The 4% rule is a historical guideline for setting an initial portfolio withdrawal. It is not a guarantee, and it is not a personal recommendation. This article covers how the rule works, the assumptions behind it, where it breaks down, whether it still holds up, and how to build a more flexible plan. For decisions about your own money, talk with a qualified professional.
Key Takeaways
- Withdraw 4% of the starting portfolio in year one, then adjust that dollar amount for inflation.
- The rule rests on historical data, a specific portfolio mix, and a roughly 30-year horizon.
- Sequence risk, taxes, fees, inflation, and longevity can all change the outcome.
- A flexible plan coordinated with other income often beats following 4% mechanically.
What Is the 4% Rule and How Does It Work?
The basic formula
You take 4% of your portfolio's value on the day you retire. That first-year dollar amount becomes your baseline. Each following year, you raise it by inflation. You do not recalculate 4% of whatever the portfolio is worth that year.
A hypothetical example
Say you retire with $1,000,000. Your first-year withdrawal is $40,000. If inflation runs 2.5%, Schwab's example shows the next withdrawal rises to $41,000, regardless of the new portfolio balance.
This is a gross figure. Taxes and investment fees come out of it, so your spendable income is lower.
Where the rule came from
William Bengen published "Determining Withdrawal Rates Using Historical Data" in the Journal of Financial Planning in 1994. He studied US returns from 1926 through 1992, using large-company stocks and intermediate-term Treasury bonds.
He found that 4% held up across roughly 30 years of every historical starting point, with stock allocations of about 50% to 75% working best.
The 1998 Trinity Study (Cooley, Hubbard and Walz) tested 1926-1995 data with stocks and high-grade corporate bonds. For 30-year periods at a 4% inflation-adjusted withdrawal, it found:
| Stock/bond mix | Historical success |
|---|---|
| 100/0 | 95% |
| 75/25 | 98% |
| 50/50 | 95% |
| 25/75 | 71% |
| 0/100 | 20% |
Success meant a positive ending balance. Overlapping historical periods are not independent forecasts.
Key assumptions
- A retirement of about 30 years
- A diversified stock-and-bond portfolio
- Annual inflation adjustments
- Historical US returns repeating closely enough
These are model inputs, not requirements.
What it does not measure
The rule estimates withdrawals from an investment portfolio. It does not calculate:
- Your total income need
- Taxes
- Healthcare or long-term care
- Social Security, pensions, or annuities
- A desired inheritance
What Are the Risks and Limitations of the 4% Rule?
Sequence-of-returns risk
Early losses hurt most because you are selling shares while prices are down. A Morningstar illustration used $1 million, a $40,000 start, and the same set of returns in two orders. Both averaged 5.89% annually.
High returns first left over $3 million by year 20. Low returns first ran out of money in year 26. The example is hypothetical, but the sequence risk is real.
Inflation and changing spending
Inflation hit 6.2% in 1973, 11.0% in 1974, and 13.5% in 1980 (annual averages, BLS). Retirees who started then watched purchasing power erode fast.
Spending also isn't uniform. David Blanchett's study of 591 retired households found real spending fell about 0.96% a year between ages 60 and 90. Still, healthcare, travel, or helping family can push costs up.
Longevity and health
Remaining life expectancy at 65 is about 18 years for men and 20.7 for women, per the Social Security Administration. But averages hide the tail: SSA says about 1 in 3 people at 65 may reach 90. A 30-year horizon can fall short for a healthy 60-year-old retiree.
Fidelity estimates $185,500 in healthcare costs for one 65-year-old retiring in 2026. That excludes long-term care.
Market and assumption risk
Future returns, interest rates, and inflation may not mirror the past. A portfolio far more conservative or aggressive than the model will produce different results, as the Trinity table shows.
Taxes, fees, and other income
- Traditional account withdrawals are generally taxed as ordinary income; qualified Roth withdrawals are not.
- Required minimum distributions generally begin at 73, rising to 75 for people born in 1960 or later.
- Fees matter: Morningstar's modeled 60/40 case with 1% annual expenses supported only a 3.4% start.
- Social Security, pensions, annuities, or part-time work should be built into the plan.
Is the 4% Rule Still Relevant Today?
What current research says
Published numbers differ because they answer different questions:
- Morningstar (December 2025): 3.9% for 30 years at 90% simulated success, with 35 years dropping it to 3.5%. Flexible methods reached up to 5.7%.
- Schwab: 4.2% to 4.8% for a 30-year moderate portfolio at 75% to 90% confidence, before taxes and fees.
- Bengen (2026): 4.7% after widening the asset mix, not the original two-asset result.
"Works" versus "doesn't work"
Both framings are too simple. The rule is a reasonable starting point and a poor promise. It fits least well for early retirees, long horizons, concentrated portfolios, or households that can't cut spending.
When a different rate may fit
A lower starting rate may suit a longer horizon, shaky markets, or a legacy goal. A higher one may suit someone with strong guaranteed income, a shorter horizon, or willingness to trim discretionary spending. No single percentage fits everyone.
Review the plan
Revisit withdrawals at least annually and after big market moves, inflation spikes, health events, income changes, or shifts in goals. A calculation from day one won't stay right forever.
How Can You Build a Personalized Withdrawal Strategy?
Start with the income gap
Map spending and the income that already covers it:
- Essential expenses: housing, food, insurance
- Discretionary expenses: travel, gifts
- Reliable income: Social Security, pensions, and similar sources
Subtract reliable income from total spending. The remainder is what your portfolio must fund. For context, SSA reports an average retired-worker benefit of about $2,089 a month, though yours will differ.
Use flexible withdrawals
Two common frameworks adjust spending as markets move:
- Guyton-Klinger guardrails cut spending 10% when your withdrawal rate drifts 20% above its start, and raise it 10% when it falls 20% below
- Vanguard's dynamic approach sets a floor and ceiling on yearly spending changes
The trade-off: you give up income stability to protect the portfolio.
Consider buckets
Christine Benz's framework splits assets by time horizon:
- Cash covers about two years of withdrawals
- High-quality bonds cover years 3 to 10
- Growth assets hold the remainder
It can ease anxiety in downturns, though Morningstar's comparison found it may lag through opportunity cost. It still needs rebalancing.
Coordinate taxes and account order
Drawing from taxable, traditional, and Roth accounts in different orders changes your tax bill and future RMDs. Fidelity contrasts sequential and proportional approaches for deciding which accounts to tap first. Work with a qualified tax professional on the sequence that fits your situation.
Get individualized guidance
Lewis & Associates Capital Advisors, LLC, a registered investment adviser in North Carolina, helps clients evaluate portfolio risk, withdrawal assumptions, income sources, and ongoing adjustments through personalized fiduciary retirement planning. The 4% rule isn't right for everyone, and no plan guarantees results.
Frequently Asked Questions
What is the 4% rule for retirement?
You withdraw 4% of your portfolio in year one, then raise that dollar amount with inflation each year. It comes from historical research and is a guideline, not a guarantee.
How long will my money last with the 4% rule?
The model is tied to roughly 30 years. Actual results depend on returns, inflation, taxes, fees, longevity, and portfolio mix.
What is a reasonable withdrawal rate from a retirement plan?
No universal rate exists. Consider your time horizon, spending needs, other income, risk tolerance, and flexibility.
What are some effective withdrawal strategies for retirement?
Options include fixed inflation-adjusted withdrawals, guardrails, buckets, and tax-aware account sequencing. Pair any of them with guaranteed income where it fits.
How do financial experts view the 4% rule?
Most treat it as a useful historical starting point. They differ on assumptions about markets, inflation, longevity, allocation, and how much spending can flex.
