How our Chief Investment Officer would invest $100,000 windfall.

The short answer:

If you receive a sudden windfall of $100,000 for a long-term goal like retirement, investing it all at once into a highly diversified portfolio of broad ETFs can help you capture the market’s general upward movement over time. This approach sets aside timing biases and focuses on long-term growth, which is essential since stocks historically rise about 8 out of every 10 years.

Tom YT Thumbnail If I Had $100K this is what i would invest in

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Key takeaways:

  1. Long-term investing: Since I still have time before retirement, I’d invest primarily in stocks to max out growth over a long horizon.
  2. Lump-sum investing: Investing a windfall immediately typically outperforms waiting, as "time in the market" is more beneficial than trying to "time the market."
  3. Diversification: Use broad ETFs (exchange-traded funds) to create a highly diversified portfolio, minimizing risk and capturing consistent market growth.
  4. Risk management: Balance high-risk investments with a diversified core portfolio, ensuring long-term financial goals remain secure.

One technique professional investors use to analyze their portfolio is to ask themselves: what would I invest in if I started from scratch? This sets aside all biases around what you currently own, and forces you to think fresh.

In this piece, we’ll do a version of this exercise. I will walk through how I would invest a sudden windfall of $100,000 today.

Investing for growth

To set the parameters, we’ll assume this money is for a long-term goal, like retirement. If we were saving for some shorter-term goal, this could all change. This is how I’d invest $100,000 for long-term gains.

I’m also speaking strictly for myself here. Everyone’s personal situation is different, so my advice to you could be quite different than what I’d do myself. I’m 47 years old, and I have a great job. I plan on working a long time to come.

Given all that, I’d put the $100,000 entirely in stocks. Not only do I have a fairly long time horizon before retirement, I also assume that even after I retire I’ll be living off that money for a long time. I need this money to grow, and stocks are the easiest way to achieve that.

Timing matters less than you think

Second, I would invest the money all at once. I know this might seem extreme to some. In my years in the investment business, I’ve known many people who had sudden windfalls. Overwhelmingly, they were very hesitant to put this new money into the market in one fell swoop.

However, the data says that waiting to invest tends to cost you. Historically, stocks have risen about 8 out of every 10 years. Of course, history may not repeat itself. But if that history is correct, it suggests that you have about an 80% chance that waiting to invest costs you.

Source: Dow Jones S&P Indices

Admittedly, it's certainly possible that this coming year will be one of the 2 out of 10 where stocks fall. However, this actually matters less than most people think.

If you’re going to be a long-term investor, you’re going to go through some bad markets. It actually doesn’t  matter what the timing of the bad markets are, assuming you aren’t adding or withdrawing from your account.

Here is the math behind this. Say that we invest for ten years, and in eight of those years, the market returns 15%. In two of those years, the market declines by 20%. The chart below shows the value of $100,000 invested in two scenarios. The blue line assumes the negative periods happen in years 7 and 9. The grey line assumes the down markets happen in years 1 and 3. You can see that both scenarios wind up in the same place.

Source: Facet calculations

Bear in mind that if you're actually adding or withdrawing from your portfolio, this math changes quite a bit. If you're continuing to add, it actually is better if the negative markets happen sooner. Future buys will occur at a lower level. If you're withdrawing, that’s a more complicated situation, and requires careful planning. This isn’t something we are going to cover in this article, but it definitely something that Facet can help you navigate.

Making the easy bet

I would invest my $100,000 in a highly diversified portfolio using broad ETFs. I believe the more diversified you are, the more likely your portfolio will capture the general upward movement in stocks over time. The most important thing to me is that when I do retire, I can afford to live the life I want to live. If I invest in a  more narrow portfolio, even something like an S&P 500 fund, I’m taking more risk.

I would be the first to admit: this might sound pretty boring. It's true that if I buy a set of globally diversified ETFs, there’s no chance I turn my $100,000 into $1 million in a short period.

