Tax-Efficient Withdrawal Sequencing in Retirement: Should You Tap Taxable Accounts, Roths, or 401(k)s First?

Most retirees are told the same thing: spend down your taxable brokerage accounts first, then your traditional IRA or 401(k), and save your Roth for last. It sounds logical. In practice, it quietly hands a larger tax bill to millions of retirees each year.

The problem isn’t the rule itself—it’s treating it as universal. Your optimal withdrawal sequence depends on your account balances, current tax bracket, Social Security timing, and when required minimum distributions (RMDs) will kick in. Research from T. Rowe Price found that retirees who tailored their withdrawal strategy—rather than following conventional order—saved $35,000 in federal taxes and left $106,000 more to heirs in one modeled case study. Studies from the TIAA Institute suggest strategic sequencing can extend portfolio longevity by multiple years, with total lifetime tax savings reaching $30,000–$100,000 or more depending on account size.

This article breaks down how each account type is taxed, where conventional sequencing breaks down, and which strategies actually reduce your lifetime tax burden.

This article is for informational purposes only and does not constitute personalized tax, legal, or financial advice. Consult a CPA or CFP before implementing any withdrawal strategy.

Understanding Your Three Account Types and Their Tax Treatment

Before choosing a withdrawal order, you need to understand exactly how each account type is taxed. They are not interchangeable.

Taxable Brokerage Accounts

These accounts are funded with after-tax dollars. You already paid income tax on the money going in. When you withdraw, you owe capital gains tax only on the growth—not the principal. Long-term capital gains rates (for assets held over one year) are 0%, 15%, or 20% depending on your income. For most retirees, this rate is lower than their ordinary income tax rate.

The ongoing drag: taxable accounts generate taxable events every year through dividends, interest, and short-term gains, even if you don’t sell anything. That’s why conventional advice says to drain them first—to stop the annual leakage.

Tax-Deferred Accounts (Traditional IRA, 401(k), 403(b))

Contributions go in pre-tax. The balance grows tax-deferred. Every dollar you withdraw is taxed as ordinary income at your federal bracket—currently ranging from 10% to 37%. These accounts also carry a critical constraint: required minimum distributions (RMDs) begin at age 73 (or age 75 if you were born after 1960), under the SECURE 2.0 Act. Skipping or underwithdrawing an RMD triggers a 25% excise tax on the shortfall.

Tax-Free Accounts (Roth IRA, Roth 401(k))

Contributions are made with after-tax dollars. Qualified withdrawals—meaning you’re at least 59½ and the account has been open for five or more years—are completely tax-free, including all growth. Roth IRAs have no RMDs during your lifetime. Roth 401(k)s are subject to RMDs, though rolling them into a Roth IRA eliminates that requirement.

Health Savings Accounts (HSAs)

HSAs offer triple tax benefits: tax-deductible contributions, tax-free growth, and tax-free withdrawals for qualified medical expenses. After age 65, non-medical withdrawals are taxed as ordinary income (no 20% penalty), making them function like a traditional IRA for non-medical spending. For retirees with HSA balances, these are highly valuable funds to preserve for healthcare costs first.

The Conventional Withdrawal Sequence: Taxable → Tax-Deferred → Roth

The standard approach has a straightforward rationale: let tax-advantaged accounts compound without interruption for as long as possible. Taxable accounts produce annual tax drag through dividends and capital gains distributions, so eliminating that drag first is logical. And the Roth—the most tax-efficient account you own—benefits most from decades of uninterrupted tax-free growth.

TIAA Institute research supports this logic at the broad level, noting that “models suggest this withdrawal strategy might help a retiree’s financial portfolio last a few years longer than a strategy of withdrawing from retirement accounts first.”

But the model has a critical blind spot: it ignores what happens when large traditional IRA and 401(k) balances sit untouched for 8–10 years while taxable accounts are depleted, and then RMDs force large taxable withdrawals beginning at age 73.

Why Standard Sequencing Breaks Down: RMDs and Tax-Bracket Creep

Here is the core problem. If you retire at 65 with $1.2 million in a traditional 401(k) and follow conventional sequencing, that balance keeps growing untouched. Assume a conservative 5% annual return. By age 73, that account could exceed $1.7 million. The IRS RMD for a 73-year-old with a $1.7 million balance is approximately $63,000, based on the Uniform Lifetime Table divisor of 26.5.

Add Social Security—say $28,000 per year—and you’re looking at $91,000 in gross income before you’ve spent a dollar from savings voluntarily. That pushes a single retiree well into the 22% federal bracket. A married couple with two Social Security checks could hit the 24% bracket or higher.

