Asset allocation — how you divide your investment portfolio among different asset classes like stocks, bonds, and cash — is the single most important decision in investing. Research by Brinson, Hood, and Beebower found that asset allocation explains over 90% of the variation in portfolio returns over time. Choosing the right allocation for your age, goals, and risk tolerance will have far more impact on your financial future than any individual stock pick.
Asset allocation is the process of dividing your investment portfolio among different categories of assets. The main asset classes are:
The ratio between these classes determines your portfolio's expected return and expected volatility.
A portfolio of 80% equities / 20% bonds will perform very similarly regardless of whether you hold Canadian banks or global index ETFs within the equity portion. But the difference between an 80/20 allocation and a 60/40 allocation over a market cycle is enormous. During the 2008–09 bear market, global equities fell roughly 50%; a portfolio with 80% equities lost about 40%, while a 60/40 portfolio lost about 25%. The asset allocation, not the stock picks, determined the outcome.
The longer your investment time horizon, the more equity you can hold. Short-term volatility becomes less relevant when you have 20–30 years for the portfolio to recover from downturns. A 25-year-old saving for retirement should hold mostly equities. A 65-year-old drawing income from their portfolio cannot afford a 40% decline and needs more fixed income.
Risk tolerance has two dimensions: financial (can your income support a portfolio decline?) and emotional (will you panic and sell?). The emotional component is often underestimated. Many investors think they're comfortable with risk until they see their $100,000 TFSA drop to $65,000. If that scenario would cause you to sell, you need a more conservative allocation regardless of your time horizon.
Canadians with strong defined benefit pensions (government, teachers, firefighters) effectively already have a large fixed income stream. This allows their investment portfolio to be more aggressively allocated toward equities. CPP and OAS similarly act as bond-like income sources in retirement, potentially allowing a higher equity allocation than a pure "age-based" rule would suggest.
The traditional rule: hold your age in bonds. At 40, hold 40% bonds; at 60, hold 60% bonds. This is now considered too conservative by many planners given longer lifespans and low historical bond returns. A more modern version: hold (your age minus 10) in bonds. A 40-year-old would hold 30% bonds; a 60-year-old, 50% bonds.
Portfolio gradually shifts from growth-oriented to income-oriented as you approach your target date. This is the principle behind target-date retirement funds (common in US 401k plans) and all-in-one ETFs. In Canada, Justwealth offers target-date ETF portfolios for RESP investing — automatically reducing risk as a child approaches university age.
Equal risk contribution from each asset class (as in the All-Weather Portfolio). Typically results in a very bond-heavy portfolio by dollar weight, since bonds have lower volatility than equities. Better for capital preservation, lower for long-term growth.
The easiest implementation of any allocation target is a single all-in-one ETF:
Within your equity allocation, global diversification is essential. Canada represents roughly 3% of global market capitalization. Holding only Canadian stocks exposes you to concentration in financials, energy, and materials — three sectors that dominate the TSX. A globally diversified equity allocation for a Canadian investor typically includes:
Markets move, and over time your actual allocation drifts from your target. Rebalancing — selling over-weight assets and buying under-weight ones — restores your target allocation and systematically forces you to buy low and sell high. Rebalance annually, or when any asset class drifts more than 5 percentage points from its target. All-in-one ETFs rebalance automatically.
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