The S&P 500 closed at a record 7,818.93 on October 6, its 28th record close of 2026. For anyone sitting on cash — a bonus, an inheritance or savings built up over time — that headline raises an uncomfortable question: is it a bad time to invest?
The choice usually comes down to two approaches. You can invest everything at once (lump sum), or spread purchases over several months (dollar-cost averaging, or DCA). Here is how to think about each.
What the evidence says
Historically, lump-sum investing has come out ahead more often than not. A widely cited Vanguard study of US, UK and Australian markets found that investing a lump sum immediately beat spreading it over 12 months roughly two-thirds of the time. The reason is simple: markets rise more often than they fall, so money that waits on the sidelines usually misses gains.
Record highs do not change that logic as much as people expect. Because markets trend upward over the long run, new highs are common. Since 2026 began, the S&P 500 has set 28 of them. A record high is not, by itself, a signal that a fall is coming.
Why dollar-cost averaging still makes sense for many people
If lump sum wins more often, why does DCA remain so popular? Because the one-third of cases where it loses can be painful, and investing is as much about behavior as math.
- It limits regret. Investing everything the day before a 20% drop is a hard experience. Spreading purchases reduces the chance of buying at a single bad moment.
- It keeps you invested. An investor who panics and sells after a crash does far more damage than one who simply entered the market more slowly.
- It fits how most people earn money. Regular contributions from a salary, such as monthly retirement plan deposits, are already a form of DCA.
Today’s market adds a twist
Two conditions in late 2026 are worth factoring in:
1. Cash pays well. With the Fed’s policy rate at 3.75%–4.00%, money market funds and short-term Treasury bills offer meaningful yields. That reduces the cost of waiting: money held for a DCA plan still earns income while it sits.
2. The rally is narrow. Gains this year have been concentrated in technology and energy, while the 10-year Treasury yield sits near 5.3%, its highest since 2002. Concentrated markets can be more vulnerable to sharp pullbacks, which strengthens the case for diversification whichever entry method you choose.
A simple decision framework
- Long time horizon (10+ years) and comfortable with volatility? Lump sum has the statistical edge.
- Worried about investing right before a drop? Use DCA over a defined period, such as 6–12 months, and automate it so you don’t second-guess each purchase.
- Somewhere in between? Invest half now and dollar-cost average the rest. This hybrid captures part of the lump-sum advantage while limiting regret.
Mistakes to avoid
- Waiting for a crash that may not come. Trying to time the market often means watching it climb without you.
- Abandoning the plan mid-way. DCA only works if you keep buying, especially when prices fall.
- Ignoring diversification. How you enter matters less than what you own. A broad mix of stocks and bonds that suits your goals is the foundation.
- Investing emergency money. Keep three to six months of expenses in cash before investing in stocks.
Key takeaway
Record highs are a normal part of long-term investing, not a reason to stay out. Lump-sum investing wins more often, but dollar-cost averaging is a sound choice if it helps you stay invested. The best plan is the one you will actually stick with.
This article is for educational purposes and does not constitute financial advice. Consider your own circumstances or consult a licensed financial professional before investing.