Prepayment planning tool
Estimate Lump-Sum and Extra Payment Scenarios
Estimate how a lump-sum prepayment or extra regular payment may affect your remaining balance, interest cost, and payoff timeline. Results are educational estimates only and should be confirmed with your lender.
How to use this estimate
- Use your current mortgage balance and remaining amortization from a recent statement.
- Confirm prepayment privileges, annual limits, and penalty rules before making extra payments.
- Canadian fixed mortgage rates are commonly quoted with semi-annual compounding; individual lenders may calculate differently.
What to review before making a prepayment
- Making a one-time lump-sum payment.
- Increasing your regular mortgage payment.
- Making extra payments at certain times during the year.
- Switching to an accelerated payment schedule.
- Paying part or all of the mortgage balance before the end of the term.
Disclaimer: This calculator is for educational planning only. It is not financial, legal, tax, or mortgage advice.
Prepayment planning guide
How to Use the Mortgage Prepayment Calculator
This page explains how lump-sum payments and extra mortgage payments may affect interest costs and repayment time. Use it as an educational guide before confirming your prepayment privileges, fees, and contract limits with your lender.
What This Tool Can Help Estimate
Lump-Sum Prepayments
Estimate how a one-time payment may reduce the mortgage balance and future interest when the payment is allowed by your contract.
Extra Regular Payments
Review how adding an amount to each scheduled payment may affect principal reduction over time.
Payment Frequency
Compare monthly, bi-weekly, accelerated bi-weekly, weekly, and semi-monthly scenarios using the same balance and rate assumptions.
Balance Preview
See an estimated balance difference after a selected number of years, using simplified assumptions for planning purposes.
Before Making a Prepayment
- Confirm the annual prepayment privilege in your mortgage contract.
- Ask whether the extra amount is applied directly to principal.
- Check whether exceeding the limit could trigger a penalty.
- Keep enough cash available for emergencies, taxes, repairs, and other obligations.
- Compare the mortgage rate with other higher-interest debts before using extra cash.
Important Limits
The calculator uses simplified assumptions and cannot include every lender-specific rule, fee, compounding convention, payment date, insurance charge, tax amount, or penalty calculation. It does not provide financial advice or a mortgage quote.
Related Renewal Tools
After testing prepayment scenarios, use the Mortgage Renewal Calculator Canada to compare renewal payments and visit the Guides page for related renewal planning topics.
Core renewal guides
Read Our Expert Guides Before Comparing Your Numbers
Start with these four in-depth guides if you are comparing a renewal offer, deciding between fixed and variable rates, preparing to speak with your lender, or checking common renewal mistakes before signing.
How to Negotiate with Lenders at Your Mortgage Renewal
Prepare lender questions, compare written offers, and review fees before accepting a renewal offer.
Fixed vs Variable Rate
Compare payment certainty, rate-change risk, budget planning, and contract flexibility.
5 Mortgage Renewal Mistakes
Use a checklist-style review to avoid common mortgage renewal issues before signing.
How to Compare Mortgage Renewal Offers
Review rate, term, payment amount, fees, prepayment privileges, penalty wording, and portability.
Calculator boundaries
What This Prepayment Tool Cannot Confirm
The prepayment calculator can help estimate scenarios, but several important details depend on the mortgage contract and lender rules.
- Whether your contract allows the exact lump-sum amount or timing you entered.
- Whether a payment is treated as a permitted prepayment or creates a fee, penalty, or administrative condition.
- How your lender applies the payment date, interest accrual, rounding, or remaining amortization.
- Whether using cash for prepayment fits your broader budget, emergency fund, or other financial priorities.
Decision checklist
What Homeowners Often Forget to Check
A prepayment can change the mortgage balance, but the surrounding contract details matter just as much as the amount entered.
Use this as a conversation checklist. It does not replace a personalized review of your written mortgage offer or contract.