Tax-Efficient Withdrawal Order: Which Accounts to Tap First

Janet and Ed both retired at 67. They'd been careful savers — $400,000 in Ed's 401(k), $200,000 in Janet's Roth IRA, $150,000 in a joint brokerage account, and $40,000 in cash. Combined Social Security: $48,000 a year. They figured they were set.

At their first meeting with a new accountant, they asked a simple question: "Which account should we pull from first?"

The accountant spent two hours running projections. What she showed them was startling: the order they withdrew from their accounts could mean the difference between paying $320,000 in lifetime taxes or $140,000. Same money. Same spending. Same lifestyle. But $180,000 in tax savings — just by changing which bucket they reached into and when.

That's the power of withdrawal order. It's one of the most underappreciated decisions in retirement planning, and getting it wrong costs the average retiree tens of thousands of dollars.

The conventional wisdom (and why it's often wrong)

For decades, financial planners taught a simple rule: spend from taxable accounts first, then tax-deferred (401(k), Traditional IRA), then Roth last.

The logic seems sound. Taxable accounts generate annual taxes on dividends and capital gains whether you sell or not, so spend those down first. Tax-deferred accounts grow without annual taxes, so let them compound longer. Roth accounts grow completely tax-free, so save those for last — maximum tax-free growth.

This "conventional order" works in a textbook. In real life, it often fails — sometimes spectacularly.

Here's why. By draining taxable accounts first and letting the 401(k) grow untouched, Janet and Ed would arrive at age 73 with an even larger tax-deferred balance. Larger balance means larger Required Minimum Distributions. Those RMDs, combined with Social Security, would push them into the 22% bracket and beyond. Up to 85% of their Social Security would become taxable. They'd likely trigger IRMAA surcharges on Medicare premiums. And when they die, their children would inherit a bloated Traditional IRA subject to the 10-year distribution rule — potentially at peak earning years in the 32% or 37% bracket.

The conventional order protects the Roth but fattens the tax-deferred bomb. In many cases, that's exactly the wrong trade-off.

The dynamic approach that actually saves money

The tax-efficient strategy isn't a fixed order — it's a dynamic, year-by-year decision based on where your income falls relative to key tax thresholds.

The core principle: use tax-deferred withdrawals to fill low tax brackets, and use Roth withdrawals when income would otherwise push you into higher brackets. Taxable accounts serve as the flexible layer in between.

For Janet and Ed, this looks like the following in practice. Their Social Security of $48,000 puts them at about $40,800 in taxable income after the standard deduction (roughly 85% of Social Security is taxable at their income level). The 12% bracket for married filing jointly extends to about $96,950 in 2026. That leaves roughly $56,000 of room in the 12% bracket.

Their accountant's recommendation: withdraw $50,000–$55,000 from the 401(k) each year — enough to fill the 12% bracket nearly to the brim. Tax cost: about $6,000–$6,600 per year at 12%. This depletes the 401(k) gradually, reducing future RMDs.

In years when they need extra cash — a new roof, a trip to Europe, a medical expense — they pull from the Roth. Those withdrawals don't add to taxable income, don't affect Social Security taxation, don't trigger IRMAA. The Roth serves as the "stealth" income source that's invisible to the tax code.

The brokerage account fills gaps and covers smaller variable expenses. When they sell investments with long-term gains, much of those gains may qualify for the 0% capital gains rate because their taxable income (after standard deduction) stays within the lower brackets.

The 20-year comparison: naive versus optimized

Let's put real numbers to this. Assume Janet and Ed need $70,000 per year in after-tax spending (beyond Social Security), earn 6% annual returns, and face the 2026 tax brackets with modest inflation adjustments.

Naive approach (conventional order):

• Years 67–71: Drain brokerage account ($150,000) and cash ($40,000). 401(k) grows to ~$535,000 by age 73.
• Years 73+: RMDs start on the larger 401(k) balance. First RMD: ~$21,000. Combined with Social Security, total income pushes into 22% bracket. IRMAA triggered by age 76 as 401(k) balance peaks near $560,000 and RMDs grow.
• Roth preserved but 401(k) generates escalating tax burden.
• Estimated lifetime federal taxes (ages 67–87): ~$320,000.

Optimized approach (dynamic withdrawal):

• Years 67–72: Withdraw $50,000–$55,000 from 401(k) annually to fill 12% bracket. Supplement with brokerage sales at 0% capital gains rate. 401(k) shrinks to ~$200,000 by age 73.
• Years 73+: RMDs on the smaller balance are modest (~$8,000 initially). Combined income stays in or near 12% bracket. No IRMAA. Less Social Security taxation.
• Roth used strategically in high-need years to avoid bracket jumps.
• Estimated lifetime federal taxes (ages 67–87): ~$140,000.

