What Is the 4% Rule for Retirement?
The 4% rule is the single most useful shortcut in retirement planning. In one sentence: you can withdraw 4% of your starting portfolio in your first year of retirement, increase that dollar amount with inflation every year after, and have a high historical probability of not running out of money over a 30-year retirement. It is a rule of thumb, not a law — but it turns a vague worry ("will I have enough?") into a concrete number you can plan around.
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Step-by-step
- 1
Understand what the 4% actually refers to
The 4% is your first-year withdrawal as a percentage of your portfolio value on day one of retirement. If you retire with $1,000,000, your first-year withdrawal is $40,000. Crucially, you do not re-calculate 4% of the balance every year — you take that first dollar figure and bump it up with inflation annually, regardless of what the market does. That fixed-real-spending design is what the historical testing was based on.
- 2
Flip it around to get your retirement number
Because 4% is 1/25, the inverse of the rule is the "25× rule": multiply your desired annual retirement spending by 25 to get the portfolio you need. Want $60,000/year from your investments? You need roughly $1,500,000. Want $80,000/year? About $2,000,000. This is the fastest way to convert a spending target into a savings target, and it is exactly what our retirement and FIRE calculators do under the hood.
- 3
Subtract guaranteed income first
The 4% rule applies to the spending your portfolio must cover — not your total spending. Subtract Social Security, any pension, and annuity income first. If you spend $80,000/year but Social Security covers $30,000, your portfolio only needs to fund $50,000, which is a $1,250,000 target instead of $2,000,000. This single step is why people overestimate how much they need.
- 4
Know the assumptions you are inheriting
The rule was validated against a 30-year retirement, a balanced portfolio (roughly 50/50 to 60/40 stocks and bonds), US historical returns, and a retiree who sticks to the plan through downturns. Change any one of those — a 45-year retirement, an all-cash portfolio, or panic-selling in a crash — and the 4% success rate no longer applies.
- 5
Adjust down for long or early retirements
The 4% rule was built for a 30-year horizon. Retire in your 50s and you might need the money to last 40–45 years, which raises the risk of an unlucky run of early-retirement market returns. For those longer horizons, a more conservative 3.3%–3.5% withdrawal rate (about 28–30× spending) is the common adjustment. If you are weighing a specific early age, our retire-at pages walk through the trade-offs at 50, 55, and 60.
- 6
Treat it as a dashboard, not a thermostat
Real retirees do not withdraw on autopilot. They trim discretionary spending after bad years and loosen up after good ones. Variable-withdrawal approaches (such as Guyton-Klinger guardrails) let you start a bit higher than 4% while keeping the same long-run success odds. The 4% rule is best used to size your portfolio and sanity-check your plan, then revisited every year against reality.
💡 Tips
- Use the 4% rule to size the portfolio in gross (pre-tax) dollars. A $40,000 withdrawal from a traditional IRA is not $40,000 of spending money — after a 12–22% effective tax rate you keep $31,000–$35,000. Budget your actual lifestyle in after-tax terms.
- Keep one to three years of spending in cash or short-term bonds. The historical 4%-rule failures came from being forced to sell stocks during deep drawdowns; a cash buffer lets you ride those out and meaningfully improves the success rate.
- Run three scenarios with the withdrawal rate calculator: conservative (3.3%), base case (4%), and aggressive (4.5%). Plan your fixed expenses around the conservative number and let discretionary spending flex with the market.
FAQ
Is the 4% rule still safe in 2026?
For a standard 30-year retirement it remains broadly defensible, and most major researchers still cite a 3.7%–4.0% starting range. Some argue today's higher stock valuations justify the lower end of that band. For 40+ year early retirements, drop toward 3.3%. The rule is a strong starting point that should be monitored, not a guarantee.
How do I use the 4% rule to find my retirement number?
Multiply your annual portfolio-funded spending by 25. Subtract Social Security and pensions from your total spending first. For example, $70,000 of total spending minus $25,000 of Social Security leaves $45,000 to fund from investments — a $1,125,000 target.
Does the 4% rule account for inflation?
Yes. The design is that you take 4% in year one, then increase that dollar amount by inflation every subsequent year. That is why your portfolio needs to grow over time, not just hold its value — the withdrawals themselves rise with the cost of living.
What is the difference between the 4% rule and the 25× rule?
They are the same math from two directions. The 4% rule starts from a portfolio and tells you the safe withdrawal. The 25× rule starts from your spending and tells you the portfolio you need. 4% withdrawal equals a 25× target because 1 divided by 0.04 is 25.
Should early retirees use a lower withdrawal rate?
Generally yes. A retirement that starts at 50 may need to last 40–45 years, well beyond the 30-year window the 4% rule was tested for. Many early retirees use 3.3%–3.5% (28–30× spending) and stay flexible on spending in down markets.
Disclaimer. This guide is for general educational and informational purposes only and is not financial, tax, retirement, or investment advice. Projections are estimates based on the assumptions you provide; markets, tax law, and contribution limits change over time. Consult a licensed financial advisor or tax professional before making retirement decisions. Read our editorial policy.