Retirement Withdrawal Mistakes That Could Cost You Thousands in Taxes

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Retirement withdrawal mistakes are rarely obvious in the moment, they show up as a tax bill that’s thousands higher than expected, or a Medicare premium letter that arrives two years after the income that triggered it. Most retirees have spent decades accumulating savings and far less time thinking about how the order, timing, and size of withdrawals will determine how much of that money they actually keep. According to IRS guidance on required minimum distributions, withdrawals from tax-deferred accounts are generally included in ordinary taxable income, which means every dollar you pull out competes directly with your other income for the lowest available tax rate.

The stakes have risen heading into the second half of the 2020s. The Tax Cuts and Jobs Act’s lower ordinary income rates are set to expire after 2025, meaning the federal brackets in 2026 and beyond are structurally less forgiving than the ones retirees planned around for the past eight years. A withdrawal strategy that looked fine in 2023 may cost materially more under current law. That timing shift makes a clear, deliberate withdrawal plan more valuable now than at any point in recent memory.

This guide is written for anyone approaching or already in retirement who holds a mix of traditional IRAs, 401(k)s, Roth accounts, and taxable brokerage accounts. By the end, you will know exactly which errors drain the most money, how to sequence accounts to reduce lifetime taxes, and where the lesser-known rules, like qualified charitable distributions and the Rule of 55, can work in your favor.

Step 1: Why the Order of Your Withdrawals Determines Your Tax Bill

Most people pull from whatever account is most convenient, and that single habit is responsible for more unnecessary tax bills than almost any other retirement withdrawal mistake. Account sequencing, the order in which you draw down taxable, tax-deferred, and Roth accounts, directly controls how much of each dollar you withdraw is taxable in a given year.

The Three Buckets and Why Sequence Matters

The standard framework divides retirement assets into three buckets. Taxable accounts (brokerage accounts) hold investments that generate capital gains taxes when sold, often at preferential long-term rates of 0%, 15%, or 20% depending on income. Tax-deferred accounts (traditional IRAs, 401(k)s, 403(b)s) produce ordinary income on every dollar withdrawn, the same rates that apply to wages. Roth accounts generate no taxable income on qualified distributions. The sequencing decision is essentially a question of which tax rate you want to pay today versus later.

The conventional advice, spend taxable accounts first, then tax-deferred, then Roth, works reasonably well for many retirees, but it ignores one critical dynamic. Leaving a large traditional IRA untouched for years allows it to compound, which can produce massive RMDs starting at age 73. Those RMDs land as ordinary income regardless of whether you need the cash, which can push you from the 12% bracket into the 22% bracket almost overnight. A more tax-efficient approach draws strategically from the tax-deferred bucket early in retirement, filling each bracket deliberately, rather than waiting for RMDs to force the issue.

How Withdrawals Interact with Social Security

The second reason sequencing matters is provisional income. The IRS uses a modified formula, adjusted gross income plus tax-exempt interest plus half of Social Security benefits, to determine how much of your Social Security check is taxable. IRA withdrawals count in full toward that formula. A retiree pulling $30,000 from a traditional IRA while collecting $24,000 in Social Security could hit the 85% inclusion threshold, effectively making three-quarters of their Social Security taxable when it otherwise would not have been. Managing which account you tap, and when, can keep provisional income below these thresholds.

Step 2: The RMD Trap, How Missing or Mismanaging Required Withdrawals Costs You

Missing a required minimum distribution is one of the most expensive retirement withdrawal mistakes you can make, and it happens more often than most people realize. Under current rules, account owners must begin taking RMDs from traditional IRAs and most employer-sponsored plans at age 73 (or age 75 if you were born in 1960 or later, under the SECURE 2.0 Act). The IRS imposes a 25% excise tax on the portion of any RMD not taken, reducible to 10% if the failure is corrected within a two-year window through the Self Correction Program.

