💹 Compound Interest Calculator Canada — TFSA & RRSP Growth
Compound interest is the single most powerful force in personal finance — and it works best when you start early, contribute regularly, and minimise fees. This calculator shows you exactly how your money grows when interest earns interest, whether you're building a TFSA, growing an RRSP, or planning for any long-term goal. The results are often astonishing.
Starting with $10,000 and adding $300/month at 7% for 25 years produces $283,000. Wait 10 years to start and the same contributions produce only $148,000 — less than half. Time is worth more than any amount of money. Enter your numbers to see the real power of compounding applied to your situation.
The Science of Compound Interest — A Canadian Investor's Guide
7–8%
Historical Equity Avg
$102K
TFSA Room (since 2009)
How Compound Interest Works
Compound interest means earning interest on your interest. In year one, $10,000 at 7% earns $700. In year two, you earn 7% on $10,700 — generating $749. Each year, the base grows and so does the interest. Over 30 years, $10,000 at 7% becomes $76,123 with no additional contributions. Add $300/month and it becomes $378,000.
The Rule of 72
Divide 72 by your annual rate to estimate how long it takes your money to double. At 7%, money doubles every 10.3 years. At 10%, every 7.2 years. At 4%, every 18 years. This rule of thumb helps you quickly compare investment options and understand what fee differences actually cost you over time.
The Devastating Impact of Investment Fees
The MER (Management Expense Ratio) is the annual fee charged by mutual funds and ETFs. It compounds against you in the same way that returns compound for you. A $200,000 portfolio at 7% growth with a 2% MER delivers $670,000 after 25 years. The same portfolio with a 0.2% MER delivers $1,040,000 — a difference of $370,000 purely from fees. This is why Canadian financial educators unanimously recommend low-cost index ETFs over actively managed mutual funds for long-term investing.
The Best Accounts for Compound Growth in Canada
- TFSA: All growth tax-free forever. Best for most Canadians for long-term investing.
- RRSP: Tax-deferred growth. Powerful for high-income earners. Must withdraw (taxably) eventually.
- FHSA: Tax-deductible contributions + tax-free qualifying withdrawal. Best option for future first-time homebuyers under 71.
- Non-registered: No contribution limits but growth is taxed annually. Hold here only after maxing TFSA and RRSP.
💡 Best-in-class Canadian ETFs for TFSA growth: XEQT (iShares, 0.20% MER, 100% global equity) and VGRO (Vanguard, 0.24% MER, 80% equity/20% bonds) are widely recommended by Canadian financial educators for their simplicity, diversification, and ultra-low costs. Both auto-rebalance and reinvest dividends automatically.
❓ Frequently Asked Questions — Compound Interest
What is compound interest and why does it matter?
Compound interest means earning interest on your interest — not just on the principal. In year one, $10,000 at 7% earns $700. In year two, you earn 7% on $10,700 — generating $749. Each year the base grows. Over 30 years, $10,000 at 7% becomes $76,123 with no additional contributions. This exponential growth is why starting early and staying invested consistently produces dramatically better outcomes than starting later with larger contributions.
What is the Rule of 72?
Divide 72 by the annual return rate to estimate how long it takes your money to double. At 7%: doubles every 10.3 years. At 10%: every 7.2 years. At 4%: every 18 years. This is why investment fees matter enormously — paying 2% MER instead of 0.2% effectively reduces your compounding rate by 1.8 percentage points, extending your doubling time significantly. Run the Rule of 72 on the fee difference to understand what active management actually costs you.
How much does waiting 5 years to invest cost?
Starting $300/month at age 25 at 7% for 40 years builds approximately $785,000. Starting at 30 at the same rate for 35 years builds approximately $540,000 — $245,000 less despite only missing 5 years of contributions ($18,000 of actual contributions). The missing compounding on those early contributions is what causes the dramatic shortfall. Each year of delay costs exponentially more the longer you wait — starting at 40 instead of 35 costs even more proportionally than starting at 30 instead of 25.
What is the best account for compound growth in Canada?
Inside a TFSA, all compound growth is completely tax-free forever — you keep 100% of the compounding. Inside an RRSP, growth is tax-deferred until withdrawal. In a non-registered account, annual taxes on dividends, interest, and realised capital gains reduce the compounding base each year. Always maximise TFSA first, then RRSP, then non-registered for long-term compound growth. The tax drag on non-registered accounts reduces effective compounding by 0.5%–1.5% annually depending on your marginal rate and investment type.
What return rate should I use for Canadian investment projections?
Conservative but realistic assumptions: 6%–7% for a globally diversified equity ETF portfolio (below historical average of ~8%–10% to account for sequence risk). 5%–6% for a balanced 60/40 portfolio. 4%–5% for conservative GICs. 3.5%–4% for a high-interest savings account in 2026. Always run calculations at multiple rates (5%, 7%, 9%) to understand the range of outcomes. Never assume above 10% for long-term planning — historical averages include recovery from severe crashes that you may not have the time horizon to fully benefit from.
How do investment fees affect compound growth in Canada?
The MER (Management Expense Ratio) compounds against you just as returns compound for you. A $200,000 portfolio at 7% gross with a 2% MER delivers $670,000 after 25 years. The same portfolio with a 0.2% MER delivers $1,040,000 — a difference of $370,000 purely from fees. This is why Canadian financial educators unanimously recommend low-cost index ETFs (0.1%–0.25% MER) over actively managed Canadian mutual funds (1.5%–2.5% MER). No actively managed fund in Canada consistently outperforms a simple index ETF after fees over long periods.
What are the best Canadian ETFs for compound growth?
The most widely recommended all-in-one ETFs for Canadian investors: XEQT (iShares Core Equity ETF Portfolio, 100% global equity, 0.20% MER) and VGRO (Vanguard Growth ETF Portfolio, 80% equity/20% bonds, 0.24% MER). Both auto-rebalance and reinvest dividends automatically, requiring no ongoing management. Available commission-free at Wealthsimple and at low cost through Questrade. These ETFs hold thousands of global companies across North America, Europe, Asia, and emerging markets — providing maximum diversification at minimal cost.
Should I invest monthly or in lump sums?
Academic research shows lump-sum investing outperforms dollar cost averaging (DCA) approximately 2/3 of the time because markets rise more often than they fall. However, for most Canadians, automated monthly contributions is the practically superior approach — it removes the temptation to time the market, ensures consistency regardless of market conditions, and is psychologically manageable. The "optimal" answer is invest lump sums immediately when you have them, and automate monthly contributions throughout the year. Never let money sit uninvested waiting for a "better time" to enter the market.
What happens to compound growth during a market crash?
During a crash, portfolio value temporarily falls — sometimes dramatically. The 2020 COVID crash dropped markets 35% in weeks; the 2008 crisis dropped 50% over 18 months. However, every major market crash in history was followed by full recovery and new highs. Critically: if you continue contributing monthly during the crash, you're buying more units at lower prices (dollar cost averaging), which amplifies your returns when the market recovers. Investors who stayed fully invested through every major crash built the most wealth over time. The worst outcome is panic-selling at the bottom and crystallising permanent losses.
What is monthly vs annual compounding and does it matter?
Monthly compounding calculates and adds interest 12 times per year; annual compounding once. Monthly compounding produces slightly higher returns because you earn interest on the interest 12 times rather than once. The difference at typical investment rates is modest — less than 1% of final balance over long periods — and is far less important than your actual return rate and the amount you contribute. Most investment accounts compound monthly or even daily. GICs compound annually or semi-annually. For practical planning, use annual compounding as a conservative estimate.