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A safe withdrawal rate is the share of your retirement portfolio you withdraw in the first year of retirement, used as a starting point for estimating portfolio income. The familiar 4% rule means taking 4% of the portfolio’s starting value in year one and, in the classic version, increasing that dollar withdrawal with inflation in later years. It does not mean taking 4% of the balance anew every year, and it does not guarantee that your savings will last.
For example, 4% of $500,000 is $20,000 in the first year, or about $1,667 per month before taxes. That is a rough portfolio-withdrawal estimate—not a complete monthly retirement-income figure or a personalized recommendation. Social Security, pensions, taxes, spending needs, and the possibility of changing withdrawals all affect what a household can actually spend.
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What a safe withdrawal rate measures
A withdrawal rate expresses an initial portfolio withdrawal as a percentage of the portfolio at the beginning of retirement. A 4% starting rate applied to a $500,000 portfolio produces a first-year withdrawal of $20,000. Dividing by 12 gives a monthly equivalent of approximately $1,667.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsThe percentage is only the starting point. A rate is meaningful only alongside the assumptions that define how it will be used: the retirement horizon, the pattern of later withdrawals, the portfolio’s investments, market and inflation assumptions, and what counts as success. A rate calculated for one set of assumptions should not be treated as a universal answer for another retiree.
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“Safe” is shorthand for a modeled chance of sustaining withdrawals under specified conditions. It does not mean risk-free, certain, or guaranteed. Even when a model assigns a high probability of having money left at the end of a period, that probability is an estimate—not a promise about an individual portfolio’s future.
How the 4% rule turns into monthly portfolio income
Calculate the first-year withdrawal
- Choose a starting portfolio value. Use the amount you are treating as retirement savings available for withdrawals, rather than adding Social Security or pension income to that figure.
- Multiply it by the initial rate. For a 4% illustration, multiply the portfolio by 0.04. A $500,000 portfolio produces $20,000 for the first year.
- Divide the annual amount by 12. The $20,000 example is equivalent to about $1,667 per month before taxes.
This monthly figure is an arithmetic conversion of an annual withdrawal. It does not establish that a retiree should withdraw that amount each month, that it will be adequate, or that the same amount will remain sustainable under every market outcome.
Understand the inflation adjustment
In the classic 4% rule, the first withdrawal is based on the portfolio’s starting value. Later withdrawals generally adjust the original dollar amount for inflation. The calculation does not reset to 4% of the portfolio’s new balance every year. That distinction matters: an inflation-adjusted dollar withdrawal aims for a more consistent spending amount, while a withdrawal based on a percentage of the current balance changes as the portfolio rises or falls.
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If the portfolio performs poorly, continuing the inflation-adjusted dollar amount can require taking a larger share of the remaining balance. If markets do well, the withdrawal may become a smaller share. A fixed-dollar approach can make income more predictable, but it leaves the portfolio exposed to the consequences of continuing withdrawals through unfavorable periods.
What the latest Morningstar estimate says—and what it does not
Morningstar’s The State of Retirement Income: 2025, published December 3, 2025, reports a highest starting rate of 3.9% for retirees seeking consistent inflation-adjusted spending over an assumed 30-year retirement, with a 90% probability of having funds remaining at the end. The analysis uses forward-looking asset-class return and inflation assumptions and excludes Social Security and other nonportfolio income. It is a model result for that scenario, not a universal rate or guarantee.
For context, Morningstar’s 2024 report had a 3.7% base-case starting rate for a new retiree under a 30-year horizon and 90% success probability. The 2025 report’s 3.9% estimate is tied to that newer report’s assumptions; the change does not establish that every retiree can safely take more. Differences in market assumptions and plan design matter when interpreting rates across reports.
| Figure | What it represents | Important qualification |
|---|---|---|
| 3.9% | Morningstar’s 2025 highest starting rate for consistent inflation-adjusted withdrawals | Assumes 30 years and a 90% probability of funds remaining; excludes Social Security and other nonportfolio income. |
| 3.7% | Morningstar’s 2024 base-case starting rate for a new retiree | Also based on a 30-year horizon and a 90% success probability. |
| 5.7% | Highest starting rate reached by two flexible-spending methods tested in Morningstar’s 2025 report | Those methods require retirees to tolerate spending variation; this is not a like-for-like fixed-spending promise. |
In its 2025 forward-looking base-case analysis, the highest starting rate was associated with portfolios holding 30%–50% equities, with the balance in bonds and cash. That finding describes the allocation range associated with the report’s modeled result. It is not a direction to use that allocation regardless of a person’s time horizon, risk tolerance, or other income.
