Lump Sum vs. Dollar-Cost Averaging: Invest Now or Gradually?

Last updated: 10. november 2026

You’ve received a large sum of money—perhaps from the sale of a home, an inheritance, a bonus, or savings—that you now want to put to work for you in the market. This quickly raises a practical question: Should you invest the entire amount at once, or split it up and invest a little at a time over a period of time?

In this article, we’ll assume that you’ve already decided which portfolio to put the money into—for example, a well-diversified portfolio of equity and fixed-income funds with a risk level that suits you. The question here, then, is not how much you should have in stocks, but how you should enter the portfolio you’ve chosen: with the entire amount at once, or gradually over time.

This article explains what these two approaches entail, what the historical data shows and why, what happens if you invest at an inopportune time, and what factors may be relevant when making your own assessment.

Read more about the principles behind Connectum’s investment philosophy

What is the difference between a lump-sum investment and a phased investment?

With a lump-sum investment, the entire amount is invested in the portfolio at once. With gradual phasing in, the amount is divided and invested in equal parts over a set period, while the portion that has not yet been invested remains in the account.

If you have 1,000,000 kroner, a lump-sum investment means the entire amount is placed in the portfolio today. Gradual phasing in could, for example, mean that the amount is divided into twelve monthly deposits of approximately 83,300 kroner. In the meantime, the money that is on hold earns bank interest rate. In English, these two approaches are often referred to as “lump-sum investing” and “dollar/pound-cost averaging.”

Gradual phasing-in is not the same as regular monthly savings from your salary. When you save from your salary, you invest the money as you receive it. With gradual phasing-in, you already have the entire amount and actively choose to keep a portion of it out of the portfolio for a period of time.

The reasoning behind gradual phasing in is understandable: you buy more shares when prices are low and fewer when they’re high, and you avoid the feeling of having “bought at the top” right before a decline. Historical data, however, paints a different picture of which approach has most often yielded the best returns.

Which has historically given the best returns—a lump-sum investment or gradual phasing in?

Historically, a lump-sum investment has yielded higher returns than gradual investment in about two out of three periods, across markets and time frames. In the remaining third, gradual investment would have yielded the best results.

The most frequently cited study in this area comes from Vanguard, which compared the two approaches in the U.S., the U.K., and Australia, among other countries, over rolling ten-year periods. A 2023 Vanguard study measured returns after one year, with investments phased in over three to six months. A lump-sum investment yielded the highest returns in between 62 and 74 percent of cases, depending on the market and the phasing-in period. For a global equity portfolio (MSCI World, 1976–2022), the proportion was 68 percent.

The Canadian asset management firm PWL Capital conducted a similar analysis of six major stock markets, with very similar results:

Source: PWL Capital (2020), rolling ten-year periods. Even in Japan, which has experienced weak performance since 1990, a one-time investment yielded the highest return in more than half of the periods.

How big is the difference?

PWL found that gradual phasing in, on average, resulted in an annual return that was 0.38 percentage points lower over the ten-year periods. Vanguard’s 2023 study found that, in the median scenario, a pure equity portfolio was worth about 2.2 percent more after one year with a lump-sum investment than with a phased investment over three months. For portfolios with 60 percent and 40 percent stocks, respectively, the difference was 1.8 percent and 1.2 percent. The difference is moderate in any given year but can become noticeable over time and with large amounts.

If you phase in 1,000,000 kroner over twelve months, on average about half of the amount remains outside the portfolio throughout the year. If, for example, the market rises by 9–10 percent that year, you’ll miss out on a significant portion of the gains on the money that’s still waiting to be invested.

Why have lump-sum investments typically given higher returns?

The main reason is that, over time, the stock market has risen more often than it has fallen. Money that remains outside the portfolio therefore generally misses out on returns it could otherwise have earned.

Over time, stocks are expected to provide higher returns than bank deposits, as compensation for the risk the investor takes. This excess return is called the stock market’s risk premium, and historically it has been positive over most extended periods. Every month that a portion of the amount remains in the account is therefore a month during which that portion is not exposed to this expected excess return.

A lump-sum investment puts the entire amount to work immediately, while gradual phasing in keeps a progressively smaller portion out of the market throughout the phasing-in period. It is this difference in time spent in the market that explains why lump-sum investments have, on average, performed better. The same logic applies to a portfolio containing both stocks and fixed-income securities, but the difference between the two approaches will normally be smaller the lower the equity allocation is, because the expected excess return relative to bank deposits is then lower.

What if you invest at a bad time?

It can happen, and during such periods, gradual phasing in would have yielded a better result. Historical data nevertheless show that lump-sum investments have, on average, performed better even in situations that initially appeared risky, such as after sharp declines and when prices have been high.

Average figures are little consolation on the day the market plunges right after you’ve invested, so the concern is real. That’s why it’s useful to look at what has happened in situations where many people would be most reluctant to invest everything at once.

After a Sharp Drop

PWL Capital compared the two approaches during periods immediately after the market had already fallen by 20 percent or more. Even then, a lump-sum investment yielded the highest return in just over half of the cases (54 percent on average across markets), and an average of 0.25 percentage points higher annual return over the following ten years. The advantage was thus smaller than usual, and gradual phasing in performed best in nearly half of the cases.

The explanation is that a sharp decline is sometimes followed by further declines and other times by a rebound. In the data, the rebounds have, on average, carried more weight. Gradual phasing in performs best when the decline continues for a considerable time, but it is not possible to know this in advance.

When Prices Seem High

PWL also examined periods when the U.S. market was among the top 5 percent most expensive as measured by the Shiller-CAPE ratio. Even then, a lump-sum investment yielded the highest returns in about 64 percent of the periods. Markets that appear expensive can become even more expensive, and in this data, on average, it has been less profitable to wait than to invest.

