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By age 73, Required Minimum Distributions on $1.05 million in tax-deferred accounts will force $50,000+ in ordinary-income withdrawals annually whether the couple needs the cash or not, pushing them into the 24% tax bracket and eroding the safety of their 3.9% withdrawal rate.
Between age 66 and 72, convert $70,000 to $90,000 annually from the traditional IRA to a Roth IRA to slash future RMDs by half and restore tax control during the back half of retirement when healthcare costs rise.
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A couple, both 66, enters retirement with $1.2 million in savings and a plan that looks clean on paper: withdraw $46,800 per year (a 3.9% rate), collect $64,800 annually in combined Social Security, and live on $111,600 total annual household income. The Trinity Study says 3.9% is safe. Their retirement horizon of 28 to 32 years aligns with the study's assumptions. But there's a big problem. One that's invisible until age 73. And by then, it will be too late to fix cheaply.
Portfolio: $1.2 million split 40% traditional IRA, 35% 401(k), 25% taxable brokerage
Planned withdrawal: $46,800/year (3.9% of portfolio)
Social Security income: $64,800/year combined
Core risk: Required Minimum Distributions beginning at 73 will override their withdrawal strategy and create a compounding tax problem
The Trinity Study, which gave the world the 4% rule, was built on a 50/50 stock/bond portfolio over a 30-year horizon. This couple's timeline fits. But the study assumed the retiree controls the timing and amount of every withdrawal. At 73, that assumption breaks. Their $1.2M is 75% in tax-deferred accounts: 40% in a traditional IRA, 35% in a 401(k). The IRS requires withdrawals from both starting at age 73. Those are Required Minimum Distributions, calculated using the IRS Uniform Lifetime Table, not the couple's spending needs.
By age 73, the combined IRA and 401(k) balance, currently roughly $900,000, could grow to approximately $1.05 million. At 73, the IRS distribution period is roughly 26.5 years, which means the RMD on a $1.05 million balance would be approximately $39,600 per year. That covers 85% of their planned $46,800 withdrawal on its own.
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In a strong market year, the portfolio grows faster, and the RMD grows with it. The couple could face a forced withdrawal of $50,000 or more, all taxed as ordinary income, whether they need the cash or not. In a down market, the RMD shrinks, but so does the portfolio value, compressing their options exactly when they need flexibility most.
This couple's $111,600 total income already places them in the 22% federal bracket for married couples filing jointly in 2026. Every dollar of RMD lands on top of Social Security and gets taxed as ordinary income. A forced $50,000+ RMD in a good market year could push a portion of their income into the 24% bracket, which under 2026 rates begins at $211,400 for married filers.
Inflation compounds the problem. The CPI has risen steadily from 320.3 in April 2025 to 330.3 by March 2026, reflecting persistent price pressure. A withdrawal strategy that looks adequate today may fall short in purchasing power by their mid-70s, pushing them to draw more from the portfolio at exactly the wrong time.
Between age 66 and 72, this couple has a seven-year window where they control their taxable income almost entirely. Social Security is fixed. Portfolio withdrawals are voluntary. This is the Roth conversion window, and it is the most powerful tax-planning lever available to them.
The strategy: convert $70,000 to $90,000 per year from the traditional IRA to a Roth IRA between ages 66 and 72. Each conversion is taxable in the year it occurs, but it permanently reduces the tax-deferred balance subject to future RMDs. A Roth IRA has no RMDs. Withdrawals from it in retirement are tax-free.
The tradeoff is paying taxes now at a known, moderate rate instead of paying them later at an unknown, potentially higher rate on a larger balance. The Fed Funds rate is near 3.75%, and the 10-year Treasury yields about 4.3%, meaning the couple can hold conservative fixed-income assets in the taxable account to fund living expenses during conversion years without selling equities at inopportune times.
Converting $80,000 per year for seven years removes a substantial portion from the tax-deferred pile before RMDs begin. That alone could cut their age-73 RMD by half or more, restoring control over withdrawal timing and keeping more income out of higher brackets.
Do nothing and let RMDs happen. The simplest path and the most expensive. By 73, the couple loses control of withdrawal timing, faces forced distributions that may exceed spending needs, and pays ordinary income tax on every dollar regardless of market conditions.
Convert aggressively to Roth between 66 and 72. Pay taxes now at a predictable rate, reduce future RMDs dramatically, and preserve tax-free income for the back half of retirement when healthcare costs tend to rise. This is the right path for most people in this situation.
Partial conversions targeting the top of the 22% bracket. Convert just enough each year to fill the 22% bracket without crossing into 24%. This is less aggressive but still meaningfully reduces the RMD burden and is appropriate if cash flow is tight during early retirement years.
Paths two and three both work; the right choice depends on cash flow and tax tolerance in the conversion years. The do-nothing path offers no meaningful advantage.
Run a Roth conversion projection before the end of this calendar year. The goal is to determine how much to convert annually to stay in the 22% bracket while meaningfully shrinking the future RMD balance. A fee-only tax planner or CPA with retirement specialization is worth the cost because the conversion amount must be calibrated against Social Security taxation thresholds, Medicare IRMAA surcharges, and state income tax. Getting this wrong by $10,000 in either direction can compound dramatically over seven years. The account structure is the real problem here. Fix it now, and the withdrawal rate takes care of itself.
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