A historical finding
Not a promise about the future.
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401(k) basics: don’t leave free money behindIRAs: your own retirement accountRoth vs. Traditional IRA: which is right for you?The backdoor Roth IRAThe HSA: the most tax-friendly account you're not usingSocial Security: when to claimThe 4% rule and safe withdrawalsRequired minimum distributions (RMDs)Early withdrawals and the 72(t) exception
The 4% rule and safe withdrawals
A rule of thumb from historical research for how much a retirement portfolio might support — useful as a starting point, not a promise.
In this lesson you will
- Explain where the 4% rule came from
- Use ×25 to estimate a target
- List the rule’s limits
The “4% rule” comes from research by financial planner William Bengen in the 1990s. Using historical US market data, he found that withdrawing 4% of a portfolio in the first year of retirement, then adjusting that amount for inflation each year, would have lasted at least 30 years in every period he studied.
How to use it as a rough guide
Multiply your desired yearly withdrawal by 25 to estimate the portfolio it implies (25 × 4% = 100%). Wanting $40,000 a year from savings implies about $1,000,000.
Why it is not a guarantee
- It is based on past US returns, which may not repeat.
- It assumes a particular mix of stocks and bonds and a 30-year retirement.
- Fees, taxes and a longer retirement change the result.
- Bad returns early in retirement matter more than later ones.
Flexible withdrawals
Many planners suggest adjusting withdrawals to markets — spending a little less after bad years. Combined with Social Security and any pension, this can make a plan more resilient.
By the GetGuac team · Editorial policy
Three ideas to keep
×25 is a quick target
Yearly withdrawal × 25.
Early years matter most
Sequence of returns risk.
Do it in 4 steps
Estimate yearly spending in retirement
From today’s spending.
Subtract guaranteed income
Social Security, pensions.
Multiply the gap by 25
A rough target.
Review with a professional
As retirement nears.
From spending to a rough target
Illustrative: $55,000 yearly spending and $25,000 from Social Security.
| Step | Amount |
|---|---|
| Yearly spending | $55,000 |
| Minus Social Security | −$25,000 |
| Gap from savings | $30,000 |
| × 25 (4% rule of thumb) | $750,000 |
A starting point for planning, not a guarantee the money will last.
Where this usually goes wrong
- Treating 4% as guaranteed
- Ignoring taxes and fees
- Not adjusting after bad market years
Estimate your yearly retirement gap and multiply it by 25.
Tools and guides for this lesson
Quick quiz
1. The 4% rule is based on…
2. A quick target from the rule is…
3. Which matters most to how long money lasts?
0 of 3 answered
Puzzle
You expect to need $36,000 a year from savings. What portfolio does the 4% rule of thumb suggest?
Show the answer
$900,000
$36,000 × 25 = $900,000 (equivalently $36,000 ÷ 0.04).