How much you can safely spend each year, and why the order of your investment returns matters as much as the average.
If you’ve saved diligently for decades, retirement flips the question you’ve been asking. Instead of “how much can I save,” it becomes “how much can I safely spend?” Pull out too little and you’re needlessly skipping the trips and comforts you saved for. Pull out too much, too fast, and you risk running out of money in your 80s or 90s. That’s exactly when you can least afford it. This page walks through the three ideas that matter most for getting that number right. They are a well-known starting rule of thumb, the hidden risk that can throw it off, and a practical way to manage that risk.
The 4% rule, in plain English
Where the number comes from
In 1994, a financial planner named William Bengen studied nearly 70 years of U.S. stock and bond market history. He wanted to know the highest starting percentage a retiree could withdraw and still survive every 30-year retirement in that history. That’s assuming they withdrew every year and adjusted the amount for inflation. That includes the worst case on record — someone who retired right before the high-inflation, poor-market stretch of the early 1970s. His answer, for a portfolio split 60% stocks and 40% bonds, was just above 4%.
A follow-up study backed up the same range using a slightly different method. Three professors at Trinity University published it in 1998, and it’s often called the “Trinity Study.” That’s where “the 4% rule” comes from.
How it works, year to year
Here’s the part that trips people up. The 4% only applies once — in your very first year of retirement. After that, you stop recalculating 4% of your balance each year. Instead, you take last year’s dollar amount and bump it up for inflation, regardless of what the market did. The chart below shows what that looks like on a $1,000,000 portfolio, assuming a fairly typical 2.5% annual inflation rate:
What the 4% rule doesn’t guarantee
Notice what’s not in that chart: the stock market. Whether year 8 was a boom year or a crash, the withdrawal still grows by the same inflation adjustment. That consistency is the whole appeal of the 4% rule — it’s simple, and it’s designed to survive a bad multi-decade stretch. But “designed to survive the past” isn’t the same as “guaranteed for your future.” It comes with real caveats worth knowing before you lean on it:
The hidden risk: it’s not just your average return, it’s the order
Same average return, different outcome
Here’s something that surprises most people. Two retirees can earn the exact same average annual return over the same 15 years. They can withdraw the same inflation-adjusted amount every year and start with the same $1,000,000. Yet they can still end up with wildly different results. The only difference is the order the good and bad years happened to arrive in. Financial planners call this sequence-of-returns risk. It’s the risk that a market downturn lands in your first few retirement years, right when you’re also pulling money out.
Why the order matters
Here’s why order matters so much once you’re withdrawing money. It wouldn’t matter at all if you were still saving and never touching the account. When the market drops in a year you’re also withdrawing cash, you’re forced to sell more shares to cover that withdrawal. That permanently locks in a smaller share count — one that can never fully participate in the recovery that follows. A drop later in retirement does far less damage. By then, either the portfolio has had years to grow, or there’s simply less time left for the smaller balance to matter.
Two retirees, side by side
To make this concrete, here are two hypothetical retirees. They both start with $1,000,000 and withdraw the same inflation-adjusted amount every year — the same 4% schedule from the chart above. They also experience the exact same 15 annual market returns, averaging just under 6% a year. The only thing different is the order those returns happen in:
That’s a swing of roughly $400,000 after 15 years — from identical average returns, identical withdrawals, and identical starting balances. Retiree A isn’t unlucky because their investments performed worse on average. They’re worse off purely because the bad years landed early, while they were also withdrawing cash. That forced them to sell a chunk of their portfolio at depressed prices, before it had any chance to recover. This is precisely why a market downturn in your first few retirement years deserves extra caution — and why the strategy below exists.
A practical defense: the 3-bucket strategy
Sequence-of-returns risk comes from being forced to sell investments during a downturn. The fix is straightforward: don’t keep the money you’ll need soon in something that can drop 20% overnight. The “bucket strategy,” popularized by Morningstar’s retirement research team, sorts your savings into three buckets. It groups money by when you’ll actually spend it, not by some one-size-fits-all percentage:
That’s one common “moderate” split, shown on a $1,000,000 portfolio. Your own numbers will depend on your spending needs and risk comfort.
How each bucket works
- Bucket 1 (cash, 1–2 years of expenses): Money you’ll spend almost immediately, kept fully liquid — a savings or money-market account. It never touches the stock market, so a bad year never forces you to sell it at a loss.
- Bucket 2 (bonds, roughly years 3–10): Money you won’t need for a few years, held in high-quality bonds. Bonds are calmer than stocks and generate income you can use to refill Bucket 1 each year.
- Bucket 3 (stocks, year 11 and beyond): Money you won’t touch for a decade or more, invested for growth. This is where you can afford to ride out a downturn. You have years for it to recover before you’ll actually need that cash.
Keeping the buckets filled
Here’s how it works day to day: you spend down Bucket 1 for living expenses. You refill it periodically using bond interest, stock dividends, and — in a good year — some profit-taking from Bucket 3. In a bad year, you simply skip that last step and let Bucket 1 and Bucket 2 carry you until stocks recover. You’re never forced to sell your growth investments at a loss just to pay this month’s bills. That’s exactly the trap that hurt “Retiree A” in the example above.
Putting it together
None of these tools work in isolation, and none of them is a substitute for running your own numbers:
- A starting withdrawal rate — whether it’s 4%, 3.9%, or something else — gives you a reasonable place to begin. It should be based on your own mix of stocks and bonds and how long you expect to need the money.
- Understanding sequence-of-returns risk explains why the first few years of retirement matter so much. A market crash right after you retire is worth planning around, not just hoping to avoid.
- A bucket structure is one concrete way to manage that risk day-to-day, by keeping near-term spending money out of the stock market entirely.
- Above all, the retirees who do best tend to be flexible. They’re willing to trim discretionary spending a bit in a down year. That beats mechanically withdrawing the same amount no matter what the market just did.
Your own timeline, savings mix, and spending needs are unique. The best next step is to run your actual numbers rather than lean on a generic rule of thumb. The Portfolio Analyzer & Withdrawal Simulator lets you test different withdrawal rates and market scenarios against your own portfolio. You can see how sequence-of-returns risk specifically would affect your plan — not just a hypothetical $1,000,000 example.