Meanwhile, in years 65–72—before RMDs begin and potentially before full Social Security—many retirees have unusually low taxable income. If you’re living on taxable account withdrawals (mostly return of principal and long-term gains taxed at 0%–15%) and haven’t claimed Social Security yet, your federal tax liability can be minimal. Those are years when you could have been converting traditional IRA funds to Roth at 10%–12% rates. Instead, under conventional sequencing, those low-bracket years go unused.

The result: higher taxes later, fewer tax-free assets, and larger RMDs that compound the problem each year. This is what tax planners call tax-bracket creep.

➤ Free Guide: 5 Ways To Automate Your Retirement

Strategic Tax-Efficient Withdrawal Approaches That Work Better

These strategies are not mutually exclusive. Most retirees benefit from combining two or more.

1. Bracket-Smoothing: Draw from Tax-Deferred Accounts Early

Rather than waiting for RMDs to force large traditional IRA withdrawals, take modest withdrawals in your early retirement years (ages 65–72) to fill lower tax brackets intentionally. The goal is to keep total taxable income near the top of the 12% or 22% federal bracket each year, smoothing your tax burden across decades rather than spiking it at age 73.

Example: A married couple filing jointly with $80,000 in annual expenses retires at 65. They have $900,000 in traditional IRAs, $200,000 in Roth, and $400,000 in taxable accounts. Instead of living entirely on the taxable account, they withdraw $40,000 per year from the traditional IRA through age 72. This reduces the IRA balance, shrinks future RMDs, and keeps their tax rate at 12%. T. Rowe Price’s modeling of a similar scenario found this approach kept the couple in the 10% bracket for eight additional years compared to conventional sequencing.

2. Roth Conversion Ladder

A Roth conversion moves money from a traditional IRA to a Roth IRA. You pay ordinary income tax on the converted amount in the year of conversion. The benefit: future growth and withdrawals from the Roth are completely tax-free, and those funds no longer generate RMDs.

The optimal window for Roth conversions is typically ages 60–72: after you’ve stopped working (lower income), before Social Security begins (lower income), and before RMDs begin (avoiding RMD stacking). Converting $20,000–$50,000 per year during this window—while staying within your target bracket—can dramatically reduce your lifetime RMD burden.

Key rule: To withdraw converted funds tax- and penalty-free, each conversion must age five years. Plan your ladder accordingly if you’re under 59½.

3. Multi-Account Annual Withdrawal

Rather than fully depleting one account type before touching another, draw from all three account types each year in proportions that manage your tax bracket. Morningstar’s analysis explicitly recommends this approach: “it will often be a good idea to pull money from multiple account types during each year of retirement.”

A practical split might look like this for a year when your RMD is $45,000, you need $75,000 total, and you want to stay under the 22% bracket ceiling:

• Take the required $45,000 RMD from your traditional IRA (mandatory)
• Supplement with $20,000 from your Roth IRA (tax-free, doesn’t affect bracket)
• Pull $10,000 from taxable account (low capital gains rate, or possibly 0% if income is below threshold)

4. Step-Up Basis Planning for Appreciated Taxable Assets

If you hold highly appreciated securities in a taxable account—say, $300,000 in unrealized long-term gains—selling those shares triggers immediate capital gains tax even at favorable rates. If you have sufficient funds elsewhere (Roth or traditional IRA), consider delaying the sale of appreciated taxable assets until death. Heirs receive a step-up in cost basis to the fair market value at the date of death, potentially eliminating all embedded capital gains tax on those shares.

This strategy makes most sense for retirees who intend to leave assets to heirs rather than spend them down, and who have other sources to fund retirement income.

Special Situations Where Standard Sequencing Breaks the Most

Medicare IRMAA Surcharges

Medicare Part B and Part D premiums increase for higher-income beneficiaries under Income-Related Monthly Adjustment Amounts (IRMAA). For 2024, surcharges begin at a modified adjusted gross income (MAGI) of $103,000 for single filers and $206,000 for married couples filing jointly. A large traditional IRA withdrawal or Roth conversion that pushes your MAGI over these thresholds can add $500–$5,000+ per year in Medicare premiums, effectively raising the marginal cost of that withdrawal.

Roth IRA withdrawals do not count toward MAGI for IRMAA purposes. Qualified distributions from a Roth have no effect on your Medicare premium calculation.

