Recurring vs. Lump-Sum Investing: A Look at Historical Data
If you came into about $8,900 of spare cash, is it better to invest it all at once, or to spread it over twelve months? Historical data gives a somewhat surprising answer.
What Are Lump-Sum and Recurring Investing?
Lump-Sum investing is putting a lump sum you already have to work all at once. Recurring investing (Dollar-Cost Averaging, DCA) is splitting that lump sum into several installments (e.g., 12 months).
Note that the recurring investing meant here is not 'steadily adding money you newly earn each month,' but 'deliberately splitting up a lump sum you already have and adding it slowly.' The habit of adding part of your monthly paycheck is a separate story; what is compared here is 'when to fully deploy the lump sum currently in your hands.'
Vanguard's Research: Lump-Sum Won About 2/3 of the Time
In a 2012 report titled 'Dollar-Cost Averaging Just Means Taking Risk Later,' Vanguard analyzed long periods (1926–2011, over 1,000 overlapping 10-year windows) in the U.S., U.K., and Australian markets.
The result was that lump-sum beat recurring investing about 2/3 of the time (roughly 66–68%). In a balanced portfolio like 60% stocks / 40% bonds, lump-sum's average outperformance was tallied at roughly 1.5–2.4%p. An updated 2023 study maintained a similar conclusion.
The figures are approximate ranges cross-checked from Vanguard's original data and several secondary tallies. The '2/3' and 'average 1.5–2.4%p' shift slightly depending on the markets, periods, and asset weights used. These are past statistics and do not guarantee the future.
Why Lump-Sum Had the Edge
The reason is simple. Over the long run, the market has had more up days than down days.
The earlier you put money in, the longer that money stays in the market, and the more time it has to compound. Recurring investing, by contrast, means holding part of the lump sum in cash and waiting, so if the market rises in the meantime, you miss that gain. This is why Vanguard titled its report 'Dollar-Cost Averaging Just Means Taking Risk Later.' As long as the market generally rises, deferring risk also means deferring the chance at returns.
Still, Moments When Recurring Investing Shines
Even though the statistics favor lump-sum, recurring investing has an advantage that numbers do not capture: defense against regret and drawdowns.
If the market falls sharply the very month after you put a lump sum in all at once (e.g., 2008, early 2020), that shock and regret are hard to bear. Recurring investing reduces the risk of deploying your entire wealth at the worst timing, helping you keep investing with peace of mind.
In the end, 'the method that is favorable on average' and 'the method I can stick with to the end' can be different. The best strategy is the one you can endure—one that keeps you from getting scared and selling partway through.
This article does not recommend a particular method but explains the statistical and psychological characteristics of the two approaches. Neither eliminates losses, and it is a matter to choose according to your own temperament and the drawdown you can bear.
Frequently Asked Questions
Q. If lump-sum is favorable, should I always put it in all at once?
That is what the average shows statistically; it does not guarantee individual cases. If a big drop comes right after you put it in all at once, you take the loss all at once too. You should weigh both the 'average expected performance' and the 'risk you can withstand,' and the most important thing is to hold on without selling partway through.
Q. Is investing steadily from my monthly paycheck also recurring investing?
That is 'continuously investing money you newly earn,' which is effectively close to putting it in lump-sum each time. The recurring investing compared in this article is the case of 'deliberately splitting up a lump sum you already have.' Distinguishing the two prevents confusion.
📋 Results are based on historical data; past returns do not guarantee future returns.
📋 This service is provided for educational purposes to help you understand investing, not as investment advice.