Top 10 DIY Investor Mistakes (and how to avoid them)
Thu Jan 29 2026
Most DIY investors don’t have an investing problem—they have a behavior problem, and this episode proves it with hard numbers: over the last 10 years, the average investor trailed the S&P 500 by about 3.3% per year, and even over 20 years they lagged by roughly 1.1% per year. We break down the 10 most common mistakes—from panic-selling and market timing to performance chasing, poor diversification, and treating investing like entertainment. Then we lay out an “advisor-like” improvement plan you can implement immediately: a one-page investing rulebook, automation, and a simple rebalancing system designed to keep emotions from hijacking results. We wrap with practical guidance for listeners who decide they want professional help, including what to look for in a fiduciary CFP® at a Registered Investment Advisor.
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Most DIY investors don’t have an investing problem—they have a behavior problem, and this episode proves it with hard numbers: over the last 10 years, the average investor trailed the S&P 500 by about 3.3% per year, and even over 20 years they lagged by roughly 1.1% per year. We break down the 10 most common mistakes—from panic-selling and market timing to performance chasing, poor diversification, and treating investing like entertainment. Then we lay out an “advisor-like” improvement plan you can implement immediately: a one-page investing rulebook, automation, and a simple rebalancing system designed to keep emotions from hijacking results. We wrap with practical guidance for listeners who decide they want professional help, including what to look for in a fiduciary CFP® at a Registered Investment Advisor.