DCA: Dollar-Cost Averaging
What it means to invest the same amount every month, how it differs from investing all at once, and how to choose between them.
DCA: Dollar-Cost Averaging
Tom & Fred dialogue
I’ve saved up some money and I’m not sure what to do: invest it all now, or a little at a time, month by month?
Dialogue
I’ve saved up some money and I’m not sure what to do: invest it all now, or a little at a time, month by month?
There are two well-known approaches. The first is to invest the whole amount at once. The second is to invest the same amount at regular intervals, for example every month, whatever the price. The second one is called dollar-cost averaging, or DCA.
And why would I invest a little at a time if I already have the money?
Because you don’t know what the market will do after you buy. With DCA, when prices are low, the same amount buys more units; when they’re high, it buys fewer. That smooths out your average purchase price and reduces the risk of investing everything right before a big drop.
So DCA is the better option?
Not necessarily. Historically, markets have gone up more often than down, so in most periods studied, investing all at once brought a bigger gain, because the money spent more time in the market. A Vanguard study found this happened in about two thirds of cases.
Then why would anyone choose DCA?
Peace of mind. If you invest everything and the market drops right away, it’s hard to handle emotionally. DCA spreads that risk over time. And in fact, many people do DCA without knowing it: when you set aside part of your salary and invest it every month, that’s DCA.
And how do I actually do it?
Many brokers offer automatic investment plans. You choose the amount, the day of the month, and what to buy, usually an ETF, and the rest happens on its own. Just keep an eye on costs: with lots of small purchases, commissions can add up.
So, in the end, which should I choose?
It depends on what you want and how your money comes in. If you already have the full amount and you handle drops well, investing all at once has historically come out ahead more often. If you’d rather spread the risk over time, or you invest from your monthly income, DCA is a simple, disciplined path.