According to Vanguard’s 2025 research on missed RMDs, 6.7% of RMD-age traditional IRA clients took no withdrawal at all in 2024, and the average missed distribution was $11,600. At a 25% excise tax rate, that means an average penalty of $2,900 per account, before any income tax on the missed amount itself. Vanguard estimates the total annual cost of missed RMDs across all IRA holders nationwide at $1.7 billion. The Taxpayer Advocate Service stresses that all RMDs after the first must be taken by December 31 each year, not April 1, to avoid this penalty.

Step 3: Lump-Sum vs. Staged Withdrawals, The Bracket Creep Most Retirees Ignore

Taking a large withdrawal in a single year rather than spreading it across several years is a tax mistake that is almost entirely avoidable, yet it is extraordinarily common. A retiree who pulls $80,000 from a traditional IRA to pay off a mortgage or fund a home renovation in a single calendar year may push their taxable income past two or three federal bracket thresholds at once, paying 22% or 24% on dollars that could have been withdrawn in quieter years at 12%.

The Bracket Math in Practice

Here is a concrete example using 2026 federal rates. A single retiree with $30,000 in Social Security income and no other withdrawals sits comfortably in the 12% bracket on their ordinary income. If they add a one-time $60,000 IRA withdrawal to pay off a car loan, a significant portion of that $60,000 crosses into the 22% bracket. Spread across three years at $20,000 each, the same total withdrawal is taxed almost entirely at 12%. The difference in this scenario can easily exceed $3,000 in federal income tax, and that number grows if the lump sum also triggers Social Security taxation or IRMAA surcharges.

The IRMAA Complication

IRMAA (Income-Related Monthly Adjustment Amount) is a Medicare surcharge based on your MAGI from two years prior. Medicare uses 2024 income to set 2026 Part B and D premiums. A single filer whose MAGI exceeded roughly $103,000 in 2024 faces IRMAA surcharges on top of standard Part B premiums in 2026. One large IRA withdrawal can cross that threshold and cost an additional $700 to $4,000 or more per year for two full years, a cost many retirees never see coming because it arrives long after the withdrawal that caused it.

Qualified Dividends and Capital Gains Interactions

Taxable brokerage accounts add another layer. Long-term capital gains and qualified dividends are taxed at preferential rates of 0%, 15%, or 20%, but only up to certain income thresholds. Large IRA withdrawals push ordinary income up, which can inadvertently eliminate the 0% capital gains bracket and subject otherwise tax-free dividends to a 15% rate. This is a retirement withdrawal mistake that a tax professional modeling total income across accounts can easily identify and prevent.

Step 4: Early Withdrawal Penalties and Exceptions That Actually Save Money

Withdrawing from a retirement account before age 59½ costs you a 10% federal penalty on top of ordinary income tax, unless you qualify for one of the exceptions the IRS has carved out. According to IRS guidance on early distribution exceptions, qualifying situations include total and permanent disability, unreimbursed medical expenses exceeding 7.5% of adjusted gross income, certain distributions to qualified domestic relations order beneficiaries, and a series of substantially equal periodic payments (SEPP, also called 72(t) distributions).

The Rule of 55 for 401(k) Plans

One exception that many early retirees miss is the Rule of 55. If you leave your employer in or after the year you turn 55, you can take distributions from that employer’s 401(k) or 403(b) plan without the 10% penalty, no age 59½ required. The rule applies only to the plan from the employer you just left, not to IRAs or older 401(k)s from previous jobs. Rolling that money into an IRA before you understand this distinction removes the exception permanently, which is a costly and irreversible retirement withdrawal mistake.

Qualified Charitable Distributions: The RMD Offset Most People Miss

For account holders aged 70½ and older, qualified charitable distributions (QCDs) allow you to transfer up to $105,000 directly from a traditional IRA to a qualifying charity. The amount counts toward your RMD but never appears in your adjusted gross income. That keeps provisional income lower, protects Social Security taxation thresholds, and avoids pushing MAGI toward IRMAA territory. A retiree with a $15,000 RMD who donates $10,000 via QCD reduces their taxable income by $10,000 compared to taking the RMD and then making a charitable deduction, particularly valuable for those who take the standard deduction.

