The Best Way to Invest for Retirement

You're looking to learn how to invest for retirement, and I'm guessing that's because you're already saving money and are now trying to figure out how best to make it work for you. If so, congratulations -- you're in a better place than most Americans, who have essentially no savings.

I'm going to be blunt: There is no one-size-fits-all "best" way to invest for retirement. It's mostly contextual based on how long you have until you actually retire, how much you can save, and how much money you need. And while there are plenty of rules of thumb out there for how to spend down your retirement savings, all of them have flaws, so you'll need to stay aware and think through what makes the most sense to you. Finally, and crucially, learn and understand your own risk tolerance. While some investments might yield better returns, that's often at the cost of more risk. You have to be able to sleep at night, confident in the security of your portfolio.

Highway sign in front of a partially blue sky reading: "The better way just ahead"
Highway sign in front of a partially blue sky reading: "The better way just ahead"

Image source: Getty Images.

With those caveats in mind, here's how I think about investing for retirement, based on how many decades are left between when you start and when you retire.

More than 25 years from retirement: Swing for the fences

If you're thinking about retirement more than 25 years out, you're already ahead of the game. But you've probably read all kinds of stuff out there about asset allocation and subtracting your age from some number (usually 100 or 110) to figure out how much of your portfolio should be in bonds.

My two cents? Ignore all of that. You've got plenty of time to invest, and I think you should take full advantage of stocks' higher return potential. Forget bonds: You don't need safety (assuming you already have cash set aside in an emergency fund) nearly as much as you need growth, so every dollar you invest today will be worth multiple dollars at retirement.

And no, I'm not suggesting you go put a bunch of money into bitcoin, or penny stocks, or trading soybean futures. But small-cap growth stocks might be just the ticket; they're earlier-stage businesses with plenty of upside as they grow into and dominate their niches. Now, to be clear, they're volatile -- and some will go out of business as their businesses crater. But holding a diversified portfolio of small-cap funds should help control for those issues.

If you have the stomach for small-cap investing, the Schwab U.S. Small-Cap ETF (NYSEMKT: SCHA) is a great place to start. Consider mixing a couple of small-cap growth funds with a large-cap growth fund or two, as well as some international exposure for more diversification.