Synoria AI CorporationAutonomous software company
Accounting & Finance

Canadian Mortgage Prepayment & Renewal Optimizer

A Canadian mortgage is compounded semi-annually by law, not monthly - a calculator that divides the quoted rate by twelve is answering a different question. On $400,000 at a quoted 5.5% over 25 years, the correctly-derived monthly payment is $2,441.57. Prepayment privileges are use-it-or-lose-it per year and capped as a percentage of the ORIGINAL principal, not the current balance: a 15% privilege on that mortgage is $60,000 a year, and paying $20,000 of it saves $11,790.53 of interest over a 5-year term and leaves $244,959.47 owing at renewal instead of $356,750.00. At renewal, the same $244,959.47 balance costs $165,528.62 in interest over the remaining 240 months at a 5.75% renewal rate, or $150,841.49 including a $1,500 fee at a 5.25% competing rate - switching is $14,687.13 cheaper here, and stays cheaper up to a $16,187.13 fee.

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Accounting & Finance

Canadian homeowners approaching a mortgage renewal, and anyone deciding whether an annual lump-sum prepayment is worth making before that renewal date.

How it works

  1. Enter your principal, quoted rate, amortization and term - the payment shown is the one that rate and term actually produce.
  2. Enter the extra amount you plan to prepay each year; it is capped at the privilege you enter, not assumed to be free.
  3. Enter your lender's renewal rate and a competing rate with its switch fee.
  4. Read which option costs less over the remaining amortization, and by how much.

What you gain

  • Derives the monthly rate the way the Interest Act actually requires for a Canadian fixed-rate mortgage - the quoted rate compounded SEMI-ANNUALLY, converted to its monthly equivalent - not the annual rate divided by twelve
  • Caps any extra payment at the prepayment privilege entered, a percentage of the ORIGINAL principal per year, and says plainly how much of an over-privilege payment is actually applied rather than treating all of it as free
  • Shows interest paid over the current term with and without the extra payment side by side, so the saving is a number and not an assumption
  • Compares a real stay-or-switch renewal decision on the SAME remaining balance and the SAME remaining amortization, so only the rate and the one-time fee differ

Screenshot

Canadian Mortgage Prepayment & Renewal Optimizer

Technical details

Standard50.99 USD · 1500 requests · 31-day license · one-time payment · 31-day access
Pro101.98 USD · 6000 requests · 31-day license · one-time payment · 31-day access
Isolationdedicated instance per license
Usage meteringLLM usage metered per license
Accessweb sign-in with license key

How to set up & use

  1. Buy the license — your key (lic_...) appears on the order page and in your email.
  2. Sign in at app.synoriaai.com with your license key.
  3. No installation — the product runs in your browser, on your own isolated instance.
  4. 1. Enter your mortgage details: original principal, current term rate, remaining balance, and remaining amortization.
  5. 2. Input your annual prepayment privilege (as a percentage of the original principal) and the extra amount you plan to pay each year.
  6. 3. Click 'Calculate Prepayment' to see the interest paid over the current term with and without the extra payment, plus the exact amount applied (capped if over your privilege).
  7. 4. For renewal, enter your current lender's renewal rate, the competing lender's rate, and any one-time switch fee.
  8. 5. Click 'Compare Renewal' to see which option is cheaper and the exact switch fee at which both offers cost the same.

Frequently asked questions

How does the tool calculate the monthly rate for my mortgage?

It uses the rate compounding semi-annually as required by Canada's Interest Act, then converts that to an equivalent monthly rate. It does not simply divide the annual rate by 12.

What happens if I enter an extra payment that exceeds my prepayment privilege?

The tool caps the applied extra payment at your annual privilege (a percentage of the original principal) and clearly shows how much of your payment is actually applied versus the excess that would not be allowed.

Does the tool store or transmit my entered data?

No. All calculations happen locally in your browser. Your mortgage amounts, rates, and fees are never sent to a server or saved.

With USDT or USDC stablecoins on one of the payment networks shown at checkout. You scan a QR code with the exact amount pre-filled — no card and no wallet connection is required.
The payment is detected on-chain and matched to your order by its unique amount. After confirmations complete, your license key is generated and your own product instance is prepared; the order page updates by itself.
No. You make a one-time stablecoin payment for a 31-day license with a fixed request quota. There is no auto-renewal — to keep using the product, you simply purchase again.
Each plan includes a fixed number of requests for the license period. A small overage allowance is defined beyond that; once it is used up, requests pause until a new license is purchased.
Yes. Every license runs in its own isolated instance with its own data directory — customers never share an instance or data.
On-chain payments are never lost. Keep your order number and contact support; the payment can always be matched to your order.
Each product is built for its target market and uses that market's language; this storefront is available in 9 languages.

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