Limited time offer: Sign up today and get up to 1 year managed free. See details

Get your next rollover managed free in 2018. Learn how to enroll


What Is Dollar Cost Averaging?

What is it? Dollar cost averaging is the practice of regularly investing a fixed amount of money regardless of market activity. This strategy lowers the average cost per share of an investment and eliminates the risk of a single investment at the wrong time.

Betterment Editors

By Betterment Editors
Betterment  |  Published: March 13, 2012

Image Source: Images_of_Money

Stay with me! Sounds complex but in practice it’s really simple: put aside the same amount of money every week (or month) and don’t stop.

Of course, in an ideal world, we would buy stocks at a low price and sell them at a high price – but turns out this is not an easy thing to predict. We (humans) tend to get it wrong.

An Example

How, exactly, does investing regularly lower the average cost of an investment?

Consider this simple case – for the past two years, someone invests $1,000 per week in the S&P 500, for a total investment of $104,000. At the end of the two years, they own 85.6 shares, which are worth $117,638, a return of about 13%.

Now, imagine that this money had instead been invested all at once. Let’s look at a few random dates, say the birthdays of some of the Betterment team:

Betterment Team Birthday Open Value
Kiran Thursday, March 01, 2012 1365.9 $104,623
Alan Friday, February 17, 2012 1358.06 $105,227
Brittany Monday, February 13, 2012 1343.06 $106,402
Sarah Wednesday, January 25, 2012 1314.4 $108,722
Anthony Thursday, September 22, 2011 1164.55 $122,712
Edwin Monday, April 04, 2011 1333.56 $107,160

If Anthony invested the money on his birthday last year (Sept. 22), he would have gained more than the dollar cost average example – happy birthday Anthony! But in every other case the end value was lower, and there’s really no way of predicting the rare occasions the value will be higher.

When prices are low, your money buys more shares, and when prices are high, your money buys less. The important thing is that the average cost per share and your exposure to risk will be lower if you invest regularly.

Why it Matters

In addition to averaging out the cost per share and lessening risk, dollar cost averaging has other benefits: By investing on a set schedule, you avoid the impossible task of trying to time the market. Regardless of market activity, your investment increases, and over time, so will your returns.

How it Works in Betterment:

For dollar cost averaging to be effective, you must regularly purchase shares and continue to do so over time. This will eventually drive the average cost per share down to lower and lower levels.

Betterment’s auto-deposit makes this really simple, and unlike other brokerage accounts, Betterment charges nothing for trades or transfers. Set up a weekly or monthly auto-deposit in your Betterment account and the money will be seamlessly transferred out of your checking and into your investment account.

Balance Risk & Reward:

While you want to avoid the risk of investing at a bad time, you must balance the trade off between risk and reward. In most cases, keeping a large amount of money out of the market is not the right approach to take. In cases where you have a large amount of liquid cash, it may make more sense to invest it at a faster rate, especially with the paltry returns you’ll get from a savings account. Then, keep supplementing regularly to get the benefits of dollar cost averaging. As always, having a good sense for your risk tolerance and timeline is key.

Recommended Content

View All Resources
Take on More Control with Flexible Portfolios

Take on More Control with Flexible Portfolios

You may be an experienced investor who enjoys Betterment but would like to change aspects of our recommended portfolios. Enter Flexible Portfolios.

Roth or Traditional: Which IRA is Right for You?

Roth or Traditional: Which IRA is Right for You?

Individual Retirement Accounts (IRAs) are popular because of their flexibility. We’ll help you choose which one is better for now and the long term.

Betterment’s Approach to Financial Advice: An Overview

Betterment’s Approach to Financial Advice: An Overview

Achieving your financial goals is only possible if you plan effectively. Saving enough, choosing the right accounts, deciding when you can buy a house or when to retire—all of these are essential decisions even before you build an optimal portfolio.

Start investing smarter

With Betterment, you get personalized advice, low and transparent fees, and unlimited access to licensed experts.

Start your investment plan

I am

years old and

  • Not Retired
  • Retired


My annual income is


Experience the new way of investing. Sign up today.

Start investing smarter

Get started

For more information and disclosures about the Betterment Resource Center, click here. | See our contributors.