Dollar-Cost Averaging Statistics (2026)

If you have a chunk of money to invest, the historical odds favor putting it all in at once. Across the major studies, lump sum investing (LSI) has beaten dollar-cost averaging (DCA) roughly two-thirds of the time, and by a meaningful margin (see the table below).

Vanguard, Northwestern Mutual, and PWL Capital all reach the same conclusion using different markets and decades. The reason is simple: markets rise more often than they fall, so cash waiting on the sidelines usually misses gains it could have captured.

Dollar-cost averaging means investing a fixed amount at regular intervals rather than all at once, for example splitting a $100,000 windfall into twelve monthly $8,333 buys. It lowers the risk of investing everything right before a drop, at the cost of leaving money idle in the meantime.

It is worth separating two things people call DCA. Feeding a windfall in slowly is the version these studies test. Contributing part of each paycheck to a 401(k) is also called DCA, but that is simply investing money as you earn it, which is a different decision entirely.

The win rate for lump sum clusters around two-thirds across studies. Vanguard's 2012 work put it at 67% in the US, its 2023 update at roughly 62% to 74% across global markets, and PWL Capital at about 66% (see the chart below).

Northwestern Mutual found even higher rates: 75% for an all-stock portfolio, rising to 80% for a 60/40 mix and 90% for all bonds. The safer the assets, the more reliably lump sum wins, because bonds and cash have less downside for DCA to sidestep.

Winning most of the time also means winning by a decent margin. Vanguard's 2012 study found the lump sum portfolio ended up 2.3% larger on average over a 12-month averaging window, and its 2023 study put the median edge at 2.2% for stocks, 1.8% for a 60/40 mix, and 1.2% for 40/60 (see the chart below).

On a $100,000 investment, Vanguard found that averaging in over three months left an investor with about $504 less than going all in, and stretching it to six months cost about $1,491. Those gaps compound over a lifetime of investing.

The foundational research is Vanguard's 2012 paper, bluntly titled "Dollar-cost averaging just means taking risk later." It examined rolling 10-year periods in the US from 1926 to 2011 using a 12-month DCA window, and found lump sum beat DCA 67% of the time, with the result virtually identical in the UK and Australia.

Its sharpest finding was about patience gone wrong: extending the averaging window from 12 to 36 months pushed the lump sum win rate from 67% all the way to 90%. Vanguard's recommendation was that anyone who insists on averaging in should keep the window to no more than a year.

Vanguard revisited the question in February 2023 with "Cost averaging: Invest now or temporarily hold your cash?", using the MSCI World Index from 1976 to 2022 and a $100,000 starting sum across three allocations. It confirmed lump sum led more than two-thirds of the time (see the table below).

The 2023 paper is useful because it quantifies the tails. In the best 5% of outcomes, lump sum led by 6.4% (all stocks); in the worst 5%, DCA led by 3.6%. That asymmetry is the whole trade: you give up a likely edge to buy a smaller cushion in the rare bad case.

Northwestern Mutual ran a parallel analysis on $1 million invested over rolling 10-year periods, with DCA spread evenly across 12 months and then held. Lump sum won 75% of the time for stocks, 80% for a 60/40 mix, and 90% for all fixed income (see the table below).

The magnitudes are striking because they compound over a decade: the average all-equity outperformance was 15.23% cumulatively, 10.68% for 60/40, and 4.3% for bonds. As one of its portfolio managers put it, the probability of ending with more money overwhelmingly favors going all in.

The single clearest pattern across the research is that time out of the market is the enemy. Every extra month cash sits uninvested is a month it earns roughly nothing while stocks, on average, rise (see the table below).

That is why a three-year averaging plan loses to lump sum 90% of the time in Vanguard's data, versus 67% for a one-year plan. If you are going to average in at all, the evidence says do it fast: weeks or a few months, not years.

DCA is not always wrong; it wins in exactly the scenarios people fear. In the worst 5% of Vanguard's 2023 outcomes, averaging in beat lump sum by 3.6% for an all-stock portfolio, 1.4% for 60/40, and 0.6% for 40/60 (see the chart below).

Historically DCA has outperformed at the onset of major declines: the years it won in one FPA study were 2000, 2001, 2002, and 2008, all bear markets. The catch is you cannot know in advance which years those will be, which is why the average result still favors lump sum.

The cleanest way to frame DCA is as a risk-reduction tool that costs return. A Cho and Kuvvet study in the Journal of Financial Planning, covering S&P 500 rolling one-year periods, found DCA cut the average return by about 1.40% while also reducing volatility by 2.21% (see the table below).

In that data DCA won only 5 of 20 years, and four of those five were bear markets. So DCA does deliver a smoother ride, but you pay for it: it trims the average outcome in exchange for a narrower range of outcomes, good and bad alike.

The strongest argument for DCA is not mathematical but psychological. Meir Statman's 1995 analysis identified four reasons people favor it: prospect theory, aversion to responsibility and regret, cognitive errors from recent price trends, and a lack of self-control.

By committing to a rule (invest 1/12 each month regardless of price), an investor feels less personally responsible for any single bad entry point, which reduces regret. If spreading purchases out is what keeps someone from panic-selling or never investing at all, the modest return cost can be worth it.

Both strategies share a common opponent, and it is doing nothing. Vanguard's 2023 study found lump sum beat holding cash about 70% of the time and DCA beat cash about 69%, so either approach is vastly better than staying on the sidelines (see the table below).

That reframes the debate. The lump-sum-versus-DCA gap is a couple of percentage points; the gap between investing and not investing can be the whole return. Deciding to invest at all is the decision that matters most.

For the majority of investors the question is moot, because they are already averaging in by default. Every 401(k) contribution deducted from a paycheck buys shares at whatever the price is that pay period, which is textbook dollar-cost averaging without any decision required.

That is the right way to invest money you have not earned yet: you invest it as it arrives. The lump-sum debate only applies to money you already hold in cash, such as a bonus, inheritance, or the proceeds of a sale.

If you have cash to invest and a long time horizon, the historical odds say invest it now rather than in slices. Lump sum has won about two-thirds of the time and by roughly 1% to 2% on average, and the edge grows the longer you would otherwise wait.

But the best plan is the one you will actually stick to. If a lump sum would keep you awake or tempt you to bail after a dip, averaging in over a few months (not years) is a reasonable compromise, and building a diversified basket to fund on a schedule turns the whole question into an automatic habit.