
Mortgage: calculators
What does putting less than 20% down cost?
With a down payment under 20%, mortgage default insurance is added to your loan. Here is the premium, the tax you pay on it in cash, and what it adds to the mortgage.
Insurance premium
$26,000
- Down payment
- 7.1%
- Loan before premium
- $650,000
- Loan-to-value
- 92.9%
- Premium rate
- 4.00%
- PremiumAdded to the mortgage.
- $26,000
- Ontario tax on the premium (8%)Always cash on closing. It cannot be added to the mortgage.
- $2,080
- Total mortgage
- $676,000
- Cash needed on closingDown payment and premium tax. Legal fees and land transfer tax are extra.
- $52,080
- Amortization used
- 25 years
An estimate of the mortgage default insurance premium under the published CMHC rules. The premium applies when the down payment is under 20%, cannot be obtained at all on homes of $1.5 million or more, and the Ontario retail sales tax on it is always payable in cash on closing. Insurers price individual files, so confirm the figure with Sukhpreet Mahal, Mortgage Agent Level 1, Mortgage Alliance before relying on it.
How the premium is worked out
It follows the down payment
The less you put down, the higher the rate: about 2.8% from 15% down, 3.1% from 10%, and 4.0% below that. It is charged on the loan, not the price.
A longer amortization costs more
Stretching an insured mortgage past 25 years adds 0.20% to the premium. Only first-time buyers and newly built homes can go to 30 years at all.
The tax is always cash
Ontario's 8% tax on the premium cannot be added to the mortgage. Budget for it alongside your legal fees and land transfer tax.
Some homes cannot be insured
At $1.5 million or more, no insurance is available, so at least 20% down is required. The same applies above 95% loan-to-value.
Common questions
- What is mortgage default insurance?
- It protects the lender, not you, against the possibility that you cannot repay. It is required whenever the down payment is less than 20% of the purchase price, and it is what makes lending at a high loan-to-value possible at ordinary rates.
- How much is the premium?
- It is a percentage of the loan and rises as the down payment falls: roughly 2.8% at 15% to 19.99% down, 3.1% at 10% to 14.99%, and 4.0% below 10%. Amortizing an insured mortgage past 25 years adds a further 0.20%.
- Can I add the premium to my mortgage?
- Yes, and most buyers do, which spreads it over the life of the loan but means paying interest on it. You can also pay it on closing instead. The calculator shows both, so you can see what the interest costs.
- Why is there a separate tax to pay in cash?
- Ontario charges 8% retail sales tax on the premium. Unlike the premium itself, that tax cannot be added to the mortgage, so it is always payable in cash on closing. It is one of the costs buyers most often forget.
- Can any home be insured?
- No. Homes priced at $1.5 million or more cannot be insured at all, so those purchases need at least 20% down. No insurer will write a deal above 95% loan-to-value either.

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