The difference: approximately $180,000. That's not a typo. It's the cumulative impact of staying in lower brackets, avoiding IRMAA surcharges ($3,000–$5,000/year for a couple), reducing Social Security taxation, and leaving heirs a Roth instead of a tax-deferred time bomb.

How withdrawal order affects Social Security taxes

Social Security taxation has its own thresholds, and withdrawal order directly influences how much of your benefits get taxed. The IRS uses a measure called "combined income" (adjusted gross income + nontaxable interest + half of Social Security benefits) to determine taxation.

For married couples filing jointly: below $32,000 in combined income, Social Security is tax-free. Between $32,000 and $44,000, up to 50% is taxable. Above $44,000, up to 85% is taxable.

Here's the kicker: 401(k) withdrawals count toward combined income. Roth withdrawals do not.

If Janet and Ed pull $60,000 from their 401(k) in a given year, their combined income soars, and 85% of their $48,000 Social Security becomes taxable — that's $40,800 of additional taxable income. But if they pull $30,000 from the 401(k) and $30,000 from the Roth, their combined income drops significantly. Potentially only 50% of Social Security becomes taxable, saving thousands.

This interaction creates what tax professionals call the Social Security tax torpedo — a range where each additional dollar of 401(k) income effectively creates $1.50 or even $1.85 of taxable income. Managing withdrawal sources to stay below or above this torpedo zone is one of the most impactful things a retiree can do.

The RMD wrinkle at age 73

Starting at age 73, the IRS forces you to withdraw minimum amounts from tax-deferred accounts. You can't leave money in the 401(k) or Traditional IRA forever — the government wants its tax revenue.

This is precisely why the dynamic approach front-loads 401(k) withdrawals. By voluntarily pulling from the 401(k) in your 60s and early 70s (at 12% or less), you reduce the balance that RMDs are calculated on. Smaller balance means smaller forced withdrawals. Smaller forced withdrawals mean more control over your income — and your tax bracket — for the rest of your life.

Janet and Ed's accountant calculated that by drawing down the 401(k) aggressively between ages 67 and 72, they could reduce their age-73 RMD from $21,000 to about $8,000. That $13,000 reduction in mandatory income gives them far more flexibility in every subsequent year.

Some retirees go further and do Roth conversions during those early retirement years — converting 401(k) money to Roth even beyond what they need to spend. This shrinks the tax-deferred balance even faster and builds the Roth for truly tax-free income later. The conversions are taxable, but at the low rates available during the "gap years" between retirement and RMDs, the math almost always favors conversion.

What about the brokerage account?

Taxable brokerage accounts occupy a unique middle ground. They don't have RMDs, but they do generate annual taxable events — dividends, interest, and capital gain distributions whether you sell or not.

The smart approach: use the brokerage account tactically. Sell positions with long-term gains in years when your taxable income is low enough to qualify for the 0% long-term capital gains rate (roughly $96,700 for married filers in 2026). Harvest losses in down years to offset gains elsewhere. Hold tax-efficient investments (index funds, municipal bonds) in this account, and keep tax-inefficient investments (bonds, REITs) in tax-deferred or Roth accounts.

The brokerage account also offers a significant estate planning advantage: the step-up in cost basis at death. If Janet and Ed hold appreciated stock in their brokerage account and pass it to their children, the children inherit at the current market value — all the accumulated gains disappear for tax purposes. This doesn't happen with 401(k) or Traditional IRA assets, which are fully taxable to heirs.

For this reason, some advisors suggest holding your most appreciated investments in taxable accounts specifically for the step-up benefit, while spending down tax-deferred accounts during your lifetime.

Building your own withdrawal plan

There's no universal "right" order. The optimal strategy depends on your specific balances, income sources, tax bracket, state taxes, health insurance situation, and legacy goals. But here's a framework that works for most retirees.

Step 1: Map your income floor. Start with guaranteed income: Social Security, pensions, annuities. Calculate how this fills your tax brackets.

Step 2: Identify the bracket space. How much room remains in the 10% and 12% brackets? That space is valuable — fill it with tax-deferred withdrawals or conversions.

Step 3: Use Roth for the overflow. When spending needs exceed what you can pull from tax-deferred accounts without jumping brackets, use Roth. It's invisible income.

Step 4: Harvest from taxable accounts opportunistically. Sell appreciated positions when the 0% capital gains rate applies. Harvest losses in down markets.

Step 5: Revisit annually. Tax laws change, account balances shift, income fluctuates. The right withdrawal mix this year may not be right next year.

Janet and Ed's accountant updates their withdrawal plan every November. It takes one meeting per year and saves them roughly $9,000 annually in taxes they'd otherwise overpay.

That's $9,000 for a single conversation. It's probably the highest-returning hour in their financial life.

Want a personalized withdrawal strategy for your retirement accounts? Schedule a consultation with a retirement advisor who can model your specific situation and build a year-by-year plan.