The Retirement Withdrawal Order Strategy: Which Account to Tap First (and Why It Matters)

Most retirees with three types of accounts — a traditional IRA or 401(k), a Roth IRA, and a taxable brokerage — face a question every year that feels simple but isn't: which account do I withdraw from first?

The instinct is usually to preserve the tax-free Roth money as long as possible and spend down the taxable accounts first. This feels logical. It is often wrong.

The order you withdraw from your accounts determines how much of your income is taxable, whether your Social Security gets hit by the torpedo, whether you qualify for the 0% capital gains bracket, whether you cross an IRMAA Medicare cliff, and ultimately how much of your wealth survives versus goes to the IRS over a 20–30 year retirement. Getting this wrong by even $20,000 per year in the wrong account can cost $50,000 to $150,000 in unnecessary taxes over time.

The Three Core Strategies

Strategy 1: Traditional First (the common default)

This is what most people do intuitively: spend the traditional IRA and 401(k) first, let the Roth grow tax-free as long as possible, and use the taxable brokerage as an intermediate buffer.

The appeal makes sense. Your traditional accounts will be taxed eventually — when you pull them out or when the IRS forces you to via RMDs at age 73. Why not spend them down on your own terms?

The problem: this strategy often generates more ordinary income than necessary in the early retirement years, when you have the most control. If your traditional balance is $800,000 and you're pulling $60,000 per year, you're generating $60,000 in ordinary income — likely pushing you into the 22% bracket — even though you have tax-free Roth money sitting idle.

Strategy 2: Roth First (the tax-preservationist approach)

Some advisors recommend using Roth funds first to preserve the traditional IRA balance for longer compounding. The logic: more money in a tax-deferred account earning returns before being taxed is better than a smaller account.

This sounds appealing, but it has a critical flaw: it depletes your most tax-flexible asset first. Roth money is uniquely valuable precisely because it doesn't count as income — it doesn't trigger Social Security taxation, doesn't affect IRMAA, and can fill gaps without tax consequences. Using it up early means you lose that flexibility in your 70s and 80s, when your income situation is less predictable.

The Roth First strategy also doesn't help your traditional IRA shrink faster — it actually lets the traditional balance compound longer, which means larger RMDs when they eventually kick in at 73.

Strategy 3: Tax-Optimal (filling brackets efficiently)

The optimal withdrawal sequence in most cases is a blend, driven by your actual tax brackets each year:

1. Satisfy RMDs first. Required Minimum Distributions are not optional. Beginning at 73, the IRS mandates a minimum annual withdrawal from your traditional IRA based on your balance divided by a life expectancy factor. These withdrawals are fully taxable ordinary income. Plan around them — don't ignore them.

2. Harvest capital gains at 0%. If your taxable ordinary income stays within the 12% bracket, federal long-term capital gains are taxed at 0%. In 2026, this means a married couple can have up to $100,800 in taxable income (after deductions) and owe nothing on long-term gains. If your taxable brokerage account has appreciated positions, this is the window to sell them tax-free.

3. Fill the 12% bracket from traditional. The standard deduction in 2026 is $32,200 for married filing jointly (plus $6,000 per person at age 65+, so $44,200 for a couple both over 65). This creates a zero-tax floor for traditional withdrawals. Above that, you can fill the entire 12% bracket — up to $100,800 in taxable income for MFJ — at 12 cents per dollar. That is remarkably cheap money to move out of a tax-deferred account.

4. Cover remaining spending from Roth. Once you've filled your low-rate traditional withdrawal and harvested your 0% capital gains, cover whatever spending remains with Roth — completely tax-free, no effect on SS taxation, no IRMAA impact.

A Real-World Example

Consider a married couple, both age 65, with $900,000 in a traditional IRA, $120,000 in a Roth IRA, and $180,000 in a taxable brokerage (60% cost basis). They need $80,000 per year in spending and collect $46,000 combined in Social Security.

Traditional First:

• They pull $34,000 from the traditional IRA to cover the gap ($80k spending - $46k SS)
• But Social Security is now partially taxable because provisional income = $34,000 + $23,000 (50% of SS) = $57,000, above the $44,000 MFJ threshold
• A portion of SS becomes taxable, pushing effective income higher
• They might face an effective marginal rate of 22%+ on some of those dollars

Tax-Optimal:

• They take their $46,000 SS, of which $0–$6,800 might be taxable (depending on provisional income)
• They take $10,000 from the traditional IRA — well within the standard deduction, so $0 in federal tax
• They harvest $24,000 in capital gains from the taxable brokerage at 0% (taxable income well below $100,800 after deductions)
• The remaining $0 gap is covered because SS + traditional + gains totals $80,000
• Total federal tax: dramatically lower, possibly near zero

The difference in federal taxes in a single year can be $5,000–$12,000. Over 20 years, that gap compounds into six figures.

The Role of Required Minimum Distributions

A conversation about withdrawal order is incomplete without understanding RMDs, because they fundamentally alter the math starting at age 73.

At 73, the IRS requires you to withdraw a minimum amount from your traditional IRA each year. The calculation: your December 31st balance divided by a life expectancy factor from IRS Publication 590-B. At age 73, that divisor is 26.5 — meaning roughly 3.8% of your traditional balance must come out each year.

Here is the math problem: if you have $1,000,000 in a traditional IRA at age 73 earning 6%, the balance grows to $1,060,000 by year-end. Your RMD is about $1,000,000 / 26.5 = $37,736. But the account grew by $60,000 and you only withdrew $37,736. The balance increases. The next year's RMD is higher. This compounds.

