You spent forty years deciding how much to save. You get one chance to decide how to spend it, and the order matters more than almost anyone is told.
Here is the shape of the problem. A retiree with a taxable brokerage account, a traditional 401(k), a Roth IRA and an HSA has four taps. They all produce money. They do not all cost the same:
| Draw the next $1,000 from | Tax, at a 22% federal and 3.5% state rate |
|---|---|
| Roth | $0 |
| Taxable — your own basis back | $0 |
| Taxable — long-term gain at 0% | $0 |
| Taxable — long-term gain at 15% | $150 |
| Traditional / pre-tax | $255 |
| HSA, non-medical, under 65 | $455 |
Same thousand dollars in your hand. A spread of $0 to $455 depending on which tap you opened.
And the part that is not on that table
Three thresholds in the tax code behave as cliffs rather than slopes, and a withdrawal can walk you over one without any warning at all:
IRMAA — the Medicare premium surcharge. Assessed on your income from two years ago, so a conversion in 2026 raises a premium you will not see until 2028. One dollar over a bracket raises it for the entire year, for each person on Medicare.
Social Security taxability. Up to 85% of your benefit becomes taxable above a provisional-income threshold. A traditional withdrawal raises provisional income. A Roth withdrawal does not.
The capital-gains 0% band. For a retiree with modest ordinary income, long-term gains are frequently taxed at nothing — until an ordinary withdrawal pushes taxable income over the ceiling, at which point the gains you were going to realise for free start costing.
None of these is a tax bracket, and none of them is gradual.
By the end of this guide you will have the cost of the next dollar from every account you own, the three cliffs mapped against your own numbers, a use for the conversion window between retiring and your first RMD, the RMD arithmetic with the penalty for missing one, what your state does to all of it, and the five situations where the conventional order is wrong.
A note on the figures. RMD divisors are the IRS Uniform Lifetime Table from Publication 590-B, Appendix B, Table III; distributions and penalties are computed by this site's own RMD engine. State retirement tax figures are computed by this site's fifty-state income-tax dataset, which records each state's own exclusions with a citation per state. IRMAA brackets, the capital-gains ceiling, contribution limits and the provisional-income thresholds change annually, and this guide deliberately does not print them — a stale threshold would look authoritative and be wrong. It tells you where to find each one instead. This is general education, not personalised tax, legal or investment advice, and retirement withdrawal sequencing is an area where a professional earns their fee. This site takes no lead-generation and no affiliate money.
Why the order is the last lever you have
Everything else about a retirement plan was decided years ago.
How much you saved is fixed. So is what you earned, what you invested in, and when you stopped. None of it can be revisited.
What is still open is the sequence — which account each dollar comes out of, in which year. It is the one variable left, it is entirely under your control, and it is worth a surprising amount:
On $95,000 of retirement income, the state you live in swings the tax bill from $0 to $5,114. That one is mostly decided by where you already are.
But the account you draw from swings the cost of the same $1,000 from nothing to $255 on ordinary rates — and considerably more than that if the withdrawal happens to cross a cliff.
Over a thirty-year retirement, drawn every year, that is not a rounding difference.
Why almost nobody optimises it
Three reasons, and none of them is stupidity.
The rules are genuinely scattered. RMD ages sit in one place, IRMAA brackets in another, capital-gains ceilings in a third, and state exclusions in fifty more. Nothing assembles them.
The feedback is delayed or invisible. A withdrawal that crossed an IRMAA bracket shows up two years later as a higher Medicare premium, with nothing to connect it to the decision that caused it.
And the advice industry is organised around accumulation. There is a great deal of guidance on how much to save and remarkably little on the order to spend it in, because the first is where the products are.
What this guide will not do
It will not tell you how much you can safely withdraw. That is a different question — section 11 covers it briefly and honestly, which mostly means explaining why the confident answers you have read are less confident than they sound.
It will not tell you when to claim Social Security, which deserves its own treatment.
And it will not replace a professional. Withdrawal sequencing has consequences that cannot be unwound, the interactions are genuinely complex, and this is one of the areas where advice is worth paying for. What this guide does is make you a client who arrives with the right numbers already worked out.