“How much do I need to retire?” sounds like it needs a crystal ball, but the starting point is refreshingly concrete: it is a question about your spending, not your salary. Once you know roughly what a year of your retired life costs, a couple of simple rules of thumb turn that number into a savings target you can actually aim at.
Those rules are estimates, not promises. But they give you a defensible first number — one you can refine as the date gets closer and the picture gets clearer.
Start with annual spending, not income
The single most useful figure is what you expect to spend in a typical retirement year, in today’s dollars. Some costs fall away when you stop working — payroll taxes, commuting, and the retirement contributions themselves. Others can rise, especially healthcare and travel early on. A common shortcut is the replacement rate: many households land somewhere around 70–85% of their pre-retirement income, but your own number depends entirely on your plans.
Retirement planning is mostly a spending question wearing a savings costume. Nail down the yearly number and the rest is arithmetic.
The 25x rule and the 4% withdrawal idea
The best-known shortcut multiplies your annual spending by 25. If you expect to spend $50,000 a year from your portfolio, the 25x rule points to a target of roughly $1.25 million. That multiplier is simply the flip side of the 4% rule: withdrawing about 4% of a starting balance each year (adjusted for inflation) historically stood a good chance of lasting a 30-year retirement, based on past U.S. market returns.
Two things are worth stressing:
- It is a rule of thumb, not a guarantee. It rests on historical data and a fixed horizon; real markets and real lifespans vary.
- It counts only what your portfolio must cover. Subtract other income first — Social Security or CPP/OAS, a pension, rental income — so you multiply just the gap.
Where your accounts sit (US and Canada)
The target is the same idea on both sides of the border; the containers differ. In the U.S., you are likely filling a 401(k) and an IRA (Roth or traditional). In Canada, the workhorses are the RRSP and the TFSA. A crucial wrinkle: money in a traditional 401(k) or an RRSP is taxed on withdrawal, so a $1 million balance is not $1 million of spendable cash. Roth and TFSA withdrawals are generally tax-free, which makes those dollars worth more at the till. Building your target around after-tax spending keeps the comparison honest.
The caveats that move the number
- Inflation. Prices roughly double over a few decades at historically ordinary rates, so plan in real (inflation-adjusted) terms.
- Healthcare. Often one of the largest and least predictable line items, particularly in the years before public coverage fully kicks in.
- Longevity and sequence risk. A longer retirement or a bad run of returns early on can strain a 4% withdrawal, which is why some planners prefer a more cautious 3.25–3.5%.
Treat 25x as a target to sanity-check, not a finish line to obsess over. Run your own spending number, subtract guaranteed income, and revisit it every few years.