What's the Tax-Minimizing 401(k) Withdrawal Sequence in Retirement?

Why Is the Standard Withdrawal Sequence Oversimplified?

The conventional wisdom on retirement withdrawal sequencing: taxable accounts first, then traditional IRA/401k, then Roth last (preserving tax-free growth the longest).

This is directionally reasonable but misses two important nuances:

1. Traditional account distribution before RMDs. Voluntarily taking traditional IRA distributions before RMDs are required — while they are still modest relative to the bracket ceiling — can reduce the RMD burden later and extend Roth conversion windows. Waiting for the RMD to force large distributions often pushes income into higher brackets.

2. Roth conversion during the gap. The years between retirement and RMD start are the best window for filling lower brackets with Roth conversions — not necessarily the best time to spend down taxable accounts first.

How Did SECURE 2.0 Change the Withdrawal Sequencing Calculation?

SECURE 2.0 raised RMD ages to 73 (born 1951-1959) and 75 (born 1960+) and eliminated RMDs for Roth 401(k)s. These changes have two implications for withdrawal sequencing:

1. Longer pre-RMD window: A 60-year-old retiring in 2026 who was born in 1966 has a 15-year window before RMDs at 75. That's 15 years of potential Roth conversions at lower brackets before forced traditional distributions begin.

2. Roth 401(k) as estate vehicle: Without RMDs, Roth 401(k)s can compound indefinitely for heirs. This makes them more valuable as late-life and estate assets — they don't need to be tapped until other accounts are exhausted.

Withdrawal sequencing in 2026 is more favorable for tax management than under old RMD rules.

Want to See Your Optimal Withdrawal Sequence?

The right sequence for you depends on your account mix, Social Security timing, pension income, and whether you're in the Roth conversion window. Getting it wrong by even 5 years costs real money in lifetime taxes.

I built myaifinancialplan.com to calculate your specific withdrawal sequence — including Roth conversion opportunities, RMD projections, and lifetime tax comparison versus the naive sequence. Start free at myaifinancialplan.com.