Dollar-Cost Averaging
Investing a little, regularly. Dollar-cost averaging means investing a fixed amount on a schedule. How it works, a simple example, its pros and cons versus investing a lump sum.
Wall Street, New York: Acediscovery, CC BY 4.0
How it works
Dollar-cost averaging, or DCA, means investing the same amount of money at regular intervals, such as every payday, no matter what the market is doing. If you put 200 dollars a month into an index fund, you automatically buy more shares when prices are low and fewer when prices are high. Most people already do this through workplace retirement plans.
A simple example
Imagine a fund priced at 20 dollars in January, 16 dollars in February and 25 dollars in March. Investing 200 dollars each month buys 10 shares, then 12.5 shares, then 8 shares, for 30.5 shares in total at an average cost of about 19.67 dollars each, a little below the simple average price. The benefit comes from buying more when prices dip.
DCA vs lump sum
If you already have a large sum to invest, research by Vanguard found that investing it all at once has historically beaten spreading it out about two thirds of the time, because markets tend to rise over time. But DCA can reduce regret if prices fall right after you invest, and it is easier for many people emotionally. Both beat leaving money uninvested for years while waiting for the perfect moment.
Key takeaways
Investing a fixed amount on a schedule builds discipline and removes guesswork. It naturally buys more shares when prices fall. A lump sum has historically done better more often, but DCA can make investing feel easier. The most important thing is to start, stay consistent and keep costs low. Automate it so you do not have to remember.
Making it automatic
Set up an automatic monthly investment into a low-cost diversified fund and review it once or twice a year. Increase the amount when you get a raise. The real power of DCA is consistency: it turns investing into a habit rather than a decision you have to keep making.
This page is general education, not financial, tax or legal advice. Everyone's situation is different, so check official sources and consider talking to a licensed professional before big decisions.
- Wall Street, New York: Acediscovery, CC BY 4.0
Text written by Biggest Bossman.
