Example 1 · Variable
Three months’ interest
| Balance | $400,000 |
|---|---|
| Variable rate | 5.50% |
| $400,000 × 5.5% × 3 ÷ 12 | $5,500 |
About 1.38% of the balance. On most closed variable mortgages this is the whole charge, however many months remain.
Bedford Basin
Calculators · Canada & Nova Scotia · last verified 2026-10-03
Mortgage penalty calculator: IRD and three months’ interest
A mortgage penalty calculator for Canada: estimate what it costs to break your mortgage, see both penalty calculations side by side, and check whether refinancing would actually save you money.
How do I calculate my mortgage penalty?
Three months’ interest is balance × your rate × 3 ÷ 12. The interest rate differential is roughly balance × (your rate − a comparison rate) × years left. A closed fixed rate usually charges the greater of the two; a closed variable usually charges three months’ interest. Your contract sets the comparison rate; your lender’s payout statement is final.
$12,000
Simple IRD on $300,000 with a 2-point rate gap and 2 years left
$3,750
Three months’ interest on the same $300,000 at 5.00%
3 methods
Comparison rates lenders use; the calculator lets you pick yours
$0
Penalty at maturity, and usually on an open mortgage
Mortgage penalty and IRD calculator
This interest rate differential calculator works for a mortgage with any Canadian lender. Prepayment penalty, break penalty, discharge penalty and early termination fee are all names for the same charge, and the arithmetic is the same.
An estimate, not a quote. Lenders use different IRD methods, and their rates change. Your lender’s payout statement is the figure that counts. How to get one.
Refinance break-even calculator: is breaking worth it?
The penalty is only half the decision. This compares the interest you would pay over the rest of your term against a new mortgage, then shows the month the savings pay back the penalty and switching costs. The first three boxes fill from the calculator above.
Go deeper
How lenders actually charge it
Fixed, variable and open mortgages
| Mortgage | Typical prepayment charge | Watch for |
|---|---|---|
| Fixed, closed | The greater of three months’ interest and the IRD | The comparison-rate clause; whether privileges apply before the charge |
| Variable, closed | Three months’ interest | Which rate the three months use; a few products differ |
| Open | None for repaying in full or in part | A higher rate, and sometimes a short first period that is closed |
| Term over 5 years | After five years, no more than three months’ interest, for a borrower who is not a corporation (Interest Act, s.10) | The lender’s own wording on how it applies the limit |
On a closed variable mortgage, every one of the six large banks charges three months’ interest, but not on the same rate. RBC, TD and BMO use your rate, Scotiabank your variable or cap rate, and CIBC its prime rate.
An open mortgage can be repaid at any time without a prepayment penalty, according to FCAC, at the cost of a higher rate. Scotiabank charges a $200 administration fee if an open mortgage is paid out in its first year.
Banks, monolines and why the same rate can carry a different penalty
A monoline lender does only mortgages: no branches, no chequing accounts, and most of its lending comes through brokers. Most are not federally regulated: in Nova Scotia they are licensed by the Province as mortgage lenders, while the banks answer to OSFI and FCAC. Who regulates which lender →
Posted rates. Banks publish posted rates that few people pay and then offer a discount. RBC, TD, BMO and Scotiabank publish an IRD that compares your rate with today’s posted rate for the term closest to the time you have left, minus the discount you were given when you signed. CIBC reaches the same place by adding your discount to your rate. National Bank’s published guide compares the posted rate at the start of your term with today’s rate, plus one month’s interest up to $500. Their own examples come out lower in practice, because RBC, BMO and Scotiabank discount the result to present value.
Discounted rates. First National’s Nova Scotia fixed-rate terms compare against its lowest advertised rate for the next shorter term, with no discount added back. Not every monoline works that way: CMLS’s Rate Advantage terms use the published rate minus your original discount, like the banks. Some products add a flat-percentage minimum or allow full repayment only on an arm’s-length sale.
Why two lenders at the same rate can differ by thousands. The penalty is a clause, not a rate. Two 4.29% mortgages can produce $12,600 and $4,290 on the same day (Example 3). The gap grows with the size of the original discount and the months left. Not every bank uses a posted-rate method, and not every monoline avoids one. Read the prepayment section, or have it read, before you sign.
Restricted products. BMO’s Smart Fixed and CMLS’s Rate Advantage allow full repayment in the first years only on a sale to an unrelated buyer at market value (or a refinance with the same lender); a lower rate can come with fewer ways out.
Why people break a mortgage, and ways to pay less
Breaking early is not automatically a good idea. These are the common reasons, each with its usual alternative:
- Selling the property. Ask about porting first, or whether the buyer can assume the mortgage.
- Buying another property. Port and blend, or add a bridge loan until the sale closes.
- Refinancing for a lower rate. Run the break-even above; a renewal may be months away.
