What Is Dollar-Cost Averaging (And Does It Actually Work?)

If you've ever Googled "when should I start investing," you've seen the advice: just dollar-cost average. Buy regularly, don't try to time the market, and let time work in your favour. It's the most commonly recommended strategy for beginners. But is it actually the best approach?

What dollar-cost averaging actually means

Dollar-cost averaging (DCA) is simple: instead of investing a large amount all at once, you invest a fixed dollar amount at regular intervals — say, $500 every month. When prices are high, your $500 buys fewer shares. When prices drop, it buys more. Over time, this averages out your cost per share.

The appeal is obvious: you don't need to guess whether the market is high or low. You just keep investing on a schedule, regardless of what's happening.

DCA vs. lump sum: what the research says

Here's where it gets interesting. A widely cited Vanguard study looked at rolling 10-year periods across the US, UK, and Australian markets. The finding: lump-sum investing beat DCA about two-thirds of the time.

The reason is straightforward. Markets go up more often than they go down. If you have money available to invest and you wait to spread it out over months, you're likely keeping some cash on the sidelines while the market rises. On average, you would have been better off investing it all immediately.

But "on average" is doing a lot of work in that sentence.

When DCA wins

Lump-sum investing wins on math. DCA wins on behaviour. And behaviour is what actually determines your returns.

Consider this: you inherit $50,000. You know the statistics say to invest it all today. But the market just hit an all-time high, there's a recession in the news, and your stomach is in knots. So you invest $10,000 per month over five months instead.

Did you leave some returns on the table? Statistically, probably. But you actually invested the money instead of letting it sit in a chequing account for two years while you waited for the "right time." That's the real win.

DCA makes the most sense when:

• You're investing from your paycheque (you're already doing DCA naturally)
• You have a lump sum but feel anxious about investing it all at once
• You're new to investing and want to build confidence gradually
• You'd rather have a system than make repeated decisions

The real enemy: not investing at all

The DCA vs. lump sum debate misses the bigger point. The difference between the two strategies over a long time horizon is relatively small. The difference between either strategy and not investing at all is enormous.

If you invested $500 per month into a broad Canadian/global ETF earning 7% annually over 25 years, you'd have roughly $405,000 — from $150,000 in total contributions. The $255,000 difference is what your money earned by being invested. Whether you started each month's contribution on the 1st or the 15th barely matters.

Use our compound interest calculator to run your own numbers.

How to set up automatic DCA in Canada

On Wealthsimple

1. Open a TFSA (or RRSP/FHSA) on the Wealthsimple app
2. Go to Funding → Recurring deposits
3. Set the amount and frequency (weekly, bi-weekly, or monthly)
4. Turn on Auto-invest and select your ETF (XEQT, VEQT, etc.)
5. That's it — Wealthsimple will deposit and invest automatically

On Questrade

1. Open a registered account on Questrade
2. Set up a pre-authorized deposit under Funding → Automatic deposits
3. Questrade doesn't auto-buy, so you'll need to manually purchase ETFs when cash arrives (ETF purchases are commission-free)
4. Some investors set a calendar reminder to buy on deposit day

Best ETFs for DCA in Canada

For a set-and-forget DCA strategy, you want a single all-in-one ETF that gives you global diversification with automatic rebalancing:

• XEQT / VEQT — 100% equities, maximum growth potential, best for 10+ year time horizons
• XGRO / VGRO — 80% equities / 20% bonds, slightly smoother ride
• XBAL / VBAL — 60% equities / 40% bonds, more conservative, good for medium time horizons

See our full ETF comparison for detailed breakdowns of fees, holdings, and performance.

Bottom line

If you have a lump sum and strong nerves, invest it all now. If you want a system you'll actually stick to, set up automatic DCA and stop thinking about it. Either way, the math is clear: the best time to invest was yesterday. The second best time is today. The worst time is "when I feel ready" — because that day rarely comes.