Mortgage Calculator | Michael Friedman

I am off taking a long-needed break. In my absence, my associated broker Patti Gallagher will be more than happy to assist you.

Patti’s contact information are as follows:

A tool for variable-rate mortgage holders · Updated May 2026

Where do you actually stand?

A two-part check: how much room you have on the 40% debt-service threshold, and what your payment becomes if Prime moves up.

01 Your income & monthly obligations

Gross income means before tax. If you’re using TDS mode, include heat & 50% of condo fees as lenders do.

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Car loans, lines of credit, credit card minimums, student loans, child support.

02 Your mortgage

Use your current balance and rate. The amortization is how many years are left, not your original term.

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Most variable rates today sit around Prime (4.45%) minus your discount.
years
Where you stand today

Your debt-service position

Your current ratio
The 40% threshold
Headroom (or shortfall)

If Prime moves up — what happens to your payment?

Same mortgage. Same amortization. We just shock the rate to see what the new payment would be. The red row is your current baseline.

Scenario Rate Payment Monthly Δ Annual Δ New TDS%
Under 40% 40–44% Over 44%

Payments are calculated using standard Canadian mortgage formulas (semi-annual compounding). The 40% threshold is a guideline based on typical lender Total Debt Service limits (40–44% depending on product). This calculator is for informational purposes only and does not constitute pre-approval, lender offers, or financial advice. Talk to your broker before making any decisions about your mortgage.