Geoffrey Seiler, The Motley Fool

Sun, Jun 29, 2025, 7:05 AM6 min read

• Consistent dollar-cost averaging is the best investment strategy to retire a multi-millionaire.

• Monthly investments of as little as $500 can turn into millions of dollars when you are set to retire.

• There are a number of ETFs that can help you get the necessary returns to become a multi-millionaire.

• 10 stocks we like better than Vanguard S&P 500 ETF ›

The secret to retiring a multi-millionaire is quite simple. There is no easier way to accomplish this than by using a consistent dollar-cost averaging strategy. If you start investing early and use this investment strategy, your odds of retiring a multi-millionaire are extremely good.

Dollar-cost averaging is one of the simplest and most effective investing strategies out there. Instead of trying to time the market, you simply invest at regular intervals, regardless of where prices are.

By investing a fixed amount every month, or every paycheck, you'll buy more shares when prices are low and fewer shares when they're high. Over time, this will smooth out your cost basis and help protect you from big market swings. It's a disciplined approach that will keep you investing through both bull and bear markets.

Some of the best investment vehicles to use this strategy with are exchange-traded funds (ETFs). With ETFs, you can get an instant portfolio of stocks without doing a lot of research. ETFs are also very accessible. You can feel comfortable starting with a small amount -- the key is just investing consistently.

With the power of compounding, dollar-cost averaging consistently into an ETF can help you retire a multi-millionaire. You also don't have to start with a large amount. If you are in your mid-twenties and have 40 years until retirement, a simple $500 investment each month can turn into a nearly $5 million nest egg by the time you hit retirement age with just a 12% average annual return.

If you're older, though, don't fret. A $1,000 investment each month at a 12% annual return can give you a $3 million portfolio after 30 years. However, the sooner you start, the better, as $1,000 each month for 40 years turns into nearly $10 million.

Let's look at five ETFs with strong track records that can help you retire a multi-millionaire.

With a 12.8% return over the past decade, the Vanguard S&P 500 ETF (NYSEMKT: VOO) is one of the first choices that investors should consider when looking to implement a dollar-cost-averaging strategy. The ETF replicates the performance of the S&P 500, which is widely considered the benchmark for the U.S. stock market.