- Debt consolidation. Moving debt at card rates can outrun a penalty fast. See the arithmetic.
- Accessing equity or renovations. A HELOC or a second mortgage can leave the first one untouched.
- Separation or divorce, or removing a borrower. Usually a refinance; see spousal buyouts.
- Adding a borrower. Some lenders can add one without breaking the term.
- Investment-property financing, moving lenders, restructuring debt. Compare the penalty with the cost of a second charge or of waiting. See investment property.
Ways to reduce or avoid the penalty
- Use this year’s lump-sum privilege first, if your lender applies it before calculating the charge. Published allowances run from 10% to 20% of the original amount a year: TD 15%, BMO 20% (10% on its restricted product), National Bank 10%, First National 15% in Nova Scotia, CMLS and RMG 20%.
- Increase payments before the payout, where your agreement allows, to reduce the balance the charge is worked out on.
- Port the mortgage to a new home instead of discharging it.
- Blend and extend. Your lender blends your current rate with today’s rate for a new term instead of charging a penalty. FCAC’s example: 5.5% with 24 months left, extended into a new five-year term at 4%, blends to 4.6%. Your lender must tell you how it calculates the blended rate.
- Wait for maturity, or time the switch close to it. The IRD falls as months run off. Many lenders also let you renew early in the last months of a term without a penalty. Ask yours how early.
- Get an official payout statement with the calculation, and check it.
- Negotiate the switch, not the penalty. New lenders often cover appraisal, legal or discharge costs, and some offer cash incentives.
Availability of each depends on your lender and your contract.
Get the official number: your payout statement
Ask your lender for a mortgage payout (discharge) statement for a specific date. When you confirm repayment the lender must give you the applicable prepayment charge, a description of how it was calculated, and the period for which the figure is valid.
A quote can change between the day you ask and the day you pay, because:
- the comparison rate can change whenever the lender moves its rates;
- the balance falls with every payment;
- the months left in the term run down;
- interest accrues daily between payments;
- some lender formulas reference rates on the payout date, not the quote date.
Send the statement and the quote through the form below. We rebuild the calculation against your contract and tell you what the penalty buys you elsewhere.
Costs on top of the penalty, including Nova Scotia’s
- Lender fees. Where a province does not cap it, FCAC says a lender’s discharge fee typically runs from nothing to $400. Some lenders add an administration or reinvestment fee; Questbank’s 2026 schedule, for example, lists $495 to discharge in Nova Scotia (government charges included) and a $300 reinvestment fee.
- Registering the discharge in Nova Scotia. Nova Scotia’s land registry charges $100 to register or record a document, and a discharge of mortgage is a document. The new mortgage is registered too.
- Legal fees for the payout and the new mortgage. On a straight switch, the new lender often covers them.
- Appraisal if the new lender needs one.
- Cashback clawback. If you took cash back, expect to repay part of it. BMO, TD and First National pro-rate it by the months left: on BMO’s published example, $5,000 with 15 of 60 months left means $1,250 back.
- Collateral charges. A mortgage registered as a collateral charge has to be discharged and the new one registered when you switch. FCAC notes every loan secured by that charge, such as a line of credit, must be repaid or moved with it.
- Tax. On your own home, the penalty is not tax-deductible. On a rental or business property, the Income Tax Act treats a prepayment penalty as interest, so part or all of it may be deductible, generally spread over the years it relates to rather than all at once. Ask your accountant.
Sources and method
Definitions and disclosure rules come from the Financial Consumer Agency of Canada, and the five-year limit from the Interest Act. Lender methods come from lenders’ own published prepayment pages, checked October 3, 2026. The calculator’s formulas are unit-tested, including the cases where the IRD is negative, the term is nearly over, or only part of the balance is prepaid.
- FCAC: reduce prepayment penalties
- FCAC: breaking your mortgage contract
- FCAC: Code of Conduct, mortgage prepayment information
- FCAC: discharging a mortgage
- FCAC: renewing your mortgage
- Interest Act, section 10
- Income Tax Act, s.18(9.1)
- RBC: understanding prepayment charges
- TD: what is an IRD
- BMO: mortgage prepayments (PDF)
- Scotiabank: mortgage prepayment charges (PDF)
- CIBC: Atlantic fixed-rate standard charge terms (PDF)
- National Bank: prepayment and indemnities guide (PDF)
- First National: understanding prepayment charges
- CMLS: Rate Advantage standard charge terms, NS (PDF)
- Nova Scotia: land registry fees
FCAC’s own example, for checking: $200,000 at 6.00%, 36 months left, against 4.00%. Three months’ interest is $3,000 and the IRD is $12,000. The calculator gives the same. Covering your area: Halifax, Dartmouth, Bedford and the rest of Nova Scotia.