Step 5: Roth Conversions, How to Time Them Without Creating New Problems

Roth conversions done in the right years can permanently reduce lifetime taxes. Done in the wrong years, they can trigger IRMAA surcharges, spike Social Security taxation, and leave you worse off than if you had done nothing. The mechanics: you move money from a traditional IRA into a Roth IRA, pay ordinary income tax on the converted amount in the year of conversion, and then enjoy tax-free growth and withdrawals going forward, with no future RMDs from Roth IRAs.

The Optimal Conversion Window

The best Roth conversion opportunities typically fall in the years between retirement and age 73, when RMDs begin. During this window, income is often lower than peak earning years but higher than zero, creating space to convert up to the top of the 12% or 22% bracket without crossing into higher territory. If you retire at 65 and delay Social Security to 70, you may have a five-year window with very low taxable income, an ideal environment for aggressive conversions that reduce the future IRA balance and, therefore, the size of future RMDs.

Where Conversions Backfire

The most common Roth conversion mistake is converting too much in a single year. A retiree in the 22% bracket who converts $50,000 may inadvertently push their MAGI above the IRMAA threshold, paying that surcharge for two full years while also increasing Social Security taxation. State income taxes compound the problem: many states tax Roth conversions as ordinary income with no special treatment, so a conversion that looks optimal at the federal level may be costly at the state level. Always model both layers before committing to a large conversion.

The five-year rule adds another constraint. Converted funds must remain in the Roth IRA for at least five years before being withdrawn tax-free if you are under age 59½, a detail that matters if you plan to access converted funds relatively soon after conversion. If you are already over 59½ and your Roth IRA has been open for at least five years, this concern largely disappears.

If you are working toward a stronger overall financial position before or during retirement, our guide on why saving for retirement takes priority over college funding covers the foundational reasoning behind protecting your retirement assets first. Similarly, if tax season planning feels overwhelming, our overview of free IRS tax help options and overlooked credits can point you toward professional resources at no cost.

Step 6: Overlooking Social Security Taxation and Medicare IRMAA in Withdrawal Plans

Social Security taxation is arguably the most misunderstood element of retirement income planning, and the one that turns ordinary retirement withdrawal mistakes into expensive ones. Many retirees assume their Social Security benefit is tax-free. It may be, but only if their combined income stays below specific IRS thresholds. Once combined income (adjusted gross income plus nontaxable interest plus half of Social Security benefits) exceeds $25,000 for a single filer or $32,000 for married filing jointly, up to 50% of benefits become taxable. Above $34,000 single or $44,000 joint, up to 85% of benefits are included in taxable income.

How a Single IRA Withdrawal Changes Everything

A single retiree collecting $24,000 in Social Security with $20,000 in other income sits well below the 85% threshold. Add a $25,000 IRA withdrawal for a home repair, and combined income jumps to $57,000, comfortably above the threshold that subjects 85% of Social Security to ordinary income tax. The effective marginal tax rate on that IRA withdrawal is not just the bracket rate; it includes the hidden cost of making previously untaxed Social Security suddenly taxable. This interaction makes IRA withdrawals meaningfully more expensive than their headline rate suggests for many middle-income retirees.

Coordination Strategies That Reduce Combined Costs

Avoiding these traps requires looking at total income across all sources before making any withdrawal decision in a given year. Three approaches consistently help. First, use QCDs to satisfy part or all of an RMD without adding to adjusted gross income. Second, draw from Roth accounts in years when other income is already near a Social Security or IRMAA threshold, Roth withdrawals are excluded from the provisional income formula. Third, consider whether delaying Social Security while taking IRA withdrawals in low-income years produces a better lifetime outcome than the reverse. Delaying Social Security to age 70 increases the benefit by approximately 8% per year between full retirement age and 70, and that larger benefit arrives during years when IRA balances may be lower due to earlier strategic withdrawals.

