The 4% Rule Explained

Understanding One of the Most Discussed Retirement-Income Strategies

Anyone who has researched retirement planning has probably encountered the “4% Rule.” It is one of the best-known guidelines for estimating how much a retiree might withdraw from an investment portfolio.

The rule is useful because it turns a complicated retirement question into a simple starting point. Unfortunately, retirement rarely agrees to remain simple.

The 4% Rule is not a guarantee, a law, or a personalized recommendation. Every retiree has different spending needs, income sources, investment portfolios, tax circumstances, health considerations, and long-term goals.

Understanding how the rule works—and where it may fall short—can help you make more informed retirement-planning decisions.

What Is the 4% Rule?

The traditional 4% Rule suggests withdrawing approximately 4% of an investment portfolio during the first year of retirement and then adjusting that dollar amount for inflation in future years.[1]

For example, someone beginning retirement with a $1 million portfolio might withdraw:

• First year: $40,000

• Second year: $41,200, assuming 3% inflation

• Third year: The previous year’s withdrawal adjusted again for inflation

The rule does not traditionally mean withdrawing exactly 4% of the portfolio’s current value every year. After the first year, withdrawals are generally based on the prior year’s dollar amount and an inflation adjustment—not a new calculation using the current portfolio balance.[1]

That distinction matters. Under the traditional approach, withdrawals may continue increasing with inflation even after the portfolio declines.

Where Did the 4% Rule Come From?

The guideline is commonly associated with financial planner William Bengen’s 1994 research, Determining Withdrawal Rates Using Historical Data.

Bengen evaluated how different inflation-adjusted withdrawals would have affected hypothetical stock-and-bond portfolios during numerous historical retirement periods. His analysis concluded that an initial withdrawal rate of approximately 4% was generally appropriate for a hypothetical 60- to 65-year-old retiree seeking a lengthy portfolio life under the assumptions tested.[1]

Later research by Philip Cooley, Carl Hubbard, and Daniel Walz—commonly known as the “Trinity Study”—tested several withdrawal rates, portfolio allocations, and retirement periods using historical returns from 1926 through 1995.[2]

The Trinity Study evaluated:

• Initial withdrawal rates ranging from 3% to 12%

• Retirement periods of 15, 20, 25, and 30 years

• Portfolios containing different combinations of stocks and bonds

• Both fixed and inflation-adjusted withdrawals

These studies helped establish 4% as a widely discussed retirement-planning benchmark. However, neither study promised that 4% would work for every future retiree.

What Was the Research Trying to Measure?

The historical research examined whether a hypothetical portfolio could support withdrawals throughout a specified retirement period without being completely depleted.

In the Trinity Study, a scenario was classified as successful when the portfolio had a value greater than zero at the end of the selected period.[2]

That definition is important.

A “successful” historical result did not necessarily mean that the retiree:

• Maintained a comfortable financial cushion

• Left money to beneficiaries

• Avoided reducing spending

• Paid all taxes and investment expenses

• Experienced low portfolio volatility

• Felt financially secure throughout retirement

It simply meant that the hypothetical portfolio did not run out before the end of the tested period.

Why Isn’t the 4% Rule Right for Everyone?

Every retirement is different.

Factors that may affect an appropriate withdrawal strategy include:

• Retirement age

• Retirement length

• Health and life expectancy

• Investment allocation

• Market performance

• Inflation

• Investment expenses

• Taxes

• Healthcare and long-term-care costs

• Social Security benefits

• Pension income

• Spending flexibility

• Desired inheritance

• Unexpected family expenses

The Department of Labor encourages individuals to consider a retirement period of approximately 30 years because actual longevity can exceed average life expectancy.[3] Someone retiring unusually early or wanting to plan beyond 30 years may need a different starting withdrawal rate.

Someone retiring later, receiving substantial guaranteed income, or willing to adjust spending during difficult markets may have different options.

Historical Results Do Not Predict the Future

The original 4% research relied on historical U.S. stock, bond, and inflation data.

Historical analysis can help illustrate what happened during past market environments, including periods involving:

• Severe stock-market declines

• High inflation

• Recessions

• Strong economic growth

• Falling or rising interest rates

However, future market returns, inflation, taxes, and retirement expenses may differ substantially from the periods included in those studies.

