Which Accounts to Tap First: A Tax-Smart Withdrawal Order

The default that works most of the time

If you have spent any time reading about retirement income, you have met the standard withdrawal order: spend from taxable accounts first, then tap your tax-deferred accounts like a traditional IRA or 401(k), and leave your Roth for last. It is repeated so often, and for such good reasons, that it has hardened into something close to gospel.

The logic is genuinely sound. Money in a taxable brokerage account is already being taxed every year on its dividends and interest, so it is the least efficient place to let assets sit. Spending it first stops that annual drag. Meanwhile, your traditional IRA and 401(k) keep growing tax-deferred — every year you delay touching them is another year of compounding the government hasn't taken a cut from yet. And your Roth, the one account that grows and comes out entirely tax-free, is the most valuable dollar you own. It deserves to be the last thing you spend, both because it keeps compounding tax-free and because, if you never get to it, your heirs inherit it on extraordinarily favorable terms.

So the sequence is a fine place to start. The trouble begins when people treat a sensible default as an iron rule and follow it straight off a cliff.

What the default quietly ignores

The standard order optimizes for one thing: keeping tax-advantaged money growing as long as possible. What it does not do is manage your tax bracket across the decades — and bracket management is where most of the real money is won or lost.

Consider what happens to the obedient retiree. She spends down her taxable account over her first decade of retirement, touching her IRA as little as possible. Her traditional balance, untouched and compounding, swells. Then she turns 73, and required minimum distributions arrive whether she wants the money or not. Suddenly she is forced to pull large sums from a now-enormous IRA, and those distributions stack on top of her Social Security and pension, pushing her into a higher bracket than she ever occupied. The very discipline she was praised for created the problem.

This is the central flaw in following the order too faithfully: it can convert today's small, voluntary tax bills into tomorrow's large, mandatory ones. The account that felt safest to leave alone becomes a tax time bomb.

The gap years: the exception that should change your plan

The most important exception arrives early, in the window between when you stop working and when Social Security and RMDs begin. For many people that is a stretch of several years with unusually low taxable income — often the lowest of their adult lives.

Those gap years are a gift, and the standard order squanders them. While the textbook says to live off taxable money and leave the IRA alone, the smarter move is frequently the opposite: deliberately pull from your tax-deferred account, or convert some of it to Roth, specifically to fill up the lower tax brackets while they are cheap. You are paying a 10 or 12 percent toll now to avoid a 22 or 24 percent toll later, and you are shrinking the IRA balance that would otherwise have detonated as RMDs.

This does not mean abandoning taxable spending entirely. It means blending — using some taxable money for living expenses while layering in just enough tax-deferred withdrawals or conversions to "top off" the bracket you are willing to occupy. Done well, it flattens your lifetime tax bill instead of front-loading the cheap years and back-loading the expensive ones.

Three more places the order should bend

Beyond the gap years, a handful of situations argue for breaking sequence.

Looming RMDs. If your traditional balance is large enough that future required distributions will clearly push you into a high bracket, you may want to begin drawing it down — or converting it — well before 73, even while you still have taxable money sitting there. Better to smooth the income across many years than to absorb a forced spike.

Medicare and the IRMAA cliffs. Once you are on Medicare, your premiums are tied to your income from two years prior, and they jump in hard steps rather than gentle slopes. A withdrawal that nudges you one dollar over a threshold can cost you hundreds in surcharges. That makes the tax-free Roth dollar especially precious in any year you are flirting with a cliff — sometimes it is worth tapping the Roth out of sequence simply to keep reported income under a line.

The basis step-up for heirs. The standard order says spend taxable assets to zero, but appreciated holdings in a taxable account receive a step-up in cost basis at death, wiping out the embedded capital gain for your heirs. If leaving a legacy matters to you, draining that account to the bottom can quietly hand the IRS gains you could have erased. Sometimes the better bequest is the taxable account, not the IRA.

How to actually use the sequence

Treat the taxable-then-deferred-then-Roth order as your baseline, not your blueprint. Start there, then run your situation through three questions. Are you in a low-income window right now that you should be exploiting? Is your traditional balance heading toward an RMD problem? And are there income thresholds — IRMAA, the next bracket, the level where more of your Social Security becomes taxable — that you can steer around with a thoughtful mix of accounts?

For most retirees the answer is some hybrid: spend mainly from taxable in the early years, but blend in deliberate tax-deferred withdrawals or Roth conversions to use up cheap bracket space, then lean on the Roth in the years you most need to control reported income. The goal is not to honor the rule. It is to pay the lowest tax across your whole retirement — and the way you get there is by knowing, precisely, when the rule deserves to be set aside.