The 4% Rule: How Much Can You Safely Spend From Your Savings in Retirement?

Short answer: The 4% rule is a rough starting guide, not a law. It says that in your first year of retirement you can withdraw 4% of your savings, then adjust that dollar amount for inflation each year, and — based on U.S. market history — your money should last about 30 years. On a $1 million portfolio, that is $40,000 in year one. It is a useful back-of-the-envelope estimate, but it was built on specific assumptions, and some researchers now suggest a lower starting figure while others argue you can safely spend more. Treat 4% as a sensible anchor, not a promise, and stay flexible.

Where did the 4% rule come from?

The rule traces back to a 1994 study by financial planner William Bengen, who wanted to answer a simple question: how much could a retiree pull from a portfolio each year without running out of money? Using historical U.S. market returns, Bengen tested a portfolio split between American large-cap stocks and Treasury bonds and found that a retiree who withdrew 4% in the first year and adjusted that amount for inflation afterward would not have run out of money over any 30-year period in the data he examined. ^[1] A few years later, a separate paper by three Trinity University professors — now known as the Trinity Study — reached a similar conclusion, describing "withdrawal rates of 3% and 4%" as "exceedingly conservative." ^[2] That agreement is how a single planner's research became a rule of thumb repeated for decades.

How does the 4% rule actually work?

This is the part most people get wrong. The 4% is used once — in your very first year. After that, you do not take 4% of whatever the account is currently worth. You take the same dollar figure and adjust it for inflation. ^[4]

Say you retire with $1 million. In year one you withdraw 4%, or $40,000. If inflation runs 3% that year, in year two you withdraw $41,200 — regardless of whether the market went up or down. You keep giving yourself that inflation-adjusted "paycheck" each year. The point of the rule was never to track the market; it was to give a retiree steady, predictable spending power that history suggested a balanced portfolio could support for three decades.

Does the 4% rule still hold up today?

That is where the debate lives, and honest experts land in different places. The rule was built on past returns, and future returns are unknown. Two forces pull the "safe" number in opposite directions.

On one side, some researchers say 4% may be too high right now. In its 2025 research, Morningstar recommended a starting withdrawal rate of 3.7% for a newly retiring investor — "down from 4% in 2024" — pointing to "higher equity valuations and lower bond yields," which lower the returns a portfolio is likely to earn going forward. ^[3] Morningstar's figure assumes a 30-year retirement and aims for roughly a 90% probability that the money lasts. On a $1 million portfolio, 3.7% is $37,000 in the first year rather than $40,000.

On the other side, Bengen himself has argued the original number was cautious. In a 2025 book revisiting his work, he broadened the mix of assets in the portfolio and raised his own suggested figure to 4.7%. ^[1] His reasoning: a more diversified portfolio, spread across more types of stocks, can support a somewhat higher rate than his original two-asset test did.

Both can be true at once. The safe rate is not a fixed constant — it moves with how a portfolio is built, how long you expect to live off it, and what markets do in your first years of retirement.

Why do the first few years matter so much?

Because of something called sequence-of-returns risk. Two retirees can earn the exact same average return over 30 years and end up in completely different places, purely based on the order those returns arrive. If the market falls hard in your first few years while you are also pulling money out, you are selling investments at low prices, and the portfolio may never fully recover — even if strong years follow later. A retiree who hits a rough patch late has already banked years of growth; one who hits it early can be in real trouble. This is why the same withdrawal rate that is comfortable over 20 years gets riskier stretched over 35, and why it pays to stress-test your portfolio against bad early years rather than assume smooth, average returns.

What does the 4% rule get right?

Its greatest strength is that it exists at all. Before Bengen, "how much can I spend?" often got answered with a shrug or a sales pitch. The rule gives ordinary people a fast, memorable anchor: multiply your annual spending by 25 and you have a rough savings target, or take 4% of what you have saved and you have a rough starting income. It builds in inflation, which Bengen has called retirees' greatest long-run threat, and it is grounded in real market history rather than wishful thinking. As a "useful barometer" and a "back-of-the-envelope estimate," it does its job well. ^[4]

Where does the 4% rule fall short?

The same rigidity that makes it easy to remember makes it a poor fit for real life. Nobody spends the exact same inflation-adjusted amount every year for 30 years. Real spending tends to be higher early in retirement, dip in the middle, and rise again late if health costs climb. The rule also ignores one of the biggest and least predictable expenses retirees face — long-term care — which usually arrives at the very end, exactly when a rigid formula has the least room to absorb it. ^[4] And because it is built on U.S. history, it assumes the future will rhyme with the past. It might not.

There is also a quieter failure that gets less attention: underspending. A retiree who clings too tightly to a conservative rule can reach the end of life with a large unspent balance, having denied themselves trips, gifts, and comfort they could easily have afforded. Running out of money is the obvious fear; leaving the market's gains unlived is the mirror-image mistake.

What are the alternatives to a fixed 4%?

The most common fix is to make withdrawals flexible instead of fixed. One well-known approach, the "guardrails" strategy introduced by advisers Jonathan Guyton and William Klinger in 2006, lets your withdrawal rate rise or fall with your portfolio: you give yourself a small raise after strong years and trim spending after bad ones. ^[4] It typically supports a higher average income than the rigid rule, at the cost of a variable paycheck — and it only works if you are actually willing to cut back when markets fall, which many people find hard to do.

Others use simple common sense: skip the inflation raise in a down year, keep a cash cushion so you are not forced to sell stocks after a drop, or revisit the plan annually rather than setting it once and walking away. The unifying idea is that a living retiree can adjust, while a formula cannot.

So how should you actually use it?

Use the 4% rule the way you would use a recipe's suggested cooking time — as a starting estimate you check and adjust, not a guarantee. Run the number to see roughly how much income your savings could support, or how much you would need to save to fund the life you want. Then stay flexible: be ready to spend a little less after a bad market year, especially early in retirement, and comfortable spending a little more after good ones. If your retirement could stretch well beyond 30 years, or your portfolio is heavy in stocks, lean toward the cautious end of the range. And because the stakes are high and personal, this is one area where a one-time check from a fee-only, fiduciary adviser can be money well spent.

Frequently asked questions

Is the 4% rule still valid? It is still a reasonable starting point, but it is contested. Morningstar's 2025 research put the safe starting rate at 3.7%, while Bengen's own 2025 update raised his figure to 4.7%. The honest takeaway is that the "safe" number is a range that depends on your portfolio and time horizon, not a single fixed percentage.

Do I really only use 4% once? Yes. You withdraw 4% of your savings in the first year, then adjust that same dollar amount for inflation each year after. You do not recalculate 4% of the new balance annually — that is a common misunderstanding.

How is the 4% rule different from saving for retirement? Saving is the accumulation phase — building the pile, often through steady, automatic investing from each paycheck. The 4% rule is about the opposite phase: how to spend the pile down without exhausting it.

What if I retire early? The rule was built for roughly a 30-year retirement. If you expect to fund 40 or more years, most researchers suggest starting with a lower rate — closer to 3% to 3.5% — to give the portfolio more margin against a long horizon and bad early years.

This article is financial education, not financial advice. It does not account for your personal situation, and TopHolding is not your financial adviser. Consider speaking with a qualified professional before making decisions about retirement withdrawals.

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