The Order Matters: Decumulation Sequencing

The irony nobody names

People spend thirty years learning exactly how to put money into retirement accounts — employer matches, contribution limits, the mechanics of compound interest. Almost nobody is ever taught the strategy for taking it back out. Picture retiring at 65 with a traditional IRA, a Roth IRA, and a taxable brokerage account, needing $60,000 a year to supplement Social Security. Which account gets drawn from first? Most people answer with a shrug — a gut-feeling guess rather than an actual written, sequenced withdrawal plan.

Two different jobs

The disconnect comes from confusing two entirely different financial jobs: the accumulation expert, who manages the portfolio and focuses purely on growing the pile, and the income engineer, who manages the tax bracket — what's actually kept after the government's share, not just the gross number on a statement. An unmanaged withdrawal sequence sitting underneath a genuinely excellent accumulation strategy can quietly bleed six figures over a retirement.

Why "taxable first" can backfire

The conventional default — spend taxable brokerage money first, then traditional IRA, save Roth for last — sounds airtight: delay taxes as long as possible. Applied mechanically, without modeling the years ahead, it can actually increase a lifetime tax bill, because it ignores the pre-RMD window: the years between retirement and age 73, when required minimum distributions begin. Living entirely off a taxable account during those years often means near-zero taxable income — a historically low bracket — while the traditional IRA keeps compounding untouched. At 73, the forced RMD is calculated against that much larger balance, stacking on top of Social Security and pushing the tax bracket sharply higher than it would have been during the window that was left unused.

The reframe: it was never a choice between paying tax or not. Only a choice of when, and at what rate. Leaving the pre-RMD years unused doesn't avoid a tax bill — it forfeits the chance to pay it at a discount.

Richard and Carol — the $230,000 gap

Richard and Carol have identical retirement assets, an identical annual income need, and identical market returns over a twenty-year retirement. The only variable: withdrawal strategy. In the default scenario, they follow the taxable-first rule — federal taxes near zero for the first eight years, while their IRA keeps growing untouched. At 73, forced RMDs stack on Social Security, pushing their bracket sharply higher, with up to 85% of their Social Security becoming taxable.

In the managed scenario, an income engineer evaluates their bracket every year — intentionally pulling extra dollars from the traditional IRA in years there's unused low-bracket room, and executing Roth conversions in years there's room but no immediate cash need, paying today's lower rate voluntarily rather than a forced higher rate later. The result, over twenty years: approximately $230,000 less in federal income tax than the default sequence — same assets, same income, same market. The entire gap is attributable to the order money was drawn in, and the discipline of managing that order year over year.

Tax-bracket Tetris

A useful way to picture it: your tax bracket as a Tetris board with a finite amount of empty space before the next, higher bracket begins. Income sources — IRA withdrawals, Roth money, Social Security, capital gains — are the falling pieces. Let them fall randomly and they stack up awkwardly, spilling into a higher bracket sooner than necessary. Rotate them intentionally — a Roth conversion here, capital gains harvested at the 0% rate there — and the board stays clean, maximizing the room inside the current bracket before the rate jumps.

Four steps, and the objections

Building an actual sequence means, every year: (1) projecting this year's likely taxable income from all sources; (2) identifying exactly how much room remains in the current bracket; (3) deciding which account most efficiently fills that room — including whether a Roth conversion makes sense; and (4) revisiting the whole decision annually, since tax law, balances, and income all shift year to year.

A CPA already handles this, some argue — but a CPA is a financial historian, reconciling what already happened to ensure compliance. An income engineer works forward: what to do this year so less is owed a decade from now. Roth conversion timing feels risky, others worry — legitimately, since converting even a dollar too much can trigger Social Security taxation or a Medicare IRMAA surcharge two years later — which is exactly why the projection needs to be run deliberately, not skipped for being complicated. And old 401(k)s sitting with former employers are a common blind spot — unmanaged, disconnected from the current tax picture, quietly becoming future RMD time bombs.

One final consideration: unmanaged pre-tax accounts don't just cost the original owner. Under current law, non-spouse heirs must fully drain an inherited IRA within ten years — often landing in their own peak earning years, stacking a fully taxable inherited distribution on top of an already-high salary.

This companion episode discusses the same underlying material as Episode 9 of The Income Standard, where Tod Long covers it directly in his own voice.