Bill Bengen's 1994 "4% rule" was based on the worst retirement start dates in US market history — including the 1966 retiree who faced 15 years of stagflation. He found that a 4% initial withdrawal rate, adjusted annually for inflation, survived even those worst-case 30-year scenarios with a 60/40 portfolio. It became the bedrock of retirement planning for three decades.
Then came 2022-2024: two of the worst years for balanced portfolios in recent memory. A 60/40 portfolio dropped 16% in 2022. Followed by 17% recovery in 2023 and solid 2024. Anyone who retired in late 2021 at the market peak and started 4% withdrawals faced sequence-of-returns risk in dramatic fashion. The question became: does the 4% rule still work after this?
What the 4% Rule Actually Says
Bengen's original formulation:
- Retire with a diversified portfolio (his work used 50-70% stocks, 30-50% intermediate-term Treasuries)
- In year 1, withdraw 4% of initial portfolio value
- Each subsequent year, adjust the dollar amount for inflation (not portfolio value)
- Over a 30-year retirement, the portfolio is highly likely to survive
Example: $1M starting portfolio. Year 1 withdrawal: $40,000. If inflation is 3% that year, year 2 withdrawal is $41,200. If inflation is 5% in year 2, year 3 withdrawal is $43,260. Withdrawals ignore whether the portfolio went up or down.
The rule is about sequence of returns, not average returns. A 5% average return with good early years is survivable; the same average with bad early years can fail the portfolio.
The 2022 Test Case
Someone retiring January 1, 2022 with $1M in a 60/40 portfolio:
- Year 1 (2022): withdrew $40K, portfolio declined 16% = $806K end of year
- Year 2 (2023): withdrew ~$42K (inflation-adjusted), portfolio recovered 17% = $894K
- Year 3 (2024): withdrew ~$43K, portfolio grew ~11% = ~$945K
After 3 years, this retiree has about $945K — 5.5% below starting balance, but far better than the worst-case scenarios Bengen modeled. The market recovered meaningfully from 2022 lows.
Compare to worst historical period (1966 retiree): after 10 years, portfolio was at 40% of starting balance. 2022's 16% drop was nothing by historical standards — it felt bad because recency bias, but mathematically it was a mild drawdown.
What Academic Updates Say
Bengen updated his research in 2020, accounting for lower bond yields and higher starting valuations. His conclusion: 4% is still safe, but 4.5% is safer with certain adjustments.
Morningstar's annual "State of Retirement Income" reports (2022-2024) concluded:
- 3.8-4.0% is the current safe withdrawal rate for 30-year retirement with 60/40 portfolio
- Lower bond yields reduce cushion, but higher stock earnings yields offset
- The rule still works, marginally weakened
More recent research (Blanchett, Finke, Pfau) suggests:
- Dynamic withdrawal strategies (adjusting withdrawals based on portfolio performance) can support higher initial rates
- "Guardrails" approach allows 5%+ initial withdrawals with discipline
- Glide-path strategies (starting with more bonds, adding stocks over time) have interesting properties
The Sequence Risk Reality
The 4% rule's math works because of sequence risk, not return averages.
Retire into rising market (2009, 2020): portfolio grows faster than you withdraw. Future years benefit.
Retire into falling market (2000, 2008, 2022): portfolio shrinks while you withdraw. Compounding against you. Harder to recover.
The worst 5-year periods to retire (post-WWII): 1966-1970, 1973-1977, 2000-2004. All saw sustained bear markets. 2022 was a blip by comparison (one-year drop, then recovery).
The Current Environment
Late-2025 market conditions:
- S&P 500 at or near all-time highs (valuation moderately elevated)
- Shiller P/E around 32 (historically high)
- Bond yields around 4-5% (much higher than 2010-2022 zero-rate era)
- Inflation moderating but above Fed target
The implication: stocks may underperform historical averages, bonds may outperform recent history. Net effect on 4% rule: probably similar to historical safe rate, with different drivers.
