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Dollar-Cost Averaging Vs. Lump-Sum Investing: Which Is Better?

If you have money to invest, you need to decide if you want to space it out or put it all into an investment now. Read my dollar-cost averaging vs. lump-sum investing breakdown right here.
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When you come into, or have, a lump sum of cash, do you think about investing it? If you don’t – you really should. But there are different strategies you can employ with a large sum of money. You could spread it out over time, or dump it all into the stock market right away.

But which method is best?

In this article, I will review the difference between dollar-cost averaging (DCA) and lump-sum investing so you can determine which is best for you.

What is the difference between dollar-cost averaging and lump sum investing?

Dollar-Cost Averaging Vs. Lump-Sum Investing: Which Is Better? - What is the difference between dollar-cost averaging and lump sum investing?

The main difference between dollar-cost averaging and lump sum investing is when you invest in the stock market. With dollar-cost averaging, you invest small amounts of your money at certain intervals over the course of time. Lump-sum investing, on the other hand, is when you take all of the money you have available to invest at that moment, and invest it all at once.

I’ll discuss these in a little more detail below.

A brief description of dollar-cost averaging

Investing your money at regular intervals – such as weekly, monthly, or quarterly – in things like stocks and ETFs is considered dollar-cost averaging (often referred to as DCA). Most of us have set up a 401(k) contribution at our jobs, and money is automatically taken out of our paychecks and invested in a variety of funds. If you’ve done that, you’ve used dollar-cost averaging.

While that is the most common method of dollar-cost averaging, you can take another route with dollar-cost averaging. If you have a lump sum of cash in a savings account, for example, you can elect to spread that money out over a certain period of time and invest it gradually. For example, if you had $20,000 in savings, you could spread that out over the course of 12 months (evenly) instead of investing it all at once.

The major draw to this strategy is that you aren’t putting every dollar you have into the stock market at once and taking the risk that the market will suddenly drop, and so will your portfolio’s value. Since past performance is nothing more than a piece of data and no one can predict future returns, dollar-cost averaging helps you mentally invest your money into riskier investments (like stocks) without “feeling” the risk as much.

A brief description of lump-sum investing

Lump-sum investing, on the other hand, is when you take all of your available dollars to invest and put it right into the stock market. It’s the opposite of dollar-cost averaging, so you don’t wait to invest – it all goes into your chosen investments right away. Now, there is somewhat of a fine line between DCA and lump-sum investing. Let me explain.

If you’re intentionally holding on to cash to invest it later, I would chalk it up as dollar-cost averaging. But you can still make periodic investments and consider it a lump sum investment. For example, say you get a quarterly bonus for $10,000. Every time you get that bonus, you decide to invest it. This is still lump-sum investing, even though you’re making periodic investments. The reason is that you’re not intentionally holding onto the money for a later time.

If you were to instead take the $10,000 quarterly bonus and spread it out over the coming quarter, in three equal monthly installments, THAT would be dollar-cost averaging. It might seem like semantics, but when you look at the data, the difference can actually mean more or less money in your portfolio (more on this below).

Who is dollar-cost averaging for and not for?

Dollar-Cost Averaging Vs. Lump-Sum Investing: Which Is Better? - Who is dollar-cost averaging for and not for?

Dollar-cost averaging works really well for nervous investors with lower risk tolerance and who have larger sums of money sitting around in something like a high-yield savings account. You can minimize your risk by spreading out your investment into smaller chunks, while still keeping cash in a safer investment, such as a CD.

You’ll also benefit from dollar-cost averaging if you can spread your investment out for a longer period of time. If you invest your money too quickly (for example, over three to six months), you may not give the market enough time to correct itself after a big upswing or downswing. 

Coronavirus is a great example, as things have been volatile and you won’t get the most value from your DCA approach if you invest it too fast. I recommend spacing it out over 12 to 36 months if you’re taking this approach. Also, I recommend setting it up as an automated investment plan so you don’t bail out on your contributions by doing it manually.

On the flipside, DCA isn’t for those who want to invest faster, are okay with the ups and downs of the market, and don’t like keeping extra cash in lower-yield vehicles like CDs or bonds.

Who is lump-sum investing for and not for?

Lump-sum investing is a strategy that requires a high level of risk tolerance. It’s taking a gamble. If you have $20,000 to invest, a lump sum investing strategy would tell you to dump all of that money into your investments at once. By doing that, you run the risk that the stock market can tank immediately (just like what happened in March due to the coronavirus pandemic). Alternatively, it can go upward and you win out – hence the reason it’s a gamble.

So if you have money to invest and you’re okay with the idea that you could lose that money, and you’re willing to take that risk, then lump-sum investing is a great option for you. While there is an inherent risk, there’s also the possibility of huge gains. Imagine if you’d invested $20,000 right after the stock market tanked this past March. You’d have enjoyed the ride of a significant market rebound thus far.

