You’ve probably come across the 4% rule. It’s one of the most quoted “rules of thumb” in retirement planning. The idea is simple: you withdraw 4% of your retirement pot in the first year, then increase that amount with inflation each year after. In theory, your portfolio should last at least 30 years.
It sounds tidy and reassuring. But does it still work?
The rule came from a piece of research in the 1990s by US financial planner William Bengen. The 4% rule is a popular retirement strategy—but does it still work today? We explore its origins, limitations, and why flexible planning is key to financial wellness. He looked at historical data and found that if you had a portfolio split roughly 60/40 between stocks and bonds, a 4% withdrawal rate would have survived even some of the worst market conditions.
It became popular because it gave people a number—something to work with. But here’s the thing: it was based on US data, past interest rates, and a fairly rigid view of retirement spending. And life today doesn’t work in such straight lines.
On paper, 4% looks safe. In practice, it depends on your situation. There are a few issues:
Markets don’t behave. A market crash early in retirement can seriously damage your portfolio.
People are living longer. A strategy designed for 30 years might fall short.
Spending isn’t linear. Some years you spend more (healthcare, helping family), some years less.
Bond yields today are low. The original analysis was based on higher fixed income returns than we see now.
So while 4% might still work in some scenarios, it doesn’t take much for it to stop working.
A more modern—and frankly, more realistic—approach is to be flexible.
Spend less when markets are down. Spend more when they’re doing well.
Consider guardrails (like the Guyton-Klinger method) to set upper and lower limits for spending.
Use a bucket strategy, holding some cash to avoid selling investments during downturns.
Think in terms of your life, not the rule. You may have other income sources—state pension, rental income, even part-time work.
Rules of thumb are a helpful starting point, but they can give a false sense of security. True financial wellness comes from understanding your own picture: your needs, your values, and how you want to live in retirement.
Some clients come in expecting a single number—the “safe withdrawal rate.” But the reality is, retirement isn’t a maths problem. It’s a lifestyle strategy. That’s where real planning begins.
The Wealth Coach, an independent financial advisory firm based in the UK. Nic Round, Chartered Wealth Manager.
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