—how you divide money between different types of investments—is the most important investment decision you'll make.
Why It Matters
Studies show that asset allocation determines about 90% of your portfolio's returns over time. Not stock picking. Not market timing. Just the mix.
| Asset Class | Risk Level | Historical Return | Best For |
|---|---|---|---|
| Stocks | High | 7-10%/year | Long-term growth |
| Bonds | Low-Medium | 3-5%/year | Stability, income |
| Cash | Very Low | 0-2%/year | Short-term needs |
| Real Estate | Medium | 4-8%/year |
The Risk-Return Tradeoff
100% Stocks:
- Best year: +37%
- Worst year: -37%
- Long-term average: ~10%
60% Stocks / 40% Bonds:
- Best year: +28%
- Worst year: -22%
- Long-term average: ~8%
The second portfolio made less but with WAY less stomach-churning volatility.
Allocation By Age (Rules of Thumb)
The "Age in Bonds" Rule
Your age = percentage in bonds
- Age 25: 25% bonds, 75% stocks
- Age 45: 45% bonds, 55% stocks
- Age 65: 65% bonds, 35% stocks
The "110 Minus Age" Rule (More Aggressive)
110 - your age = percentage in stocks
- Age 25: 85% stocks
- Age 45: 65% stocks
- Age 65: 45% stocks
Building Your Allocation
Step 1: Determine Your Time Horizon
| Time Until You Need Money | Stock Allocation |
|---|---|
| 20+ years | 80-100% |
| 10-20 years | 60-80% |
| 5-10 years | 40-60% |
| Under 5 years | 0-40% |
Step 2: Assess Your Risk Tolerance
Honest questions:
- If your portfolio dropped 30%, would you panic sell?
- Do market fluctuations keep you up at night?
- Can you afford to lose some money short-term?
If you can't stomach volatility, reduce stock allocation.
Step 3: Keep It Simple
A three-fund portfolio works for most people:
- US Stocks: 50-60%
- International Stocks: 20-30%
- Bonds: 10-30%
Rebalancing
Over time, your allocation drifts as different assets grow at different rates.
Example:
- Start: 70% stocks, 30% bonds
- After a good stock year: 80% stocks, 20% bonds