Knowing you should invest is easy. Knowing how much is harder. Here is a practical framework for calculating your monthly investment target — and how to build toward it if you are not there yet.
This page sits between the beginner guides and the automation pages, so it works best with how to start investing, first-time investor guide Canada, and how to automate your investments in Canada. For account placement, pair it with TFSA vs RRSP for beginners and the retirement side in how much do I need to retire in Canada.
The 15% guideline (and why it varies)
Financial planners widely cite 15% of gross income as the target savings rate for retirement. This rule of thumb assumes:
- You start in your mid-to-late 20s
- You invest for 35–40 years
- You earn approximately 6%–7% average annual returns
- You want to replicate roughly 70%–80% of your pre-retirement income
On a $80,000 gross salary, 15% = $12,000/year = $1,000/month.
But 15% is not right for everyone:
| Your situation | Suggested savings rate |
|---|---|
| Age 22–27, starting fresh | 10%–12% (time does the work) |
| Age 28–35, on track | 12%–15% |
| Age 36–45, behind on savings | 18%–25% |
| Age 46–55, significantly behind | 25%–35%+ (or extend working years) |
| Has a defined benefit pension | Lower personal savings needed — calculate gap |
The power of starting early: compound growth table
The single biggest determinant of your retirement wealth is not how much you save per month — it is when you start.
Assuming 7% average annual return, investing $500/month from different starting ages (retiring at 65):
| Start age | Monthly investment | Total contributed | Value at 65 |
|---|---|---|---|
| 22 | $500 | $258,000 | $1,550,000 |
| 30 | $500 | $210,000 | $810,000 |
| 35 | $500 | $180,000 | $524,000 |
| 40 | $500 | $150,000 | $331,000 |
| 45 | $500 | $120,000 | $199,000 |
Starting at 22 vs 30 (only 8 years earlier, same monthly contribution) produces nearly double the retirement savings. No investment strategy can replicate the effect of time.
How to calculate your personal target
Step 1: Estimate your retirement income target
Take your current after-tax income and multiply by 70%–80%. This is approximately what you will want to spend annually in retirement.
Example: $75,000 after-tax income × 75% = $56,250/year retirement spending goal.
Step 2: Subtract expected government income
From your CPP Statement of Contributions (My Service Canada Account) and OAS eligibility, estimate your government income in retirement.
Example: Estimated CPP $12,000 + OAS $8,700 = $20,700/year.
Step 3: Calculate the savings gap
Annual retirement spending – annual government income = annual savings drawdown.
$56,250 – $20,700 = $35,550/year needed from personal savings.
Step 4: Work backward to the savings target
Using the 4% rule: $35,550 ÷ 0.04 = $888,750 in savings needed.
Step 5: Calculate required monthly investment
Using a future value formula (or a retirement calculator), find the monthly contribution needed to reach your target by your retirement age, assuming a 6%–7% average annual return.
Example:
- Retirement target: $888,750
- Years to retirement: 30 (age 35 to 65)
- Expected return: 7%
- Current savings: $0
Monthly investment needed: approximately $750/month
On a $75,000 income, $750/month is 12% of gross income — within the 10%–15% guideline.
Where to invest your monthly contributions
Recommended order for most Canadians:
Employer RRSP match — Capture 100% of any employer matching first. This is an instant 100% return on that portion of your investment.
TFSA — Contributions are not tax-deductible, but growth and withdrawals are completely tax-free. Particularly valuable if you expect your income in retirement to be similar to or higher than today.
RRSP — Contributions are tax-deductible (immediately reduces your tax bill). Valuable when your marginal rate today is higher than your expected withdrawal rate in retirement.
Non-registered — After TFSA and RRSP are maximized, invest in a non-registered account. Capital gains receive preferential tax treatment (taxed at 50% inclusion).
For most Canadians with under $100,000 income: TFSA first, then RRSP. For Canadians earning $100,000+: RRSP first (for the deduction), then TFSA.
See: How Much TFSA Room Do I Have? and How Much RRSP Room Do I Have?
If you can’t hit 15% right now
Most people cannot start at 15%. Here is a realistic ramp-up approach:
| Year | Approach |
|---|---|
| Now | Automate whatever you can afford — even $100/month |
| Next raise | Redirect 50% of the raise to investments (so you still see a net income increase) |
| Year 2 | Increase by 1% of income |
| Year 3 | Increase by 1% of income |
| Year 5 | Reassess and set a new target |
Automating contributions — setting up a monthly transfer to your TFSA or RRSP on the same day as your payday — is more effective than reviewing your budget and deciding each month whether to invest. The habit of automation compounds as powerfully as the interest.
Monthly investment by income (15% guideline)
| Annual income | Monthly 15% target |
|---|---|
| $40,000 | $500/month |
| $55,000 | $688/month |
| $70,000 | $875/month |
| $85,000 | $1,063/month |
| $100,000 | $1,250/month |
| $120,000 | $1,500/month |
Related resources
- How Much Do I Need to Retire? — The full retirement number framework
- How Much TFSA Room Do I Have? — Check your available contribution room
- How Much RRSP Room Do I Have? — Know your RRSP capacity
- How Much Emergency Fund Do I Need? — Build this first before investing aggressively