A married couple, both 67, holds $1.2 million in a traditional 401(k), a $300,000 Roth IRA, and a $200,000 taxable brokerage account. They collect $48,000 a year in Social Security. With three accounts drawing from different tax buckets, they have the architecture to pay zero federal income taxes in retirement. Most people in this situation pay thousands in federal taxes because they pull from the wrong account in the wrong order.
The Three-bucket System and Why Sequencing Is Everything
The strategy rests on a simple hierarchy: spend the taxable brokerage account first for capital gains income, then draw from the Roth IRA tax-free, and pull from the traditional 401(k) last, keeping those withdrawals small enough to stay under the standard deduction. Each bucket has a different tax treatment, and the order you tap them determines whether you owe the IRS anything at all.
Start with the taxable brokerage account. Long-term capital gains in 2026 are taxed at 0% for married couples filing jointly with taxable income up to $98,900. If the brokerage account holds dividend-paying ETFs, those qualified dividends fall under the 0% rate within that threshold. A couple drawing $40,000 from a brokerage account holding something like Schwab U.S. Dividend Equity ETF (NYSE:SCHD | SCHD Price Prediction) pays nothing in federal tax on those gains or dividends as long as total taxable income stays under $98,900.
The Roth IRA handles the rest of the spending need. Qualified Roth distributions are completely tax-free and do not count as income for any federal purpose. They do not push you toward the Social Security taxation thresholds. They do not count toward IRMAA calculations. For a couple spending $80,000 a year, drawing $40,000 from the brokerage account and $40,000 from the Roth covers the full budget with no federal tax consequence.
The 401(k) Withdrawal Cannot Exceed the Standard Deduction
The traditional 401(k) is the account that breaks the strategy if you are not careful. Every dollar withdrawn counts as ordinary income and flows directly into the calculation for Social Security taxation and Medicare IRMAA surcharges. The goal is to withdraw only what the standard deduction absorbs.
For a married couple both over 65 in 2026, the numbers stack up generously. The base standard deduction for married filing jointly is $32,200. Each spouse over 65 adds $1,650, bringing the total to $35,500 for one qualifying spouse or $38,800 for two. On top of that, the One Big Beautiful Bill Act added a new $6,000 above-the-line senior deduction for taxpayers 65 and older, available for tax years 2025 through 2028, though it phases out for joint filers with AGI above $150,000. For a couple with low income, that stacks to a meaningful combined shield before a single dollar of federal income tax applies.
A couple pulling $44,000 from their 401(k) — staying just under that combined deduction ceiling — owes nothing in federal income tax on the withdrawal. Total retirement income: $48,000 Social Security plus $44,000 from the 401(k) plus $40,000 from brokerage gains plus $40,000 from the Roth — all with a federal tax bill of zero.
The Social Security Trap Inside the 401(k) Withdrawal
The one number that can collapse this plan is the Social Security combined income threshold. For married couples filing jointly, up to 85% of Social Security benefits become taxable once combined income (AGI plus nontaxable interest plus half of Social Security) exceeds $44,000. A $44,000 401(k) withdrawal plus half of $48,000 in Social Security pushes combined income well above that threshold — well above that threshold. The standard deduction offsets the taxable income, but the combined income calculation still happens first, and it can push a meaningful share of Social Security into the taxable column.
The fix: keep 401(k) withdrawals small enough that combined income stays manageable, and let the Roth and brokerage accounts carry more of the load. Roth distributions and the return-of-basis portion of brokerage withdrawals do not count toward combined income. This is why the three-bucket approach works where a single-account strategy fails.
The IRMAA Cliff You Cannot Afford to Cross
Medicare premiums add another reason to control 401(k) withdrawals precisely. The 2026 standard Part B premium is about $203 per month. The 2026 standard Part B premium is $202.90 per month. IRMAA surcharges begin when MAGI exceeds $218,000 for married couples filing jointly, adding about $81 per person per month at the first tier. irma surcharges begin when magi exceeds $218,000 for married couples filing jointly, adding about $81 per person per month at the first tier. That is an extra $1,948 per year per person, or nearly $4,000 per couple, for crossing the threshold by a single dollar. IRMAA uses a two-year lookback, so 2026 income affects 2028 premiums. irma uses a two-year lookback, so 2026 income affects 2028 premiums. A large 401(k) withdrawal today shows up as a premium surcharge two years from now.
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