When should retirees consider converting to a Roth IRA?

Retirees face a critical decision when managing their retirement savings: whether to convert their traditional IRA to a Roth IRA. This move can result in considerable long-term tax savings and estate benefits – but only if timed correctly. 

Understanding when a conversion makes sense—and when it doesn’t—is essential to preserving wealth and avoiding unnecessary tax burdens.

Traditional IRAs are funded with pre-tax dollars, and all withdrawals are taxed as ordinary income. Roth IRAs, on the other hand, are funded with after-tax dollars and allow tax-free withdrawals in retirement. 

Converting a traditional IRA to a Roth involves paying taxes now on the converted funds in exchange for future tax-free growth and withdrawals.

For retirees, especially those who find themselves in a temporarily lower tax bracket – typically in the years after retiring but before required minimum distributions (RMDs) begin – this can be a strategic opportunity to shift taxable income into a more favorable long-term position.

The ideal Roth conversion window: Ages 60 to 73

According to SmartAsset, the optimal period for Roth conversions generally falls between retirement (often age 60–65) and age 73, when RMDs kick in under current law. During these years, retirees often have reduced taxable income, especially if they delay Social Security and aren’t drawing from retirement accounts yet.

By converting during this window, retirees can “fill up” lower tax brackets—intentionally creating income up to the 12% or 22% tax bracket thresholds—without tipping into higher brackets. This can significantly reduce lifetime taxes, especially if large RMDs in later years would otherwise push them into higher brackets.

When it no longer makes sense

The benefits of Roth conversions decline with age. By age 80, the window for significant tax savings has usually closed. At this stage:

• RMDs are in full swing, increasing taxable income and limiting how much can be converted without hitting higher tax brackets.
• Shorter life expectancy reduces the time available to recoup the upfront tax cost of conversion.
• Cash flow needs may be more fixed, making large tax bills from conversions impractical.

However, Roth conversions may still be useful beyond age 80 for specific estate planning goals, such as reducing the tax burden for heirs who may be in higher tax brackets or minimizing the impact of future tax law changes.

Other Considerations:

• Medicare premiums (IRMAA): Conversions can increase modified adjusted gross income (MAGI), potentially triggering higher Medicare Part B and D premiums.
• Estate planning: Roth accounts are attractive to heirs because they inherit the account tax-free and can stretch withdrawals over 10 years.
• State taxes: Retirees in low-tax or no-tax states may benefit more from converting than those in high-tax states, depending on their future residency plans.