From 24/7 Wall St. · Ryne Mauck · · 2m
Half a million dollars just landed. Now what?
The math favors lump-sum investing, but your nerves might prefer spreading it out over a year. Here's how to decide and where to put it.
In brief
The math favors lump-sum investing, but your nerves might prefer spreading it out over a year. Here's how to decide and where to put it. Lump-sum investing wins about two-thirds of the time mathematically, but dollar-cost averaging lets you sleep at night. Pick whichever approach keeps you invested for 20 years…
Half a million just landed
You have a $500,000 rollover sitting in cash. Deploy it all at once or spread it over 12 months? The math and your gut point in opposite directions.
The math says go all in
Vanguard research shows lump-sum investing wins about two-thirds of the time because markets rise more often than they fall. Cash on the sidelines earns less than a diversified portfolio.
“lump sum wins about two-thirds of the time”
But regret is a real risk
If stocks drop 15% next month after you invest all $500K, you'll replay that decision for years. Spreading purchases over 12 months caps damage from any single bad entry point.
“Regret is a real portfolio risk.”
SPYM: your US engine
SPYM tracks the S&P 500 with one of the cheapest expense ratios available. It holds $153.9 billion in assets and returned 16.94% over the past year.
VXUS: don't ignore the world
VXUS covers developed Europe, Japan, and emerging markets across thousands of stocks with a 0.05% expense ratio. It's up 15.33% year-to-date, outpacing US markets in 2026.
BND: bonds when stocks tank
BND holds roughly 10,000 investment-grade US bonds with a 0.04% expense ratio and monthly distributions. It mutes equity drawdowns and lets you rebalance instead of panic-selling.
USFR: park your waiting cash
If you spread purchases over 12 months, USFR holds floating-rate Treasury notes that reset weekly. It charges 0.15%, pays monthly, and returned 4.09% last year with almost no price volatility.
Pick the plan you'll stick with
Two-thirds is just a probability. If stocks fall sharply after your lump-sum click, the math won't comfort you at 2 a.m. Choose whichever approach keeps you invested for 20 years.
“Pick the one that keeps you invested for the next 20 years”
What it means
Lump-sum investing wins about two-thirds of the time mathematically, but dollar-cost averaging lets you sleep at night. Pick whichever approach keeps you invested for 20 years.
