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Mortgage payment comparisons

Fixed vs. Variable Mortgage Calculator

Compare a fixed-rate mortgage with adjustable-payment and fixed-payment variable scenarios. Enter your balance, repayment period and rate assumptions to see payments, interest and debt remaining. You can test up to three rate changes and download the monthly schedules. These are illustrations of your assumptions, not rate forecasts or mortgage offers.

Compare your own assumptions

Fixed or variable: compare payments and debt remaining.

Enter the mortgage rates you want to test, after any discount or premium to prime. The starting figures are examples, not available rates or forecasts. All scenarios use monthly payments.

Optional changes to the variable mortgage rate

Enter the new annual mortgage rate from the start of the selected month. For example, month 13 means after the first 12 payments. Leave both fields empty for a change you do not need.

How the calculation works and what it excludes

The fixed scenario uses an annual nominal rate compounded semi-annually. Variable scenarios use the compounding option you select. Check the actual convention in your lender’s agreement.

The adjustable-payment model recalculates the payment after each rate change over the remaining original amortization. The fixed-payment model keeps its initial payment and stops before the first month when interest would consume that payment. It does not assume that a lender will allow unpaid interest to accumulate or predict the lender’s trigger response.

Changes apply at the start of a month; payments occur at month-end. Calculations retain precision and display rounded dollars. Daily interest, lender rounding, payment-date differences, prepayments, fees, penalties, insurance and taxes are excluded. This is a comparison of your assumptions, not a mortgage quote or approval.

Use the results alongside your plans to sell, refinance or make extra payments. Read about trigger rates or discuss your mortgage options with Streetwise.

Set the mortgage amount, repayment period and rates

A comparison starts with the amount borrowed, the repayment period and assumed interest rates. The repayment period is also called amortization. A variable-rate scenario needs assumptions about when the rate could change and by how much. Those inputs illustrate a scenario; they are not a rate forecast.

A comparison may examine a fixed-rate mortgage and variable-rate arrangements whose payments change or remain fixed until the contract requires a change. The actual mortgage agreement determines how the loan operates.

Compare payments with interest and principal repayment

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A smaller payment can leave more money available now while repaying less debt. Looking at total interest, principal repaid and the remaining balance shows that difference over the period being examined.

For a rental, include rent and operating expenses alongside the mortgage payment to compare the property's monthly cash flow.

Understand how a variable-rate payment changes

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With an adjustable payment, a rate change can change the payment. With a fixed payment, it can change the amount going towards interest and the amount repaying principal. The mortgage agreement determines what happens at a trigger rate and under other lender conditions.

Read the trigger-rate guide for the details to check in your agreement.

Include mortgage terms in the comparison

The scenario with the lowest interest total does not answer every mortgage question. A planned sale, refinance or extra payment may have costs and conditions under the contract.

Contact Streetwise about your mortgage options. For mortgages across several properties, read about the Portfolio Financing Review.