Dollar-cost averaging is an investment strategy where you invest a fixed amount of money at regular intervals, like monthly or quarterly, to reduce risk and avoid trying to time the market. It is often marketed as a universally safe, smart investing strategy—but it isn’t always the best move. In fact, there are clear scenarios where dollar cost averaging can reduce returns, introduce unnecessary costs, or create a false sense of security.

1.When the market is rising steadily (which it historically does)

Dollar cost averaging can significantly underperform lump-sum investing in upward-trending markets. Since markets go up more often than they go down, spreading your investments out over months means you repeatedly buy at higher and higher prices.

Why it’s bad:

You delay investing money that could have been compounding.

The average cost ends up higher than if you’d invested the lump sum at the start.

You sacrifice potential gains while your cash sits idle.

2.When the reason is purely emotional fear rather than a rational plan

Many people use dollar cost averaging because they’re afraid of “investing at the top.” This is valid emotionally, but not always financially optimal.

Why it’s bad:

It can mask underlying issues like fear of loss or overestimating short-term risk.

You might use dollar cost averaging as a psychological crutch instead of addressing your risk tolerance or asset allocation.

3.When holding cash has a high opportunity cost

Dollar cost averaging requires keeping some portion of your money in cash while you wait to invest it slowly.

Why it’s bad:

Cash loses value to inflation.

If interest rates on savings are low, the idle money is doing nothing.

You miss potential market growth while waiting.

If the expected return of the investment is higher than what your idle cash earns, dollar cost averaging creates a negative drag.

4.When transaction costs are high

Some platforms charge fees per trade or fixed brokerage costs. Dollar cost averaging turns one purchase into many.

Why it’s bad:

Frequent small purchases = many fees.

Those fees become a large percentage of your investment.

The benefit of reduced timing risk is dwarfed by higher costs.

5.When your investment has long-term upward bias and low short-term crash risk

Dollar cost averaging is meant to reduce timing risk, not long-term risk. But for assets like broad stock indexes with strong long-term upward tendencies, timing risk is relatively small compared to long-term opportunity cost.

Why it’s bad?

You reduce expected return without meaningfully improving long-term safety.

Dollar cost averaging makes more sense when the short-term risk is very high—but for diversified, long-term holdings, it’s often unnecessary.

6.When you have a large lump sum and a long investment horizon

If you inherit money, get a bonus, or sell a business, dollar cost averaging is often used to “ease into” the market. But unless you have psychological reasons:

Why it’s bad:

You delay your entry into productive assets.

Lump-sum investing gives better expected outcomes.

The longer your time horizon, the less timing matters.

7.When the strategy provides a false sense of safety

Dollar cost averaging can give people the illusion that they’re mitigating big losses—but it doesn’t protect against fundamentals.

Dollar cost averaging does NOT:

Prevent losses in a long-term bear market.

Protect you from investing in bad assets.

Guarantee a good average price.

Why it’s bad:

People sometimes invest in declining assets thinking dollar cost averaging will fix it.

But if the asset never recovers, your careful averaging doesn’t matter—you simply lose money more slowly.

Dollar cost averaging protects against volatility, not against permanent capital loss.

8.When investing in highly speculative or rapidly declining assets

Dollar cost averaging works best on diversified, long-term assets with high probability of eventual recovery.

But when you apply it to assets with:

• no fundamentals,
• no cash flow,
• hype-driven price swings, or
• real risk of going to zero,

then dollar cost averaging can be outright harmful.

Why it’s bad:

You keep buying into a failing investment.

You’re systematically increasing exposure to something fragile.

It can magnify losses as the asset declines.

Lauren Hua is a private client adviser at Fairmont Equities.

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