Asset allocation is how you divide your investments between different types of assets, such as stocks, bonds and cash. Research and experience suggest it is one of the biggest drivers of how your portfolio behaves over time, often more important than which individual funds you choose.
The main asset classes
- Stocks: highest long-term growth potential, but the biggest swings.
- Bonds: lower growth, usually steadier, and they pay interest.
- Cash: stable and easy to access, but it can lose value to inflation.
- Alternatives: property, commodities and crypto, usually a smaller slice.
Why asset allocation matters
A portfolio with 90% stocks might fall 35% or more in a severe downturn, while one with 50% stocks might fall far less. Neither is right or wrong. The right mix balances the growth you need with the swings you can live with, without panic-selling.
Example portfolios by age
| Stage | Example mix | Why |
|---|---|---|
| 20s | 90% stocks / 10% bonds | Decades to recover from downturns |
| 30s | 80% / 20% | Still growth-focused, more responsibilities |
| 40s | 70% / 30% | Balancing growth and stability |
| 50s | 60% / 40% | Protecting what you have built |
| Retirement | 40–50% stocks | Income and stability, with some growth |
These are illustrations, not rules. A common shortcut is “110 minus your age” in stocks, but your goals and comfort with risk matter more than any formula.
How to choose your asset allocation
- Time horizon: money needed within five years should not be heavily in stocks.
- Risk tolerance: imagine your portfolio dropping 30%. Would you hold or sell?
- Goals: retirement, a home deposit and an emergency fund each need a different mix.
- Other income: a stable job lets some people take more investment risk.
See how different growth rates change long-term outcomes with our Compound Interest Calculator.
Simple ways to get the mix right
- Target-date funds: one fund that shifts automatically as you age.
- All-in-one ETFs: popular in Canada and the UK, holding a fixed stock-bond mix.
- Three-fund portfolio: home-country stocks, international stocks and bonds.
Rebalancing
Over time, your mix drifts. If stocks rise strongly, an 80/20 portfolio might become 88/12, which is riskier than you planned. Rebalancing means selling a little of what grew and buying what lagged, or directing new money to the underweight asset. Many investors rebalance once a year or when an asset drifts more than five percentage points.
Common asset allocation mistakes
- Being too conservative in your 20s and missing decades of growth.
- Holding lots of funds that own the same companies.
- Changing your mix after every market headline.
- Ignoring currency risk; Nigerian investors in particular may want some foreign-currency assets.
Plan how your mix supports early financial independence with our FIRE Calculator.
Asset allocation for different goals, not just age
Age is a helpful starting point, but your asset allocation should really be set goal by goal. The same 25-year-old might need three very different mixes:
| Goal | Time horizon | Example mix |
|---|---|---|
| Emergency fund | Any time | 100% cash |
| House deposit | 2–5 years | Mostly cash and short-term bonds |
| Retirement | 30+ years | Mostly stocks |
Thinking this way stops you from taking stock-market risk with money you need soon, or keeping retirement money in cash for decades where inflation slowly eats it.
Also consider your “human capital”. If your job income is very stable, you may be able to hold more stocks. If you work in a volatile industry or freelance, a slightly larger cash and bond cushion can help you sleep at night. Review your allocation once a year, after big life changes such as a new job, marriage or a home purchase, and whenever your goals shift.
For official, up-to-date guidance, see Investor.gov’s guide to asset allocation.
Frequently asked questions
What is a good asset allocation for a 25-year-old?
Many young investors with long time horizons hold mostly stocks, such as 80% to 90%, but it depends on your goals and how you handle market falls.
Is a target-date fund enough?
For many people, yes. It handles asset allocation and rebalancing automatically. Check the fees first.
How often should I rebalance?
Once a year is common, or when your mix drifts several percentage points from your target.
Asset allocation: key takeaways
- Asset allocation is your mix of stocks, bonds, cash and alternatives.
- Younger investors can usually take more stock risk.
- Choose a mix you can stick with during downturns.
- Rebalance periodically to stay on target.
Last reviewed: October 2026. This article is general education, not personal financial, tax or legal advice. Rules, rates and limits change, so check official sources or speak to a qualified professional before making decisions. See our Financial Disclaimer.