Canadian Mortgage Rate Comparison Calculator
Compare up to 3 Canadian mortgage rate offers with proper semi-annual compounding. See effective rates, monthly payments, total interest over term, cashback impact, and break penalties. CAD.
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| Lender | Effective Monthly Rate | Monthly Payment | Interest Over Term | Cashback | Net Cost |
|---|---|---|---|---|---|
| Lender A 5yr fixed | 0.4238%/mo | CA$2,653 | CA$108,347 | — | CA$108,347 |
| Lender BBest 3yr fixed + 1.0% cashback | 0.4034%/mo | CA$2,589 | CA$63,293 | -CA$4,500 | CA$58,793 |
| Lender C 5yr variable | 0.5304%/mo | CA$3,001 | CA$136,812 | — | CA$136,812 |
Lowest monthly payment: Lender B
CA$2,589/mo (4.89% 3yr fixed)
CA$2,589/mo (4.89% 3yr fixed)
Lowest net cost over term: Lender B
CA$58,793 net (after cashback)
CA$58,793 net (after cashback)
Advanced
Advanced Rate Analysis
Canadian semi-annual compounding explained, fixed vs variable history, penalty comparison
Canadian mortgages are legally required to compound no more than semi-annually — unlike US mortgages which compound monthly. This creates a subtle but real difference in how effective rates work.
The Canadian Compounding Formula
Quoted Rate: e.g., 5.14% per annum
Semi-annual period rate: 5.14% ÷ 2 = 2.57%
Effective monthly rate: (1 + 0.0257)^(1/6) − 1
= (1.0257)^(0.1667) − 1
= 0.4238%/month
Annual effective rate: (1 + 0.4238%)^12 − 1 = 5.2060% p.a.
Semi-annual period rate: 5.14% ÷ 2 = 2.57%
Effective monthly rate: (1 + 0.0257)^(1/6) − 1
= (1.0257)^(0.1667) − 1
= 0.4238%/month
Annual effective rate: (1 + 0.4238%)^12 − 1 = 5.2060% p.a.
| Quoted Rate | Effective Monthly Rate | Effective Annual Rate | Monthly Payment (CA$450,000) |
|---|---|---|---|
| 3.0% | 0.2485% | 3.0225% | CA$2,130 |
| 4.0% | 0.3306% | 4.0400% | CA$2,367 |
| 5.0% | 0.4124% | 5.0625% | CA$2,617 |
| 5.1% | 0.4238% | 5.2060% | CA$2,653 |
| 6.0% | 0.4939% | 6.0900% | CA$2,879 |
| 7.0% | 0.5750% | 7.1225% | CA$3,152 |
Why this matters when comparing to US rates: A 5% Canadian mortgage does not equal a 5% US mortgage. The US uses monthly compounding (which produces a higher effective rate). A 5% Canadian rate is equivalent to approximately 5.06% US monthly-compounding rate. When comparing cross-border rates, always convert to the same compounding basis.
Pro
Pro Rate Strategy
Term optimization strategy, mortgage portability rules, blend and extend calculations
Choosing between a 1-year, 2-year, 3-year, or 5-year term is a bet on where rates will be at renewal. Here's how to think about it.
| Term | Typical Rate | Monthly Payment | Interest Over Term | Best When... |
|---|---|---|---|---|
| 1-Year Fixed | 4.5% | CA$2,491/mo | CA$19,859 | Rates expected to fall sharply |
| 2-Year Fixed | 4.7% | CA$2,541/mo | CA$41,015 | Rates expected to fall in 1–2 years |
| 3-Year Fixed | 4.9% | CA$2,589/mo | CA$63,293 | Moderate rate outlook, want some certainty |
| 5-Year Fixed | 5.1% | CA$2,653/mo | CA$108,347 | Uncertainty, want payment security for 5 years |
Rates Expected to Fall
1-year or 2-year fixed, or variable
If the BoC is in a rate-cutting cycle, shorter terms let you benefit from falling rates at renewal. Variable gives you the full benefit immediately. The trade-off: you accept renewal risk.
