Dollar-Cost Averaging: A Simple Strategy for Long-Term Investors
Instead of trying to time the market, dollar-cost averaging spreads your purchases out automatically. Here's how it works and what it actually buys you.
The strategy, in one sentence
Dollar-cost averaging means investing a fixed dollar amount at regular intervals — say, $300 on the first of every month — regardless of whether prices are up, down, or flat at the time. It's less a sophisticated strategy and more a deliberate refusal to try to time the market.
Why buying at a fixed dollar amount works in your favor
Because you're investing the same dollar amount each time rather than the same number of shares, you automatically buy more shares when prices are low and fewer shares when prices are high. Over many purchases, this tends to bring your average cost per share below a simple average of the price points, since more shares get picked up during the cheaper periods.
What it trades away
If you could reliably predict the single best moment to invest a lump sum, that would beat dollar-cost averaging — investing it all right before a rally, rather than spreading it out. The trouble is nobody can reliably do that, including professional investors. Historical studies comparing lump-sum investing to dollar-cost averaging have generally found that investing a lump sum immediately tends to outperform spreading it out over time, simply because markets have historically risen more often than they've fallen, and time out of the market has a cost. Dollar-cost averaging isn't about maximizing returns — it's about managing behavior and regret.
- It removes the pressure of picking a "perfect" entry point, which paralyzes many would-be investors into not investing at all.
- It smooths out the emotional experience of investing, since no single purchase decision carries the full weight of good or bad timing.
- It works especially well for money you don't have as a lump sum in the first place, like ongoing paycheck contributions.
The version most people already do without naming it
If you contribute to a 401(k) or similar plan every time you're paid, you are already dollar-cost averaging, whether or not you've ever used the term. Each paycheck buys shares at whatever price happens to be current that day, automatically, without any active decision required. This is arguably where the strategy delivers its greatest practical value: not as something to deliberately adopt, but as a reason not to worry about the ordinary ebb and flow of prices along the way.
Dollar-cost averaging won't guarantee you the best possible return. What it reliably guarantees is that you'll actually keep investing through periods when the instinct is to stop.
When a lump sum makes more sense
If you receive a windfall — an inheritance, a bonus, the proceeds from selling a house — and you have a long time horizon and high risk tolerance, investing it as a lump sum has historically had better odds than spreading it out. Dollar-cost averaging that windfall over, say, 12 months is a reasonable compromise for someone who has the money available but isn't emotionally ready to invest all of it at once.
Model your own contributions
Our compound interest calculator shows how regular monthly contributions like these add up over time.
This article is educational and general in nature. It isn’t personalized investment, tax, or legal advice — always weigh your own circumstances, or talk to a licensed professional, before making financial decisions.