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Dollar-Cost Averaging: What It Is and Does It Work?
Summary
Dollar-cost averaging means investing the same amount at regular intervals (e.g. every paycheck). You buy more shares when prices are low and fewer when they’re high. It doesn’t guarantee better returns than a lump sum, but it can reduce the stress of timing and build a habit.
You have $1,200 to invest. Do you put it all in today or spread it over 12 months? Spreading it is dollar-cost averaging: you invest $100 a month (or whatever amount) on a set schedule. When the market is down, your $100 buys more shares. When it’s up, you buy fewer. Over time you get an average price and you never have to decide “is today the right day?”
A lot of people already do this without calling it DCA. If you have a 401(k) and contribute from every paycheck, you’re dollar-cost averaging. The question is whether it’s “better” than investing a lump sum when you have one.
What the research says
Studies that compare lump sum vs DCA often find that lump sum wins more often, because the market tends to go up over time. So if you have a big chunk to invest and you’re comfortable with the risk, putting it in sooner can be rational.
But “on average” doesn’t mean “every time.” If you put a lump sum in right before a crash, you’ll feel terrible. DCA smooths that out. You might give up a bit of expected return in exchange for less regret and less temptation to time the market. For many people that tradeoff is worth it.
When DCA really shines
DCA is especially useful when the money arrives over time (your salary). You don’t have a lump sum; you have $500 a month. Investing that $500 each month is DCA, and it’s a great way to build wealth without waiting for a “good” moment. It also builds a habit. When the market drops, you’re already in the routine of buying, so you keep buying instead of panicking. That’s one reason 401(k)s and automatic contributions work so well for so many people. To see how regular contributions can add up in a retirement account, try our 401(k) Retirement Calculator.
Definitions
- Dollar-cost averaging (DCA)
- Investing a fixed amount of money at regular intervals regardless of price, so you buy more shares when prices are low and fewer when they’re high.
- Lump sum
- Investing a large amount all at once instead of spreading it over time.
FAQ
Is dollar-cost averaging better than lump sum?
Historically, lump sum investing has often come out ahead because the market goes up more often than it goes down. But DCA can reduce the risk of putting everything in at a bad time and can make it easier to stick to a plan.
How often should I invest when using DCA?
Common schedules are every paycheck, once a month, or once a quarter. The key is consistency. Automating the investment (e.g. from your paycheck into a 401(k) or from checking into a brokerage) helps you stay on track.