The 4% Rule: How Much Can You Safely Spend in Retirement?
The 4% rule says you can spend 4% of your savings in your first year of retirement, then adjust for inflation each year, with a high chance your money lasts 30 years. Here’s how it works and where it falls short.
By Bogdan · Updated
The 4% rule is the most famous rule of thumb in retirement planning. It answers a simple but scary question: how much can I spend each year without running out of money?
Explain it like I’m 5
Imagine a big jar of cookies that magically grows a few new cookies every year — but not the same number every year. Some years lots of new cookies appear, some years a few disappear.
The 4% rule says: if you eat 4 out of every 100 cookies in the first year, and then just a tiny bit more each year as cookies get “more expensive”, the jar has almost always lasted at least 30 years in the past. Eat more than that, and the jar might run empty too soon.
Want to know when you’ll have enough? The Coast FIRE calculator uses your withdrawal rate to find your target.
How to use it
- Year 1: take 4% of your portfolio. With $1,000,000, that’s $40,000.
- Year 2 and after: take last year’s amount plus inflation. If inflation was 3%, year 2 is $41,200 — no matter what the market did.
- Keep investing the rest, typically in a mix of stocks and bonds.
The 25× rule: your target number
Flip the 4% rule around and you get your FIRE number:
Savings needed = yearly spending × 25
| Yearly spending from savings | At 4% (×25) | At 3.5% (×28.6) |
|---|---|---|
| $30,000 | $750,000 | $857,143 |
| $40,000 | $1,000,000 | $1,142,857 |
| $60,000 | $1,500,000 | $1,714,286 |
| $80,000 | $2,000,000 | $2,285,714 |
Only count spending your savings must cover — subtract Social Security, pensions or rental income first.
Where the 4% rule came from
In 1994, financial planner William Bengen tested US market history back to the 1920s. He found that withdrawing 4% at the start and adjusting for inflation never ran out of money within 30 years with a mix of stocks and bonds — even for people who retired just before the Great Depression or the 1970s. The Trinity Study (1998) reached similar conclusions. Bengen has since suggested a somewhat higher starting rate, around 4.7%, when using a more diversified portfolio.
Where it falls short
- Longer retirements. Retiring at 40 means 50+ years. Lower rates (3%–3.5%) are safer.
- Bad early years. A market crash right after you retire (sequence-of-returns risk) does the most damage.
- Fees and taxes aren’t included — a 1% fee eats a quarter of a 4% withdrawal.
- Real life isn’t a straight line. Many retirees spend more early on, less in their 70s, and more again on health care later.
- It’s based on US history, which was one of the best-performing markets in the world.
Smarter, flexible versions
- Guardrails: cut spending a little after bad years and allow raises after good ones.
- Cash buffer: keep 1–2 years of spending in cash so you don’t sell stocks in a crash.
- Floor and upside: cover essentials with guaranteed income (Social Security, annuities) and use investments for extras.
The 4% rule is a great planning target — just treat it as a starting point you’ll adjust, not a promise.
Frequently asked questions
What is the 4% rule in simple terms?
In your first year of retirement, spend 4% of your savings. Every year after that, spend the same amount plus inflation. Historically, a mix of stocks and bonds handled this for at least 30 years in almost every period tested.
How much do I need to retire using the 4% rule?
Multiply your yearly spending by 25. To spend $40,000 a year, you need about $1,000,000; to spend $60,000, about $1,500,000. Subtract any income you’ll get from elsewhere, like Social Security or a pension, before multiplying.
Is the 4% rule still valid?
It remains a useful starting point, but it’s a rule of thumb, not a guarantee. It was based on 30-year US retirements. For early retirees with 40 or 50 years ahead, many planners suggest 3.25% to 3.5%; others argue for more flexible spending that rises and falls with the market.
Does the 4% rule include inflation?
Yes. The 4% applies only to the first year. After that, you increase the dollar amount each year by inflation, regardless of how your investments did.
What is the 25x rule?
It’s the 4% rule flipped around: 1 ÷ 4% = 25, so you need 25 times your yearly spending saved. With a 3.5% withdrawal rate, it becomes about 28.6 times.
This article is for general education and is not financial, investment or tax advice. Rates, rules and limits change; check current terms with your bank or the IRS. See our disclaimer.