Dynamic Withdrawal Strategies
Rather than rigid 4% rule, some researchers advocate:
Guyton-Klinger guardrails:
- Start with 5% withdrawal rate
- Increase withdrawals by inflation annually (normal)
- If current withdrawal rate exceeds 6% of portfolio (bad market), cut withdrawal by 10%
- If current withdrawal rate falls below 4% of portfolio (good market), increase withdrawal by 10%
This approach adjusts to market conditions. In bad markets, you tighten belts. In good markets, you spend more. Over 30 years, total withdrawals are similar to 4% rule but more responsive.
Variable Percentage Withdrawal (Steiner):
- Calculate withdrawal as X% of current portfolio value
- X varies based on age and life expectancy
- Provides fully responsive withdrawals
This eliminates sequence risk entirely at the cost of income volatility. If portfolio drops 30%, your income drops 30%. Realistic only for retirees with other secure income (pensions, Social Security, annuities).
The 3.5% Conservative Approach
For early retirees (40-50 years old with 40-50 year time horizons), the 4% rule is too aggressive. 30-year backtesting doesn't generalize to 50 years.
Morningstar's research on 50-year retirements suggests 3.0-3.3% is the safer initial rate. This is the core uncertainty for FIRE adherents who want to retire in their 40s.
For mid-life retirement (58-65), 4% remains reasonable. For traditional retirement age (67+), 4% is conservative — 4.5% is often defensible.
The Asset Allocation Matters
The 4% rule assumes 50-75% stocks. Lower stock allocations fail the 4% test in high-inflation scenarios. Higher stock allocations add volatility but usually survive.
Current research consensus: 60-80% stocks is optimal for 30-year retirement with 4% withdrawal. Anything below 50% stocks has elevated failure risk. Anything above 90% stocks has elevated volatility but similar success rates.
The classic 60/40 remains close to optimal. 70/30 or 65/35 defensible.
The Social Security Factor
The 4% rule ignores Social Security. In reality, most retirees receive Social Security benefits that reduce required portfolio withdrawals.
For a couple with $40K combined Social Security, the effective need from portfolio is much smaller. The "safe withdrawal rate" is less relevant when Social Security covers 40-60% of retirement expenses.
Run your actual numbers: target spending - guaranteed income (Social Security, pensions) = portfolio withdrawal need. Apply 4% rule only to the portfolio need, not total spending.
The Medicare and Healthcare Wild Card
The 4% rule assumes stable expense trajectories. Healthcare expenses tend to grow faster than general inflation — 5-7% annually vs. 3% general.
Late-retirement years often see healthcare costs double or triple. This "spending bathtub" (high early retirement spending on travel, low middle years, high late years on healthcare) argues for maintaining withdrawal flexibility.
Fidelity estimates retirees need $165K in additional savings specifically for out-of-pocket healthcare. Build this into planning beyond the basic 4% math.
The Bond Yield Benefit
One positive development: bond yields around 4-5% mean Treasury ladders and muni bond portfolios can generate meaningful income for retirees without relying solely on stock appreciation.
A $500K bond allocation at 4.5% yield = $22.5K annual income. Combined with $500K stock allocation withdrawing 3-4%, total portfolio income of $40-42K without touching principal. This is a better position than 2015-2021's zero-rate environment.
The Practical Answer
The 4% rule remains approximately correct for:
- Standard retirement ages (62-70)
- 30-year planning horizons
- 60-70% stock allocations
- Diversified portfolios
- Willingness to adjust in truly bad markets
Adjustments for specific cases:
- Early retirement (before 60): use 3.3-3.5% initial rate
- Higher wealth ratio to spending: can use 4.5-5%
- Significant guaranteed income (Social Security, pension): 4% is conservative
- High healthcare concerns: leave more buffer
The Behavior Layer
The 4% rule succeeds when retirees:
- Don't panic-sell during drawdowns
- Maintain diversified allocation through retirement
- Accept some reduction in spending if portfolio performance is poor
- Stay invested in stocks despite sequence-of-returns fears
Most 4% rule failures aren't due to the math — they're due to behavioral failures. Retirees who lock in losses during crashes by moving to cash destroy the rule's assumptions. Those who stay invested usually succeed.
The 4% rule is a mathematical framework. Its success depends on behavioral discipline. For disciplined retirees with reasonable portfolios, it's still the right starting point. For those who can't resist the urge to "protect" capital during market drops, no withdrawal rate is truly safe.