The 4% rule for retirement is a guideline for estimating how much you might withdraw from an investment portfolio in retirement. Under the classic version, you withdraw 4% of your portfolio in the first year. In later years, you adjust that original dollar amount for inflation rather than taking 4% of whatever the portfolio is currently worth.
For example, if you retire with $1 million invested, the rule suggests an initial withdrawal of $40,000. If inflation is 3% the next year, the following withdrawal would be $41,200. The calculation is a starting point for planning: it does not promise that your money will last or tell you exactly what you should spend. For an in-depth breakdown of stress-testing and failure conditions, see our analysis of when the 4% rule can fail and sequence risk.
How does the 4% rule work?
The rule estimates a first-year withdrawal from a diversified portfolio of stocks and bonds, then raises that withdrawal to keep pace with inflation. The familiar version aims to fund roughly 30 years of retirement, based on historical U.S. market returns.
A quick estimate is:
First-year portfolio withdrawal = retirement portfolio × 0.04
| Retirement portfolio | Approximate first-year withdrawal |
|---|---|
| $500,000 | $20,000 |
| $750,000 | $30,000 |
| $1,000,000 | $40,000 |
| $1,500,000 | $60,000 |
These figures are before taxes and investment fees. They also refer to withdrawals from investments, not total household income. Social Security, a pension, rental income, or part-time work may provide additional income. Our case studies on whether you can retire on $400,000 explore how guaranteed income bridges this baseline gap.
Why is it called the 4% rule?
Financial planner William Bengen’s 1994 research examined historical stock, bond, and inflation data to estimate withdrawal rates that could have sustained a portfolio through past 30-year retirement periods. His initial finding was about 4.15%, which became widely known as the “4% rule.” Bengen has emphasized that the result was a historical finding based on specific assumptions—not a universal instruction for every retiree. The 1998 Trinity Study helped bring the approach to wider attention.
Historical testing can show how a strategy would have behaved in past markets. It cannot guarantee that future returns, inflation, taxes, or personal circumstances will match the past.
How much do you need to retire under the 4% rule?
A common shortcut is to multiply the amount you expect to withdraw from investments each year by 25. That is the same as dividing the planned annual withdrawal by 4%.
Estimated portfolio target = annual portfolio withdrawals × 25
If you expect to need $40,000 a year from your investments, the 4% estimate points to a portfolio of about $1 million. If Social Security and a pension cover $30,000 of a $70,000 annual budget, the amount to be funded by investments is $40,000, before accounting for taxes and other details.
Use your expected portfolio-funded spending—not your entire household budget—for this estimate. Include healthcare, housing, taxes, fees, and irregular expenses when building a retirement budget.
Is the 4% rule still safe in 2026?
There is no withdrawal rate that is safe for everyone. Morningstar’s 2025 retirement-income research estimated a 3.9% starting rate for new retirees seeking inflation-adjusted spending over 30 years, with a modeled 90% probability of funds remaining at the end. Its estimate depends on assumptions about investment returns, asset allocation, inflation, and spending consistency. That figure is close to 4%, but it is not a guarantee or a personal recommendation.
The right starting rate may be lower if you retire early, expect a retirement longer than 30 years, have a concentrated or conservative portfolio, face high fees, or cannot reduce spending during downturns. A flexible withdrawal plan may allow different spending, but it also means income can vary from year to year. Retirees managing larger balances should review retiring with $5 million to see how capital preservation and dynamic spending interact.
The biggest limitation: early market losses
A portfolio can earn a reasonable average return over decades and still struggle if poor returns arrive early in retirement. This is called sequence-of-returns risk. If you keep withdrawing the same inflation-adjusted amount while investments fall, you sell more shares at depressed prices and leave fewer assets to recover when markets improve.
The classic rule also assumes a particular time horizon and investment mix. It does not automatically account for long-term care, large one-time expenses, changing tax rules, investment fees, or a desire to leave a specific inheritance. Location and tax climate also matter; see the best states to retire on a fixed income for geographic expense comparisons.
Ways to make a retirement withdrawal plan more resilient
- Build a detailed spending plan. Separate essential expenses from discretionary spending and include healthcare and taxes.
- Count guaranteed income. Estimate Social Security, pensions, and annuity income separately from portfolio withdrawals.
- Keep a diversified portfolio. The historical rule was not designed for an all-cash portfolio or a single stock.
- Set a review schedule. Revisit spending and investments at least annually and after major life or market changes.
- Consider flexible spending. If markets perform poorly, reducing optional spending may help preserve the portfolio.
- Plan for a longer retirement if needed. A 30-year estimate may not fit someone retiring in their 50s or early 60s.
Frequently asked questions
Does the 4% rule mean I withdraw 4% of my balance every year?
No. In the classic method, you calculate 4% of the starting portfolio in year one, then adjust that dollar amount for inflation. Taking 4% of the current balance each year is a different strategy; it makes withdrawals rise and fall with the portfolio.
Does the 4% rule include Social Security?
No. It is a guideline for withdrawals from an investment portfolio. Social Security or pension income can reduce how much you need to withdraw from investments.
Will my money definitely last 30 years if I use the 4% rule?
No. The rule is based on historical market testing and assumptions. Future returns, inflation, fees, taxes, and your lifespan can differ from the past.
Is the 4% rule a law or a government retirement benefit?
No. It is a personal-finance rule of thumb. It is not a U.S. pension law, a Social Security benefit, or a guarantee from the government.
Bottom line: The 4% rule can help translate a portfolio balance into a rough first-year withdrawal estimate. Treat it as a planning benchmark, then adapt it to your retirement date, income sources, spending needs, taxes, and ability to adjust when markets change.
FaQ
Does the 4% rule mean I withdraw 4% of my balance every year?
No. In the classic method, you calculate 4% of the starting portfolio in year one, then adjust that dollar amount for inflation. Taking 4% of the current balance each year is a different strategy; it makes withdrawals rise and fall with the portfolio.
Does the 4% rule include Social Security?
No. It is a guideline for withdrawals from an investment portfolio. Social Security or pension income can reduce how much you need to withdraw from investments.
Will my money definitely last 30 years if I use the 4% rule?
No. The rule is based on historical market testing and assumptions. Future returns, inflation, fees, taxes, and your lifespan can differ from the past.
Is the 4% rule a law or a government retirement benefit?
No. It is a personal-finance rule of thumb. It is not a U.S. pension law, a Social Security benefit, or a guarantee from the government.
