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Dollar cost averaging is an investing strategy that can help you lower the amount you pay for investments and minimize risk. Instead of purchasing investments at a single price point, with dollar cost averaging you buy in smaller amounts at regular intervals, regardless of price. Over the long term, dollar cost averaging can help lower your investment costs and boost your returns.

What Is Dollar Cost Averaging?

Dollar cost averaging is a strategy to manage price risk when you’re buying investments, like stocks or mutual funds. Instead of investing in a particular asset one time, with a single purchase at one price, with dollar cost averaging you divide up the amount of money you’d like to invest and buy small quantities of the asset over time at regular intervals. This decreases the risk that might pay too much for an investment before market prices drop.

Prices don’t only move one way, of course. But if you divide up your purchase and make multiple buys, you maximize your chances of paying a lower average price over time. In addition, dollar cost averaging helps you get your money to work on a consistent basis, which is a key factor for long-term investment growth.

If you have a workplace retirement plan, like a 401(k), you’re probably already using dollar cost averaging by default for at least some of your investing.

Market Timing vs Dollar Cost Averaging

Dollar cost averaging works because over the long term, asset prices tend to rise. But asset prices do not rise consistently over the near term. Instead, they run to short-term highs and lows that may not follow any predictable pattern.

Many people have attempted to time the market and buy assets when their prices appear to be low. This sounds easy enough, in theory. In practice, it’s almost impossible—even for professional stock pickers—to determine how the market will move over the short term. Today’s low could be a relatively high price next week. And this week’s high might look like a fairly low price a month from now.

It’s only in retrospect that you can identify what favorable prices would have been for any given asset—and by then, it’s too late to buy. When you wait on the sidelines and attempt to time your asset purchase, you frequently end up buying at a price that’s plateaued after the asset has already made big gains.

And trying to time the market can really cost you. According to research by Charles Schwab, investors who tried to time the market saw drastically less gains than those who regularly invested with dollar cost averaging.

How Does Dollar Cost Averaging Work?

Dollar cost averaging takes the emotion out of investing by having you purchase the same small amount of an asset regularly. This means you buy fewer shares when prices are high and more when prices are low.

Say you plan to invest $1,200 in Mutual Fund A this year. You have two choices: You can invest all of your money at once at the beginning or the end of the year—or you can invest $100 each month.

While it might not seem like choosing one approach or the other would make much of a difference, if you spread out your purchases in $100 monthly portions over 12 months, you may end up with more shares than you would if you bought everything at once. Consider this hypothetical 12-month result:

In the example above, you would end up saving 42 cents a share by spreading out your investments over 12 months instead of investing all of your money one time.

  • If you bought $1,200 worth of Mutual Fund A at a price of $10 per share in January or December, you would own 120 shares.
  • If you bought $100 worth of Mutual Fund A a month for 12 months, your average price per share would be $9.58, and you would own 125.24 shares.

In this example, dollar cost averaging buys you more shares at a lower price per share. When Mutual Fund A increases in value over the long term, you’ll benefit from owning more shares.

Dollar Cost Averaging Helps Those With Less to Invest

From a practical standpoint, dollar cost averaging helps you begin investing with small amounts of money.

You may not, for example, have a large sum to invest all at once. Dollar cost averaging gets smaller amounts of your money into the market regularly. This way, you don’t have to wait until you have a larger amount saved up to benefit from market growth.

Dollar cost averaging’s regular investments also ensure you invest even when the market is down. For some people, maintaining investments during market dips can be intimidating. However, if you stop investing or withdraw your existing investments in down markets, you risk missing out on future growth.

Those who remain invested during bear markets, for instance, historically have seen better returns than those who withdraw their money and then try to time a market return, according to Charles Schwab research.

Does Dollar Cost Averaging Really Work?

Outside of hypothetical examples, dollar cost averaging doesn’t always play out neatly. In fact, research from the Financial Planning Association and Vanguard has found that over the very long term, dollar cost averaging can underperform lump sum investing. Therefore, if you do have a large sum of money, you’re generally better off investing it as soon as possible.

But don’t take this research at face value. You may not have a large amount of money saved up—and waiting may cause you to miss out on potential gains. It can be stressful to invest a lot of money at once, and it may be easier psychologically for you to invest portions of a large sum over time.

In addition, dollar cost averaging still helps your money grow. In the Financial Planning Association’s and Vanguard’s research, investors who used dollar cost averaging did see significant investment growth—just slightly less most of the time than if they had invested a lump sum.

Also, keep in mind that lump sum investing only beat dollar cost averaging most of the time. A third of the time, dollar cost averaging outperformed lump sum investing. Because it’s impossible to predict future market drops, dollar cost averaging offers solid returns while reducing the risk you end up in the 33.33% of cases where lump sum investing falters.

Who Should Use Dollar Cost Averaging?

You might consider dollar cost averaging if you’re:

  • Beginning to invest and only have smaller amounts to buy shares.
  • Not interested in all the research that goes along with market timing.
  • Making regular investments each month in retirement accounts, like an IRA or a 401(k).
  • Unlikely to keep investing in down markets.

You might prefer another investment strategy if:

  • You have a large sum to invest.
  • You’re investing in mutual funds that have higher initial investment minimums through a taxable brokerage account.
  • You enjoy trying to time the market and don’t mind the extra time and research.
  • You’re investing for the short term.

The Bottom Line

As a long-term investment strategy, dollar cost averaging keeps you in the market and makes you buy shares even when the market is down. Because dollar cost averaging takes the emotion out of purchasing decisions, especially in down markets, it helps you position yourself and your investments for success over years and decades.

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