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Is the S&P 500 All You Need to Retire a Millionaire?

By Selena Maranjian - Apr 23, 2021 at 9:18AM

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You might be surprised at how long it can take you to become a millionaire with this index of stocks.

There are lots of ways to achieve millionaire status, but many of them are difficult. For example, you could buy lots of lottery tickets and hope for the best, but you'll likely end up in worse financial shape, not better. Or you could start a terrific business in your garage and watch it become worth $1 billion or more over time, perhaps selling it for many millions along the way.

For many of us, a much better path to a retiring a millionaire is simply socking money into an S&P 500 index fund regularly for a long enough period. Depending on how far from retirement you are, the S&P 500 could be all you need to retire a millionaire.

A butler in a tux is holding a platter filled with money.

Image source: Getty Images.

What's the S&P 500?

So what, exactly, is the S&P 500? It's an index of the stock of 500 of America's biggest companies -- which, together, represent about 80% of the value of the entire U.S. stock market. It's also widely used as a proxy for the entire market, not unlike the Dow Jones Industrial Average, with news reports regularly referencing its performance from day to day and year to year.

The components of the index change every few years or so, due to some companies faltering and ending up too small to qualify, some companies merging or being spun off, and so on. Its ranks today include Apple, Amazon, Broadcom, Coca-Cola, CVS Health, Walt Disney, FedEx, Goldman Sachs, Nike, Oracle, Sherwin-Williams, Visa, Walmart, and Zebra Technologies.

Can the S&P 500 make you a millionaire?

Whether the S&P 500 can make you a millionaire depends on how rapidly it grows over time and how long you have to invest in it. Over many years, the average annual gain of the S&P 500 has been close to 10% -- though it might average significantly more or less during the specific years in which you invest.

Here's how you might approach $1 million investing $10,000 annually, if the money grows at, say, 5%, 10%, and 15%:

Growing for

Growing at 5%

Growing at 10%

Growing at 15%

10 years

$132,068

$175,312

$233,493

15 years

$226,575

$349,497

$547,175

20 years

$347,193

$630,025

$1.2 million

25 years

$501,135

$1.1 million

$2.4 million

30 years

$697,608

$1.8 million

$5.0 million

35 years

$948,363

$3.0 million

$10.1 million

40 years

$1.3 million

$4.9 million

$20.5 million

Data source: Calculations  by author.

The table below uses a somewhat conservative average annual growth rate of 8% and shows how you can amass $1 million if you invest various sums regularly:

Growing at 8% for

$5,000 Invested Annually

$10,000 Invested Annually

$15,000 Invested Annually

5 years

$31,680

$63,359

$95,039

10 years

$78,227

$156,455

$234,682

15 years

$146,621

$293,243

$439,864

20 years

$247,115

$494,229

$741,344

25 years

$394,772

$789,544

$1,184,316

30 years

$611,729

$1,223,459

$1,835,188

35 years

$930,511

$1,861,021

$2,791,532

40 years

$1,398,905

$2,797,810

$4,196,716

Data source: Calculations by author. 

Clearly, investing in the S&P 500 can make you a millionaire. You just need to have enough time to get there, and you'll get there faster if you can sock away fatter sums and/or if you luck out and enjoy a high average annual growth rate.

How to invest in the S&P 500

Here are three exchange-traded funds (ETFs) -- which are essentially funds that trade like stocks -- that are low-cost index funds. Each represents a quick and easy way to be invested in the S&P 500 or even broader indexes.

  • SPDR S&P 500 ETF ( SPY 2.07% )
  • Vanguard Total Stock Market ETF ( VTI 2.14% )
  • Vanguard Total World Stock ETF ( VT 2.07% )

Respectively, they'll have you instantly invested in 80% of the U.S. stock market, the entire U.S. market, or just about all of the world's stock market. There are plenty of other good low-cost index funds, some of which target bonds and other segments of the market.

So if you want to build meaningful wealth over time and don't have the skills or interest in studying and choosing individual stocks, park your money in one or more index funds and keep adding to it over many years.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis – even one of our own – helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.

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