The Account You Spend From First in Your 60s Sets Your Real Retirement Tax Rate

A 62-year-old with $2.4 million faces the same question every retirement plan opens with: taxable, 401(k), or Roth — which comes out first? The answer most people inherit is to spend the taxable brokerage account first and leave the 401(k) and Roth to keep compounding. It sounds harmless, even tax-savvy. It is the most expensive default in retirement planning, and the cost has nothing to do with the growth lost by tapping the wrong account. It is about which tax rate the money eventually leaves at — and the single biggest of those rates is decided in the eleven years before the government starts forcing payouts.

The years you actually control

From 62 to the required minimum distribution wall, withdrawals are your choice. That ends the moment they become mandatory. RMDs force taxable payouts from a 401(k) or traditional IRA once you reach age 73, rising to 75 for people born in 1960 or later; Roth IRAs carry no required distribution at all. The money in a 401(k) cannot grow quietly into old age and then come out on your terms. It comes out at a rate the IRS sets, on a balance it had years to compound.

So the conventional order — taxable first, 401(k) second, Roth last — quietly does the opposite of what it advertises. By shielding the 401(k) from withdrawals, it lets the tax-deferred balance grow into a larger forced distribution, taxed as ordinary income at whatever bracket its own growth pushed you into. The deliberate alternative is to draw the 401(k) down in your 60s, filling the 10% and 12% brackets while you still can, so you convert wealth that would otherwise exit at 22%, 24%, or higher.

The tax torpedo that multiplies the bill

The specific reason a late-life 401(k) is so expensive is its interaction with Social Security. The IRS figures "provisional income" as your other income plus tax-exempt interest plus half your benefits. Once provisional income passes $32,000 for a married couple ($25,000 single), up to 50% of benefits become taxable; above $44,000 ($34,000 single), up to 85%. Inside that band, every additional dollar you pull from a 401(k) drags up to 85 cents of Social Security into taxable income along with it — one withdrawal dollar becomes $1.85 of taxable income. A retiree in the 22% bracket is effectively at 40.7% on each dollar drawn there; a 12%-bracket retiree at 22.2%.

This is why sequencing is the move. Near those thresholds, you draw Roth or taxable dollars instead of 401(k) dollars, because qualified Roth withdrawals do not count toward provisional income at all. And you use your early, low-income years — before claiming Social Security and before RMDs — to pull 401(k) money out and convert it to Roth at the cheap end of the bracket ladder, rather than feeding an ever-bigger forced distribution into the torpedo later.

Delay Social Security, spend the same years twice

The other lever stacks on top of the same empty years. Each year you wait past full retirement age, the Social Security benefit grows 8%, through age 70 — a 24% cumulative increase on an inflation-indexed payment that lasts for life. Researchers describe delaying the claim as buying an inflation-indexed annuity, and the numbers support treating it that way. The bridge years before you claim are low-income years by definition, which is precisely when 401(k) drawdowns and Roth conversions are cheapest. Delay the claim and drawdown the tax-deferred balance, and both levers are pulling from the same favorable window.

What the order is really worth

The six-figure claim in the headline is not a fixed number, but the modeling shows the order of magnitude. In one T. Rowe Price study of a couple with $2.5 million, drawing the tax-deferred accounts down in the 10%–12% brackets instead of following the taxable-first default added $169,000 to the after-tax amount left to heirs, about 12%. In a Fidelity comparison, the taxable-first sequence paid roughly $56,000 in lifetime federal tax versus about $34,000 for a proportional approach — and stretched the portfolio about a year longer. The outcome moves with three things you control: how much of your $2.4 million sits in the 401(k), when you claim Social Security, and what you draw from which account in your 60s.

The principle underneath is a rate arbitrage that has a window. Every dollar you move out of the 401(k) at 12% in your 60s is a dollar not pulled at 22–24% plus the Social Security torpedo in your late 70s; every year you defer claiming buys a higher, inflation-protected floor. The spend order matters for exactly one reason — the years when you control your own tax rate run from 62 to 73 or 75, and they pass once. Decide the order on purpose before you hit the wall, rather than inheriting the default.