The formulas, worked
How the penalty is calculated
Simple interest rate differential
Balance × (your rate − comparison rate) × years left
| Mortgage balance | $300,000 |
|---|---|
| Your mortgage rate | 5.00% |
| Comparable rate | 3.00% |
| Difference | 2.00% |
| Time left | 24 months = 2 years |
| Estimated IRD | $300,000 × 2% × 2 = $12,000 |
A simplified version, and the one most bank calculators show. RBC, BMO and Scotiabank say their actual charge discounts the result to today’s dollars, which usually brings it a little lower. National Bank’s guide adds one month’s interest, up to $500. So your lender’s figure can differ either way.
Three months’ interest
Balance × annual rate × 3 ÷ 12
| Mortgage balance | $300,000 |
|---|---|
| Annual rate | 5.00% |
| One year’s interest | $15,000 |
| Three months’ interest | $15,000 × 3 ÷ 12 = $3,750 |
This is three months of interest, not three mortgage payments. A payment also repays principal, so three payments would overstate the charge. Contracts say which rate applies. Usually it is your own rate, but CIBC’s terms add back your original discount, National Bank’s guide uses the posted rate, and CIBC’s variable mortgages use its prime rate. In the last three months of a term, several lenders charge only the interest left to maturity.
Four worked examples
All rates below are illustrative, chosen to show how each method behaves. They are not any lender’s current rates.
Example 2 · Fixed
Simple IRD
| Balance, rate | $400,000 at 5.00% |
|---|---|
| Comparable rate, time left | 3.50%, 24 months |
| IRD: $400,000 × 1.5% × 2 | $12,000 |
| Three months’ interest | $5,000 |
| Greater of the two | $12,000 |
The IRD is $7,000 more than three months’ interest. That gap is the reason the method in your contract matters.
Example 3 · Same mortgage, two clauses
Posted-rate discount vs current rate
| $400,000, 5-year fixed at 4.29% | 36 months left |
|---|---|
| Signed at posted 6.29%, so discount | 2.00% |
| Today’s 3-year posted 5.24% − discount | 3.24% |
| IRD: $400,000 × 1.05% × 3 | $12,600 |
| Against a current 3-year rate of 3.99% instead | IRD $3,600; three months’ interest $4,290 |
| Charged under that clause | $4,290 |
Same balance, rate and time left: $12,600 under the posted-rate clause, $4,290 under the current-rate clause. The difference is $8,310. It comes from a 2.00% discount being subtracted from a posted rate that nobody actually borrows at.
Example 4 · Refinance
Break-even
| $400,000 at 5.49%, 30 months left | Lender’s comparable 4.49% |
|---|---|
| Penalty (IRD; three months’ interest is $5,490) | $10,000 |
| Appraisal + legal and discharge | $1,600 |
| New rate, same 22-year amortization | 4.09% |
| Monthly payment $2,599 → $2,293 | $306 less |
| Interest saved over 30 months | $13,533 |
| Break-even | Month 26 |
| Net savings by the old maturity date | $1,933 |
It pays, barely: 4 months of real savings after month 26. The IRD already recovers most of the gap between 5.49% and the lender’s 4.49%. The saving comes from beating that comparison rate.
Why a broker
Licensed, independent, paid by the lender
- Licensed in Nova Scotia Associate broker 3001134, verifiable on the provincial register
- $0 broker fee On a standard residential mortgage the lender pays, not you
- Banks, credit unions, monolines One application, one credit check, placed with the lender that reads your file best
- Every part of the province Bedford office, remote process: Yarmouth to Sydney, the same four steps
Mortgage penalty questions
What is an interest rate differential?
An interest rate differential (IRD) is a prepayment charge on a closed mortgage, usually a fixed rate. The lender works out the interest left on the remaining term at your rate, works it out again at a comparison rate, and charges the difference. On $300,000 at 5.00% against 3.00% with 24 months left, the simple version is $12,000.
How do I calculate my mortgage penalty?
Work out two numbers. Three months’ interest is balance × your rate × 3 ÷ 12. A simple IRD is balance × (your rate − the comparison rate) × years left. A closed fixed-rate mortgage usually charges the greater of the two; a closed variable usually charges three months’ interest. Your contract names the comparison rate, and only the lender’s payout statement is final.
What is IRD in Canada?
The same thing: the interest rate differential charge that Canadian lenders apply when a closed, usually fixed-rate, mortgage is paid off or prepaid beyond its privileges before the term ends. The Financial Consumer Agency of Canada explains it, but no law sets one formula. Each lender’s mortgage contract defines its own comparison rate and method.
How does a bank calculate IRD?
Many of the large banks compare your rate with today’s posted rate for a term close to the time you have left, minus the discount you were given off the posted rate when you signed. Because that discount is subtracted from a posted rate, the comparison rate can fall well below what the bank would actually lend at, which widens the gap and the charge. The exact method is in your contract.
What is a three-month-interest penalty?