Likewise, if you’re uncomfortable with the risk of losing your investment, or if you want to have some extra cash set aside for emergencies instead of it being invested, lump-sum investing probably isn’t for you. Even if you could bring yourself to make the investment, people who are internally uncomfortable with it will experience anxiety and make emotionally-based trading decisions – which is never good.

Does it matter which one you choose?

Yes and no. No, it doesn’t matter from a personal and psychological perspective, but YES it does matter from a data and mathematical perspective. Here’s what I mean:

I like to equate this argument to Dave Ramsey‘s argument: the Debt Snowball. Mathematically, the Debt Snowball makes no sense. Ramsey suggests paying off your smallest balance first, then the next biggest one, and so on. This approach ignores interest rates, so you’re not necessarily taking the most logical approach – but it works on a psychological level.

That, to me, is where dollar-cost averaging wins out over lump-sum investing. Mathematically, it doesn’t necessarily make sense (I’ll tell you why in a moment), but it brings a level of psychological safety to your investment strategy by allowing you to keep cash on hand in case of an emergency AND invest some money along the way.

What the studies show

Just like any investment strategy that aims to reduce risk (like investing in bonds, for example), dollar-cost averaging has downsides. Put simply, a dollar-cost averaging investor will miss out on massive swings in the market because they’re keeping their money aside for the next cadenced deposit toward that investment. By the time the money is ready to be invested, the market may have already corrected itself and you’ve missed out on the gain.

One study done by two professors of finance in the early 90s, looked at historical stock market data, spanning around 70 years. Their findings showed that around 67% of the time, someone who invests a lump sum gained higher returns in their first year than someone who followed dollar-cost averaging and drip-fed their investment over the course of the year.

Another study that was done more recently by Vanguard, looked at the difference between dollar-cost and averaging and lump sum investing by investing in a 60/40 (stock/bond) portfolio in three different countries. They found that in each market, a lump-sum investment led to greater portfolio values approximately two-thirds of the time. They did variations of this test and saw very similar results, too.

Finally, a study done by Robert Atra and Thomas Mann in 2001 in the Journal of Financial Planning states that “The results (of various studies) suggest that DCA is neither as effective as the personal finance literature claims, nor as suboptimal as the academic literature claims.” 

What they’re saying is that dollar-cost averaging, from a statistical perspective, isn’t all it’s cracked up to be. It provides some level of safety, but at the cost of increased returns.

Regardless of the method you choose, pick a good broker

Dollar-Cost Averaging Vs. Lump-Sum Investing: Which Is Better? - Regardless of the method you choose, pick a good broker

Whether you choose to use dollar-cost averaging or lump sum investing is up to you. But regardless of the method you choose, you need to make sure you have a good online broker you’re working with. Here are couple of my favorites right now:

J.P. Morgan Self-Directed Investing

J.P. Morgan Self-Directed Investing gives you an option to invest on your own, or with J.P. Morgan Automated Investing – which will give you a managed portfolio for a low fee of 0.35% per year. Both account types come with easy account management, best-in-class expertise from J.P. Morgan Chase, and integration with a variety of Chase features.

When it comes to dollar-cost averaging, you can use either account type. J. P. Morgan Self-Directed Investing will allow you to pick your own stocks and invest over time without paying commissions. J.P. Morgan Automated Investing, on the other hand, will let you build a managed portfolio that you can drip money into on a periodic basis.

For lump-sum investment, J.P. Morgan Self-Directed Investing is great since you won’t have to pay commissions on your larger trade.

» Open a J.P. Morgan Self-Directed Investing account.


E*TRADE is far and away one of, if not the, best investment platforms you can be on. They blow most other online brokers away with the number of tools and resources they have, the advanced investment charts you can leverage, and their unique account features. They aren’t the cheapest, but if you’re a serious long-term investor, give E*TRADE a look.

What’s great about E*TRADE for dollar-cost averaging is the fact they have E*TRADE, where you can get a checking or savings account. So not only can you space out your investments, but you can keep the cash in a high-yield savings account while you wait to invest it – all with one broker. And for lump-sum investing, things like the Technical Pattern Recognition Tool and Spectral Analysis will help you make the right investment the first time.

» Check out our E*TRADE vs. TD Ameritrade comparison.


So while the data suggest that lump-sum investing is a better strategy in the long-run, it doesn’t necessarily mean it is going to be the best strategy for you. Investing is emotional – and as long as you keep those emotions in check and avoid making rash decisions, you should be fine.

But part of that emotion is feeling secure in what you’re investing in – which is when DCA might prove valuable for you. Either way, make sure you know the differences and find a broker that will work for what you need.

About the author

Chris Muller

Chris has an MBA with a focus in advanced investments and has been writing about all things personal finance since 2015. He’s also built and run a digital marketing agency, focusing on content marketing, copywriting, and SEO, since 2016.