A married couple spending $145,000 a year in retirement can legally owe zero in federal income taxes. Their tax bill isn’t low – it’s zero. The key isn’t a loophole, an accountant’s trick, or an unusual income level. It comes down entirely to the order in which they pull money from three different types of accounts.
Most retirees treat their 401(k) as a single pool of savings and draw from it whenever they need cash. That approach is technically simple and practically expensive. Every traditional 401(k) dollar lands as ordinary income, filling the 2026 married-filing-jointly brackets that jump from 12% at $24,800 to 22% at $100,800 and higher from there. But the real cost isn’t the bracket rate – it’s what happens when that income crosses certain invisible lines in the tax code, lines that most retirees don’t know exist until they’ve already crossed them.
Financial planners call it the three-bucket 401k withdrawal strategy. It organizes retirement savings not by size or investment type, but by how each account is taxed – and then sequences withdrawals to keep as much money as possible out of the IRS’s reach. Each bucket plays a distinct role, and the order you tap them in matters far more than most people realize.
1. Bucket One: Your Traditional 401(k) and IRA (Tax-Deferred)
Traditional 401(k) withdrawals are taxed as ordinary income at the taxpayer’s marginal tax rate. In plain terms: every dollar you pull from a traditional 401(k) or traditional IRA gets added to your income for the year, just like a paycheck. Bracket rates top out at 37% above $768,700 for married couples filing jointly in 2026, with the 22% band starting at $100,800 of taxable income, according to the IRS.
Traditional 401(k) withdrawals can push up to 85% of Social Security benefits into taxable income and, via a two-year lookback, can trigger IRMAA, the Medicare premium surcharge that runs roughly $70 to $400 per month per spouse. A retiree in the 22% bracket who trips both Social Security taxation and the first IRMAA tier faces an effective marginal rate of nearly 40% on the next dollar withdrawn. Pulling exclusively from this bucket is what creates that outcome.
Tax-deferred accounts such as 401(k)s grow tax-free until withdrawal in retirement, with required minimum distributions (RMDs) starting at age 73. That mandatory withdrawal clock is the other reason this bucket can’t be ignored. RMDs eventually force you to drain this bucket, starting at age 73. The practical move in the years between retirement and age 73 is to draw down this bucket strategically – enough to fill the lower tax brackets, but not so much that you trip the Social Security or IRMAA thresholds. The 2026 standard deduction for joint filers is $32,200, and a clean three-bucket plan pulls roughly $55,000 from the 401(k) – enough to cover the standard deduction and most of the 12% bracket – before switching to the other accounts.
2. Bucket Two: Your Taxable Brokerage Account
The taxable brokerage account is the most misunderstood of the three. Many retirees assume it’s the worst bucket because it doesn’t carry the “tax-advantaged” label. The opposite is often true. For 2026, long-term capital gains are taxed at preferential rates of 0%, 15%, or 20%, entirely separate from ordinary income brackets, according to Kiplinger’s 2026 capital gains update.
Qualified dividends and long-term capital gains in the taxable bucket are taxed at these preferential rates, and critically, only the gain portion is taxed – not the return of basis. If you bought a stock for $50 and it’s now worth $80, only the $30 gain is taxable. The original $50 comes back to you tax-free. For retirees with significant cost basis in their brokerage accounts, this means large portions of their withdrawals carry no federal tax at all.
The 0% long-term capital gains bracket is available for joint filers with modest taxable income. Specifically, the 0% bracket applies up to $98,900 in taxable income for married couples filing jointly in 2026. That’s not $98,900 in salary – it’s taxable income after deductions. A couple drawing $55,000 from their 401(k) and then claiming the $32,200 standard deduction has roughly $22,800 in taxable ordinary income, leaving substantial headroom to realize long-term gains at the 0% rate before crossing into the 15% tier. The 15% long-term capital gains bracket ceiling for married couples filing jointly in 2026 is $613,700, so most retirees will never pay more than 15% on gains realized from a brokerage account.
The practical move: use this bucket to harvest gains deliberately each year, up to the 0% ceiling, rather than letting them sit and accumulate. Retirees who do this consistently reduce the eventual tax burden from the account over time.
3. Bucket Three: Your Roth IRA (The Release Valve)
Roth IRA withdrawals are entirely tax-free once the account holder is age 59½ and has owned the account for at least five years. No income tax. No Medicare premium surcharge. No effect on Social Security taxation. For retirees managing a complex income picture, those properties are extraordinary.
