Income replacement is a rough shortcut
You may hear that retirement income should replace a percentage of working income. That can be useful for a first pass, but it is blunt.
A household earning $140,000 and saving aggressively may not need to replace anything close to that income. A household earning $70,000 and spending most of it may need a much higher replacement rate.
Use income replacement only as a quick smell test. Your actual retirement number should start with spending.
Annual spending method
The clean method is to estimate annual retirement spending, subtract reliable income, and calculate the portfolio needed to fund the gap.
Separate essential spending from flexible spending. Essential spending includes housing, food, utilities, insurance, transportation, healthcare, basic travel to family, and taxes. Flexible spending includes bigger travel, gifts, upgrades, restaurants, hobbies, and vehicles.
A household spending $55,000 per year needs a very different portfolio than one spending $110,000. Start with the life you actually plan to fund.
| Step | Question | Output |
|---|---|---|
| 1 | What will you spend per year after tax? | Annual lifestyle target |
| 2 | What reliable income arrives, and when? | CPP/QPP, OAS, pension, annuity, rental income |
| 3 | What gap remains? | Portfolio-funded spending |
| 4 | What withdrawal rate is realistic? | Portfolio target range |
| 5 | What could break the plan? | Inflation, taxes, longevity, healthcare, market sequence |
CPP, OAS, and QPP basics
CPP is the Canada Pension Plan retirement pension. It is based on your contributions and the age you start. In Quebec, the comparable public pension is QPP, administered by Retraite Quebec.
OAS is different. Old Age Security is based mainly on age and Canadian residence, not direct employment contributions. It is taxable and can be reduced for higher-income retirees.
These benefits can reduce the portfolio you need, but the amount and start date matter. Delaying benefits can increase monthly payments, but you need bridge money if you retire before they start.
The 4% rule
The 4% rule is a retirement planning shortcut: multiply the annual portfolio spending gap by 25. If the portfolio needs to provide $40,000 per year, the 4% shortcut points to about $1,000,000.
It is not a promise. The original idea depends on assumptions about market history, inflation, retirement length, asset mix, fees, taxes, and behaviour. Canadian taxes and account types add another layer.
Use 4% as a starting point, then test 3.5%, 3%, and flexible spending cuts. A lower withdrawal rate needs a larger portfolio but gives more room for bad markets or a longer life.
| Annual portfolio spending | At 4% | At 3.5% | At 3% |
|---|---|---|---|
| $30,000 | $750,000 | $857,000 | $1,000,000 |
| $50,000 | $1,250,000 | $1,429,000 | $1,667,000 |
| $75,000 | $1,875,000 | $2,143,000 | $2,500,000 |
| $100,000 | $2,500,000 | $2,857,000 | $3,333,000 |
Inflation changes the target
Inflation is one of the biggest retirement risks because it compounds against your spending. A budget that works at age 60 may not buy the same life at age 80.
Some income sources may be indexed, partially indexed, or not indexed at all. Your personal spending also inflates unevenly: groceries, rent, condo fees, insurance, healthcare, travel, and home repairs can move at different speeds.
Model retirement in real terms when possible. That means using returns after inflation or explicitly increasing spending each year.
Longevity and healthcare
A retirement plan has to last for an uncertain lifespan. Retiring at 55 is not the same math as retiring at 67. Couples also need to plan for the possibility that one spouse lives much longer than the other.
Healthcare is not a zero-cost line item in Canada. Provincial health coverage is valuable, but retirees may still pay for dental care, vision care, prescriptions not covered by their plan, travel medical insurance, mobility needs, home care, private services, and long-term-care-related costs.
A safer plan includes a healthcare reserve and does not assume spending stays perfectly flat in old age.
Example numbers
These are simplified examples to show the method. They are not advice and they ignore many tax details.
| Scenario | Annual spending target | Reliable income | Portfolio gap | Portfolio at 4% |
|---|---|---|---|---|
| Paid-off home, modest lifestyle | $55,000 | $30,000 | $25,000 | $625,000 |
| Renter or condo owner, moderate lifestyle | $80,000 | $35,000 | $45,000 | $1,125,000 |
| Higher travel and family support | $110,000 | $45,000 | $65,000 | $1,625,000 |
| Early retirement bridge before CPP/OAS/QPP | $80,000 | $0 to start | $80,000 until benefits begin | $2,000,000 before bridge planning |
Coast FIRE and retirement pressure
Coast FIRE asks a related question: if you stopped adding to retirement investments today, could the existing portfolio grow enough by retirement age?
It does not mean you can stop working immediately. It means future contributions may no longer need to carry the whole plan, assuming growth, inflation, and timing cooperate.
For Canadians, Coast FIRE still needs CPP/QPP, OAS, RRSP/RRIF tax, TFSA withdrawals, pensions, and healthcare costs built into the final retirement plan.