Withholding is one more place where retirees stumble. The 1099-R form covers retirement distributions, and many retirees either withhold nothing or withhold a flat amount that doesn’t account for the combined effect of Social Security taxation and IRMAA. The result is an underpayment penalty, even when total annual tax is correct, because the IRS expects timely quarterly payments. Adjusting withholding on Form W-4P or making estimated payments with Form 1040-ES closes this gap. You can also explore whether any remaining high-interest debt, like credit card balances, should be addressed before retirement begins, since carrying that into fixed-income years worsens cash flow; see our breakdown of how to prioritize and negotiate credit card debt for a structured approach.

Frequently Asked Questions

What happens if I miss my RMD deadline?

Missing an RMD triggers a 25% excise tax on the amount you failed to withdraw, according to IRS RMD rules. If you correct the failure within two years using the IRS Self Correction Program, that rate drops to 10%. You still owe income tax on the distribution itself, the excise tax is a separate penalty on top of ordinary income tax. File Form 5329 with your return to report the shortfall and request relief.

How do I calculate my required minimum distribution?

Your RMD equals your prior December 31 account balance divided by a life expectancy factor from the IRS Uniform Lifetime Table (Publication 590-B). For example, a 74-year-old with a $500,000 traditional IRA balance at year-end 2025 would divide $500,000 by the applicable life expectancy factor (roughly 25.5 under the current Uniform Lifetime Table), producing an RMD of approximately $19,608 for 2026. Each year, the factor decreases slightly, meaning your RMD percentage rises even if your balance stays flat.

Can I avoid taxes on my RMD by donating it to charity?

Yes, if you are 70½ or older, a qualified charitable distribution (QCD) allows you to transfer up to $105,000 directly from your IRA to a qualifying charity, and that amount satisfies your RMD without appearing in your adjusted gross income. This is one of the most effective strategies for retirees who donate regularly, because it reduces provisional income and can protect Social Security from additional taxation. The transfer must go directly from the IRA custodian to the charity; a distribution to you first disqualifies the exclusion.

What is the Rule of 55, and does it apply to IRAs?

The Rule of 55 applies only to employer-sponsored plans, 401(k) and 403(b) accounts, not to IRAs. If you separate from your employer in or after the calendar year you turn 55, you can take distributions from that specific plan without the 10% early withdrawal penalty. Rolling those funds into an IRA before you begin withdrawals permanently removes this exception, so hold off on any rollover until you have taken the distributions you need under this rule.

Should I do a Roth conversion if I am already taking Social Security?

A Roth conversion while receiving Social Security is often still worthwhile, but the math requires careful modeling. The converted amount adds to your adjusted gross income, which increases your provisional income and can push more of your Social Security into taxable territory, effectively raising your marginal rate above the stated bracket. Smaller, targeted conversions that keep you just below the 85% Social Security threshold are generally safer than large conversions that cross it by a wide margin.

How do I know if my IRA withdrawal will trigger an IRMAA surcharge?

Medicare IRMAA surcharges are based on your MAGI from two years prior to the premium year. For 2026 premiums, Medicare uses your 2024 tax return. Single filers with 2024 MAGI above approximately $103,000 and joint filers above $206,000 face IRMAA surcharges on Part B and Part D premiums. If a one-time event (like a large IRA withdrawal or Roth conversion) pushed your income over the threshold, you can appeal using Form SSA-44 if you experience a qualifying life change that reduces current-year income.

Is it better to take money from my brokerage account or my IRA first in retirement?

For most retirees, drawing from taxable brokerage accounts first makes sense early in retirement, long-term capital gains rates (0% to 20%) are typically lower than ordinary income rates that apply to IRA withdrawals. However, this general rule has exceptions. If your taxable account is large and generating significant dividend income, or if your traditional IRA balance is on track to produce very large RMDs, pulling from the IRA early to keep future RMDs manageable may produce a better lifetime tax outcome. The right answer depends on your specific account balances, income sources, and projected RMD trajectory. Building a solid investment foundation before retirement helps, see how to start investing with zero experience for the fundamentals if you are earlier in the process.