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The Hidden Pitfalls of DIY Investing

The Hidden Pitfalls of DIY Investing

July 10, 2026

Why Good Intentions Don't Always Lead to Good Results

The rise of online brokerage accounts, investing apps, and financial content on social media has made it easier than ever to invest on your own. For many people, that accessibility is a positive development. Taking ownership of your finances is an important step toward building wealth.

However, after working with families, retirees, business owners, and investors for many years, I've noticed something interesting:

The biggest risk to a DIY investor usually isn't the stock market.

It's the investor.

Most people don't lose because they choose the wrong mutual fund or ETF. They lose because of behavioral mistakes, lack of discipline, or simply failing to follow through on a long-term plan.

Here are some of the most common pitfalls I see among DIY investors.

1. Funding the Account but Never Investing the Money

This may be the most common mistake of all.

An investor opens an IRA, Roth IRA, brokerage account, or 401(k) rollover account and successfully transfers money into the account. They feel accomplished because they've taken action.

Then the money sits in cash.

Weeks turn into months. Months turn into years.

Many investors don't realize that opening the account and funding it is only the first step. The money must actually be invested according to a strategy.

I've seen investors unknowingly leave tens or even hundreds of thousands of dollars sitting in money market funds while the stock market continued to grow.

Opening the account is important. Investing the money is what creates growth.

2. Starting Strong but Stopping Future Contributions

Many investors begin with great intentions.

They open an account, contribute regularly for a few months, and then life gets busy. Contributions stop.

The challenge is that long-term wealth isn't typically built through one large investment. It's built through consistent contributions over many years.

The most successful investors treat investing like a monthly bill. Contributions happen automatically whether the market is up, down, or sideways.

Consistency often matters more than finding the perfect investment.

3. Getting Out of the Market and Never Getting Back In

Market declines are uncomfortable.

Whether it's the financial crisis, COVID, inflation concerns, geopolitical events, or election uncertainty, every generation experiences reasons to be fearful.

Many DIY investors sell during periods of market volatility because they believe they can get back in later.

The problem is that getting out is easy.

Getting back in is hard.

Investors often wait for the "right time" to re-enter the market. Unfortunately, the market usually begins recovering before the news improves.

Some of the strongest market days occur during periods of uncertainty. Missing just a handful of those recovery days can dramatically reduce long-term returns.

Successful investing requires discipline during both good markets and bad ones.

4. Making Investing More Complicated Than It Needs to Be

Many investors start with a simple strategy.

Then they begin watching financial television, reading blogs, listening to podcasts, and following social media influencers.

Before long they own:

  • Growth funds
  • Value funds
  • Dividend funds
  • Sector funds
  • Technology funds
  • AI funds
  • Crypto investments
  • International funds
  • Individual stocks

What started as a simple portfolio becomes a confusing collection of investments with no clear purpose.

Complexity often creates confusion. Confusion often leads to poor decisions.

A good investment strategy should be understandable, repeatable, and aligned with your goals.

5. Buying the Same Strategy Multiple Times

Many investors believe they are diversified because they own several different funds.

In reality, they often own the same companies repeatedly.

For example, an investor may own:

  • An S&P 500 Index Fund
  • A Large Cap Growth Fund
  • A Technology Fund
  • A Dividend Fund

While these sound different, many of the same companies appear throughout all four investments.

Owning multiple funds does not automatically create diversification.

True diversification requires understanding what you actually own, not simply how many positions appear on your statement.

6. Ignoring Other Asset Classes

When markets are doing well, many investors become concentrated in a single asset class.

Some become heavily invested in large U.S. stocks.

Others concentrate in technology stocks.

Others put everything into real estate or cryptocurrency.

Diversification is not exciting.

It's often uncomfortable because some parts of the portfolio will always appear to be underperforming.

However, diversification exists for one purpose: risk management.

Different asset classes often perform differently under various economic conditions. A diversified portfolio helps reduce the impact of any single area experiencing significant losses.

7. Day Trading Instead of Investing

Social media has created the illusion that investing should be exciting.

Day trading, options trading, meme stocks, and constant market speculation receive enormous attention online.

The reality is that wealth is rarely built through excitement.

Most successful investors build wealth through:

  • Time
  • Discipline
  • Consistent saving
  • Long-term ownership

Investing should often feel boring.

If your investment strategy feels like entertainment, it may not be investing at all.

8. Investing in Things You Don't Understand

Financial products continue to become more sophisticated.

Today investors have access to:

  • Leveraged ETFs
  • Inverse funds
  • Option overlay strategies
  • Structured products
  • Cryptocurrency derivatives
  • Complex alternative investments

Many of these investments can serve legitimate purposes when used appropriately.

The problem occurs when investors purchase products they don't fully understand.

A good rule of thumb:

If you cannot explain how an investment works in plain English, you probably shouldn't own it.

Never invest based solely on performance, marketing materials, or social media recommendations.

9. Becoming Obsessed With Costs While Ignoring Outcomes

Unnecessary costs should be avoided.

Fees should always be evaluated.

However, many investors focus exclusively on expense ratios while ignoring larger issues.

Saving 0.25% on fund expenses may feel productive.

But avoiding a 20% emotional mistake during a market downturn can have a far greater impact on long-term results.

The lowest-cost investment strategy is not always the most effective strategy.

The goal is not to minimize fees.

The goal is to maximize the probability of achieving your financial objectives.

10. Failing to Align Investments With Your Values

Many investors spend considerable time researching performance but very little time understanding what they actually own.

Large index funds are market-cap weighted, meaning they allocate more money to the largest companies regardless of your personal values or beliefs.

For some investors, this isn't a concern.

For others, particularly faith-based investors, understanding where their money is invested is important (Is ESG over-emphasized?). 

Your investment strategy should not only support your financial goals but also reflect the principles and values that matter most to you and your family.

The Bottom Line

DIY investing can absolutely work.

Many investors are capable of managing their own portfolios successfully.

The challenge isn't usually knowledge.

It's discipline.

It's consistency.

It's avoiding emotional decisions.

It's maintaining a strategy through market cycles.

Whether you invest on your own or work with a financial advisor, the most important factor is having a clear plan and the discipline to follow it.

Successful investing isn't about predicting the future.

It's about consistently doing the right things over a long period of time.

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