Tax-Efficient Retirement Withdrawal Ordering Strategy

Most people spend decades accumulating retirement savings. Far fewer think about the order in which they draw those savings down --- and that ordering decision can easily mean a six-figure difference in lifetime taxes. The right withdrawal sequence depends on your mix of account types, your tax bracket now and in the future, and how Social Security and Medicare premiums interact with your income.

Key Takeaways

• The conventional order is taxable accounts first, then tax-deferred (IRA/401k), then Roth --- but a bracket-filling approach is usually better.
• The years between retirement and age 73 are a prime window for Roth conversions at low tax rates.
• Withdrawal decisions affect Social Security taxation, Medicare IRMAA surcharges, and future RMD size.
• Every dollar of unnecessary income can trigger cascading tax costs in retirement.

The Three Buckets

Most retirees have savings across three types of accounts, each taxed differently when you take money out.

The goal is to draw from these buckets in an order that minimizes your total lifetime tax bill --- not just this year’s bill.

The Conventional Withdrawal Order

The textbook rule is simple:

1. Taxable accounts first. Only the gains are taxed, and long-term capital gains rates (0%, 15%, or 20%) are lower than ordinary income rates. You also benefit from a step-up in basis at death for anything you do not spend.
2. Tax-deferred accounts second. Withdrawals are taxed as ordinary income. Delaying these lets the balances grow tax-deferred longer.
3. Roth accounts last. Withdrawals are tax-free and there are no RMDs during your lifetime. Roth money is the most powerful growth engine you have --- and the best asset to leave heirs.

This order works as a starting point, but strict adherence often leaves money on the table.

Why the Conventional Order Falls Short

Draining taxable accounts first and ignoring tax-deferred accounts until later can create a problem: when Required Minimum Distributions kick in at age 73 (or 75 for those born 1960+), those large tax-deferred balances generate mandatory taxable income that may push you into higher brackets, trigger Social Security taxation, and spike your Medicare premiums.

Example: Maria retires at 62 with $1.2 million in a Traditional IRA, $400,000 in a brokerage account, and $200,000 in a Roth IRA. If she spends only from her brokerage account until 73, her Traditional IRA (growing at 6%) could reach $2.4 million by the time RMDs begin. Her first-year RMD alone would be roughly $90,000 --- well into the 22% bracket and likely pushing her Social Security into 85% taxability.

The smarter approach: bracket-filling.

The Bracket-Filling Strategy

Instead of drawing from one bucket at a time, you manage your tax bracket each year by blending sources.

How It Works

1. Determine your target bracket for the year (often 12% or 22%).
2. Withdraw from your tax-deferred account to fill income up to the top of that bracket.
3. Pull any additional spending needs from taxable or Roth accounts (which do not add to your taxable income, or add at lower capital gains rates).

2025 and 2026 Bracket Thresholds (Married Filing Jointly)

Example (MFJ, 2025): A couple takes the $30,000 standard deduction. To fill the 12% bracket, they can have up to $96,950 in taxable income --- meaning they can withdraw about $126,950 from a Traditional IRA ($96,950 + $30,000 standard deduction) and pay no more than 12% on any of it. If they need more, they pull from Roth or taxable accounts.

The Roth Conversion Ladder

The years between retirement and RMD age are often your lowest-income years and your best opportunity to convert Traditional IRA money to Roth at low tax rates. This is the Roth conversion ladder.

Why Convert Early in Retirement?

• Lower brackets: No salary means lower marginal rates
• Smaller future RMDs: Every dollar converted is one less dollar subject to mandatory distributions
• Tax-free growth: Converted amounts grow tax-free in the Roth
• Legacy benefit: Roth accounts are the best inheritance --- beneficiaries pay no income tax

How Much to Convert Each Year

The target is typically the top of the 12% or 22% bracket, minus your other income. Many retirees have little income in the years before Social Security begins, creating a large conversion opportunity.

Example: A married couple has $20,000 in pension income and no other earnings. Their standard deduction is $30,800 (2026). They can convert approximately $78,400 of Traditional IRA to Roth ($99,200 bracket top minus the pension that exceeds the deduction), paying only 10-12% in tax. Without converting, that same money would eventually be distributed as RMDs --- potentially at 22% or higher and with Social Security taxation layered on top.

See: Roth Conversion Ladder and Roth Conversion (glossary)

Social Security Timing and Taxation

How and when you claim Social Security interacts directly with your withdrawal strategy.

