The 4% rule is the most widely cited guideline for how much you can safely spend from a retirement portfolio. It is the reason our calculator estimates your monthly income by taking 4% of your projected balance. Here is what it really means and where it falls short.
What the rule says
In your first year of retirement, withdraw 4% of your total savings. Each following year, increase that dollar amount by inflation. Research on historical U.S. market returns suggested a portfolio managed this way had a strong chance of lasting about 30 years. So a $1,000,000 nest egg would support roughly $40,000 in the first year, or about $3,333 a month.
How to use it in reverse
Flip the rule around and it tells you how big a nest egg you need. Multiply the annual income you want from savings by 25. Want $40,000 a year? You need about $1,000,000. Want $60,000? Around $1,500,000. This “multiply by 25” shortcut is the fastest way to set a savings target — see how much you need to retire.
Important limitations
The 4% rule is a useful starting point, not a law. It came from specific historical data and assumptions that may not repeat. A few things it doesn’t capture:
- Market timing. Retiring just before a big downturn strains any withdrawal plan — a risk sometimes called sequence-of-returns risk.
- Longer retirements. If you retire early or live into your 90s, a lower rate such as 3–3.5% may be safer.
- Flexibility. Real retirees adjust spending in bad years, which can make higher rates workable.
- Other income. Social Security or a pension reduces how much you need from savings.
The takeaway
Use the 4% rule to size your goal and sanity-check your plan, then revisit it with a professional as you near retirement. Our calculator applies it so you can see, at a glance, roughly what your projected savings might pay you each month.