Dollar-Cost Averaging vs. Lump Sum Investing

You have a lump sum, an inheritance, a bonus, a rollover, and a choice: invest it all at once, or spread it into the market over several months, a strategy called dollar-cost averaging. It feels safer to ease in, and sometimes it is the right call, but the honest answer surprises most people.

Here is what each approach really does, and how to choose.

What dollar-cost averaging does

Dollar-cost averaging means investing a fixed amount at regular intervals rather than all at once. Because you buy more shares when prices are low and fewer when they are high, it smooths out your average purchase price and removes the pressure to time the market. It is automatically what happens when you invest from every paycheck, which is why most people already do it without thinking.

For a windfall, though, dollar-cost averaging means deliberately keeping some of the money out of the market while you feed it in, and that is where the trade-off lives.

What the data says

Because markets rise more often than they fall, investing a lump sum immediately beats averaging in roughly two-thirds of the time. Every month your money sits on the sidelines is, on average, a month of missed growth. Purely by the numbers, getting invested sooner wins more often than not.

So which should you do?

If you can invest a windfall all at once and sleep at night, the odds favor doing so. But investing is emotional, and the worst outcome is putting it all in, watching the market drop, and panic-selling. If averaging in over a few months is what lets you stay the course, the small expected cost is worth it, because a plan you stick with beats an optimal one you abandon. For ongoing savings, keep investing every paycheck; that is dollar-cost averaging working for you by default.

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