Social Security Taxation Thresholds

Up to 85% of Social Security benefits become taxable if your combined income (adjusted gross income + nontaxable interest + half of Social Security) exceeds $34,000 (single) or $44,000 (married filing jointly). Traditional IRA and 401(k) withdrawals count toward this calculation. Roth withdrawals do not. If you’re near these thresholds, substituting Roth withdrawals for traditional IRA withdrawals can reduce the taxable portion of your Social Security benefit.

Charitable Intent

If you plan to leave money to charity, the tax math shifts. Traditional IRAs are often the most tax-efficient asset to give to charity, because charities don’t pay income tax on the distributions. Your heirs, who would owe ordinary income tax on inherited IRA withdrawals, are better off receiving Roth accounts or stepped-up taxable assets. Qualified Charitable Distributions (QCDs) allow taxpayers age 70½ or older to transfer up to $105,000 per year (2024 limit, indexed for inflation) directly from a traditional IRA to charity, satisfying your RMD and excluding the amount from taxable income entirely.

Early Retirement Before Age 59½

Standard retirement account withdrawals before age 59½ carry a 10% early withdrawal penalty on top of ordinary income tax. Two strategies avoid this:

• Rule 72(t) Substantially Equal Periodic Payments (SEPP): Allows penalty-free IRA withdrawals before 59½ if you commit to a fixed payment schedule for the longer of five years or until you reach 59½.
• Roth conversion ladder: Convert traditional IRA funds to Roth each year. Wait five years per conversion, then withdraw the converted principal tax- and penalty-free. This requires advance planning—ideally starting conversions several years before you need the funds.

What to Do Next: Building Your Withdrawal Plan

Step 1: Map Your Account Balances

List the current balance in each taxable, traditional IRA/401(k), and Roth account. Then use the IRS Uniform Lifetime Table to calculate your projected RMD at age 73 based on current balances grown at an assumed rate of return (3%–6% is a reasonable conservative range). Seeing a $50,000–$80,000 forced annual distribution puts the urgency of early planning into sharp focus.

Step 2: Project Your Annual Income in Retirement

Build a year-by-year income estimate covering:

• Annual living expenses
• Social Security start date (62, 67, or 70—each significantly changes monthly benefit and taxation timing)
• Pension income, if any
• Part-time work or business income, if planned
• RMD start year and estimated amount

Identify the years with the lowest projected taxable income—typically ages 60–72—as your primary window for Roth conversions and bracket-filling withdrawals.

Step 3: Model Two Scenarios Side by Side

Compare conventional sequencing (taxable → traditional → Roth) against a bracket-smoothing or Roth-conversion approach using tax planning software or a CPA’s projections. Quantify the estimated difference in lifetime federal taxes paid. For retirees with $500,000 or more in tax-deferred accounts, the difference often exceeds $40,000–$80,000 in present-value terms.

Step 4: Consult a CPA or CFP Before Implementing

Withdrawal sequencing interacts with state income taxes, deductible expenses, capital loss carryforwards, net investment income tax, and estate planning considerations. A one-time tax projection with a qualified professional costs far less than the tax drag from an unoptimized sequence applied over 20–30 years.

Step 5: Review Annually

Optimal withdrawal sequencing is not a set-it-and-forget-it decision. Reassess each year when:

• Tax law changes (the Tax Cuts and Jobs Act provisions are scheduled to expire after 2025, which would raise rates in most brackets)
• One spouse dies, changing filing status from married to single and compressing tax brackets significantly
• You receive an inheritance or large capital gain
• Medicare or Social Security eligibility changes your income picture
• Account balances shift substantially due to market performance

Key Takeaways

• The conventional taxable-first sequence is a starting point, not a fixed rule. It often creates larger tax bills later by leaving traditional IRA balances untouched until RMDs force large, bracket-pushing withdrawals at age 73+.
• Early retirement years (ages 60–72) are typically your best window to withdraw from or convert traditional IRA/401(k) funds at lower tax rates—before Social Security and RMDs compound your taxable income.
• Roth conversions during low-income years can shift future distributions from 22%–24% ordinary income rates to 0% tax-free withdrawals.
• Roth withdrawals do not count toward MAGI for Medicare IRMAA surcharges or Social Security taxation thresholds—a meaningful advantage in certain income ranges.
• Appreciated taxable assets may be worth holding until death for the step-up in cost basis, if other income sources are sufficient.
• Research from T. Rowe Price, the TIAA Institute, and Morningstar consistently shows tailored sequencing can save $30,000–$100,000+ in lifetime taxes for retirees with moderate-to-large retirement account balances.