You spent 30 years saving into different buckets — a 401(k), maybe a Roth IRA, a brokerage account, some cash. Then you retire, and a question nobody prepared you for shows up: which one do you actually spend first?
It feels like a small bookkeeping decision. It isn't. The order you pull money from your accounts in retirement can change how much you pay in taxes over the rest of your life by tens of thousands of dollars — and in some cases, it determines whether your savings last 28 years or 33. Same portfolio, same spending, different sequence. The math is just quietly working for you or against you.
Here's how withdrawal sequencing actually works, why the "conventional" order isn't always right, and how to figure out your own answer.
The three buckets, and why they're taxed differently
Almost everything you've saved falls into one of three tax treatments.
Tax-deferred accounts — traditional 401(k)s, traditional IRAs, 403(b)s. You got a tax break when the money went in, so every dollar that comes out is taxed as ordinary income, just like a paycheck. The IRS also forces you to start withdrawing from these at age 73 (rising to 75 for some), whether you need the money or not. Those are Required Minimum Distributions, or RMDs.
Taxable accounts — a regular brokerage account, individual stocks, a savings account. You already paid tax on the money you put in. When you sell something that's grown, you only pay tax on the gain, and usually at lower long-term capital gains rates. Some years you might owe almost nothing.
Tax-free accounts — Roth IRAs and Roth 401(k)s. You paid tax going in, and now everything comes out — contributions and growth — completely tax-free. No RMDs on Roth IRAs during your lifetime. This is the most valuable dollar you own, which is exactly why you generally want to spend it last.
The reason sequencing matters is that you have some control over which kind of income you generate each year, and therefore which tax bracket you land in.
The conventional order — and where it breaks
The textbook advice goes: spend taxable first, tax-deferred second, Roth last.
The logic is reasonable. Spending taxable accounts early lets your tax-advantaged accounts keep compounding. Saving the Roth for last gives it the most time to grow tax-free and leaves the most flexible, tax-free money for late-life expenses or heirs.
For a lot of people, this order is fine. But it has a blind spot, and it's a big one: it ignores RMDs.
If you let a large traditional 401(k) sit untouched while you live off taxable and Roth money in your 60s, that 401(k) keeps growing. Then at 73 the government forces you to start pulling from it — and because it's now larger, the required withdrawals are larger too. Those forced withdrawals stack on top of your Social Security, and suddenly you're in a higher tax bracket in your late 70s than you ever were while working. Retirees call this the "tax torpedo," and it's entirely avoidable.
The better frame: fill up the low brackets every year
A more sophisticated approach throws out the rigid order and asks a different question each year: what's the cheapest dollar I can generate right now?
In your early retirement years — after you stop working but before Social Security and RMDs kick in — your taxable income is often unusually low. That's a gift. The first chunk of income each year is taxed at 0%, then 10%, then 12%, before you hit the higher brackets. If you're only filling the bottom of that staircase, you're leaving cheap space on the table.
So instead of just spending taxable assets in those low-income years, many retirees deliberately pull some money out of their traditional 401(k) — even if they don't need it for spending — specifically to fill up the 12% bracket while it's available. This does two things. It gives them spending money taxed at a low rate today, and it shrinks the 401(k) so the forced RMDs later are smaller. You're paying a little tax now at 12% to avoid paying a lot of tax later at 24%.
That maneuver — moving money out of a traditional account during low-income years, often converting it into a Roth — is called a Roth conversion, and the window between retirement and age 73 is the prime time to do it.
Where Social Security and capital gains complicate things
Two wrinkles make this trickier than a simple bracket calculation.
Social Security taxation
How much of your Social Security gets taxed depends on your other income. Generate too much from withdrawals and conversions, and you can push more of your Social Security into the taxable zone — effectively taxing two dollars for every one you withdraw. This is part of why front-loading conversions before you claim Social Security is so often the smart move.
The 0% capital gains bracket
Here's one most people miss entirely: if your taxable income is low enough, long-term capital gains can be taxed at 0%. That means in a low-income year you might sell appreciated stock in your brokerage account, pay nothing on the gain, and immediately rebuy it to reset your cost basis higher. It's called capital gains harvesting, and it only exists in the same low-income window that makes Roth conversions attractive — so the two strategies compete for the same bracket space. You usually can't max out both in the same year, which is exactly why this requires planning rather than a rule of thumb.
A simple example
Imagine two retirees, both 62, both with $1.2 million split across the three buckets, both spending $60,000 a year.
The first follows the textbook order: taxable, then tax-deferred, then Roth. He lives comfortably in his 60s but lets his $700,000 traditional IRA grow untouched. By 73 it's worth over $1 million, and his RMDs plus Social Security push him into the 22% bracket for the rest of his life.
The second does annual Roth conversions from 62 to 72, filling the 12% bracket each year. She pays a bit more tax in her 60s than her neighbor — but by 73 her traditional IRA is small, her RMDs are minimal, and a huge share of her money is now sitting in a tax-free Roth. Over a 30-year retirement, the difference in lifetime taxes between these two paths is frequently $80,000 to $150,000 or more.
Same starting point. Same spending. The only difference was the sequence.
Why this is so hard to do by hand
Reading the strategy is the easy part. Actually executing it means answering, every single year: how much can I convert before I tip into the next bracket? How does that interact with my Social Security? Should I harvest capital gains instead this year? What do my RMDs look like in 11 years if I convert this much now versus nothing?
That's not one calculation. It's a 30-year chain of calculations where each year depends on the last, and every federal bracket, your state's tax rules, FICA, and the Social Security thresholds all move the answer. A spreadsheet can do it, but building one that models all of that correctly takes most people longer than they'd like to admit — and a single wrong formula quietly corrupts every year after it.
See your own sequence
This is exactly the kind of problem Tally was built for. It models your full financial life year by year — every account, real federal progressive brackets, all 50 state tax systems, FICA, capital gains, RMDs, and Social Security — so you can see your projected taxes for the next 30 years and test what happens if you convert more, claim Social Security later, or draw down a different account first. Instead of guessing at the order, you watch the lifetime tax number move in real time.
You can connect your accounts and run your first forecast in about five minutes. Tally is $7.99/month or $79/year, and there's a 14-day free trial — no credit card required. If you've been wondering which account to spend first, this is the fastest way to stop wondering and see the actual answer for your situation.
This article is educational and not tax advice. Withdrawal and Roth conversion strategies depend on your specific situation — consider confirming your plan with a tax professional before acting.