However, one thing I’ve learned over my 25 years in the investment business is that success comes from finding the easiest bet you can make. Then make that bet over and over. When it comes to investing in stocks, the bet I’m most confident in is that stocks will generally rise over time. To me, that’s the “easy bet” and the one I want to make over and over.

What if you want to take a bit more risk?

All of that summarizes what I’d do if I had a sudden influx of $100,000. However, this isn’t the only way to do it. In fact, I’m sure a lot of people would take at least some of that money and invest it in something with more risk but maybe more upside. Could be an individual stock, some set of stocks or even crypto.

If you're considering such an investment, be sure you size that bet right. One approach is to separate your portfolio into two buckets: a higher risk bucket that you can afford to lose, and a more diversified bucket that is meant to make sure you meet your goals.

Make the “meet my goals” bucket large enough that you’re going to be able to retire on time, even if the other bucket doesn’t contribute at all. Or put another way, make the high risk bucket small enough that even if it loses half its value and never recovers, your financial goals aren’t totally ruined.

Sometimes boring is best

As I said, I realize my $100,000 investment plan isn’t very exciting. But for me and my situation, I feel most confident that a boring plan is actually best. I could chase big gains, but I’d rather give myself a pretty high probability of hitting my long-term goals, and someday, a very long time from now, enjoying my retirement.

Ready to get more organized and have more clarity with your money? Schedule a free call with Facet. We’ll show you how a personalized financial roadmap, built for you by a CFP® professional, can turn your money into a tool to help you live a better life today, and feel more confident about tomorrow.

Disclosures

The information, opinions, and market data presented herein are prepared by Facet Wealth, Inc. (“Facet”), an SEC-registered investment adviser, for educational and informational purposes only and does not constitute individualized investment, financial, tax, or legal advice, nor a recommendation or offer to buy or sell any security.

Market data and economic commentary referenced are obtained from sources believed to be reliable and are confirmed accurate as of the date of publication. Facet assumes no obligation to update or supplement this material to reflect subsequent market shifts or developments.

Investing involves inherent risk, including the possible loss of principal. Past performance is no guarantee of future results. Asset allocation and diversification strategies do not ensure a profit or protect against loss in declining markets. SEC registration does not imply a certain level of skill or training.

©2026 Facet Wealth, Inc. All Rights Reserved

FAQs

It’s generally better to invest the money all at once because historical data shows that waiting to invest tends to cost you. Since stocks have historically risen about 8 out of every 10 years, delaying your investments means you face an 80% chance that waiting will work against your long-term roadmap.

If you’re a long-term investor who isn’t actively adding or withdrawing from your account, the timing of bad markets actually doesn’t matter. Whether the negative periods happen early on or later in your journey, the math shows that your portfolio will wind up in the exact same place over a ten-year period.

You can manage higher-risk investments by separating your money into two distinct buckets. Keep a larger, diversified bucket to ensure you can meet your retirement goals, and keep the high-risk bucket small enough so that even if it loses half its value, your overall financial roadmap isn’t ruined.

About Facet

Facet is a national, SEC-registered investment advisor (RIA) and consumer fintech leader dedicated to making expert financial planning accessible to everyone.

Through a transparent, flat-fee membership model, Facet provides objective guidance designed to put the member’s best interest first—always. Unlike traditional firms that often take a cut of your returns or charge by the hour, Facet’s affordable fee doesn’t change even as your money grows, helping you keep more of your own money for the life you want to live.

Facet combines user-friendly technology with a dedicated team of CERTIFIED FINANCIAL PLANNER® professionals to deliver a personalized roadmap for every aspect of a member’s financial life. This comprehensive approach covers everything from the big milestones to everyday decisions—including investment management, tax strategy, equity compensation, and retirement planning—evolving as your life and opportunities unfold. Facet’s mission is to empower individuals to move beyond “standard” advice, helping them make confident decisions and live more enriched lives through financial planning the way it should be: simple, guided, and all about you.

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