The Trinity Study also did not account for taxes or transaction costs, meaning an investor’s actual experience could differ from the historical results.[2]

The 4% Rule should therefore be viewed as a planning framework—not a prediction of what a portfolio will accomplish.

Sequence-of-Returns Risk

One of the most important limitations of any fixed withdrawal strategy is sequence-of-returns risk.

This is the risk that poor investment returns occur early in retirement while the retiree is also withdrawing money.

Consider two retirees who experience the same average return over 30 years:

• One experiences strong returns early and losses later.

• The other experiences losses early and strong returns later.

Even though their average returns may be identical, the retiree experiencing early losses may have a much worse outcome. Selling investments during a downturn leaves fewer assets available to participate in a later recovery.

The original withdrawal-rate studies emphasized that average returns alone can be misleading because the order of annual gains and losses can materially affect how long a portfolio lasts.[1][2]

Inflation Can Create Additional Pressure

Inflation reduces purchasing power.

A withdrawal that comfortably covers expenses at the beginning of retirement may be insufficient 15 or 20 years later. The traditional 4% approach attempts to address this by increasing the withdrawal amount with inflation.

However, high inflation can create two challenges simultaneously:

1. The retiree may need to withdraw more money to maintain the same lifestyle.

2. Financial markets may not generate enough growth to offset the larger withdrawals.

FINRA notes that retirees may be especially vulnerable to inflation because they may rely heavily on fixed or limited income sources and have less time to recover from market losses.[4]

Taxes Matter

The 4% Rule generally describes a gross portfolio withdrawal, not the amount the retiree will necessarily have available to spend after taxes.

For example, a $40,000 withdrawal may produce different tax consequences depending on whether it comes from:

• A Traditional IRA

• A Roth IRA

• A 401(k)

• A taxable brokerage account

• A combination of accounts

Traditional IRA withdrawals attributable to deductible contributions and earnings are generally taxable, while qualified Roth IRA distributions are generally federal income-tax-free.[5]

Withdrawal decisions may also affect:

• The taxation of Social Security benefits

• Medicare income-related premium adjustments

• Capital-gains taxes

• Required minimum distributions

• Eligibility for deductions or credits

• State income taxes

A withdrawal strategy should therefore consider both the amount removed from the portfolio and the amount available after taxes.

Investment Allocation Matters

The historical research behind the 4% Rule generally assumed a diversified portfolio containing both stocks and bonds.

That does not mean the rule can automatically be applied to:

• A portfolio held entirely in cash

• A highly concentrated stock portfolio

• A portfolio dominated by one industry

• A speculative investment strategy

• A leveraged portfolio

• A portfolio with unusually high expenses

Different investments involve different levels of market, inflation, credit, liquidity, and concentration risk.

FINRA recommends that retirees consider asset allocation, diversification, investment risk, inflation, income needs, taxes, and other income sources when managing retirement assets.[4][6]

Diversification and asset allocation may help manage risk, but they cannot guarantee that a portfolio will avoid losses or last for a particular period.

Spending Rarely Follows a Perfectly Straight Line

The traditional 4% Rule assumes that spending increases consistently with inflation.

Real life is usually less cooperative.

Retirement spending may change because of:

• Travel during the early retirement years

• Paying off a mortgage

• Helping children or grandchildren

• Home repairs

• Healthcare expenses

• Long-term-care needs

• Reduced activity later in retirement

• The death of a spouse

• Changes in taxes or insurance costs

Some expenses may decline, while others may increase dramatically.

A retirement-income plan based on actual expected expenses may provide more useful information than assuming every category of spending will rise at the same rate each year.

The Importance of Flexibility

A fixed inflation-adjusted withdrawal can provide predictable income, but flexibility may improve a retiree’s ability to respond to changing conditions.

Potential adjustments might include:

• Reducing discretionary spending after market declines

• Delaying a major purchase

• Taking a smaller inflation increase

• Using cash reserves during a downturn

• Rebalancing the investment portfolio

• Coordinating withdrawals among different account types

• Adjusting spending after especially strong market years

• Revisiting Social Security or pension decisions

FINRA recommends disciplined spending and notes that retirees may need to reduce optional expenses when their portfolios experience losses.[6]

Flexibility does not eliminate risk, but it may prevent a temporary setback from becoming a permanent problem.