It is three months of interest on the amount you are prepaying, worked out as balance × annual rate × 3 ÷ 12. On $400,000 at 5.50% that is $5,500. It is not three monthly payments: a payment also repays principal, so three payments would be a larger number.
Is IRD or three months’ interest higher?
It depends on rates and time. When the comparison rate is well below your rate and many months remain, the IRD is usually higher. When rates have risen since you signed, or the term is nearly over, three months’ interest is usually higher. A closed fixed-rate contract normally charges whichever is greater, which the calculator shows side by side.
Do variable mortgages have IRD penalties?
Usually not. Most closed variable-rate mortgages in Canada charge three months’ interest. The rate used varies: RBC, TD and BMO use your own rate, while CIBC’s published terms use its prime rate. Check your agreement, because a few products differ.
Can I avoid an IRD penalty?
Sometimes. You can wait for maturity, when there is no penalty. You can port the mortgage to a new home, blend and extend with your lender, or use your annual prepayment privilege first to shrink the amount the charge is calculated on. Which of these you have depends on your contract.
Can I negotiate a mortgage penalty?
The penalty itself is set by the formula in your contract, and lenders rarely waive it. What can move is everything around it. Your lender may offer a blend-and-extend instead. A new lender may cover legal, appraisal or discharge costs. And the timing of your payout can change the months left in the calculation.
Can I port my mortgage?
Many fixed-rate mortgages are portable, meaning the rate, balance and term move to a new home when you sell and buy. Lenders set a window between the sale and the purchase, and the new property and your income still have to qualify. If the new home needs more money, the extra is usually blended at a current rate. Ask your lender before you list.
Should I refinance if I have a mortgage penalty?
Only if the savings beat the penalty plus the costs, inside the time you will keep the mortgage. Use the break-even calculator: if interest saved passes the cost well before your current maturity date, it can make sense. If it barely crosses, or never does, waiting usually wins unless you need the equity or are clearing high-interest debt.
Is my mortgage penalty tax deductible?
On your own home, the penalty is not tax-deductible. On a rental or business property, the Income Tax Act treats a prepayment penalty as interest, so part or all of it may be deductible, generally spread over the years it relates to rather than all at once. Ask your accountant.
Does the penalty decrease as I get closer to renewal?
The IRD usually does, because it is multiplied by the time left. $300,000 at a 2.00% gap costs $12,000 with 24 months left and half that with 12. Three months’ interest only falls as the balance does. At maturity there is no penalty at all.
Can my mortgage penalty change daily?
It can. The balance falls with each payment, interest accrues between payments, the months remaining run down, and the comparison rate moves whenever the lender changes its rates. That is why a lender’s payout statement shows the date the figure is good until.
Do all lenders calculate IRD the same way?
No. There is no single Canadian formula. Lenders differ on the comparison rate (posted minus discount, or a current rate), how they match the time left to a term, and whether they discount the result. Two mortgages at the same rate and balance can carry very different penalties.
Why are bank mortgage penalties sometimes higher?
When a contract compares against a posted rate minus your original discount, the size of the discount drives the result: the bigger it was, the lower the comparison rate and the bigger the IRD. In the worked example on this page that method gives $12,600 where a current-rate comparison gives $4,290, on the same mortgage. It is the clause, not the logo, that decides.
What is a monoline lender?
A lender that only does mortgages. It has no branches, chequing accounts or credit cards, and it lends mostly through mortgage brokers. Some publish penalty methods that compare against their current rates rather than posted rates; First National’s Nova Scotia terms are one example. Others, such as CMLS on one product, use the same posted-minus-discount method as the banks, so each contract has to be read on its own.
Can a mortgage broker tell me my exact penalty?
No. Only your lender can, on a payout statement. A broker can check the method in your contract, rebuild the calculation, spot an error or an outdated comparison rate, and tell you what that penalty buys against the rates available elsewhere.
How do I get an official payout statement?
Ask your lender for a mortgage payout or discharge statement, by phone, online banking or your branch, giving a payout date. When you confirm repayment the lender must give you the applicable prepayment charge, a description of how it was calculated, and the period for which the figure is valid. A lawyer handling a sale or refinance requests one as well.
Is it worth breaking my mortgage for a lower rate?
Only sometimes. The IRD is designed to recover much of the interest the lender loses when you leave, so a lower rate alone often does not pay. It tends to work when you can get a rate below your lender’s own comparison rate, when the term is short, or when you are consolidating high-interest debt. Run the break-even calculator on your numbers.
Can I use home equity to pay the penalty?
Often, yes. On a refinance, the penalty, legal and appraisal costs can be added to the new mortgage, as long as the total stays within 80% of the home’s appraised value and you qualify for the larger balance. Rolling it in avoids paying cash today, but you pay interest on it. The break-even calculator has a box for exactly that.
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