Withdrawal Sequencing, or Which Account First

Two retirees with identical portfolios and identical spending can pay very different amounts of tax over thirty years. The difference is withdrawal sequencing — which account each dollar comes out of, and in which year.

This is one of the few remaining levers after you stop working. You cannot change your salary, your contribution history, or past returns. You can change the order, and the order is worth a great deal.

Three pockets, three tax treatments

Everything depends on the fact that retirement money sits in buckets that are taxed differently.

Taxable accounts. Brokerage and savings. You already paid tax on the principal. Selling triggers tax only on the gain, and long-term gains are taxed at their own lower rates. Interest and dividends are taxed as they arrive whether you spend them or not.

Tax-deferred accounts. Traditional 401(k)s and IRAs. Nothing has been taxed yet. Every dollar withdrawn is ordinary income at your full marginal rate.

Tax-free accounts. Roth IRAs and Roth 401(k)s. Tax was paid going in. Qualified withdrawals produce no taxable income at all — and critically, they do not appear in any of the income tests that other thresholds key off.

That third property is what makes Roth balances valuable beyond their tax rate. They are the only way to spend money without moving your income figure.

The conventional withdrawal sequencing order

The standard advice is taxable first, then tax-deferred, then tax-free.

The logic is straightforward. Taxable accounts are the least tax-efficient to hold, because their dividends and interest are taxed every year whether or not you touch them. Spending them first stops that leakage. Meanwhile the sheltered accounts keep compounding untaxed for longer, and the tax-free account — the most valuable per dollar — is preserved longest.

There is a second benefit that gets less attention. Selling from a taxable account often generates surprisingly little taxable income, because only the gain is taxed and part of every sale is return of your own principal. A retiree living off a taxable account can have very low taxable income indeed, which sets up the exception below.

The retirement drawdown calculator models the balances year by year, and the withdrawal sequencing calculator compares orders directly.

Why the conventional order is often wrong

Followed rigidly, the standard sequence produces a predictable failure: it wastes the cheapest tax years of your life and then walks into the most expensive ones.

Here is the shape of it. You retire and live off taxable savings, so your taxable income is near zero — and the low brackets go unused. Meanwhile the traditional balance compounds untouched. Years later, Social Security starts, required distributions begin, and suddenly you have large mandatory income you cannot switch off, taxed at high rates, possibly triggering Medicare surcharges as well.

You deferred into a worse rate. That is the opposite of the intended trade.

The fix is bracket filling. In those low-income years, deliberately create income up to the top of a low bracket — by withdrawing from the traditional account, or by converting to Roth if you do not need the cash. Either way you shrink the balance that future required distributions will be calculated from, at a rate you may never see again.

The refined rule is not an order at all. It is: spend from whichever account keeps this year's taxable income in the band you want, given everything else happening this year.

The thresholds that make certain dollars expensive

The reason a single extra dollar of income sometimes costs far more than its rate is that several rules key off income totals.

Medicare premium surcharges are tiered with hard cliffs, assessed on a two-year lookback. One dollar over a boundary raises premiums for a full year — check the IRMAA calculator before topping up a bracket.

The taxable share of Social Security rises with other income under a combined income formula, so a traditional withdrawal can drag benefit dollars into tax alongside itself, producing a marginal rate noticeably higher than the bracket suggests.

Long-term capital gains bands sit on top of ordinary income. Ordinary withdrawals can push gains from one band into a higher one.

Marketplace subsidies, for anyone retired before Medicare eligibility, are income-tested and can be worth more than the tax at stake.

Roth withdrawals are the only ones that avoid every item on that list. That is the argument for keeping some tax-free balance available rather than spending it last on principle — it is the tool for the expensive years, and spending it last means never having it when you need it.

Practical rules that survive contact with a real year

Take the free money first. Cash, maturing bonds, dividends you were paid anyway. Reinvesting dividends and then selling something else to raise cash is a pointless extra transaction.

Harvest gains in the empty years. If your income is low enough that long-term gains fall in the zero-rate band, realise gains and immediately repurchase. You reset your cost basis upward at no tax cost — the wash sale rule applies to losses, not gains. The cost basis calculator tracks what that does to future sales.

Use losses deliberately. Realised losses offset gains and a limited amount of ordinary income, and carry forward indefinitely.

Give from the IRA once eligible. A qualified charitable distribution satisfies the required distribution and never enters your income, which beats donating cash and deducting it for anyone taking the standard deduction.

Leave the right accounts to the right heirs. Heirs inherit taxable assets with a stepped-up basis, which can wipe out a lifetime of unrealised gain. They inherit traditional balances with the tax still attached and a compressed withdrawal window. If some of your estate goes to charity, the traditional balance is the part to give.

Do the arithmetic in the autumn. By October you know most of your year's income and can size the last withdrawal or conversion against a real number rather than a forecast. The effective tax rate calculator is a quick way to see what the year already looks like before you add to it.

The overall point is that withdrawal sequencing is an annual decision, not a policy set once at retirement. The right answer changes when a pension starts, when Social Security begins, when a large expense lands, and when the market moves — and each of those is an opportunity to pay less on exactly the same spending.