Rate Outlook Uncertain
3-year fixed
A 3-year term provides meaningful payment certainty without locking in for the full 5 years. If rates fall in 2–3 years, you renew at a lower rate sooner than a 5-year holder.
Tight Budget / Rate Risk Averse
5-year fixed
Payment certainty for 5 years. Most stress-tested scenario. The 5-year fixed is the "safe" choice — you pay a premium for certainty. Historically costs more on average but avoids the anxiety of variable rate changes.
How Canadian Mortgage Rates Work
Canadian mortgage rates are governed by the Interest Act, which requires all rates to be quoted on a nominal semi-annual compounding basis. This is different from US mortgages, which compound monthly. When a Canadian lender quotes you 5.14%, they mean 5.14% compounded semi-annually — resulting in an effective monthly rate of approximately 0.4239%, which is slightly less than a US 5.14% monthly-compounding rate.
To find the effective monthly rate, use the formula: Monthly Rate = (1 + Quoted Rate ÷ 2)^(1/6) − 1
Canadian Rate Comparison Formula
Effective Monthly Rate = (1 + Annual Rate ÷ 2)^(1/6) − 1
Monthly Payment = Balance × [r × (1+r)^n] ÷ [(1+r)^n − 1]
where r = effective monthly rate, n = amortization months
Example at 5.14%: r = (1 + 0.0514/2)^(1/6) − 1 = 0.42393%/month
On $450,000 over 25 years: ~$2,675/month
Monthly Payment = Balance × [r × (1+r)^n] ÷ [(1+r)^n − 1]
where r = effective monthly rate, n = amortization months
Example at 5.14%: r = (1 + 0.0514/2)^(1/6) − 1 = 0.42393%/month
On $450,000 over 25 years: ~$2,675/month
Comparing Three Lender Offers
$450,000 Mortgage — 25-Year Amortization
| Lender A: 5.14%, 5-year fixed, no cashback | Interest over term: ~$103,000 |
| Lender B: 4.89%, 3-year fixed, 1% cashback | Net cost after cashback: ~$65,000 |
| Lender C: 6.45%, 5-year variable, no cashback | Interest over term: ~$130,000 |
Lender B's 3-year fixed has a lower rate and cashback — making it the cheapest net cost over the term. However, after 3 years you face renewal risk. If rates are higher in 3 years, Lender A's 5-year certainty may prove to have been the better choice.
Frequently Asked Questions
The Interest Act of Canada requires that mortgage interest rates be calculated on a semi-annual basis, not more frequently. This was intended to protect borrowers from excessive compounding. As a result, the effective monthly rate for a Canadian mortgage is always slightly lower than you might expect from the quoted annual rate. Use the formula (1 + rate/2)^(1/6) − 1 to find the true monthly rate.
Amortization is the total length of the loan (e.g., 25 years). Term is the period for which your current rate and conditions are locked in — typically 1 to 5 years. At the end of each term, you renew at the current market rate. Most Canadians renew their mortgage 5–7 times over a 25-year amortization. This is a critical difference from US 30-year fixed mortgages where the rate never changes.
The Interest Rate Differential (IRD) penalty is the greater of: (1) 3 months interest on the outstanding balance, or (2) the difference between your contract rate and the posted rate for the remaining term, multiplied by the balance and remaining months. Big banks use their inflated posted rates as the comparison, which significantly increases the penalty. Credit unions and monoline lenders typically use a fairer comparison rate, resulting in lower IRD penalties.
The choice depends on your rate outlook and risk tolerance. If you believe the Bank of Canada will cut rates significantly, variable or shorter-term fixed (1–2 years) can save money. If you need payment certainty or fear rates may rise, 5-year fixed provides security. Historical data shows variable rates save money in about 80% of periods — but the 2022–2023 rate shock was a reminder of the risk. Consult a mortgage broker who can model scenarios for your specific situation.
Portability allows you to transfer your existing mortgage rate, terms, and outstanding balance to a new property when you move. This is valuable if your current rate is below market — you avoid paying an IRD penalty and keep your favorable rate. You typically have 30–120 days between selling and completing the new purchase to port the mortgage. If you need to borrow more for the new property, the additional amount is at the current market rate, blended with your existing rate.