The 4% rule is a retirement-spending guideline: withdraw 4% of the initial investment portfolio in the first year, then adjust that dollar amount for inflation in later years. It is not a guaranteed investment return and does not automatically fit every retirement. For a comprehensive overview of initial calculations and Morningstar 2026 data, start with our guide on what is the 4% rule for retirement.
The idea is associated with William Bengen’s historical withdrawal research, published in 1994. Historical tests help explain how a strategy behaved in the periods examined; they cannot guarantee future results. Bengen’s original research.
How the calculation works
| Starting portfolio | First-year withdrawal at 4% | Monthly equivalent |
|---|---|---|
| $400,000 | $16,000 | About $1,333 |
| $750,000 | $30,000 | $2,500 |
| $1,000,000 | $40,000 | About $3,333 |
| $2,000,000 | $80,000 | About $6,667 |
| $5,000,000 | $200,000 | About $16,667 |
These are gross withdrawals, not after-tax income estimates. Your account mix affects the amount available for spending.
For a $1 million portfolio, a hypothetical 3% inflation adjustment would increase the second-year withdrawal from $40,000 to $41,200. Another 3% adjustment would make the third-year amount $42,436.
The basic method adjusts the original dollar withdrawal. It does not recalculate 4% of the latest portfolio balance each year. That second method is a different strategy, with a different spending pattern. Schwab’s withdrawal-rule explanation.
The related “25 times expenses” shortcut
Dividing by 4% is the same as multiplying by 25. If the portfolio must supply $30,000 in the first year, the shortcut points to $750,000.
Use the portfolio-funded gap, not automatically all household spending. If annual outflow is $60,000 and dependable nonportfolio income is $30,000, the gap is $30,000. The shortcut gives $750,000, subject to the strategy’s limitations.
If income does not start immediately, the bridge years need separate funding. A person retiring before Social Security begins cannot simply subtract a future benefit from today’s budget.
The worked examples in retiring on $400,000 show how much that distinction can change the answer.
Why the rule can fail: poor early returns
Withdrawals make the order of returns matter. Losses early in retirement can force you to spend a greater share of the remaining portfolio before a recovery.
Consider two hypothetical paths. Both start with $100,000, withdraw $4,000 at the beginning of each year, and have one year at −20% and one at +25%. Ignore taxes, fees, and inflation for this illustration.
| Step | Loss first | Gain first |
|---|---|---|
| Initial balance | $100,000 | $100,000 |
| After first $4,000 withdrawal | $96,000 | $96,000 |
| After first year’s return | $76,800 | $120,000 |
| After second $4,000 withdrawal | $72,800 | $116,000 |
| After second year’s return | $91,000 | $92,800 |
Without withdrawals, the two returns would produce the same ending value: a 20% decline followed by a 25% increase returns to the starting point. With the stated withdrawals, the ending balances differ. This is an original arithmetic illustration of sequence risk, not a historical backtest.
A longer retirement changes the problem
A spending rule assessed over a limited horizon cannot automatically validate a retirement that might last 40 or 50 years. Early retirees need to test the longer period, healthcare before Medicare, and future changes in dependable income.
Similarly, a household planning for one person’s life expectancy should consider the possibility that either partner lives substantially longer. A long planning horizon is a scenario to examine, not a prediction of an individual’s lifespan.
In a larger portfolio, the dollar margin can feel reassuring while the same structural risk remains. See retiring with $5 million for the role of spending flexibility and estate goals.
Inflation can increase the burden after a market decline
Suppose a hypothetical retiree starts with $1 million and withdraws $40,000. If the account balance before the next withdrawal is $800,000 and the inflation adjustment calls for $42,000, that withdrawal is 5.25% of the remaining balance.
Nothing in the label “4% rule” prevents this. The name refers to the initial rate, not a permanent ceiling on withdrawals as a percentage of current assets.
Inflation also affects households unevenly. Someone facing higher care costs, rent, or insurance may experience a spending increase different from a broad price index.
Fees, taxes, and one-time costs matter
The portfolio pays for more than the spending you see in a checking account. Investment expenses and advice fees can reduce the amount remaining, while taxes can increase the gross withdrawal needed for a net spending goal.
