How Much Do You Need to Retire? The 25x Rule and 4% Withdrawal Rate Explained

“How much do I need to retire?” is one of the most common questions in personal finance, and it has a surprisingly simple starting formula: the 25x rule.

The 25x Rule

Multiply your desired annual spending in retirement by 25, and you get a rough target portfolio size. This comes directly from the 4% withdrawal rate: if withdrawing 4% of your portfolio each year is considered sustainable, then your portfolio needs to be 25 times your annual spending (since 1 ÷ 0.04 = 25).

Worked Examples

Remember to subtract any guaranteed income first — CPP/Social Security, a pension, or rental income all reduce how much your portfolio actually needs to cover. If you need $70,000/year in retirement and expect $25,000/year from CPP and OAS combined, your portfolio only needs to fund the remaining $45,000/year — a target of $1,125,000, not $1,750,000.

Where the 4% Rule Comes From

The number traces back to the 1998 Trinity Study, which tested historical US market returns from 1926–1995 across rolling 30-year retirement periods. Researchers found that a 4% inflation-adjusted withdrawal rate, applied to a portfolio of roughly 50–75% stocks, survived the vast majority of historical 30-year windows without running out of money.

It is a rule of thumb, not a guarantee. Two retirees withdrawing the same 4% can have very different outcomes depending on the market returns in their specific first several years of retirement — a risk known as sequence-of-returns risk.

Why Sequence-of-Returns Risk Matters

A portfolio that loses 20% in year one of retirement, before any withdrawals even happen, is in a much weaker position than one that gains 20% in year one — even if both portfolios average the same return over 30 years. Withdrawing from a shrunken portfolio locks in losses that are difficult to recover from, since there is less capital left to benefit from the eventual rebound.

This is why many retirees keep 1–3 years of spending in cash or short-term bonds: it lets them avoid selling stocks at a loss during a market downturn in the critical early retirement years.

Adjusting the Rule for Your Situation

• Retiring early (before 60)? A 30+ year retirement horizon has historically supported success rates closer to a 3.25%–3.5% withdrawal rate rather than 4%, since the money needs to last longer.
• Have a paid-off home and low fixed costs? Flexible spenders who can cut back during down markets have historically been able to safely withdraw slightly more than the baseline 4%.
• Expecting a pension or pension-like income? Guaranteed income reduces how much of your spending needs to come from a volatile portfolio, which lowers your effective withdrawal risk.