Tax Alpha Through Withdrawal Sequencing

Can the order you spend your accounts really matter more than what they earn? For many retirees, yes. Drawing the same total income in a smarter sequence can extend how long a portfolio lasts by years, and it doesn’t require a single point of extra return. The industry calls this tax alpha: the added value that comes purely from tax-smart decisions rather than investment performance. Withdrawal sequencing is the biggest source of it, and it’s the move most retirees never make because the conventional wisdom is wrong.

The conventional order, and why it’s incomplete

The old rule of thumb says: spend taxable accounts first, then tax-deferred, then Roth last. The logic is to let the tax-sheltered accounts compound as long as possible. It’s not crazy, and it beats spending randomly. But it’s incomplete, because it ignores the bracket. Drain the taxable account completely first and you spend years in artificially low brackets, leaving cheap bracket space empty, and then RMDs hit and force a wall of income through high brackets all at once. The naive order smooths nothing. It creates a valley of wasted low brackets followed by a mountain of forced high-bracket income.

The reason this matters so much is the RMD cliff. If you let a large IRA sit untouched while you spend taxable money, the IRA keeps compounding, and at 75 it throws off a forced withdrawal that can spike you into the 32% bracket and lift your IRMAA surcharge. The strict “tax-deferred last” order practically guarantees that spike.

What sequencing actually optimizes

The smarter approach abandons the rigid order and instead targets a bracket each year. You fill a chosen bracket, say 22% or 24%, with the most tax-efficient combination of sources, blending taxable withdrawals, IRA withdrawals or conversions, and Roth distributions to land your income exactly where you want it. The goal isn’t to empty one account before touching the next. It’s to keep your top dollar in the same reasonable bracket every year for thirty years, never wasting a low bracket and never getting spiked into a high one.

In practice that means tapping the IRA earlier than the old rule says, on purpose, to use up the low brackets before RMDs do it for you, while still letting the Roth grow. You’re not spending tax-deferred last. You’re spending it deliberately throughout, in the amount that fills the bracket. The Roth becomes the flexible reserve you draw on to top up spending in a year when adding more IRA income would cross a line, whether a tax bracket or an IRMAA tier.

A worked contrast

Two couples each need $120,000 a year and each hold $1M taxable, $2M IRA, $500,000 Roth. The first follows the naive order: taxable first, untouched IRA. For years their income is just the taxable account’s small dividends, wasting the 12% and 22% brackets, while the IRA compounds to $3M. At 75 the RMD alone is over $120,000, stacking on Social Security into the 32% bracket. The second couple fills the 22% bracket every year from the start, blending IRA withdrawals with taxable money and a little Roth. Their income is steady, the IRA grows more slowly, and the eventual RMD is far smaller because they shrank the balance during the cheap years. Same spending, same returns, very different lifetime tax.

If your accounts are large

For households with $3M or more, sequencing is where the largest tax alpha is found, and it’s inseparable from Roth conversions. The conversions are just sequencing in advance: pulling IRA income into the low brackets before RMDs arrive. It also leans on asset location, since holding slower-growing assets in the IRA keeps the future RMD smaller and makes the sequence easier to manage. And it has to respect the breakpoints that bind, because for the affluent the IRMAA tier often constrains the annual fill before the tax bracket does. The right sequence is the one that keeps every year’s top dollar under the line you’ve chosen, for as many years as the plan runs.

The order you spend isn’t a footnote. It can be worth more than any fund you pick, and the conventional “tax-deferred last” rule quietly sets up the exact RMD spike it’s trying to avoid. Fill a bracket, not an account, every year, and the money lasts longer for no extra risk. For the order in the broader income context, see tax-efficient withdrawal order.