For illustration, an assumed 1% annual fee on $1 million is $10,000. If it is charged to the portfolio in addition to a $40,000 withdrawal, the initial outflow is larger than the withdrawal alone. Actual fee arrangements and balances differ; avoid counting an expense twice if a projection already includes it.
A roof replacement, family gift, or relocation can also sit outside a routine annual budget. Either fund the expense separately or show how it changes the withdrawal path.
What can you use instead of a rigid rule?
Compare several policies using the same portfolio and spending assumptions:
| Approach | How it works | Tradeoff to examine |
|---|---|---|
| Fixed inflation-adjusted withdrawals | Start with a dollar amount and adjust for inflation | Stable intended purchasing power, potentially greater stress after losses |
| Percentage of current assets | Recalculate spending from the current balance | Spending falls when the portfolio falls |
| Guardrails | Change withdrawals when predefined thresholds are crossed | Requires willingness and capacity to adjust spending |
| Essential-expense planning | Identify dependable income for core bills, then plan discretionary withdrawals | Available income may not fully cover essentials |
These are options to model, not a ranked list of universally superior methods. A flexible plan only works if the household can actually reduce the spending designated as flexible.
Build the budget before selecting the percentage
Classify essential bills, discretionary spending, and irregular commitments. Estimate taxes and identify when other income begins. Then test the withdrawal policy against poor returns, higher expenses, and a longer retirement.
Lower recurring expenses can improve the result without requiring stronger market performance. If housing is the biggest variable, compare states for retirement on a fixed income and the Florida, Texas, and Tennessee budget examples.
The useful outcome is a spending policy you understand: what you plan to withdraw, what would make you change it, and which expenses can respond.
Frequently asked questions
Is the 4% rule a guaranteed return?
No. It is a withdrawal guideline. A portfolio can lose value even while the retiree follows the rule.
Do I take 4% of my current balance every year?
Not under the usual inflation-adjusted version. That starts from the original portfolio and adjusts the dollar withdrawal. A current-balance percentage is a separate approach.
Does the rule include Social Security?
Social Security is a separate income source. Account for it when determining the spending gap the portfolio must cover, including the date benefits start.
Can I use it for a 40-year retirement?
Use it as a starting question, not validation. Test the longer horizon, investment assumptions, taxes, costs, and your ability to change spending.
FaQ
How does the 4% rule work in retirement?
The 4% rule is a spending guideline where you withdraw 4% of the initial investment portfolio in the first year, and then adjust that dollar amount for inflation in later years.
Do I withdraw 4% of my original portfolio or my current balance each year?
Under the basic inflation-adjusted method, you base the withdrawal on the original portfolio amount and adjust the dollar figure for inflation. Recalculating spending based on a percentage of the current balance is a different strategy.
Does the 4% rule include taxes, investment fees, and Social Security?
The rule calculates gross withdrawals, meaning taxes and investment fees reduce the actual amount available in your checking account. Social Security is a separate income source that should be accounted for when determining the initial spending gap the portfolio must cover.
How does inflation change withdrawals under the 4% rule?
Inflation increases the dollar amount withdrawn each year. If the portfolio balance drops due to market declines, the inflation-adjusted withdrawal becomes a larger percentage of the remaining balance.
Can the 4% rule work for a retirement lasting 40 years or longer?
A spending rule assessed over a limited horizon cannot automatically validate a 40- or 50-year retirement. Early retirees must stress-test the longer period, healthcare costs prior to Medicare, and future changes in dependable income.
How can poor investment returns early in retirement affect the 4% rule?
Poor returns early in retirement create sequence risk, forcing you to spend a greater share of your remaining portfolio before a market recovery. This can result in a permanently lower ending balance compared to experiencing the exact same returns in a different order.
What alternatives can I consider if a fixed inflation-adjusted withdrawal is too risky?
Recalculate spending as a percentage of current assets, which lowers spending when the portfolio falls; use guardrails to change withdrawals when predefined thresholds are crossed; or use essential-expense planning to cover core bills with dependable income while keeping discretionary withdrawals flexible.
