How much does a $800,000 mortgage cost?
An $800,000 mortgage is increasingly common in Toronto, Vancouver, and other high-cost Canadian markets. At this borrowing level, the difference between a good rate and an average one can mean over $100,000 in extra interest. Here’s the full breakdown.
Monthly payments at every rate
| Interest Rate | 25-Year Monthly | 30-Year Monthly | Difference |
|---|---|---|---|
| 3.00% | $3,786 | $3,372 | $414 |
| 3.50% | $3,994 | $3,592 | $402 |
| 4.00% | $4,208 | $3,818 | $390 |
| 4.50% | $4,427 | $4,053 | $374 |
| 5.00% | $4,653 | $4,294 | $359 |
| 5.50% | $4,883 | $4,542 | $341 |
| 6.00% | $5,118 | $4,797 | $321 |
| 6.50% | $5,359 | $5,057 | $302 |
| 7.00% | $5,605 | $5,323 | $282 |
Monthly payments include principal and interest only. Property taxes, insurance, and condo fees are additional.
Total cost of an $800,000 mortgage
| Interest Rate | Total Paid (25-yr) | Total Interest (25-yr) | Total Paid (30-yr) | Total Interest (30-yr) |
|---|---|---|---|---|
| 3.00% | $1,135,800 | $335,800 | $1,213,900 | $413,900 |
| 4.00% | $1,262,400 | $462,400 | $1,374,500 | $574,500 |
| 5.00% | $1,395,900 | $595,900 | $1,545,800 | $745,800 |
| 6.00% | $1,535,400 | $735,400 | $1,726,900 | $926,900 |
| 7.00% | $1,681,500 | $881,500 | $1,916,300 | $1,116,300 |
Key takeaway: At 5%, an $800K mortgage costs nearly $1.4 million total. At 7% with a 30-year amortization, you pay $1.1 million in interest — more than the original mortgage itself.
How your payments break down over time
Here’s how an $800,000 mortgage at 5% (25-year amortization) breaks down:
| Year | Annual Interest | Annual Principal | Remaining Balance |
|---|---|---|---|
| 1 | $39,440 | $16,400 | $783,600 |
| 5 | $36,310 | $19,530 | $713,400 |
| 10 | $31,200 | $24,640 | $612,000 |
| 15 | $24,400 | $31,440 | $481,600 |
| 20 | $15,400 | $40,440 | $313,000 |
| 25 | $3,760 | $52,080 | $0 |
25-year vs 30-year amortization
| Feature | 25-Year | 30-Year |
|---|---|---|
| Monthly payment (at 5%) | $4,653 | $4,294 |
| Total interest paid | $595,900 | $745,800 |
| Extra cost of 30-year | — | +$149,900 |
| Equity after 5 years | ~$86,600 | ~$57,800 |
| Who it’s for | Faster payoff, lower total cost | Lower monthly payments, more cash flow |
How payment frequency affects costs
| Frequency | Payment Amount | Annual Cost | Amortization | Interest Saved |
|---|---|---|---|---|
| Monthly | $4,653 | $55,836 | 25 years | — |
| Bi-weekly | $2,327 | $60,502 | 25 years | $0 |
| Accelerated bi-weekly | $2,327 | $60,502 | ~22 years | ~$67,200 |
Strategies to reduce your mortgage cost
- Choose a shorter amortization — 25 years instead of 30 saves $149,900 on an $800K mortgage at 5%
- Make accelerated bi-weekly payments — saves ~$67,200 and cuts 3 years off your amortization
- Use prepayment privileges — a $25,000 annual lump sum saves ~$105,000+ in interest
- Shop for a lower rate — 0.25% lower saves approximately $36,000 over 25 years
- Increase payments when you can — a $400/month increase saves ~$36,000 in interest
Insurance and qualification considerations
- If your home is under $1 million — you may qualify for insured mortgage (less than 20% down), which typically comes with lower rates
- If your home is $1 million or more — you need at least 20% down (uninsured mortgage)
- Stress test — you must qualify at rate + 2% or 5.25%, whichever is higher
- 30-year amortization — available for insured first-time buyers (homes under $1.5M) and for uninsured mortgages with 20%+ down
Where an $800,000 mortgage applies
- Detached homes in the GTA — Durham Region, Halton, Peel Region
- Townhomes in central Toronto or Vancouver — East York, Scarborough, East Vancouver
- Larger homes in Ottawa, Calgary, or Montréal — premium neighbourhoods
- High-ratio purchase — a $900K home with ~10% down (insured)
- Conventional purchase — a $1M home with 20% down