The 4% Rule for Retirement Withdrawals Explained

What Is the 4% Rule for Retirement Withdrawals?

If you’ve ever wondered how much money you can safely take out of your savings each year in retirement, you’ve probably come across the 4% rule for retirement withdrawals. It’s one of the most widely discussed concepts in personal finance — and for good reason. It gives beginners a concrete, easy-to-understand starting point for one of retirement planning’s trickiest questions: how do I make my money last?

In plain English, the 4% rule says this: withdraw 4% of your total portfolio value in your first year of retirement, then adjust that dollar amount for inflation each following year. If your investments are spread between stocks and bonds in a reasonable mix, historical data suggests your portfolio has a strong chance of surviving at least 30 years.

This article breaks down where the rule came from, how to apply it with a real example, its known limitations, and what you should consider before making it your retirement plan.

Where Did the 4% Rule Come From?

The rule traces back to financial planner William Bengen, who published research in 1994 analyzing historical stock and bond returns going back decades. He found that a retiree who withdrew 4% of their portfolio in year one — and adjusted for inflation thereafter — had never run out of money over any 30-year period in recorded U.S. market history.

Shortly after, researchers at Trinity University published what became known as the Trinity Study, which confirmed and expanded Bengen’s findings. Their analysis covered different portfolio mixes (more stocks vs. more bonds) and different time horizons, giving the 4% figure wide credibility in the financial planning world.

You can explore more about retirement income research through resources published at Investor.gov, the SEC’s investor education platform, which offers plain-language retirement planning tools.

How the 4% Rule Works: A Step-by-Step Example

Let’s walk through a hypothetical illustration. Suppose you retire with a $1,000,000 portfolio invested roughly 60% in stocks and 40% in bonds — a common moderate allocation.

1. Year 1: You withdraw 4% of $1,000,000 = $40,000 to cover your living expenses.
2. Year 2: Inflation runs at 3% that year, so you increase your withdrawal by 3%. You take out approximately $41,200.
3. Year 3 and beyond: You continue adjusting annually for inflation, regardless of how your portfolio performs that year.

This approach means your spending power stays roughly constant in real terms over time. The portfolio keeps the remainder invested, ideally continuing to grow to offset both withdrawals and inflation.

Important: This is a simplified illustration only. Actual returns are never guaranteed, and sequence-of-returns risk — experiencing poor markets early in retirement — can significantly affect outcomes.

The “Multiply by 25” Shortcut for Saving

A handy companion to the 4% rule is the “multiply by 25” rule for calculating your retirement savings target. Here’s the logic: if you plan to withdraw 4% per year, then 4% × 25 = 100%, meaning 25 times your annual spending equals the total portfolio you’d need.

• Annual spending of $30,000 → Target portfolio: $750,000
• Annual spending of $50,000 → Target portfolio: $1,250,000
• Annual spending of $80,000 → Target portfolio: $2,000,000

These numbers are purely illustrative and assume average historical market returns. They also don’t account for Social Security, pensions, or other income sources — all of which could reduce how much you need to withdraw from your portfolio each year.

Limitations of the 4% Rule You Must Understand

The 4% rule is a guideline, not a guarantee. Before you rely on it, you need to understand its real-world limitations.

It Was Built on U.S. Historical Data

The original research used U.S. stock and bond market returns from the 20th century — a period of exceptional growth. Applying those same assumptions to your future retirement is not risk-free, especially as markets and interest rate environments evolve.

It Assumes a 30-Year Retirement

If you retire at 55 instead of 65, you could need your money to last 40 years or more. Some financial planners now suggest a 3% to 3.5% withdrawal rate for longer retirements or more conservative investors — especially given periods of lower expected returns from bonds.

It Doesn’t Account for Big Life Changes

Healthcare costs, a divorce, helping family members financially, or a long period of market decline early in retirement can all derail a plan built solely on the 4% rule. Flexibility matters.

Sequence of Returns Risk Is Real

If markets fall sharply in your first few years of retirement — and you’re still selling assets to fund withdrawals — you can permanently damage your portfolio’s ability to recover. This is known as sequence-of-returns risk, and it’s one of the most important concepts retirees often overlook.

What You Should Actually Hold in Your Portfolio

The 4% rule was modeled on portfolios holding a meaningful allocation to stocks — typically 50% to 75% equities. A portfolio sitting entirely in cash or low-yield savings accounts is unlikely to sustain 30+ years of inflation-adjusted withdrawals.

For beginners building a long-term retirement portfolio, low-cost index funds are often recommended by financial educators as a cost-efficient, diversified foundation. Learn more about building your investment base in our guide to the best index funds for beginners.

To actually invest in those funds, you’ll need a brokerage account. Providers like Fidelity and Charles Schwab are well-known for offering commission-free trading and no account minimums on many account types — though you should always check their current terms directly, as fees and features change. Our roundup of the best brokerage accounts for beginners covers what to look for when choosing a platform.

Practical Tips for Using the 4% Rule Wisely

• Treat it as a floor, not a ceiling. In good market years, consider withdrawing slightly less to give your portfolio a buffer.
• Factor in all income sources. Social Security payments, rental income, or a part-time job all reduce how much you need to pull from your portfolio.
• Revisit annually. Your withdrawal rate should be reviewed every year as your portfolio value, spending needs, and life circumstances change.
• Work with a fee-only financial planner if your situation is complex. The SEC’s SEC.gov investor guidance is also a useful starting point for understanding retirement planning risks.
• Don’t ignore taxes. Withdrawals from traditional 401(k)s and IRAs are taxed as ordinary income. The type of account you withdraw from matters.

The 4% Rule as a Starting Point, Not a Finish Line

Knowing what the 4% rule for retirement withdrawals is gives you a powerful mental framework, but the smartest retirees treat it as a starting conversation, not a fixed formula. Markets are unpredictable, life is messy, and no single percentage will be right for every person in every situation.

Use the rule to set a savings target, benchmark your progress, and begin thinking about how much your portfolio actually needs to generate. Then get specific: understand your expected expenses, your other income sources, and your true retirement timeline before committing to any withdrawal strategy.

Frequently Asked Questions

What is the 4% rule for retirement withdrawals?

The 4% rule is a retirement income guideline suggesting that if you withdraw 4% of your total portfolio in your first year of retirement, then adjust that amount for inflation each subsequent year, your savings have a strong historical probability of lasting at least 30 years.

Where did the 4% rule come from?

The rule originated from the 1994 research of financial planner William Bengen and was later reinforced by the Trinity Study, in which researchers at Trinity University analyzed decades of historical stock and bond returns. They found that a 4% initial withdrawal rate gave retirees a high likelihood of not running out of money over a 30-year retirement.

Is the 4% rule still valid in 2026?

Many financial experts still use the 4% rule as a starting benchmark, but some now suggest a slightly lower rate — such as 3% to 3.5% — may be more appropriate given lower expected bond returns and longer life expectancies. It remains a useful planning tool but should not be followed rigidly without considering your personal situation.

What portfolio size do I need for the 4% rule to work?

To find your target portfolio size using the 4% rule, multiply your expected annual retirement spending by 25. For example, if you plan to spend $40,000 per year, you would aim for a $1,000,000 portfolio. This is a rough illustration only and assumes historical average market returns, which are never guaranteed.

This article is for educational purposes only and does not constitute financial or investment advice. Investing involves risk, including the possible loss of principal. Past performance does not guarantee future results. Always do your own research, and consider speaking with a licensed financial professional before making investment decisions.