How mortgage payments work in Toronto — and what the number leaves out
A mortgage payment is the single biggest line in most Toronto households’ budgets, so it is worth understanding exactly what moves it. Four inputs decide the figure: the purchase price, your down payment, the interest rate, and the amortization period. The calculator above runs the standard amortization formula on those inputs — the same math a lender uses, with one difference explained below.
The four inputs, in order of impact
Price and down payment together set the loan amount, and the loan amount scales everything else. In Toronto, where the average sale price across all property types was roughly $1.1 million in 2025 (TRREB), a 20% down payment means borrowing about $880,000. The interest rate is the second lever: on that balance, every 1% of rate is worth about $500 a month over 25 years. Amortization is the third: stretching from 25 to 30 years cuts the monthly payment by around 8–9% but adds tens of thousands of dollars in interest over the life of the loan.
Why your lender’s number may differ by a few dollars
Canadian fixed-rate mortgages must, by the Interest Act, be compounded no more than semi-annually. Most online calculators — including this one — divide the annual rate by 12 and compound monthly, which slightly overstates the payment. At 5% on $800,000 over 25 years the gap is about $25 a month. Variable-rate mortgages at most lenders do compound monthly, so for those the figure here is already exact. Either way, treat the result as a planning number and use the lender’s quote as the binding one.
Minimum down payment in Ontario
The rules are federal and apply to every Toronto purchase. You need at least 5% of the first $500,000 and 10% of the portion from $500,000 up to $1,499,999. From $1.5 million up, the minimum is 20% and the mortgage cannot be insured. For a $900,000 condo that works out to $65,000 — $25,000 on the first half-million plus $40,000 on the next $400,000 — which is 7.2% of the price, not 5%. Buyers often miss that the blended minimum climbs with price.
Mortgage default insurance adds to the balance
Anything under 20% down must be insured by CMHC, Sagen or Canada Guaranty, and the premium is added to your mortgage rather than paid in cash. The premium depends on the loan-to-value ratio: 4.00% of the loan at 5–9.99% down, 3.10% at 10–14.99%, and 2.80% at 15–19.99%. On a $700,000 condo with the minimum down payment, that is about $26,000 added to the loan — and Ontario charges 8% provincial sales tax on the premium, due in cash on closing.
What the payment does not include
- Property tax — Toronto’s 2025 residential rate is about 0.72% of MPAC assessed value; most 905 municipalities are higher (Brampton and Oshawa over 1%).
- Condo maintenance fees — commonly $0.65 to $1.10 per square foot per month in Toronto, so $650–$1,100 a month on a 1,000 sq ft unit.
- Home insurance, utilities and, for houses, a maintenance reserve of roughly 1% of value per year.
- Closing costs: land transfer tax (Toronto buyers pay two), legal fees, title insurance and adjustments.
Lenders fold property tax and half of condo fees into the qualifying calculation, which is why the maximum you can borrow on the affordability calculator is lower than what this payment alone would suggest.
Fixed vs variable and the stress test
The rate you enter should be the contract rate you expect to pay. But remember that federally regulated lenders qualify you at the higher of 5.25% or your contract rate plus 2 percentage points. If your approved rate is 4.5%, the bank checks that you could carry the payment at 6.5%. You never pay that rate; it only limits how much you can borrow.
A worked Toronto example
A $1,000,000 semi-detached in East York with 20% down leaves an $800,000 mortgage. At 4.5% over 25 years the payment is roughly $4,450 a month; at 30 years it is about $4,050. Add property tax of about $600 a month and the housing cost sits near $5,000 before utilities. The same home bought with 15% down would carry an insured balance of about $873,800 after the 2.8% premium — and a payment near $4,860.
Rules cited: Department of Finance Canada minimum down payment and insured-mortgage amortization rules (effective December 15, 2024); CMHC premium schedule; OSFI Guideline B-20 minimum qualifying rate; City of Toronto 2025 property tax rates. Figures are illustrative — confirm with a licensed mortgage professional.