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.