Why the rate changes with the plan
Retirement horizon
A withdrawal plan must cover the period for which money is needed. Morningstar’s cited 3.9% figure assumes 30 years; it does not answer what rate is appropriate for a shorter or longer retirement. A longer period means withdrawals may need to continue through more market and inflation conditions, so a 30-year estimate should not be silently applied to a different horizon.
Spending pattern and flexibility
A plan that aims to keep inflation-adjusted dollar withdrawals steady is different from one that allows spending to move with portfolio value or market results. Morningstar’s tested flexible methods reached higher modeled starting rates, up to 5.7%, but the trade-off is that withdrawals and spending can vary. A higher initial number is less useful if the retiree cannot reduce discretionary spending when the rules call for it.
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Investment mix and volatility
The portfolio’s allocation affects the modeled balance between growth potential and volatility. Morningstar’s 2025 report associated its highest forward-looking base-case rate with a 30%–50% equity allocation and the rest in bonds and cash. The report also notes that equity-heavy portfolios generally carry more volatility and sequence-of-returns risk in its forward-looking analysis. Allocation is therefore part of a withdrawal-rate estimate, not a separate detail that can be ignored after choosing a percentage.
Definition of success
A modeled “success” rate depends on what the model counts as success. In Morningstar’s 2025 figure, the stated outcome is a 90% probability of having funds remaining at the end of an assumed 30-year period. That is not the same as guaranteeing that the original balance remains intact, guaranteeing a specific inheritance, or proving that spending will never need to change.
Income outside the portfolio
A portfolio withdrawal rate estimates only portfolio withdrawals. Social Security, a pension, or other nonportfolio income can contribute to household income, but those sources are not included in Morningstar’s cited withdrawal-rate estimate. Compare the portfolio figure with the household’s full income and spending plan rather than reading it as the monthly amount available from every source combined.
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Historical results are not forecasts
Morningstar’s historical analysis examined a 50/50 stock/fixed-income portfolio across rolling 30-year periods that began between 1927 and mid-1995. The estimated starting rate ranged from 3.9% in the worst period to 10.5% in the best. That wide spread shows how much the result can depend on the sequence of conditions a retiree experiences.
The historical range is evidence of variation across those past periods, not a prediction that a future retiree will receive a rate near the best result. A backtest asks how a strategy would have fared through historical returns; Morningstar’s 2025 forward-looking estimate instead uses assumptions about future asset-class returns and inflation. Neither method removes uncertainty, and a result from one method should not be presented as though it were the other.
What can put a withdrawal plan under pressure
- Poor returns early in retirement: Withdrawals made while a portfolio is falling can leave fewer assets available for a later recovery. The timing of returns matters when money is being taken out.
- High inflation early in retirement: When withdrawals rise to maintain purchasing power, early inflation can increase the dollar amounts taken from the portfolio.
- A longer withdrawal period: A plan may need to support spending beyond the horizon used in the rate estimate.
- High long-term-care costs late in life: A substantial late-life expense can change the spending the portfolio must support.
- Limited ability to cut spending: Some modeled approaches depend on reducing or varying withdrawals after poor results. They may not fit a household whose spending is largely essential and difficult to change.
Morningstar identifies these conditions as factors that can reduce modeled plan success unless spending is reduced in response. The practical implication is not that every retiree should use the same adjustment, but that spending flexibility is part of the strategy being evaluated.
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- Set a planning horizon. Estimate how long withdrawals may need to continue. Do not assume a 30-year estimate applies if your plan uses another period.
- Separate portfolio withdrawals from other income. List portfolio withdrawals apart from Social Security, pensions, and other income so the withdrawal-rate calculation is not mistaken for total household income.
- Choose the withdrawal pattern you can live with. Decide whether you need more consistent inflation-adjusted dollars or can accept spending changes in response to portfolio results.
- Match the modeled rate to its assumptions. Check the horizon, allocation, spending rule, and success definition behind any published percentage before using it as a planning input.
- Compare the estimate with actual spending needs. A monthly equivalent is not a spending plan by itself. Account for taxes and the household’s budget when judging how much income is available to spend.
- Consider what changes after a difficult period. If returns or inflation make the plan harder to sustain, identify whether discretionary withdrawals can be reduced rather than assuming the initial monthly amount will always remain unchanged.
This process turns a rate into a question that is more useful than “Is 4% safe?”: what withdrawal pattern, over what horizon, from what portfolio, with what other income and spending flexibility, fits the household’s needs?
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