4% Rule

Where the rule comes from

The 4% rule grew out of US research that asked a blunt question: looking at every historical 30-year retirement, what starting withdrawal rate would have survived even the worst of them? The method is simple. Take your portfolio value on the day you retire, withdraw 4% of it in year one, then give yourself the same dollar amount plus inflation every year after, no matter what markets do. Run that plan through history, including retirements that began on the eve of the Great Depression and into the brutal inflation of the 1970s, and a balanced portfolio of stocks and bonds made it through every 30-year stretch.

Those results, often called the Trinity study findings, made 4% famous as the "safe withdrawal rate." The subtlety most people miss is that the number was set by history's worst cases, not its averages. In most historical retirements, a 4% start left money to spare, sometimes a great deal of it. The rule is a floor built from bad luck, which is exactly what makes it useful as a planning anchor.

What the rule is, and what it is not

Used well, the 4% rule is two things. First, a planning estimate: it converts a pile of savings into a rough sustainable income. A $500,000 portfolio suggests about $20,000 of first-year withdrawals. Second, it is a savings target in reverse: flip 4% around and you get the famous multiple of 25. If your portfolio must produce $30,000 a year, you need roughly 25 times that, or $750,000, by the day you retire. For someone mid-career wondering "how much is enough," 25 times annual spending is the rule's most practical gift.

What it is not: a guarantee, or a withdrawal autopilot. History rhymes but does not repeat, and no sensible retiree keeps mechanically raising withdrawals with inflation while their portfolio is collapsing. The research assumed a robot investor who never adapts; real plans get to bend, which is a strength the studies never counted.

The Canadian wrinkles

The rule was built on US market data, US account types and US taxes. Four Canadian realities change how it applies here.

• RRIF minimums eventually override it. The year after you convert an RRSP to a RRIF, the RRIF minimum withdrawal forces out a percentage that starts above 5% at 71 and climbs every year afterward, eventually far past 4%. But forced withdrawal is not forced spending: money you do not need can be reinvested in a TFSA or a taxable account, keeping your 4% spending plan intact even while more than 4% leaves the registered account.
• 4% gross is not 4% spendable. Every dollar out of an RRSP or RRIF is fully taxable, TFSA withdrawals are tax-free, and taxable accounts fall in between. Two retirees withdrawing the same 4% can live on very different after-tax incomes depending on where the money sits, so which accounts hold which assets, and which account you draw from first, matters nearly as much as the rate itself.
• Big registered withdrawals can collide with the [OAS clawback](/dictionary/oas-clawback). A large RRIF withdrawal lands on your tax return as income, and enough of it pushes net income over the clawback threshold, quietly taxing away part of your Old Age Security. The withdrawal rate and the withdrawal location have to be planned together.
• Canada gives you an inflation-indexed floor. CPP and OAS pay indexed income for life, so a Canadian portfolio usually only has to cover the gap above government benefits. The US research assumed the portfolio carried the full retirement on its own; when the portfolio's job is smaller, the stakes of the exact withdrawal rate shrink with it.

The honest critiques

The rule has earned real criticism, and three critiques matter most. First, it is built entirely on past performance, mostly one country's markets during a century when that country did exceptionally well. Nothing obliges future returns to be as kind. Second, the research window is 30 years: retire at 60 or 65 and that fits, but retire at 45 and your money must last far longer, which argues for a lower starting rate. Third, the studies assumed essentially free investing. Fees come straight out of the safe rate: a portfolio paying a high MER has meaningfully less growth left to sustain withdrawals, so a high-fee investor following "4%" is really running a riskier plan than the research ever tested.

Modern practice: guardrails, not autopilot

Most planners now treat 4% as a starting point wrapped in flexibility. The greatest threat to any withdrawal plan is sequence of returns risk, a bad market arriving early in retirement, and the best defence is spending that bends: skip the inflation raise after a losing year, trim withdrawals when the portfolio falls behind plan, and allow yourself a raise when markets have been generous. Flexible rules of this kind, often called guardrails, have historically supported starting rates at or above 4% with far less risk of running dry.

Retirees who want part of their income guaranteed no matter what markets do can convert a slice of savings into a life annuity, buying a permanent floor and letting the 4% math apply to a smaller, less critical remainder.