Compound Growth Investment Calculator (Canada)

Tell the calculator what you are starting with, how much you will add each month, the annual return you expect and how many years you will stay invested, and it projects the balance with monthly compounding. It also splits the final number into the money you paid in and the growth compounding added, so you can see how much of your goal comes from your own deposits. Because it makes no assumption about tax, it works for a TFSA, an RRSP or a regular non-registered account.

How compound growth is calculated

The annual return is divided by twelve for a monthly rate, and the term in years is multiplied by twelve for the number of periods. The starting amount is compounded over all of those months, and each monthly contribution is grown for the months remaining after it lands, using the standard future value of an annuity. The two together give the projected balance. The total contributed is the starting amount plus every monthly deposit, and the growth is the projected balance minus that total.

Why compounding rewards time

Returns are earned on past returns as well as on the money you put in, so the growth figure can eventually overtake your deposits. Early contributions have the longest to compound, which is why starting early and contributing consistently usually beats investing a larger amount later. Extend the years or raise the monthly contribution and the growth part of the result expands faster than the paid-in part.

A worked example

You start with $10,000, add $200 a month, expect a 6% annual return and stay invested for 10 years. The monthly rate is 0.5%, applied over 120 months. The starting $10,000 compounds to about $18,194 on its own, and the $200 contributions grow to about $32,776, for a projected balance of about $50,970. You paid in $10,000 plus $200 × 120, or $34,000, so compounding added about $16,970. On a ten-year horizon your own deposits still make up most of the balance.

As a check, at a 0% return the future value is simply $10,000 + $200 × 120 = $34,000 with no growth, which is what the calculator reports.

A second worked example: the reward for time

Keep the $10,000 start, the $200 monthly contribution and the 6% return, but stay invested for 20 years. The projected balance rises to about $125,510. Your contributions grow from $34,000 to $58,000, less than double, but the growth rises from about $16,970 to about $67,510, nearly four times as much. Doubling the time more than doubles the outcome, because the early dollars compound longest and later returns are earned on a much larger base.

Assumptions and limitations

The projection assumes the same contribution every month, monthly compounding at one steady rate, and no withdrawals. Real returns are uneven, so the actual balance will swing above and below this line even if the long-run average matches your assumption. The figures are nominal and before fees and tax. Enter a return that already reflects expected inflation and costs, revisit the projection when your contribution or outlook changes, and treat the result as a planning guide rather than a promise.

Choosing the right Canadian account

The account you use decides how the growth is taxed. In a TFSA growth and withdrawals are tax-free, so the projection is close to what you keep. An RRSP shelters growth while the money stays invested but taxes withdrawals as income, reported on a T4RSP, so it defers tax rather than removing it. An FHSA shelters savings for a first home. A non-registered account is taxed on interest, dividends and realized gains as you go, which slows the compounding shown here. For a non-registered account in particular, enter a return reduced for fees and inflation rather than a headline market figure.

Common mistakes and how to read the projection

• Trusting a single rate. Markets do not deliver 6% every year; test a cautious rate next to an optimistic one.
• Confusing nominal with real. The balance is in future dollars, and inflation reduces what they will buy.
• Overlooking fees. A percentage point of annual cost compounds against you just as returns compound for you.
• Setting and forgetting. Revisit the projection whenever your contribution, horizon or outlook changes.

This article is general information only and not financial advice.

About This Tool: Compound Growth Calculator Canada

Compound growth calculator Canada: use this tool to get an instant estimate based on the figures you enter. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.