Retirement Income Is More Than Portfolio Withdrawals

A comprehensive retirement-income strategy considers more than money withdrawn from investments.

Other income sources may include:

• Social Security benefits

• Employer pensions

• Annuity income

• Cash savings

• Rental income

• Part-time employment

• Business income

• Other guaranteed or recurring income

Suppose a household needs $100,000 per year but receives $55,000 from Social Security and a pension. The investment portfolio may need to provide only the remaining amount, adjusted for taxes and other considerations.

The 4% Rule focuses on portfolio withdrawals. It does not independently determine when Social Security should begin, which account should be used first, or how taxes should be managed.

Can You Withdraw More Than 4%?

Possibly.

A higher starting withdrawal rate may be more reasonable when someone:

• Has a shorter anticipated retirement

• Has significant guaranteed income

• Can reduce spending later

• Is comfortable accepting a greater risk of portfolio depletion

• Has spending needs that are temporarily higher

• Does not prioritize leaving an inheritance

However, higher withdrawals generally place greater pressure on the portfolio and increase the risk that savings will be depleted sooner. The original research found that higher withdrawal rates produced less favorable outcomes across many historical periods.[1][2]

The ability to withdraw more does not mean doing so is automatically advisable.

Can You Withdraw Less Than 4%?

Yes.

A lower withdrawal rate may be appropriate when someone:

• Retires early

• Wants to plan for an unusually long retirement

• Has limited spending flexibility

• Holds a more conservative portfolio

• Wants to preserve assets for beneficiaries

• Is concerned about future healthcare expenses

• Has little guaranteed retirement income

• Prefers a larger margin of safety

Withdrawing less may improve portfolio sustainability, but it can also cause retirees to unnecessarily restrict their lifestyle.

The goal is not always to withdraw as little as possible. The goal is to balance present enjoyment, future security, and legacy objectives.

Does the Rule Include Social Security?

No.

The traditional 4% calculation focuses on withdrawals from an investment portfolio. It does not directly incorporate Social Security, pensions, rental income, or employment earnings.

Those income sources should be included separately when determining how much the portfolio must provide.

For example, delaying Social Security may require larger portfolio withdrawals during the early years of retirement but could provide a higher monthly Social Security benefit later. Whether that tradeoff is beneficial depends on the retiree’s circumstances.

Does the Rule Include Required Minimum Distributions?

Not automatically.

Required minimum distributions, commonly called RMDs, are tax rules that may require distributions from certain retirement accounts. They do not determine how much a retiree should spend.

An RMD could be:

• Greater than the amount needed for living expenses

• Less than the amount needed

• Reinvested in a taxable account after taxes are paid

• Used for charitable or family goals when appropriate

A retirement-income plan should coordinate legal distribution requirements with actual spending and tax-planning needs.

Should the Withdrawal Strategy Change Over Time?

Usually.

A retirement plan should be reviewed regularly and after meaningful life changes.

Reviews may evaluate:

• Current portfolio value

• Recent withdrawals

• Investment performance

• Inflation

• Spending changes

• Tax-law developments

• Healthcare needs

• Social Security and pension income

• Changes in family circumstances

• Updated estate-planning goals

The appropriate withdrawal amount at age 65 may not remain appropriate at age 75 or 85.

Our Approach to Retirement Income

At Liberty Point Financial, we do not rely exclusively on a single percentage or formula.

Instead, we develop personalized retirement-income strategies based on factors such as:

• Financial goals

• Retirement timeline

• Expected expenses

• Investment portfolio

• Risk tolerance

• Tax considerations

• Social Security

• Pension income

• Healthcare needs

• Estate-planning objectives

• Other income sources

The 4% Rule may provide a useful starting point, but the final strategy should reflect the client’s complete financial circumstances.

Frequently Asked Questions

Is the 4% Rule a guarantee?

No.

It is a general guideline based on historical market research. It does not guarantee that a portfolio will last for 30 years or any other period.

Does the rule mean withdrawing 4% of my current balance every year?

Not under the traditional version.

The original approach generally begins with 4% of the portfolio’s initial value and then adjusts the dollar withdrawal for inflation. Withdrawing 4% of the current balance each year is a different strategy that produces variable income.

