The 4% Rule and Its Canadian Caveats

Where the 4% rule actually comes from

The rule traces back to research from the 1990s (financial planner William Bengen, later the Trinity study) that tested withdrawal rates against decades of historical U.S. stock and bond returns. The finding: a retiree who withdrew about 4% of a balanced portfolio in year one, then increased that dollar amount with inflation each year after, would not have run out of money over any historical 30-year period tested.

That's a specific, narrow claim. It assumes a particular asset mix (roughly 50-75% stocks), a 30-year retirement, U.S. market history repeating itself, and no flexibility in spending. Change any one of those assumptions and the "safe" number moves. It was never meant to be a precise instruction — it's a rough sanity check, and most of the researchers behind it have said so themselves.

Why sequence of returns matters more than the average

The 4% rule survives because it's stress-tested against the worst starting points in the historical record, not the average ones. A portfolio that loses value in the first few years of retirement, while you're also withdrawing from it, can be permanently damaged even if long-run average returns end up fine — this is called sequence-of-returns risk.

In practice this means the rule is far more conservative than it looks in a good market and can still fail in a genuinely bad one. It also means the calendar year you retire in matters more than most people expect, which is a strong argument for building in flexibility rather than locking in a fixed withdrawal from day one.

The Canadian caveats: RRIFs, taxes, and CPP/OAS

Three Canadian-specific mechanics push the American version of the rule out of shape.

• RRIF minimum withdrawals: Once RRSP savings convert to a Registered Retirement Income Fund, the CRA requires you to withdraw a minimum percentage each year, and that percentage rises with your age. In your 70s and beyond, the mandated minimum can exceed 4% regardless of what your spending plan calls for — confirm the current age-based percentages directly with the CRA, since they're set in the Income Tax Act and can be adjusted.
• Taxation is baked into the withdrawal, not separate from it: A U.S. 401(k) or a TFSA-style account each tax differently, and in Canada your RRSP/RRIF withdrawals are taxed as regular income, TFSA withdrawals are tax-free, and non-registered accounts trigger capital gains or dividend tax. The 4% you pull out of an RRIF is worth less after tax than 4% out of a TFSA, so the "safe" withdrawal rate is really a blend across account types, not one number.
• CPP and OAS are an inflation-indexed floor: Most Canadian retirees have a government pension layer that a pure 4%-of-portfolio calculation ignores. That floor can let you draw down savings faster in early retirement, or more slowly if you're relying on savings to bridge the years before you start CPP/OAS — and OAS also has a clawback for higher-income retirees, so check current thresholds with the CRA before assuming you'll keep all of it.

A more realistic way to use it

Treat 4% as a starting anchor, not a fixed rule, and build in a mechanism to adjust. Many planners now use "guardrails": spend more in strong market years, cut back in weak ones, rather than mechanically raising withdrawals with inflation no matter what markets do.

Model your RRIF minimums separately from your discretionary withdrawals, since those minimums are mandatory once they kick in — money you're forced to withdraw but don't need can often be redirected into a TFSA to keep growing tax-free. And run your own numbers with a drawdown tool rather than relying on a single industry rule of thumb, since your asset mix, retirement length, and pension income all shift the sustainable number in either direction.

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