‘I Find that Advice Questionable’: Is It Time to Rethink the Rule of Tapping Your Roth Last — After Your 401(k) and IRA?

Why It Matters

Withdrawal sequencing determines retirees’ effective tax rate, Medicare costs, and estate outcomes, directly impacting net retirement income.

Key Takeaways

• Roth withdrawals can lower taxable income in retirement
• RMDs start at age 73, force taxable distributions
• Converting during market dips reduces future tax burden
• Medicare IRMAA thresholds triggered by higher income
• No limit on Roth conversion amount, but taxes apply

Pulse Analysis

Financial advisers have long promoted a hierarchy that drains taxable brokerage accounts first, then traditional 401(k)s or IRAs, and finally Roth IRAs. The logic rests on preserving tax‑free growth for as long as possible, but it overlooks the dynamic nature of a retiree’s tax bracket. When a distribution pushes income above the $25,000‑$34,000 thresholds, a portion of Social Security becomes taxable and Medicare’s IRMAA premiums can jump dramatically. By strategically tapping Roth assets or converting traditional balances before reaching those limits, retirees can smooth taxable income and protect ancillary benefits.

Roth conversions are especially compelling during market corrections. Selling depreciated securities to fund a conversion locks in a lower tax base, and the converted amount grows tax‑free thereafter. However, the conversion is irreversible and subject to a five‑year waiting period before penalty‑free withdrawals of the converted principal. Retirees must also weigh the immediate tax hit against the long‑term benefit of reducing future Required Minimum Distributions, which begin at age 73 and are fully taxable. Proper timing can therefore lower both ordinary income tax and the Medicare Part B and D surcharges tied to higher AGI.

Legislative updates further reshape the calculus. The One Big Beautiful Bill Act, enacted in July 2025, raises the SALT deduction cap and introduces a $6,000 senior deduction, effectively increasing after‑tax cash flow for many retirees. These changes, combined with the absence of a conversion limit, give high‑net‑worth individuals more flexibility to shift assets into Roth accounts without a hard ceiling. Savvy retirees now view the “Roth last” rule as a flexible guideline, tailoring withdrawal and conversion strategies to their unique tax profile, health‑care costs, and legacy goals.