The 4% rule is a retirement withdrawal guideline stating you can withdraw 4% of your portfolio in the first year of retirement, then adjust that amount for inflation each year, and have a high probability of not running out of money over 30 years.

Is the 4% rule still valid?

The 4% rule is a useful starting point but not a guarantee. Some researchers now suggest 3.3%-3.5% for more conservative planning, while others argue dynamic withdrawal strategies are more appropriate than a fixed rule.

How much do I need to retire using the 4% rule?

Multiply your desired annual spending by 25. For $40,000/year, you need $1,000,000. For $60,000/year, you need $1,500,000. For $100,000/year, you need $2,500,000.

The 4% Rule: How Much Can You Safely Withdraw in Retirement?

The 4% rule is the most cited guideline in retirement planning. Developed by financial planner William Bengen in 1994, it provides a simple framework for how much you can safely withdraw from your retirement savings each year.

How the 4% Rule Works

Year 1: Withdraw 4% of your total portfolio value
Subsequent years: Adjust the withdrawal by the inflation rate
Result: A high probability (~95%) of your money lasting at least 30 years

The Math: How Much You Need

The inverse of the 4% rule gives you the “multiply by 25” rule — multiply your desired annual spending by 25 to find your target nest egg:

Desired Annual Spending	Portfolio Needed (25x)	Monthly Withdrawal
$30,000	$750,000	$2,500
$40,000	$1,000,000	$3,333
$50,000	$1,250,000	$4,167
$60,000	$1,500,000	$5,000
$80,000	$2,000,000	$6,667
$100,000	$2,500,000	$8,333
$150,000	$3,750,000	$12,500

Example: $1.2 Million Portfolio

Year	Withdrawal	Inflation Adj.	Remaining Portfolio*
1	$48,000 (4%)	—	$1,152,000
5	$52,500	3%/year	$1,189,000
10	$60,800	3%/year	$1,195,000
15	$70,500	3%/year	$1,140,000
20	$81,700	3%/year	$1,008,000
25	$94,700	3%/year	$782,000
30	$109,800	3%/year	$438,000

*Assumes 7% nominal return on a 60/40 portfolio.

Historical Success Rate

Bengen’s original research, and the subsequent Trinity Study, tested the 4% rule against every 30-year period in U.S. market history:

Withdrawal Rate	Success Rate (30 years)	Success Rate (40 years)
3.0%	100%	100%
3.5%	100%	98%
4.0%	95%	87%
4.5%	82%	68%
5.0%	68%	49%

The 5% failures at 4% occurred during periods of very high inflation (1960s-70s) combined with poor early-retirement stock returns.

Limitations of the 4% Rule

1. Based on U.S. Historical Data

The 4% rule uses U.S. stock and bond returns from 1926 onward. Future returns may be lower, particularly if current valuations and interest rates don’t revert to historical norms.

2. Fixed Spending Is Unrealistic

Most retirees don’t spend the same inflation-adjusted amount every year. Spending typically follows a “smile” pattern — higher in early retirement (travel, activities), lower in mid-retirement, and higher again in late retirement (healthcare).

3. 30-Year Horizon May Not Be Enough

For early retirees or those retiring at 60, a 30-year horizon may be insufficient. A 40-year horizon suggests a 3.3-3.5% rate.

4. Ignores Taxes

The 4% rule doesn’t account for the tax impact of withdrawals. $40,000 from a Traditional IRA is worth less than $40,000 from a Roth IRA.

5. Sequence of Returns Risk

Poor market returns in the first few years of retirement can devastate a portfolio even if long-term averages are fine. This “sequence risk” is the biggest threat to the 4% rule’s success.

Modern Alternatives to the 4% Rule

The 3.3% Rule (More Conservative)

Researchers like Wade Pfau suggest 3.3% may be more appropriate given current market conditions, especially for early retirees or those prioritizing safety.

The Guardrails Method

Set upper and lower spending boundaries:

If your portfolio grows significantly, increase withdrawals (up to a cap)
If your portfolio declines below a threshold, temporarily reduce withdrawals

Dynamic Spending

Adjust withdrawals each year based on portfolio performance rather than a fixed percentage. Spend more after good years, less after bad years.

The Bucket Strategy

Divide your portfolio into buckets:

Bucket 1 (1-2 years): Cash and short-term bonds for immediate spending
Bucket 2 (3-7 years): Bonds and moderate-risk investments
Bucket 3 (8+ years): Stocks for long-term growth

Refill Bucket 1 from Bucket 2, and Bucket 2 from Bucket 3 as markets allow.

Adjusting for Early Retirement

If you retire before 65, the 4% rule may need modification:

Retirement Age	Years Until ~90	Suggested Rate
65	25	4.0%
60	30	3.7%
55	35	3.5%
50	40	3.3%
45	45	3.0%

FIRE (Financial Independence, Retire Early) adherents often plan for 3.0-3.5% withdrawal rates to account for longer time horizons.

For most retirees, Social Security covers a portion of expenses, meaning the 4% rule only needs to cover the gap:

Annual Spending	Social Security	Withdrawal Needed	Portfolio Needed
$50,000	$24,000	$26,000	$650,000
$70,000	$24,000	$46,000	$1,150,000
$70,000	$40,000 (couple)	$30,000	$750,000
$100,000	$40,000 (couple)	$60,000	$1,500,000

Social Security dramatically reduces the portfolio needed, especially for moderate spenders.