The 11-Year Tax Window Most Retirees Miss Between 62 and 73

Between ages 62 and 73, most retirees pass through an unusually low-tax stretch of life they will never see again. Wages have stopped. Social Security can be delayed. Required minimum distributions from traditional retirement accounts have not yet kicked in. For roughly 11 years, taxable income sits in a valley, and that valley is exactly where Roth conversions do their best work. The problem is that most retirees never plan for it. They either claim Social Security at the earliest opportunity, drift through their 60s without revisiting the question, or wait until RMDs begin at 73 and find that the lowest-cost conversion years of their retirement are already behind them.

Why the Window Exists

Three rules that rarely line up in a person’s favor are what create the window. Social Security can be claimed at age 62, but benefits are reduced by up to 30% at that age, while waiting boosts checks by about 8% for each year of delay up to age 70. Retirees who can afford to delay often end up with several years of near-zero taxable income before benefits begin. Required minimum distributions, meanwhile, do not start until age 73, with the trigger age scheduled to move to 75 for those born in 1960 or later.

The 2026 brackets show how much room the valley actually contains. For tax year 2026, the standard deduction is $16,100 for single filers and $32,200 for married couples filing jointly. The 12% bracket runs up to $50,400 for singles and $100,800 for joint filers. The 22% bracket tops out at $105,700 for singles and $211,400 for joint filers, where the 24% rate then begins. A retired couple with little earned income can convert tens of thousands of dollars a year from a traditional IRA to a Roth and still have the conversion taxed at 12% or 22%, rather than facing those same dollars later at 24% or higher once Social Security and RMDs are both flowing.

A New Deduction That Widens the Window

Retirees converting between 2025 and 2028 have an additional lever that did not exist before. The One Big Beautiful Bill Act, signed into law on July 4, 2025, created a temporary $6,000 bonus deduction for taxpayers age 65 and older. For a married couple where both spouses are 65 or older, the combined benefit reaches $12,000. The deduction stacks on top of the base standard deduction and the existing age-65 add-on, reducing taxable income further and creating additional room for Roth conversions at lower marginal rates.

The catch is the phase-out. The benefit begins to shrink at $75,000 of modified adjusted gross income for single filers and $150,000 for joint filers, disappearing entirely at $175,000 (single) and $250,000 (joint). Inside that phase-out band, the effective marginal rate climbs well above the nominal bracket, turning a well-sized Roth conversion into an unexpectedly expensive one. Retirees doing conversions need to model the interaction of conversion income with this threshold before pulling the trigger each year.

What Retirees Are Walking Past

The cost of missing the window shows up later. Once RMDs begin, the IRS requires a withdrawal each year based on account balance and life expectancy, and an RMD cannot itself be converted to a Roth. Those required withdrawals stack on top of Social Security, pension, and investment income, routinely pushing retirees into a higher bracket than they ever paid while working.

Income receipts on assets across U.S. households reached $4,281.5 billion in the first quarter of 2026, and Social Security payments hit $1,630.3 billion in the same quarter, both still climbing. For a retiree, those trends point in one direction: future taxable income is unlikely to fall. That is the core argument for converting during the valley rather than waiting.

The Five-Year Rule Most People Forget

A separate trap inside the window is the Roth five-year clock. Each conversion starts its own holding period before the converted dollars can be withdrawn penalty-free for account holders under age 59½. The clock begins on January 1 of the year of each conversion and restarts with every new conversion. Once you reach 59½, the penalty no longer applies, but for those converting in their early 60s the timing still matters. Opening and funding a Roth IRA early, even with a small contribution, starts a separate five-year clock for tax-free earnings withdrawals. It does not, however, consolidate the conversion clocks.

Using the Window

Three patterns shape how the window gets used most effectively:

1. Annual taxable income between 62 and 73 sets the ceiling on how much traditional IRA income can be converted while staying within the 12% or 22% bracket. The $100,800 ceiling on the 12% bracket for joint filers is the most common target, though retirees aged 65 to 68 should also factor in the temporary OBBBA senior deduction when calculating their available conversion room.
2. Social Security timing interacts directly with the conversion math. Delaying benefits past 62 widens the valley and leaves more bracket space available for conversions each year.
3. The five-year clock on each conversion and the IRMAA thresholds both matter, since crossing the modified adjusted gross income thresholds can raise Medicare premiums significantly.

Once RMDs start at 73, the lowest-tax conversion years are gone, and the unconverted balance becomes a tax bill the retiree no longer controls.

Editor’s note: This article was updated to include the One Big Beautiful Bill Act’s new $6,000 senior deduction for taxpayers 65 and older (up to $12,000 for qualifying joint filers), effective for tax years 2025 through 2028, along with its phase-out thresholds and its interaction with Roth conversion strategies during the tax window. The 2026 standard deduction and income tax bracket figures were also verified against IRS Revenue Procedure 2025-32.

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