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Most people spend their working years in their highest tax bracket. Then your retirement plan changes the equation. Once you stop working, your taxable income often drops, sometimes significantly. Paychecks disappear, withdrawals may not have started yet, and Social Security could still be years away.
For a brief period, your tax rate may be lower than it has been in decades. That gap creates one of the most valuable tax planning opportunities available: Roth conversions.
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Where the opportunity comes from
A Roth conversion allows you to move money from a traditional IRA or 401(k) into a Roth IRA. You pay taxes on the amount converted today, but future growth and withdrawals are tax-free.
The opportunity comes down to timing. During your working years, converting often means paying taxes at higher marginal rates. In retirement, before other income sources fully kick in, those rates may be lower. That creates a window where you can convert portions of your tax-deferred savings at a reduced tax cost.
Why the window is narrower than it looks
At first glance, it might seem like you have decades to make Roth conversions. In reality, the window is often much shorter. For many retirees, it begins the year they stop working. From there, two major events begin to close it.
The first is Social Security. Benefits can start as early as age 62, and many people begin between ages 62 and 67. Once those payments start, they increase taxable income and reduce how much room remains in lower tax brackets.
The second is required minimum distributions (RMDs). Under current rules, these begin at age 73. Once RMDs start, you are forced to withdraw taxable income each year, which can push you into higher brackets and limit the effectiveness of further conversions. In practice, that means the optimal window may only last a few years.
What the math looks like in 2026
In 2026, the 12% tax bracket for married couples filing jointly extends up to $100,800 in taxable income. With a standard deduction of $32,200, that means a couple could have roughly $133,000 in total income and still remain in the 12% bracket.
That creates a planning opportunity. If a retired couple has little other income, they may be able to convert tens of thousands of dollars from a traditional IRA to a Roth IRA each year while staying within that relatively low tax bracket. Instead of paying 22% or 24% later, they may be able to pay 12% today.
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Why this matters long term
Roth accounts grow tax-free and do not require minimum distributions during the account owner's lifetime. This gives you more control over when and how you take income.
By reducing the size of traditional IRA balances, conversions can also reduce future RMDs. Smaller RMDs mean less taxable income later in life, which can have a ripple effect.
It may reduce how much of your Social Security benefits are subject to tax. It can also help keep income below thresholds that trigger higher Medicare premiums.
Medicare IRMAA
One of the most important factors retirees need to consider is Medicare pricing. Medicare premiums are based on income through a system called IRMAA, or Income-Related Monthly Adjustment Amount. These surcharges are determined using a two-year lookback.
That means a Roth conversion in 2026 could increase your Medicare premiums in 2028. For married couples, crossing the first IRMAA threshold, which begins at $218,000 in modified adjusted gross income, can result in higher premiums for both Part B and Part D coverage.
A large conversion that pushes income over that line could add thousands of dollars in additional health care costs for the year. That does not mean Roth conversions are a bad idea. It means they need to be sized carefully.
Why bigger is not always better
One common mistake is assuming it is best to convert as much as possible as quickly as possible. In reality, the goal is often to fill up lower tax brackets without spilling into higher ones or triggering unintended consequences like IRMAA surcharges.
A series of smaller, consistent conversions over several years is often more effective than one large conversion. This approach allows retirees to take advantage of lower tax rates while maintaining control over their total income each year.
Social Security changes the equation
Once Social Security benefits begin, the window becomes more complicated. Depending on total income, up to 85% of Social Security benefits can become taxable. That additional income reduces the space available for low-tax conversions.
For some retirees, this means the most valuable conversion years occur before claiming benefits. Delaying Social Security not only increases the monthly benefit but may also extend the window for lower-tax Roth conversions.
Timing matters
The Roth conversion window is not defined by a single rule. It is shaped by multiple moving parts. Retirement timing, Social Security decisions, account balances, and future RMDs all play a role. Because of that, two retirees with similar savings can have very different opportunities depending on when they stop working and when they begin taking benefits.
Missing this window does not mean Roth conversions are no longer possible, but it often means paying higher taxes on those conversions later.
Bottom line
The years between retirement and the start of Social Security and RMDs can offer a unique opportunity to manage taxes. For many retirees, this window is shorter than expected and easy to overlook.
When used thoughtfully, Roth conversions during this period can reduce future taxes, shrink required distributions, and provide more flexibility later in life to grow your wealth. Because the math depends on income, account size, and timing, this is a strategy that often benefits from careful financial planning. Running the numbers in advance can help ensure you take advantage of the window while it is still open.
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