How Social Security Is Taxed

Up to 85% of your Social Security benefits can be taxable based on “provisional income”:

Provisional Income = AGI + Tax-Exempt Interest + 50% of Social Security Benefits

These thresholds have never been adjusted for inflation since 1993. As a result, the vast majority of retirees now have at least some Social Security benefits taxed.

The Tax Torpedo

The Social Security tax torpedo is the zone where a single extra dollar of IRA withdrawal can cause $0.50 to $0.85 of previously tax-free Social Security to become taxable. This amplifies your effective marginal rate far beyond the bracket rate. Strategic withdrawal ordering is one of the best defenses.

Withdrawal Strategies to Minimize Social Security Taxation

• Use Roth withdrawals for spending above the provisional income threshold --- Roth distributions do not count as provisional income
• Do Roth conversions before claiming Social Security to shrink the Traditional IRA, reducing future taxable income
• Delay claiming Social Security to age 70 if possible --- this creates a larger Roth conversion window in the interim
• Use Qualified Charitable Distributions (QCDs) at age 70 1/2+ to satisfy RMDs without increasing AGI

See: Taxable Social Security Benefits Calculator

RMD Planning

Required Minimum Distributions begin at age 73 (for those born 1951-1959) or 75 (born 1960+) under SECURE 2.0. RMDs are calculated based on your account balance on December 31 of the prior year divided by a life expectancy factor.

Why RMDs Matter for Withdrawal Strategy

• RMDs set a floor on your taxable income from tax-deferred accounts --- you must take them whether you need the money or not
• Large tax-deferred balances mean large RMDs, which can push you into higher brackets
• Pre-retirement Roth conversions directly reduce future RMDs

RMD Reduction Strategies

1. Roth conversions before RMD age --- the single most effective lever
2. Qualified Charitable Distributions --- up to $108,000 per year (2025, indexed) can go directly from your IRA to charity and satisfy your RMD without appearing in AGI
3. Aggregate across accounts --- you can calculate your total Traditional IRA RMD and take it from a single IRA if that simplifies your plan
4. Still working? --- You can delay RMDs from your current employer’s 401(k) (not IRAs) until you actually retire

See: Required Minimum Distributions

Medicare IRMAA: The Hidden Tax on Retirement Income

Medicare Part B and Part D premiums increase if your MAGI from two years prior exceeds certain thresholds. These Income-Related Monthly Adjustment Amounts (IRMAA) function as a stealth tax on retirement income.

Planning tip: A large Roth conversion in the year you turn 63 affects your Medicare premiums when you turn 65. Plan IRMAA implications two years ahead of each conversion.

How Withdrawal Ordering Affects IRMAA

• Roth withdrawals do not count toward MAGI for IRMAA purposes
• Tax-deferred withdrawals and capital gains do count
• One large conversion or distribution can push you over a threshold for a full year of surcharges
• Consider spreading conversions across multiple years to stay below IRMAA cliffs

Putting It All Together: A Year-by-Year Framework

Here is how a well-planned withdrawal strategy might look for a couple retiring at 62:

The overarching principle: smooth your taxable income across retirement rather than letting it spike. Low-income years are wasted if you do not fill those low brackets with conversions or strategic withdrawals.

Common Mistakes

1. Drawing only from one bucket. Depleting taxable accounts while letting the Traditional IRA balloon is the most common and most costly error.
2. Ignoring the two-year IRMAA lookback. A $200,000 Roth conversion at 63 could cost you thousands in extra Medicare premiums at 65.
3. Converting too aggressively. Filling the 24% bracket with conversions may not make sense if your RMDs would only push you into the 22% bracket.
4. Forgetting state taxes. If you live in a state with income tax, your effective conversion rate is higher. Factor it in.
5. Not coordinating with Social Security. Claiming Social Security early while doing large conversions can trigger the tax torpedo.

Related Guides

• Retirement Tax Planning: Before and During Retirement
• Roth Conversion Ladder
• Required Minimum Distributions (RMDs)
• Taxable Social Security Benefits Calculator
• Roth Conversion (glossary)
• The Social Security Tax Torpedo
• Taxes on Retirement Withdrawals

How sharper.tax Helps

When you upload your tax return to sharper.tax, we analyze your retirement account balances, current tax bracket, and income sources to model withdrawal sequencing and Roth conversion opportunities. We project the tax impact of different ordering strategies so you can see which approach minimizes your lifetime tax bill. sharper.tax exists to make sophisticated tax planning available to everyone for free.

Sources

• IRS Publication 590-B: Distributions from Individual Retirement Arrangements
• Social Security Administration: Income Taxes and Your Social Security Benefit
• IRS Required Minimum Distributions
• Medicare IRMAA

The information above is educational and not tax advice.