Roth withdrawals don’t count as taxable income and do not count toward provisional income for Social Security or MAGI for IRMAA calculations, according to Empower’s 2026 Roth IRA withdrawal guide. In practical terms, this means a retiree can pull $20,000 from a Roth account and their Medicare premiums, Social Security tax, and income tax bracket are completely unaffected. No other account type can do that.
This makes the Roth the release valve for years when income gets close to a dangerous threshold. If a 401(k) distribution would push MAGI above the first IRMAA tier – which for married couples filing jointly in 2026 sits at $218,000, triggering a Medicare surcharge of hundreds of dollars per month per spouse – the answer is to stop pulling from the 401(k) and fill the gap with Roth money instead. The spending need is met. The threshold is not crossed.
Roth contributions can be withdrawn at any time, tax-free and penalty-free, regardless of age or account age – it’s only earnings that require the account to be at least five years old and the holder to be at least 59½ for tax-free treatment. This gives retirees additional flexibility even if their Roth is relatively new.
Retirees most often damage the Roth by saving it for last by default, protecting the tax-free bucket as a reflex rather than deploying it where it does the most work. The Roth should be used in any year where pulling more from the other two buckets would cross a taxable threshold.
What the Sequence Actually Looks Like in Practice
Consider a couple who retired at 64 and 65 with a traditional 401(k), a Roth IRA, and a taxable brokerage account. Social Security is deferred until 70 – and that deferral is the entire reason the math works. No Social Security means no provisional-income calculation, no 85% inclusion trap, and full use of the standard deduction against ordinary income.
A clean three-bucket plan pulls roughly $55,000 from the 401(k) to fill the standard deduction and most of the 12% bracket, then $40,000 from the taxable account where much of it is basis and the gain sits at 0% or 15%, then $15,000 from the Roth for anything that would otherwise push income over a threshold. Total spending: $110,000. Federal income tax: minimal to zero, depending on the specific basis in the brokerage account.
Medicare uses a two-year lookback on income, so a 2026 Roth conversion shows up on 2028 premiums. If a planned conversion would push MAGI above roughly $212,000 for joint filers, the right move is to split it across two tax years. This two-year lag is also why projecting income five years out matters – the decisions made today don’t just affect this year’s tax return. They affect Medicare costs two years from now.
The SECURE 2.0 Act created additional planning flexibility here by pushing RMD ages later for many people, widening the window for Roth conversions and bracket management before mandatory distributions begin. If you haven’t reviewed how these rule changes affect your own timeline, the 401(k) rule changes that took effect in 2025 and 2026 are worth understanding before making withdrawal decisions.
The Fed funds target sits at 3.75%, down from 4.5% a year ago – meaning cash in a tax-deferred bucket earns less than it did in 2025 – while core PCE rose 0.3% month-over-month in May 2026 and the Social Security COLA came in at 2.8%. Purchasing power erodes while tax brackets and IRMAA thresholds inch up only with inflation. Every year the sequence isn’t optimized is a year the difference compounds against you.
Read More: The 401(k) Rules That Changed in 2025 That Most People Still Don’t Know About
What to Do Now
Pull last year’s Form 1040 and your Social Security SSA-1099. Add your projected 401(k) withdrawals to half your Social Security benefit. If that total exceeds $44,000 for a joint filer, 85% of your benefit is already taxable – and every additional dollar from the 401(k) makes it worse. That calculation alone tells you whether your current withdrawal pattern is already costing you more than it needs to.
Retirees who hold the bulk of their savings in a traditional 401(k) with no Roth and no taxable brokerage have limited flexibility – all three buckets only deliver their full value when all three exist. If that describes your situation at 55 or 60, Roth conversions in the years before full Social Security enrollment – while income is lower and tax brackets are partially empty – are the most cost-effective way to build the third bucket while there’s still runway to do it. Model the 70-year-old version of your tax return now. Project Social Security plus eventual RMDs against the $218,000 MFJ IRMAA threshold. If that future return crosses the line, the deferral years between 65 and 70 are the last cheap conversion runway – and every year skipped is permanent.
Disclaimer: This information is not intended to be a substitute for professional financial advice, investment advice, tax advice, or legal advice, and is provided for informational purposes only. Always seek the guidance of a qualified financial advisor, accountant, or other licensed professional regarding your personal financial situation or investment decisions. Do not make financial, investment, or tax decisions based solely on information presented here. Past performance is not indicative of future results, and all investments carry risk, including the potential loss of principal.
AI Disclaimer: This article was created with the assistance of AI tools and reviewed by a human editor.