What dollar-cost averaging is
With dollar-cost averaging, often shortened to DCA, you invest the same amount every month no matter what the market is doing. When prices are low your contribution buys more units; when prices are high it buys fewer. Over time your average cost sits between the extremes, and, more importantly, the habit removes the need to guess the right moment to buy.
For most Canadians DCA is not a special strategy, it is simply how they invest: a payroll deduction, an automatic transfer to a TFSA or RRSP, a monthly purchase of an index fund.
DCA versus lump sum
If you already hold a large sum, research has often found that investing it all at once beat spreading it out, because markets tend to rise more often than they fall. DCA is not meant to outperform a lump sum; it helps people who earn money gradually and want to limit regret and behavioural mistakes. Use the initial amount field to test both approaches on the same dates.
Why the starting date matters
A saver who began in January 2000 contributed through the dot-com decline, the 2008 financial crisis, the 2020 pandemic crash and the inflation surge that followed. Each downturn lowered the portfolio but also let new contributions buy at cheaper prices. The calculator shows that path month by month, including the stretches when the balance sat below total deposits.
Shift the start date by a few years and the ending value will move noticeably. That is not a flaw, it is the lesson: the sequence of returns shapes your outcome, especially while you are still adding money.
Raising contributions with inflation
A flat five hundred dollars buys less every year. The optional inflation setting increases your deposit annually by the change in Canadian CPI, which keeps your contribution roughly constant in real terms. Compare both settings to see how much a modest annual raise adds to the end result. It is often more powerful than chasing a slightly higher return.
Building the habit
The hardest part of any investing plan is consistency. Setting up an automatic transfer on payday removes the temptation to wait for a better price, and it keeps contributions flowing during the scary months when headlines are worst. Those scary months are often when future returns are earned, because shares are being bought cheaply.
Try the calculator with different monthly amounts to see how sensitive the outcome is. Doubling your contribution has a far more predictable effect on the end balance than trying to pick the best asset, and it is entirely within your control.
Reading the results
The calculator returns an annualised figure based on the timing of every deposit, so it differs from a simple start-to-end return. Look at both the nominal figure and the real figure, and compare the final balance with total cash deposited. Remember that fees, taxes, and your actual account structure are not included, and that returns in the past do not predict future outcomes.
If you plan to save in a TFSA or RRSP, consider the contribution limits that apply to you; the calculator will happily model more than the allowed amount.