Japan in the late 1980s illustrates how far a market can fall after a period of very high prices. According to PWL, however, a one-time investment outperformed gradual phasing-in over the following ten years, even when investing in November 1988. The risk that a single market will underperform over the long term is therefore better managed through broad diversification—for example, in a global portfolio—than through gradual phasing in.

When might gradual phasing-in make sense?

Gradual phasing in can make sense when it makes it easier for you to get started and to stick to your plan if the market falls shortly after you’ve invested. The value lies primarily in how this approach influences your decisions along the way, not in expected returns.

Losses and Regrets Are Experienced Differently

Research in behavioral economics has shown that losses are typically felt more strongly than gains of the same magnitude (Kahneman and Tversky, 1979). Studies also suggest that many people experience stronger regret over a poor outcome resulting from taking action than over a similar outcome resulting from inaction (Kahneman and Tversky, 1982).

Investing 1,000,000 kroner today and seeing the value fall to 900,000 kroner the following month can therefore feel worse than refraining from investing and seeing the market rise by the same amount, even though the financial outcome is comparable. Statman (1995) points to precisely to this type of regret as an explanation for why many people prefer gradual phasing in, even though it does not yield the highest expected return. By spreading purchases over time, the risk of regret is also spread out.

What matters is that the plan is executed

A sharp decline shortly after a lump-sum investment can cause some people to lose heart and sell at an inopportune time. The result can then be far weaker than if the plan—whether it was a lump-sum investment or gradual phasing in—had been followed. If phased investment makes it easier for you to stay invested through such a decline, it can offset the lower expected return.

The same applies to the risk of sitting on the sidelines. Those who wait for “the right time” may end up with their money sitting in an account for a long time. Compared to that, a gradual phased-in approach that is actually carried out according to plan will normally yield a better expected result. The cost of a gradual phased-in approach can thus be seen as the price you pay for a strategy you’re confident you can carry out.

What should you consider before making a decision?

The most important thing is how you yourself would react if the market were to fall shortly after you’ve invested, and whether the portfolio you’re planning to invest in carries a level of risk that’s right for you. It can be helpful to think through the following:

1. How would you react to a decline? Think about how you would handle a decline of, say, 10–20 percent right after the entire amount has been invested. If you’re unsure whether you’d stick to the plan, gradual phasing in may be worth considering.

2. Is the portfolio’s risk level right for you? If the idea of investing the entire amount feels unbearable, it may be a sign that the portfolio is too risky for you. If this is a risk you can only manage by entering it gradually, it may be worth taking a closer look. In that case, a more conservative allocation between stocks and fixed-income securities might be a better solution than gradually phasing into a portfolio with too high a risk.

3. When will you need the money? The choice between the two approaches assumes that the money will be invested over the long term. Funds you’ll need within a few years generally don’t belong in an equity-heavy portfolio, regardless of how they’re phased in.

4. The interest rate on cash. When interest rates are high, it costs less to let the money sit, because it earns more in the meantime. Vanguard finds that the advantage of a lump-sum investment decreases as the interest rate on cash increases. The effect is still small compared to the expected difference in returns.

5. The length of the phasing-in period. The longer the phasing-in period, the more of the amount remains outside the portfolio, and the greater the expected cost. If you choose a gradual phasing-in, it may be advantageous to determine the period and amount in advance, so that the plan does not depend on how the market performs along the way.

This is general information and not personal advice. Your specific situation—such as your time horizon, other assets, tax situation, and how you handle market fluctuations—determines what is right for you. For larger amounts, it may be helpful to discuss your options with a financial advisor.

Read also about how others have experienced working with Connectum, and the importance structure, security, and a long-term plan have had for them, in our customer stories

Lump-Sum Investment or Gradual Phasing In—A Brief Summary

• Historically, a one-time investment has yielded higher returns in about two out of three periods—even after major market declines and when prices have been high—but not in all periods.

• The main reason is that money sitting outside the portfolio misses out on expected returns. The difference is moderate on average, but can become noticeable over time.

• Gradual investment yields a lower expected return, but can make it easier to get started and stick to your plan if the market drops shortly after you’ve invested.

• What’s right for you depends, among other things, on how you’ll react to a market decline, whether the portfolio’s risk level is right for you, and when you’ll need the money.

The choice, therefore, involves balancing expected returns with how you yourself will handle fluctuations along the way. What matters most over time is having a portfolio with a risk level that suits you and staying invested.

Sources

• Vanguard Research (2023): “Cost Averaging: Invest Now or Temporarily Hold Your Cash?” – corporate.vanguard.com
• Shtekhman, Tasopoulos & Wimmer / Vanguard (2012): “Dollar-cost averaging just means taking risk later.”
• Benjamin Felix / PWL Capital (2020): “Dollar Cost Averaging vs. Lump Sum Investing.” (Methodology and figures adapted and translated.)
• Constantinides, G. (1979): “A Note on the Suboptimality of Dollar-Cost Averaging as an Investment Policy,” Journal of Financial and Quantitative Analysis.
• Kahneman, D. & Tversky, A. (1979): “Prospect Theory: An Analysis of Decision under Risk,” Econometrica, 47(2), 263–291.
• Kahneman, D. & Tversky, A. (1982): “The Psychology of Preferences,” Scientific American, 246(1), 160–173.
• Statman, M. (1995): “A Behavioral Framework for Dollar-Cost Averaging,” Journal of Portfolio Management, 22(1), 70–78.
• Historical return data: MSCI (msci.com), S&P Dow Jones Indices, Macrotrends.