By age 80, a $1 million traditional IRA under these assumptions can become $1.3 million, with annual RMDs over $65,000 — fully taxable, mandatory, no flexibility. Add Social Security, pension, or other income, and you're looking at significant ordinary income regardless of what you want to do.

This is why the withdrawal order matters most in the decade before RMDs begin. The years from retirement to age 73 are your last window to voluntarily control your taxable income. Use them to whittle down the traditional balance — either through strategic withdrawals at 12% or through Roth conversions (filling the same bracket but moving money to tax-free rather than spending it).

The Social Security Torpedo and Withdrawal Order

The withdrawal order also determines whether you get hit by the Social Security tax torpedo.

Social Security benefits are taxed based on "provisional income" — your adjusted gross income plus tax-exempt interest plus 50% of your Social Security benefit. Once provisional income exceeds $32,000 (married filing jointly) or $25,000 (single), your SS starts to become taxable. Once it exceeds $44,000 (MFJ) or $34,000 (single), up to 85% of your benefit is taxable.

The torpedo effect: each dollar of traditional IRA withdrawal raises your provisional income by $1, which raises your taxable SS income by $0.85, for a total taxable income increase of $1.85. Your effective marginal rate on that dollar is your bracket rate × 1.85 — which in the 22% bracket means 40.7%.

The solution is to limit traditional withdrawals to amounts that keep provisional income below the upper SS threshold. Roth withdrawals — which don't count toward provisional income — can fill the gap without triggering the torpedo.

IRMAA: The Two-Year Lookback Problem

One more factor: Medicare IRMAA surcharges.

If your Modified Adjusted Gross Income exceeds the IRMAA thresholds ($109,000 single / $218,000 MFJ in 2026), you pay additional Medicare Part B and Part D premiums — and these surcharges are based on income from two years prior.

This means a decision you make today about how much to withdraw from your traditional IRA affects your Medicare costs in two years. Take $50,000 too much from your traditional IRA in 2026, and you might cross an IRMAA cliff in 2028, costing you an extra $1,000–$5,000 per year for as long as that income year remains in the lookback window.

Roth withdrawals and capital gains below the 0% threshold don't affect IRMAA. This is another reason why the optimal strategy often relies heavily on Roth and 0%-rate taxable gains rather than traditional IRA distributions.

When Each Strategy Makes Sense

Traditional First works when:

• Your traditional IRA balance is relatively small and RMDs won't be a problem
• You expect tax rates to increase significantly in the future
• Your Roth balance is very large and you have no concerns about depleting it
• You have significant current deductions (medical, charitable) that will shelter income

Roth First makes sense when:

• You expect to leave the Roth to heirs who will benefit from tax-free inherited Roth withdrawals
• Your traditional IRA is already small and you want to preserve it for a specific planned large expense
• You're in a high-tax state and want to minimize all taxable income

Tax-Optimal is usually best when:

• You have a mix of all three account types (the typical scenario)
• You're in the early retirement years before RMDs begin
• Your taxable income is naturally low (before SS begins, after work ends)
• You have appreciated taxable brokerage positions you'd like to sell

The Practical Steps

Here is a simplified framework for each year:

1. Calculate your RMD (if 73+) and treat it as mandatory income.
2. Determine your provisional income floor — pension + RMD + 50% of SS. Check where this lands relative to the SS thresholds.
3. Find your bracket space — how much room remains in the 12% bracket (or 22%, if you're comfortable there) after your floor income.
4. Plan traditional IRA withdrawals to fill that bracket space. Stay below the SS torpedo threshold if possible.
5. Harvest taxable gains at the 0% rate if your taxable income is still below the 12% bracket ceiling.
6. Cover remaining spending from Roth.
7. Check IRMAA — make sure your planned income for this year won't create a cliff problem two years from now.

This is a decision that needs revisiting every year because your income mix, account balances, and tax law all change. The calculator above makes it fast to model a given year's tradeoffs.

Common Mistakes

Taking too much from traditional in early retirement. Many retirees, comfortable with their traditional IRA and uncertain about Roth rules, simply live on traditional withdrawals. This burns through the tax-deferred account quickly, leaves the Roth untouched, and misses the opportunity to harvest the 0% capital gains bracket from the taxable account.

Ignoring the taxable account entirely. The taxable brokerage account is often treated as a savings account. But it's also a tax-planning tool — it allows you to recognize gains (at 0%) or losses (for harvesting) in controlled ways. Not using this account strategically is leaving free money on the table.

Forgetting the two-year IRMAA lag. Retirees often focus on current-year taxes and forget that income this year affects Medicare premiums in two years. A large Roth conversion or traditional withdrawal can be perfectly tax-efficient for income tax purposes and still create a significant IRMAA problem later.

Waiting too long to start planning. The best time to think about withdrawal order sequencing is before you retire. The decade from 55 to 65 is when you can influence your account type balance through contributions, conversions, and savings decisions. By the time RMDs begin, your options are more constrained.

The Bottom Line

Withdrawal order is not set-it-and-forget-it. It requires active planning every year — assessing your account balances, income sources, current and projected tax brackets, and Medicare situation. The tax savings from getting this right compound over decades.

The good news: the framework is not complex. Fill the 12% bracket from traditional. Harvest 0% gains from taxable. Cover the rest with Roth. Repeat. Check IRMAA. Watch for the SS torpedo. Adjust when income changes.

The calculator linked above models all three strategies across your full planning horizon with your specific numbers. Run it with your current balances and spending needs — the difference between strategies is often eye-opening.