your taxable income. For couples filing jointly in 2026, the 24% bracket ranges from around $207,000 to $395,000, which many high earners already occupy. Converting $100,000 would incur $24,000 in federal taxes, plus possibly higher state taxes.
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Waiting until your paycheck ends allows for conversions under the 12% (up to about $97,000) and 22% brackets (up to around $207,000). This method follows research from Wade Pfau and Michael Kitces, offering an understanding of why the reader might want to delay their conversions.
A Decade of Opportunity: 1963-1973
Your retirement at 63 opens up a window, but it starts to close with RMDs at 73. Social Security can be postponed, and your 401(k) remains your primary income source. This period presents an incredibly favorable tax environment for higher earners.
The goal plan? Aim for approximately $80,000 annually over ten years, totaling $800,000. When added to minimal other income sources, these conversions minimize your tax burden, landing you in the 12% range and the lower part of the 22% range. Your blended federal tax rate might hover around 17%, costing about $136,000 in taxes.
Now, if you choose to do nothing? Keeping that $2.2 million untouched for 15 years might result in roughly $4 million by age 73. The first RMD, based on the IRS Uniform Life Schedule divisor of 26.5, is about $151,000 and will rise annually. Adding Social Security on top of that may push you into a 24% to 32% tax range, accumulating about $451,000 in federal taxes on those RMDs.
The Unexpected IRMAA Trap
Medicare eligibility kicks in at 65, and a two-year look-back on your modified adjusted gross income (MAGI) determines your premiums. If a conversion occurs at age 63, it could affect your Part B premiums set when you turn 65.
For married couples filing jointly in 2026, IRMAA Tier 1 starts at a MAGI around $218,000, adding roughly $81 monthly per person to the baseline Part B premium of about $203. Higher tiers can escalate quickly. An $80,000 conversion keeping your MAGI under $218,000 remains clean, but pushing it to $275,000 with a $150,000 conversion could mean an extra $200 to $400 per person monthly after two years. Carefully sizing your annual IRMAA threshold conversion holds as much importance as gauging your tax bracket.
Details that Could Disrupt Your Plans
It’s essential to pay conversion taxes from a tax brokerage account. Utilizing 401(k) funds for this causes inaccuracies in calculations. Those without about $150,000 in outside savings for a decade of tax obligations should either begin building that cushion now or reconsider the conversion timing.
Three Steps to Consider This Year
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Create a tax bucket. For the next five years, redirect new savings from the aforementioned 401(k) to a tax brokerage account. This cash can cover the tax costs associated with conversions between ages 63 to 73 without impacting your IRA.
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Plan a transformation ladder for avoiding IRMAA cliffs. Execute planned conversions annually up to the 2026 MFJ bracket and the $218,000 IRMAA threshold. Stick with whichever limit is reached first.
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Decide on Social Security timing before age 63. Deferring benefits until 70 can keep your conversion window tidy while enhancing your benefits by roughly 8% for each year postponed. Taking benefits early may confine your tax brackets, risking a significant portion of your savings.
The five-year window is something easy to neglect. Each year, a considerable percentage continue working past 58 without making conversions. After hitting 73, mandatory withdrawals occur annually. There’s a potential savings of $315,000 within that timeframe.
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