Tax-Efficient Withdrawal Strategy

Retirement savings usually sit in accounts with three tax treatments: a taxable brokerage account, where a sale is taxed only on its gain, though dividends and interest are taxed yearly; tax-deferred accounts such as a traditional IRA or 401(k), taxed as ordinary income when withdrawn, apart from any after-tax contributions; and Roth accounts, tax-free once the rules are met. Tax diversification gives you the mix; a withdrawal strategy decides how to spend it.

The goal is the lowest total tax across your retirement, and often your heirs’ lifetimes, not the lowest bill this year. Living only on a brokerage account can mean a near-zero tax bill today while a large IRA keeps growing, until required minimum distributions start at 73 or 75 and stack on top of Social Security in higher brackets.

A good strategy therefore looks ahead. It estimates each year’s taxable income, decides how much room to use in the low tax brackets, and picks the account that fills that room most cheaply, sometimes adding a Roth conversion in years when income is unusually low. It decides only which account pays: how much to spend comes from a spending rule such as dynamic spending, and where near-term cash waits may follow a bucket strategy.

The conventional order spends taxable accounts first, then tax-deferred accounts, then Roth accounts. It lets the tax-advantaged accounts keep compounding, and early withdrawals are cheap because only the gain is taxed. In one 2026 Vanguard illustration, this order cut a hypothetical retiree’s cumulative taxes by age 100 by about 14% compared with drawing from every account in proportion.

Its weakness shows up when the taxable account runs dry. Withdrawals then come entirely from pre-tax money just as RMDs and Social Security arrive, which can push income into the 22% or 24% bracket, set off the Social Security tax torpedo or cross an IRMAA threshold for Medicare premiums.

A bracket-filling approach keeps the order but blends it. Each year you take enough from tax-deferred accounts, or convert enough to Roth, to fill the 10% or 12% bracket, and cover the rest from taxable or Roth money. Some households go further and draw tax-deferred money first, keeping taxable assets that can receive a step-up in basis at death. No order is best for everyone; the answer depends on your balances, expected future tax rates, state, and whether leaving money to heirs matters.

A few federal thresholds decide how much low-tax room each year holds. Most rise with inflation each year, but some are fixed in the tax code and catch more retirees over time, including the Social Security and net investment income tax thresholds. State income tax adds another layer, from no tax at all in some states to exclusions for pension or IRA income in others, so check your own state before copying a federal plan.

The gap years between retiring and starting Social Security or RMDs are often the lowest-income years of your life. They are the natural time for IRA withdrawals or Roth conversions up to the 12% or 22% bracket, and for tax-gain harvesting in the 0% bracket. Before 65, watch marketplace health-insurance credits: for 2026 coverage they end above 400% of the federal poverty line.

From 63 on, income also sets Medicare premiums two years later, so IRMAA tiers become a second set of brackets. Once Social Security starts, each extra IRA dollar can make more of your benefit taxable. When RMDs begin, the question becomes whether any low-bracket room is left, and whether qualified charitable distributions from 70½ can satisfy the RMD without adding to income. Late in life, your heirs’ brackets matter: Roth money and taxable assets that get a step-up in basis usually pass more cheaply than a traditional IRA. Spending one account first also changes your combined stock share, so check your glide path across all accounts.

The costliest errors come from optimizing one year at a time, or one tax at a time. Medicare premiums, marketplace credits and the taxation of Social Security all sit outside the income tax brackets, and a move that saves income tax can raise a premium or shrink a credit by more than it saves. Test any plan across the whole retirement, and against the survivor’s return as well as the couple’s.