How Corporate Executives With $5 Million 401(k)s Avoid the Top Tax Bracket in Retirement

A corporate vice president walks out of the office at 60 with $5 million in a traditional 401(k), a pension, and Social Security on the horizon. It feels like the finish line. The tax code says otherwise. Every dollar in that 401(k) is fully taxable on the way out, and the IRS will eventually force the spigot open whether the retiree needs the money or not.

This is the classic high earner trap. The same pre-tax deferrals that built the balance now create a tax liability that compounds alongside the portfolio. A recent Bogleheads forum thread captured the dilemma in one line from a retired executive: “I spent 30 years deferring taxes, and now I realize I just deferred them into a higher bracket.”

The Situation in One Glance

• Age: 60, retiring this year, married filing jointly
• Traditional 401(k) balance: $5 million
• Other income at 65+: Social Security plus a corporate pension
• Projected balance at age 73 (6% growth): roughly $8.5 million
• Projected first-year RMD: about $320,755 (8.5M divided by the 26.5 IRS factor)

Stack a $320,000 RMD on top of pension and Social Security income and the household lands squarely in the 32% federal bracket, which in 2026 begins at $403,551 for joint filers. It also triggers the upper IRMAA tiers, adding hundreds of dollars per month per spouse to Medicare premiums. The damage is permanent because RMDs continue every year for life.

Why Bracket Arbitrage Is the Whole Game

The single tension that drives this outcome is simple: pay tax now in the 24% bracket, or pay tax later in the 32% bracket. This single bracket choice outweighs asset location, Social Security timing, and market returns within reasonable ranges.

The 24% MFJ bracket runs all the way up to $403,551 in 2026, which is an enormous runway. A retiree with no W-2 income between 60 and 72 can voluntarily realize income in that band at a discount to what RMDs will eventually force. With Core PCE running near 129 and inflation still above the Fed’s 2% target, those bracket thresholds keep nudging higher each year, which actually widens the conversion window.

The back-of-napkin math is what makes this concrete. Converting $200,000 per year for 13 years moves $2.6 million out of the traditional account at a tax cost of roughly $624,000. Letting those same dollars sit and get taxed at 32% later costs about $832,000. The spread is roughly $208,000 in pure tax savings, before counting the IRMAA relief and the tax-free growth inside the Roth.

The Three Moves That Actually Move the Number

1. The Roth conversion ladder from 60 to 72. Convert roughly $200,000 per year, fill the 24% bracket, pay the bill from taxable savings (never from the converted balance). This shrinks the future RMD base and creates a tax-free bucket for legacy or large one-off expenses. It works best for retirees with cash outside the 401(k) to cover the tax. Drawback: a real check to the IRS every April for over a decade.
2. Net Unrealized Appreciation on company stock. If any portion of the 401(k) holds employer shares, a lump-sum in-kind distribution to a taxable brokerage means ordinary income tax applies only to the cost basis. The appreciation is later taxed at long-term capital gains rates, which top out well below 32%. This is a one-shot opportunity at separation from service. Miss the window and the entire balance reverts to ordinary-income treatment forever.
3. Qualified Charitable Distributions starting at 70.5. A retiree can route up to $108,000 per spouse in 2026 directly from the IRA to charity, satisfying RMDs while excluding the amount from AGI entirely. For charitably inclined households, this is the cleanest way to lower IRMAA, taxable Social Security, and the Medicare surtax in one step.

What to Do This Year

Run the conversion math before December 31 of the retirement year, because the first low-income year is the most valuable bracket space a retiree will ever see. With the federal funds rate at 3.75% and the 10-year Treasury near 4.4%, paying tax today on dollars that will compound tax-free for 25 years is one of the highest-return decisions in personal finance.

The common mistake: waiting until 73 to address RMDs. By then the balance has doubled, the bracket has locked in, and IRMAA surcharges have started. The retirees who keep the most are the ones who treat ages 60 through 72 as a 13-year tax planning project.