If You Invest Just $50 per Month in the Stock Market, Here’s What History Says It Could Be Worth in 20 Years

If you’re looking to build a hefty nest egg and you’d like to do it by investing in stocks, that’s a fine idea, and an achievable goal, as well. Many, including Warren Buffett, would recommend doing so via a low-fee index fund that tracks the S&P 500 Index (^GSPC +0.42%). One such well-regarded fund is the Vanguard S&P 500 ETF (VOO +0.40%). (It’s an exchange-traded fund, or ETF, by the way — a fund that trades like a stock.)

Image source: Getty Images.

How might your money grow over time if you invest in this Vanguard ETF? Well, no one can know for sure, but a look at how it has performed in the past could help you make an informed estimate:

Data source: Morningstar.com, as of Oct. 1, 2026.

Looking at the table above, you might think that a 15% average annual growth rate seems reasonable, but know that the S&P 500 has averaged annual returns closer to 10% (ignoring inflation) over many decades. I might even use a lower average annual gain, considering how much the stock market has run up in recent years — after all, a stock market crash or correction is not out of the question in the coming year or two.

So check out the table below, which shows how your money might grow at several different growth rates if you invest just $50 per month (or $600 per year).

Data source: Calculations via Investor.gov’s calculator.

Of course, the more you can invest and the longer you can remain invested, the more money you can amass.