Can I withdraw more than 4%?

Possibly.

The appropriate amount depends on your retirement period, expenses, investment allocation, income sources, tax circumstances, flexibility, and tolerance for portfolio depletion.

Can I withdraw less than 4%?

Yes.

Some retirees choose a lower initial rate to accommodate early retirement, longevity concerns, legacy goals, limited spending flexibility, or greater uncertainty.

Does the 4% Rule account for investment fees?

Not fully.

The original Trinity Study did not deduct taxes or transaction costs. Investment-management fees, fund expenses, trading costs, and taxes can reduce the amount available to support retirement spending.[2]

What happens if the market falls during my first year of retirement?

The traditional rule would still call for adjusting the original withdrawal amount for inflation. However, following that formula without modification could place additional pressure on a declining portfolio.

A personalized strategy may include spending adjustments, cash reserves, rebalancing, or other measures. None of these approaches can eliminate investment risk.

Does the 4% Rule guarantee an inheritance?

No.

The research generally measured whether a portfolio remained above zero through a specified period. It did not guarantee a particular ending balance or inheritance.

Should I automatically increase my withdrawal every year?

Not necessarily.

The traditional rule includes annual inflation adjustments, but an individual strategy may use more flexible increases based on spending needs, portfolio performance, inflation, and other income.

Final Thoughts

The 4% Rule has helped many investors understand the relationship between retirement spending and portfolio sustainability.

Its greatest value may be as a starting point—not as a retirement autopilot button.

A successful retirement strategy should consider your goals, expected expenses, income sources, investments, taxes, longevity, healthcare needs, and willingness to adjust spending. It should also be reviewed as markets and personal circumstances change.

Retirement deserves more than one percentage and crossed fingers.

Ready to Build Your Retirement-Income Plan?

If you are preparing for retirement or reviewing your current withdrawal strategy, Liberty Point Financial can help you create a personalized retirement-income plan designed around your goals.

Schedule a complimentary consultation to get started.

Important Disclosure

This article is provided for educational and informational purposes only and should not be considered individualized investment, legal, tax, accounting, or retirement-income advice. References to the 4% Rule and historical withdrawal rates are provided for educational purposes and should not be interpreted as a recommendation, projection, or guarantee of future results.

Historical analyses are based on specific assumptions, asset allocations, time periods, market data, and withdrawal methods that may not reflect an individual investor’s circumstances or future market conditions. Taxes, fees, inflation, investment returns, and personal expenses may materially affect actual results.

Every individual’s financial circumstances are unique. Diversification and asset allocation do not ensure a profit or protect against loss. Advisory services are provided only pursuant to a written advisory agreement. Investing involves risk, including the possible loss of principal. Past performance does not guarantee future results.

Sources

1. William P. Bengen, “Determining Withdrawal Rates Using Historical Data,” Journal of Financial Planning. Original historical analysis of inflation-adjusted withdrawals, portfolio longevity, asset allocation, and the approximately 4% initial withdrawal guideline.

2. Philip L. Cooley, Carl M. Hubbard, and Daniel T. Walz, “Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable,” AAII Journal. Historical analysis commonly called the Trinity Study, evaluating withdrawal rates, stock-and-bond allocations, portfolio success rates, payout periods, and the limitations created by taxes and transaction costs.

3. U.S. Department of Labor, Employee Benefits Security Administration, “Taking the Mystery Out of Retirement Planning.” Retirement-planning guidance regarding longevity, inflation, projected expenses, retirement income, and planning for a potentially 30-year retirement.

4. FINRA, Regulatory Notice 07-43. Guidance addressing the importance of retirement age, life stage, income needs, liquidity, healthcare expenses, inflation risk, market risk, investment objectives, and financial circumstances.

5. Internal Revenue Service, “Traditional and Roth IRAs.” Federal tax guidance concerning the treatment of Traditional IRA and Roth IRA withdrawals.

6. FINRA, “Managing Your Retirement Portfolio.” Investor guidance regarding retirement withdrawals, asset allocation, diversification, inflation, taxes, spending discipline, portfolio losses, and the absence of a one-size-fits-all withdrawal rate.

Sources reviewed July 14, 2026.