Investing

Dollar Cost Averaging: Why Timing the Market Is a Fool's Game

You can't time the market. But there's a strategy that doesn't need you to.

Published by NoBS Finance · 20 June 2026 · 6 min read

Key Takeaways

Dollar-cost averaging means investing a fixed amount at regular intervals regardless of market conditions.
You buy more shares when prices are low and fewer when prices are high, which lowers your average cost per share automatically.
Vanguard research shows lump-sum investing beats DCA about 68% of the time, but DCA beats the person who sits in cash waiting for the perfect entry.
DCA can underperform in steadily rising markets because you are buying at progressively higher prices.
The real value of DCA is psychological. It removes the emotional decision of when to invest.

Dollar Cost Averaging: Stop Trying to Time the Market

Every time the market drops, someone says "I will wait for it to bottom." Every time it rises, someone says "I will wait for a pullback." They never buy. Here is the fix.

What Is DCA?

Dollar Cost Averaging means investing a fixed amount at regular intervals, regardless of what the market is doing.

$500 on the 1st of every month
Whether the market is up, down, or sideways
Whether the news is good, bad, or terrifying

Why It Works

You buy more shares when prices are low, fewer when prices are high. Automatically. Without thinking. Without emotion.

Hypothetical example: You invest $500 per month for 3 months into an ETF.

Month	Investment	Price	Shares bought
1	$500	$50	10.0
2	$500	$25	20.0
3	$500	$40	12.5

Total invested: $1,500. Average price across the 3 months: $38.33. But your actual average cost per share is $1,500 divided by 42.5 shares = $35.29. You beat the average by buying more when the price was low. This is a hypothetical example for illustration only.

The Research

Vanguard has published research comparing lump-sum investing (investing all your money at once) to dollar-cost averaging (spreading investments over time). Their findings, based on historical data across multiple markets, show that lump-sum investing outperforms DCA approximately 68% of the time over 10-year periods. This is because markets tend to rise over time, so getting money in earlier is usually better.

But, and this is the key, DCA outperforms the person who tries to time the market and ends up sitting in cash waiting for the "perfect" entry. That person earns nothing while they wait, and often buys in at a higher price than if they had just started on day one.

Source: Vanguard Australia, "A proven way to create wealth" research. The exact figure changes between publications. Check the latest Vanguard Australia research for the current number.

When DCA Underperforms

DCA can underperform in a steadily rising market. If you spread $12,000 over 12 monthly purchases and the market goes up every month, you are buying at progressively higher prices. A lump-sum investor who put all $12,000 in on month 1 would have a better result.

This does not make DCA wrong. The point of DCA is not to maximise returns. It is to remove the emotional decision of when to invest. Most people who try to time the market end up worse off than either DCA or lump-sum investors. DCA is the strategy for people who know they cannot predict the market.

The Psychological Win

The real value of DCA is not mathematical. It is emotional. It removes the decision. You do not have to be brave. You just have to be consistent.

When the market crashes 30%, you do not panic-sell. You buy more shares at the lower price. When it is at all-time highs, you do not feel FOMO. You are already invested.