The 4% rule: Canadian planning method and limits

1. What historical withdrawal studies measure

Bengen (1994) studies inflation-adjusted withdrawals from U.S. portfolios. The finding commonly summarized as “4% over 30 years” depends on his data and assumptions, not a future guarantee.

The 1998 Trinity study examines different allocations and 15- to 30-year horizons with U.S. data from 1926 to 1995. It distinguishes nominal and inflation-adjusted withdrawals and excludes taxes and transaction costs.

A historical success rate counts past periods ending with a positive portfolio value. It is not an individual probability of success or a promise to preserve the initial capital.

2. The mechanics: an initial amount, then inflation

In the classic version, a hypothetical initial $1,000,000 portfolio supports a first withdrawal of $40,000. With hypothetical 2% inflation, the next withdrawal becomes $40,800. That amount may no longer equal 4% of the current balance.

The starting formula is illustrative capital = initial annual withdrawal ÷ initial rate. The withdrawal is not necessarily an after-tax spending budget.

3. In Canada: use personal pensions, not the maximums

Estimate CPP or QPP from your contribution history, then OAS from your eligibility. Do not count two maximum CPP and QPP pensions for the same career: the plans coordinate entitlements. Personal payments may be lower than published maximums.

OAS amounts are reviewed quarterly: multiplying October’s rate by 12 does not establish a guaranteed annual payment. For July 2026 to June 2027 recovery, the starting threshold is $93,454 of 2025 net world income, not one threshold for every year.

Start dates also matter: CPP may start from age 60 to 70; QPP deferral increases stop at age 72. Model the actual dates rather than assuming all income begins at 65.

4. Separate net spending and gross withdrawals

• RRSP/RRIF: withdrawals are generally taxable. By the end of the year you turn 71, RRSP options include withdrawal, transfer to a RRIF or purchase of an annuity. A RRIF subsequently has minimum withdrawals; it is not the only option.
• TFSA: withdrawals are generally tax-free and do not affect federal income-tested benefits. Contribution room is personal: eligibility, residency, previous contributions and withdrawals matter; a national cumulative total is not your individual limit.
• Non-registered: sale proceeds may include the invested principal and a gain or loss. Treatment depends on the income and transaction; the whole withdrawal is not automatically taxable income.

There is no universal 10% or 15% gross-up from net spending to gross withdrawals. Other income, credits, benefits, province and family circumstances change the calculation.

5. An example of a funding gap, not a personal target

Purely educational assumption: at a particular date, the net budget is $40,000 and other net income is assumed to be $15,000. The portfolio must then provide $25,000 net. The $15,000 is neither an average pension nor an announced entitlement.

1. The net gap is 40,000 − 15,000 = $25,000.
2. Converting it to a gross withdrawal requires the accounts and taxes to be specified. Only if withdrawals are assumed to generate no tax does 25,000 ÷ 0.04 give $625,000.
3. This is not a validated retirement target. Before other income starts, the gap may differ; a year-by-year projection is needed.

Simply adding five annual budgets to capital calculated for a later date ignores returns, inflation, taxes and the changing balance. A retirement “bridge” must be modelled as a sequence of cash flows, not a certainty produced by one addition.

6. Test the limitations before selecting a rate

• Duration and longevity: a 30-year scenario does not automatically validate 50 years of withdrawals.
• Sequence of returns: early losses alongside withdrawals can reduce assets available for a recovery; average return is not enough.
• Fees and taxes: they reduce resources, but “1% in fees = exactly one percentage point less sustainable withdrawal” is not a general identity.
• Inflation and spending: distinguish essential, flexible and unexpected costs. Cutting a withdrawal changes the scenario; it does not guarantee success.
• Markets and currency: historical U.S. research does not validate a current Canadian portfolio.

Comparing 3%, 4% or another rate is sensitivity analysis, not an age-based recommendation. A lower rate alone does not guarantee a perpetual portfolio. Our detailed FIRE calculator explores assumptions without replacing individual tax and financial planning.

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