The 4% Rule for Retirement Withdrawals Explained

The 4% rule is a guideline that says you can withdraw about 4 percent of your retirement savings in the first year, then adjust that dollar amount for inflation each year, with a good chance the money lasts about 30 years. On a 1 million dollar portfolio that first-year withdrawal is 40,000 dollars. It comes from the Trinity study and is a starting point, not a guarantee.

What Is the 4% Rule?

The 4% rule is a simple withdrawal guideline for retirement. In your first year of retirement you take out 4 percent of your total savings. In every year after that, you keep the same dollar amount but increase it to keep pace with inflation. The idea is that a portfolio holding a mix of stocks and bonds has historically supported that pattern of spending for roughly 30 years.

Notice what the 4 percent applies to. It is a share of your starting balance, calculated once. It is not 4 percent recalculated on your shrinking or growing balance every year. After year one you stop thinking in percentages and simply give last year’s withdrawal a raise for inflation. That single detail is where most confusion about the safe withdrawal rate begins, so it is worth fixing in your mind early.

The rule is popular because it turns an overwhelming question, how much can I spend without running out, into one starting number. To pressure-test that number against your own balance and time horizon, the Retirement Withdrawal Calculator lets you enter your savings and see the withdrawals the 4% rule would produce.

How the 4% Rule Works: A Simple Example

Suppose you retire with 1 million dollars. Multiply by 0.04 and your first-year withdrawal is 40,000 dollars. That is the money you live on across your first 12 months of retirement, on top of any Social Security or pension income.

Now move to year two. You do not take 4 percent again. Instead you take last year’s 40,000 dollars and add inflation. If prices rose 3 percent, your year-two withdrawal is 41,200 dollars. In year three you add inflation to that figure, and so on. Your spending power stays roughly steady even as the cost of living climbs, which is the whole point of the inflation adjustment.

The market does the rest in the background. In strong years your balance can grow even after the withdrawal; in weak years it can shrink faster. The 4% rule is the bet that, over a long enough horizon, the good and bad years average out to keep the plan intact for about three decades.

First-Year Withdrawal by Portfolio Size

Because the first-year number is just 4 percent of your balance, you can read it straight off your savings total. The table below shows the year-one withdrawal the 4% rule produces at several common portfolio sizes. Every figure is simply the balance multiplied by 0.04.

The relationship is perfectly straight: double the savings and you double the first-year withdrawal. The chart below shows the same five portfolios and their year-one withdrawals side by side.

Where the 4% Rule Came From: The Trinity Study

The rule did not appear out of nowhere. It grew out of research in the 1990s, most famously a paper by three finance professors at Trinity University, now widely called the Trinity study. They asked a direct question: if a retiree pulled a fixed, inflation-adjusted amount from a stock-and-bond portfolio, what starting withdrawal rate would have survived the worst 30-year stretches in market history?

Their answer, for a portfolio weighted toward stocks, landed near 4 percent. At that rate, the historical test periods they studied almost always left the retiree with money at the end of 30 years, and often with a balance larger than they started with. Higher rates, like 5 or 6 percent, failed far more often, especially when a retirement began just before a major downturn.

Two things are worth remembering about that origin. First, it is built on past market returns, and markets shaped by different interest rates and valuations can behave differently. As the U.S. Securities and Exchange Commission explains through its investor education materials on how stock markets work, prices move with supply, demand, and countless events no model can predict. Second, the study measured whether money simply lasted, not whether the ride was comfortable. A plan can technically succeed on paper while still forcing a retiree through some deeply nervous years.

Adjusting for Inflation Each Year

The inflation adjustment is what separates the 4% rule from simply spending 4 percent forever. Prices tend to rise over time, so a fixed 40,000 dollars would buy noticeably less after a decade. To protect your standard of living, the rule raises your withdrawal each year by the inflation rate, so your real spending power stays roughly flat.

The chart below traces the first several years of a 40,000 dollar starting withdrawal, assuming a steady 3 percent inflation rate for illustration. The withdrawal climbs a little each year even though the underlying rule never changes.

Real inflation is not a smooth 3 percent, of course. Some years run hotter and some cooler, and the compounding of those raises is a big part of why long horizons matter. If you want to see how a fixed sum grows or erodes over time, the Future Value Calculator illustrates the effect of compounding across many years.

Withdrawal Rate and Sustainability

The 4 percent figure is a chosen balance point, not a magic number. Withdraw less and your money is very likely to outlast you; withdraw more and the odds of running short climb quickly. The table below gives a rough, general sense of how the starting withdrawal rate relates to sustainability over a long retirement.

These are broad tendencies, not precise probabilities, and your own result depends on your mix of investments, fees, taxes, and above all the order of your returns. That last factor deserves its own section.

The Criticisms and Limits of the 4% Rule

The 4% rule is a useful starting frame, but it has real weaknesses, and understanding them is what keeps it from being misused.

Sequence-of-Returns Risk

The single largest risk is the order in which your returns arrive. Two retirees can earn the exact same average return over 30 years and end up in completely different places, purely because one hit a market crash early and the other hit it late. A steep drop in your first few years, while you are also withdrawing, can shrink the balance so much that later recoveries never fully catch up. This is called sequence-of-returns risk, and the fixed-withdrawal design of the 4% rule is especially exposed to it.

Low-Yield and High-Valuation Environments

The Trinity study drew on a specific slice of market history. Critics point out that periods of very low bond yields or high stock valuations can make future returns lower than the past average, which would pressure any fixed withdrawal rate. When safe assets pay little, the cushion that helped past retirees is thinner. The SEC’s investor education on how to save and invest stresses that all investing carries risk and that past performance never guarantees future results.

It Ignores Real Spending and Flexibility

Real retirees do not spend a rigid, inflation-adjusted line. Costs jump for a new roof or a medical event and ease in quieter years. Many planners argue the 4% rule is too rigid, and that a flexible approach, trimming withdrawals a little after bad market years, can meaningfully improve the odds. The rule also assumes a 30-year horizon, which may be too short for an early retiree and longer than needed for someone who retires later.

How the 4% Rule Fits Your Bigger Plan

The 4% rule answers the spending side of retirement, but it assumes you have already built the nest egg. Two sibling questions sit on either side of it. On the front end, figuring out your target balance is its own exercise; our guide on how much you need to retire works through that number. Along the way, it helps to know whether you are on pace, which is where our retirement savings by age benchmarks come in. The 4% rule then takes over once you stop saving and start spending.

FAQs About the 4% Rule

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Educational note: This article is general information, not financial, tax, or investment advice. The 4% rule is a historical guideline built on assumptions about markets and inflation, and it does not guarantee that any particular portfolio will last. Your own results depend on your investments, fees, taxes, spending, and the order of market returns. Speak with a licensed financial professional before setting a withdrawal plan. Reviewed for accuracy by Prof. Dr. Khalil Mudassar, PhD, as part of our editorial review process. Content last reviewed September 10, 2026.