If you’ve spent any time reading about retirement, you’ve probably come across the 4% rule.

It’s one of the most well-known retirement guidelines, and for many people, it’s become the answer to a simple question:

“How much can I safely withdraw from my investments each year without running out of money?”

But while the 4% rule is a useful concept, it’s often misunderstood.

The reality is that it was never meant to be a one-size-fits-all retirement strategy.

What Is the 4% Rule?

The 4% rule originated from research by financial planner William Bengen in the 1990s.

His research suggested that someone with a diversified portfolio of stocks and bonds could withdraw 4% of their portfolio in the first year of retirement, increase that amount each year to account for inflation, and have a high probability of their savings lasting at least 30 years.

For example:

• A $1 million portfolio would provide $40,000 in the first year.
• The following year, that amount would increase based on inflation—not on how the portfolio performed.

The goal wasn’t to maximize wealth.

It was to reduce the risk of running out of money during retirement.

Why It Became So Popular

The appeal of the 4% rule is simple.

It gives people a framework.

Instead of wondering how much they can spend, they have a starting point that’s backed by research.

For many retirees, that’s reassuring.

But it’s important to remember that the original research was based on historical U.S. market data, a specific asset allocation, and a 30-year retirement horizon.

Not everyone’s retirement looks like that.

Where the Rule Starts to Break Down

Retirement today is more complex than it was 30 years ago.

People are living longer.

Many retire before age 65.

Investment returns won’t always resemble historical averages.

Inflation doesn’t move in a straight line.

And everyone’s spending changes over time.

Some retirees spend more in the early years while they’re travelling and enjoying retirement.

Others face higher healthcare costs later in life.

A fixed withdrawal strategy may not reflect how people actually live.

Retirement Isn’t Just About Investments

One of the biggest misconceptions about the 4% rule is that it assumes your investment portfolio is your only source of income.

In reality, many Canadians also receive:

• Canada Pension Plan (CPP)
• Old Age Security (OAS)
• Workplace pensions
• Rental income
• Corporate income
• Part-time employment

These income sources can significantly change how much you need to withdraw from your portfolio each year.

That’s why withdrawal planning should be based on your entire financial picture—not just your investment balance.

Flexibility Is One of the Biggest Advantages

One thing the 4% rule doesn’t account for is human behaviour.

Most retirees don’t spend the exact same amount every year.

If markets experience a significant decline, some people naturally spend less.

If markets perform well, they may choose to spend more.

Being flexible with your withdrawals can often improve the long-term sustainability of a retirement plan.

Retirement isn’t static.

Your income strategy shouldn’t be either.

So… Does the 4% Rule Still Work?

The answer is:

It can.

But it shouldn’t be treated as a guarantee.

For some retirees, withdrawing 4% may be perfectly appropriate.

For others, 3% may be more prudent.

And some may comfortably spend more because they have pensions, lower expenses, or other income sources.

The right withdrawal strategy depends on factors like:

• Your retirement age
• Expected lifespan
• Spending needs
• Tax situation
• Investment mix
• Other sources of income
• Legacy goals

No single percentage can capture all of that.

The Bottom Line

The 4% rule remains one of the most useful retirement guidelines ever developed.

But it was never intended to replace a personalized financial plan.

Think of it as a starting point—not a finish line.

The better question isn’t:

“Can I spend 4%?”

It’s:

“How much can I safely spend while maintaining the lifestyle I want throughout retirement?”

That’s a question that deserves a plan built around your life—not just a rule of thumb.