Dollar-cost averaging (DCA) — investing a fixed amount every month instead of all at once — is the internet's default "safe" advice. It feels prudent: you can't accidentally buy the top. But feeling prudent and making more money are different things, so we measured it.
The rule we tested:
Invest €100 on the first trading day of every month. Compare it to investing the same total amount as a single lump sum at the very start.
We ran it on nine assets — Apple, Microsoft, Amazon, Tesla, Nvidia, Alphabet, Meta, the S&P 500 (SPY) and the Nasdaq-100 (QQQ) — over one and three years. You can rerun any of it in the free DCA calculator.
The result: lump-sum won almost everywhere
| Ticker | 1yr: DCA | 1yr: Lump | Edge | 3yr: DCA | 3yr: Lump | Edge |
|---|---|---|---|---|---|---|
| AAPL | +26.7% | +52.6% | −25.9 | +50.6% | +71.4% | −20.8 |
| MSFT | −13.6% | −22.1% | +8.5 | −4.0% | +15.8% | −19.8 |
| AMZN | +5.5% | +7.6% | −2.1 | +29.8% | +90.1% | −60.3 |
| TSLA | −4.9% | +12.6% | −17.5 | +34.4% | +39.0% | −4.6 |
| NVDA | +13.9% | +27.1% | −13.2 | +119% | +376% | −257 |
| GOOGL | +23.2% | +79.3% | −56.1 | +89.2% | +184% | −94.8 |
| META | −4.4% | −10.7% | +6.3 | +25.7% | +117% | −91.3 |
| SPY | +10.6% | +20.2% | −9.6 | +35.2% | +70.8% | −35.6 |
| QQQ | +14.3% | +26.3% | −12.0 | +45.3% | +90.8% | −45.5 |
Edge = DCA return minus lump-sum. Data: live Yahoo Finance daily closes, run July 2026.
Lump-sum beat DCA in 16 of 18 tests. The logic is simple and unavoidable: markets rise more often than they fall, so money you invest earlier spends more time compounding. Drip it in over a year and, on average, you're just holding cash on the sidelines while the market climbs without you. (This matches Vanguard's well-known finding that lump-sum beats DCA roughly two-thirds of the time.)
The two exceptions tell you exactly when DCA helps
Look at the only two green cells over one year: Microsoft (+8.5) and Meta (+6.3) — the two names that fell over that period. When an asset drops and later recovers, DCA quietly buys more shares at the lower prices, so it comes out ahead. DCA's edge is real, but it only shows up in falling or sideways markets. In a rising one, it's a drag.
Why this whole comparison is a trap
Here's the part that matters more than the table. Most people don't have a lump sum to invest. You get paid monthly and invest what you can spare. For you, the real choice isn't "DCA versus invest it all today" — it's "DCA versus leave it in my bank account and wait for a better moment."
Against that alternative, DCA wins decisively, because the comparison is "invested" versus "not invested," and being invested is what builds wealth. The lump-sum-versus-DCA debate only applies if you're sitting on a pile of cash right now — an inheritance, a bonus, a house sale. If you are, the data says: on average, put it to work sooner rather than later.
What DCA actually buys you (that returns don't show)
- You're never all-in at the top. Your money enters at many prices, so a crash the week after you start doesn't wreck your whole position.
- It removes the timing decision. No agonising over "is now a good time?" — the calendar decides. For most investors that behavioural win is worth more than a few percentage points.
- It matches real life. Automatic monthly investing is what a salary makes possible, and consistency beats cleverness over decades.
The honest fine print
Returns use daily closes only and ignore dividends, fees and taxes. Results assume you actually stayed the course — the hardest part in practice. Only still-listed assets were tested (survivorship bias), and past results predict nothing. This is educational, not investment advice.
See it for your own numbers
Want to know what €100 (or €500) a month into your favourite fund would have grown into — and how it compares to going all-in? Change the amount, asset and dates here:
Free DCA calculator → · or backtest an active strategy
To run this against your own real contributions and holdings, that's what Pulse is for.
Investing Paths builds honest, free tools for retail investors. Nothing here is investment advice; backtested results are hypothetical and ignore real-world costs. Do your own research.