How Much Do You Need to Retire? The 4% Rule and Beyond
How much is enough to retire? It feels unknowable, but a simple framework gets you surprisingly close. The answer depends mostly on how much you spend, not how much you earn — because retirement is funded by replacing your spending, year after year, without a salary.
The 4% rule
A widely cited guideline says you can withdraw about 4% of your portfolio in your first year of retirement, then adjust for inflation, with a strong chance of the money lasting 30 years. Flip that around and it gives a target: multiply your annual spending by 25. If you need 40,000 a year from your investments, you would aim for a portfolio of about 1,000,000.
What the rule gets right and wrong
- Right: it ties your target to spending, and gives a concrete, motivating number.
- Limited: it is based on historical US data and a 30-year horizon — early retirees may want a more conservative 3 to 3.5%.
- Incomplete: it ignores pensions, Social Security and other income, which reduce how much your portfolio must cover.
Building toward your number
- Estimate your annual spending in retirement, not your income.
- Subtract expected income like Social Security or a pension to find what your portfolio must supply.
- Multiply that gap by 25 (or up to about 30 to be cautious) for your target.
- Invest regularly and let compounding close the distance over the years.
Does Social Security change my number?
Yes, significantly. Any guaranteed income reduces how much your portfolio needs to provide, lowering your target. Estimate your benefit and subtract it from your spending before applying the multiple.
Is the 4% rule guaranteed?
No. It is a historically-informed guideline, not a promise. Market sequence, inflation and how long you live all matter. Treat it as a planning anchor and stay flexible with spending, especially in early retirement.
The bottom line
Estimate your retirement spending, subtract other income, and multiply the rest by about 25 for a target — that is the 4% rule in a sentence. It is a guideline, not a guarantee, so build in a margin and invest steadily toward it. Run your own projection with our free retirement calculator.