Mortgage Lump-Sum Payment in Canada: What $10,000 Really Saves
A lump-sum payment on your mortgage cuts the interest you pay for every month that remains. How much it saves depends on when you pay it, and how much you can pay depends on your lender’s yearly limit.
- Rules checked November 10, 2026
- By Krish Paul
- 7 min read
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This guide works through the numbers on a $500,000 mortgage and shows the prepayment limits at four big banks.
The short answer
On a hypothetical $500,000 mortgage at 4.5% with a 25-year amortization, a $10,000 lump sum paid after the first year saves about $18,595 in interest and removes about 10 monthly payments, as long as your regular payment stays the same. The same $10,000 saves less the later you pay it, because there are fewer months left for it to save interest on.
Most closed mortgages let you prepay part of the original principal each year without a penalty. The Financial Consumer Agency of Canada (FCAC) calls this a prepayment privilege and says it varies from lender to lender. Go over it and you can be charged a prepayment penalty.
What would your lump sum save?
Enter your current balance, your rate, the years left on your amortization and the lump sum. The result updates as you type.
Your monthly payment of $2,767 stays the same, so the lump sum shortens your amortization instead of lowering the payment.
Assumes a fixed rate compounded half-yearly, monthly payments, the lump sum paid today and no other prepayments. Your statement may differ by a few dollars. Calculator by Gizly.
How a lump-sum payment saves you money
Your mortgage charges interest on the balance you still owe. A lump sum goes against that balance, so every later payment carries less interest and more principal. If your payment stays the same, the mortgage ends sooner. The months you no longer pay are where the saving comes from.
The federal Interest Act requires a blended-payment mortgage to state its rate “calculated yearly or half-yearly, not in advance.” Our example uses half-yearly, one of the two options the Act allows.
The worked example
- Original mortgage: $500,000, 25-year amortization, 4.5% fixed, monthly payments.
- Monthly payment: $2,767.36. Over 25 years, total interest would be about $330,209.
- Balance after 12 payments: $488,857.68.
- Lump sum: $10,000, paid right after the 12th payment. The monthly payment does not change.
Result: the mortgage ends about 10.3 months early, and lifetime interest drops by about $18,595. That is $1.86 of interest saved for every dollar you prepaid, spread over the next 24 years. Within the current 5-year term, the saving is $1,948 in interest, and your balance at renewal is $11,948 lower than it would have been.
Hypothetical example. The 4.5% rate is an assumption for illustration, not a quote from any lender.
Timing matters more than most people think
A prepayment saves interest on every month left in the amortization. Early in a mortgage, there are many months left and the balance is large. Twenty years in, there is far less interest left to save.
Here is the same $10,000 paid at four points in our example mortgage:
- After year 1: saves about $18,595 and 10.3 monthly payments.
- After year 5: saves about $14,007 and 8.7 monthly payments.
- After year 10: saves about $9,279 and 7.0 monthly payments.
- After year 20: saves about $2,411 and 4.5 monthly payments.
Bigger prepayments scale up. In the same example, prepaying $10,000 a year for the first five years saves about $72,903 in interest and cuts about 44 months. A single $50,000 prepayment after year 1, the most RBC’s 10% privilege would allow on this loan, saves about $83,136.
How much your bank lets you prepay
Each lender sets its own limit, usually as a percentage of the original principal. Here is what four big banks publish for their standard closed mortgages.
| Bank | Yearly lump-sum limit | Most you could prepay on $500,000 | Payment increase allowed |
|---|---|---|---|
| RBC | 10% of original principal | $50,000 | Up to double the regular payment |
| CIBC | 10%, 15% or 20%, by product | $50,000 to $100,000 | Up to 100% of the original payment |
| Scotiabank | 15% of original principal | $75,000 | Up to 15% of the current payment |
| BMO | 20% of original amount | $100,000 | Up to 20% of the current payment |
Sources: each bank’s own mortgage pages, checked November 10, 2026. BMO’s figures are for closed mortgages other than its Smart Fixed Mortgage, which allows 10%, and BMO sets a $100 minimum per lump sum. Other products at each bank can have different limits.
The FCAC adds two rules of thumb that matter for planning. First, “you can’t carry a prepayment amount from one year to the next” in most cases, so unused room is usually lost. Second, at the end of your term you can make a lump-sum payment as part of renewal.
What happens if you go over the limit
Paying more than your privilege allows can trigger a prepayment penalty. The FCAC says the penalty is usually the higher of 3 months’ interest on what you still owe or the interest rate differential (IRD). Our guide to the mortgage prepayment penalty shows how the IRD is worked out. If you have more cash than your privilege allows, it is often cheaper to wait for renewal and pay the rest then.
