beginner
9 min read

10 Common Investing Mistakes and How to Avoid Them

From timing the market to ignoring fees—mistakes that cost investors money and how to avoid them.

1. Trying to Time the Market

Nobody can consistently predict highs and lows. Stay invested. Use dollar cost averaging. Time in the market beats timing the market.

2. Panic Selling in a Crash

Selling when markets drop locks in losses. Those who held through 2008–2009 participated in the recovery. Have a plan before the crash—and stick to it.

3. Ignoring Fees

1% fees may not sound like much, but over 30 years they can cost you hundreds of thousands. Choose low-cost index funds (under 0.2%).

4. Putting All Eggs in One Basket

One stock, one sector, or one country = concentrated risk. Diversify across asset classes and geographies.

5. Chasing Performance

Last year's winner often becomes next year's loser. Stick to a strategy. Avoid buying whatever just went up.

6. Not Investing Early Enough

Every year you wait costs you compound growth. Start with whatever you can—even $50/month. Increase over time.

7. Trading Too Much

Trading triggers fees and taxes. Buy-and-hold with occasional rebalancing is usually better.

8. Ignoring Tax Efficiency

Use tax-advantaged accounts. Hold tax-inefficient investments (bonds, REITs) in IRAs when possible. Harvest losses in taxable accounts.

9. Letting Emotions Drive Decisions

Fear and greed lead to bad timing. Automate contributions. Write an investment policy statement. Review it when you're calm.

10. Not Reviewing Periodically

Life changes. Revisit your allocation and goals annually. Adjust as needed—but don't over-tinker.

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10 Common Investing Mistakes and How to Avoid Them | Investors Lab | Investors Lab