As an investment strategy, putting $12,000 into a mutual fund today versus spreading that $12,000 over the course of twelve months (or $1,000 per month) is statistically not such a smart move… well, unless of course you invest $12,000 per month or at some kind of regular interval. This has nothing to do with the mutual fund in question. Instead, investing regularly has its share of perks, in fact enough of them that investors would be silly not to take advantage of them from Day 1.

To illustrate just how powerful regular investments can be versus single, lump-sum investments, consider that even if a security value drops, you can still come out with a gain if you make your investment purchases on a regular basis.

To add credibility to our little illustration, we will look at S&P 500 values for 2009. Our first investor will invest $12,000 on the first business day of January while our second will invest $1,000 every month on the first business day of that month. By December 2nd, they will have both invested at total of $12,000.

As we can see from the chart below, the investor who invests every penny at once will be ahead by 19% on December while the investor who puts $1,000 aside every month is only marginally ahead of that investor at 20.57%. The difference of $200.10 hardly seems worth it in the end… or does it? Putting yourself in the shoes of the two investors might tell us a different story as we work our way from month to month.

Take look at the Investor #1 who goes “all-in” on January 2, 2009. How would this investor feel one month later on the first business day of February when that $12,000 investment is down 11.41%, a loss of nearly three thousand dollars. Would Investor #1 be getting sick to her stomach on the first business day of March when that investment is down 24.79% or a heart-stopping $2,974.63?

In comparison, after that first business day purchase in March 2009, Investor #2 would have put $3,000 away and lost just 13.3% or $398.86. In absolute terms, Investor #2 would probably feel a lot better than Investor #1 at this point. And any sinking feeling of loss would be gone for the rest of the year for Investor #2 by the time the first business day in April rolls around and he see his investments roughly at a break-even point (a 0.26% gain actually) while Investor #1 is still not eating or sleeping because they are still down nearly 13% or $1,554.67.

In fact, while Investor #2 watches his investment gain throughout the rest of the year (except in July, when they slip from being “up” 12.27% in June down to being “up” only 8.53% in July), Investor #1 has to wait two extra months before they break even again… and that victory is really short-lived because in July they will have seen their investment swing back into the red again. Talk about an emotional roller-coaster ride for Investor #1 — while Investor #2 recorded just 2 “down” periods for the year Investor #1 was in the red for 5 of the 12 periods, a little more than 40% of the time!

And what if either Investor had lost part or all of their regular income and needed to draw on their investment after 3 months? At that point, only Investor #2 showed a gain of any type meaning Investor #1 would have been cashing in at the absolute worst time possible.

Of course, in the end, Investor #2 actually ends up being $200.10 ahead of Investor #1, thanks entirely to their regular contributions allowing them to purchase more units. After understanding the probable emotional turbulence that Investor #1 experiences, the extra $200.10 seems like only a single piece of what is really much-larger bonuses — these being the reduced stress levels, the added units and the lower dollar-value losses when things turn South.

This is not magic. You can run the figures yourself using S&P 500 closing prices found at Yahoo! Finance. But remember: investing regularly in mutual funds really can make a big difference.

Illustration A (S&P 500 values; Invest One-Time vs. Invest Monthly)

Illustration A

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