The trade-offs before you prepay
A prepayment is a guaranteed saving at your mortgage rate. Every dollar you prepay stops costing you 4.5% a year in our example. But it has costs that do not show up in the interest number.
The money is hard to get back
Once you prepay, the cash is in your home. Getting it out usually means borrowing again, through a home equity line of credit or a refinance. Our guide to how much you can borrow with a HELOC explains the limits. Build your emergency fund first.
Higher-interest debt comes first
Any debt charging more than your mortgage rate, such as a credit card balance, costs more per dollar than the mortgage does. Paying it off first saves more. The debt avalanche method ranks debts by rate for this reason.
Your payment usually stays the same
A lump sum normally shortens the amortization rather than lowering your monthly payment. If you need lower payments, ask your lender what your options are. The FCAC also notes that once you increase your regular payment, you normally cannot lower it until the end of the term.
Check these before you send a lump sum
- Your privilegeFind the yearly limit and the reset date in your mortgage contract or your lender’s app.
- Your safety netKeep enough cash to cover a few months of expenses outside the mortgage.
- Your other debtsPay off anything charging more than your mortgage rate first.
- Your renewal dateIf renewal is close and you want to pay more than the limit, waiting may avoid a penalty.
How to make a lump-sum prepayment
- Find your limit. Look for the prepayment privilege in your mortgage contract. Note whether it is based on the original principal and whether it resets each calendar year or on your mortgage anniversary.
- Check what you have used. Add up any lump sums and payment increases you have already made this year.
- Run your numbers. Use the calculator above with your balance, rate and years left.
- Pay through your lender. Most banks accept prepayments online, by phone or at a branch. Keep the confirmation.
- Confirm it went to principal. Your next statement should show the lower balance and the same or shorter amortization.
Frequently asked questions
How much does a $10,000 lump-sum payment save on a mortgage?
In our hypothetical example, a $10,000 lump sum paid after the first year of a $500,000, 25-year mortgage at 4.5% saves about $18,595 in interest and removes about 10 monthly payments, if the regular payment stays the same. Paid after year 10, the same $10,000 saves about $9,279.
Can I make a lump-sum payment on a closed mortgage?
Yes, up to your prepayment privilege. Most closed mortgages let you prepay a set share of the original principal each year without a penalty. Among the big banks we checked, the limit ranges from 10% to 20% depending on the bank and product.
Do unused prepayment privileges carry over to the next year?
Usually not. The Financial Consumer Agency of Canada says you typically cannot carry a prepayment amount from one year to the next, so room you do not use in one year is normally lost.
What happens if I prepay more than my limit?
You can be charged a prepayment penalty. The FCAC says the penalty is usually the higher of 3 months’ interest on what you owe or the interest rate differential. Check your mortgage contract before paying more than the allowed amount.
Does a lump-sum payment lower my monthly payment?
Usually not by itself. In most cases the regular payment stays the same and the lump sum shortens your amortization, which is where the interest saving comes from. Ask your lender how it applies a prepayment.
Is it better to make a lump-sum payment early in the mortgage?
Yes, if you have the money and no higher-interest debt. A prepayment saves interest for every remaining month, so the earlier it goes in, the more it saves. In our example, $10,000 paid after year 1 saves about twice as much as the same amount paid after year 10.
- Sources, checked November 10, 2026: FCAC: Paying off your mortgage faster (modified 2025-10-15); FCAC: Mortgage fees, prepayment penalties (modified 2025-10-15); Interest Act, R.S.C. 1985, c. I-15, current to 2026-10-19, section 6; RBC: Mortgage prepayment; CIBC: What are mortgage prepayment charges?; Scotiabank: 3, 4, 5, 7 and 10 year closed term; BMO: Pay off your mortgage faster.
- Method: All figures were computed in Python with a monthly rate of (1 + 0.045/2)^(1/6) minus 1, and checked twice: once with a month-by-month amortization schedule and once with the closed-form formula for the number of remaining payments. The two methods agreed within $2. The calculator uses the closed-form method.
Important: This guide is general information, not financial or legal advice. Prepayment terms vary by lender and product, and your mortgage contract is what applies. Gizly is not paid by any bank mentioned here. See our affiliate disclosure.
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How this page was made: Gizly uses AI tools to help research and draft its guides. Krish Paul, the editor, is responsible for what Gizly publishes. Spot an error? Tell us and we will fix it.
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