A closed mortgage locks you into a lower rate in exchange for prepayment restrictions. An open mortgage removes those restrictions and charges a premium for it, typically 1.5% to 2.5% higher. Almost every mortgage in Canada is closed; open terms are a short-term tool, not a default choice, and treating the two as interchangeable is where most of the cost in this decision gets missed.
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Why This Distinction Matters More Than the Label Suggests
"Open" and "closed" sound like a simple binary, but the decision behind them is really a bet on timing. A closed mortgage bets that your circumstances won't change materially before the term ends. An open mortgage is priced for the opposite bet, that something will change, and you're paying up front for the right to react without penalty.
Most borrowers default to closed without running the numbers, and for most borrowers that's the right instinct: the discount on the rate is real, and prepayment privileges built into standard closed terms cover more flexibility than people assume. The cases where that default is wrong are specific and identifiable, which is exactly what the rest of this article covers.
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What Is a Closed Mortgage?
A closed mortgage fixes the rate and terms for the length of the term you sign. Most lenders still build in some prepayment room, a common structure is 10% - 20% of the original principal per year plus the right to increase your regular payment by 10% - 15%, but anything beyond that, or breaking the mortgage entirely before maturity, triggers a penalty.
How the penalty is calculated: For fixed-rate closed mortgages, the penalty is the greater of three months' interest or the interest rate differential (IRD), which is the gap between your contracted rate and the rate the lender could charge today for the remaining term, applied to your outstanding balance. For variable-rate closed mortgages, it's a flat three months' interest, which makes variable easier to break but doesn't mean it's free.
A worked example: on a $500,000 balance with two years remaining at 4.5%, if current rates for a comparable two-year term have dropped to 3.5%, the IRD calculation applies that 1% gap across the remaining term and balance, which can produce a penalty in the tens of thousands of dollars. Three months' interest on the same balance, by contrast, runs closer to $5,600. The IRD is almost always the larger number when rates have fallen since you signed, which is precisely when borrowers are most tempted to break their mortgage and refinance lower.
Closed is the default for a reason. The rate discount is real, and most borrowers never use their full prepayment privileges anyway. It's the right structure if you're not planning to sell, refinance, or make outsized lump-sum payments before the term ends.
What Is an Open Mortgage?
An open mortgage can be paid down or paid off in full at any time with no penalty. That flexibility costs more, often 1% - 2.5% over a comparable closed rate, and it shows up in the payment: on a $400,000 mortgage over 25 years, the gap between a closed and open rate can run several hundred dollars a month.
BNQ Financial offers open mortgage terms directly as a private lender. As a real estate financing platform structuring both conventional and private capital under one roof, we assess open-term deals the same way we assess every other product on the platform, on the deal's merit, not against a fixed checklist, which makes an open term a live structuring option, not a workaround you have to find elsewhere.
Open terms are built for a narrow set of situations, not as a standing strategy:
- A sale is in progress but won't close before maturity. An open term buys you a few months without exposing you to a fresh penalty when the sale closes. Renewing into a new closed term instead would expose you to a full penalty the moment the sale funds arrive.
- A large lump sum is coming — inheritance, bonus, sale proceeds, a business distribution, that exceeds what a closed mortgage's prepayment privileges allow. Rather than paying a penalty to apply it early, an open term lets the full amount go straight to principal.
- You need short-term breathing room, typically three to six months, before locking back into a closed rate once the timing settles, a refinance mid-process, a pending appraisal, a property sale on a different timeline than your mortgage maturity.
- You're mid-transition on a complex file — a self-employed borrower waiting on updated financials, a newcomer borrower building credit history, a property under a value-add plan ahead of a conventional refinance, where a short open term bridges the gap without locking in a structure that no longer fits once the file resolves.
Outside those cases, the cost of the flexibility usually outweighs the benefit of having it. Open terms are also structurally short, most run six to twelve months, because they're priced as a bridge, not a destination.
Closed vs Open: The Trade-Off at a Glance
| Closed | Open | |
|---|---|---|
| Rate | Lower | Higher (typically +1.5–2.5%) |
| Prepayment | Limited (often 15% principal / 15% payment increase per year) | Unlimited, any time |
| Early payout | Penalty (greater of 3 months' interest or IRD on fixed) | No penalty |
| Typical term length | 6 months to 10 years | Usually 6–12 months |
| Best for | Staying the course through the full term | A defined, short-term transition |
How to Choose: A Decision Framework
Four questions, in order, decide it in most cases:
- Will you need to break the mortgage or pay it off early, on a known timeline? If the answer is no, or the timeline is vague, closed almost always wins on cost.
- Does the prepayment room on a closed term already cover what you plan to put toward it? If your extra payments fit inside a 10% - 20% of principal, or the 15% payment increase per year, you're paying an open premium for flexibility you don't need.
- Is the rate gap smaller than the penalty you'd otherwise pay? This is the actual comparison, not a rule of thumb, run the IRD or three-months'-interest calculation against the extra interest an open term would cost over your expected holding period.
- Is the timeline genuinely short? Open terms are priced for months, not years. If the flexibility you need extends past six months, a short closed term is usually the more efficient structure than an open one.
The Renewal Trap: Where the Wrong Term Costs You Later
Term structure isn't just today's decision, it sets up what happens at renewal. Borrowers who lock into a closed term without a clear exit plan are the same borrowers who end up facing an expensive renewal or a forced sale when the term matures and their financial position hasn't improved, a pattern we've written about in detail. An open term chosen deliberately, for a defined transition, avoids that trap by design. A closed term chosen without thinking through the maturity date walks straight into it. The structuring conversation at the start of the mortgage is the cheapest place to solve this problem, far cheaper than solving it at renewal.
What This Means Depending on Where You Sit
For Level 2 agents: clients ask about open terms most often mid-sale or mid-windfall, rarely as a first choice, and rarely with the IRD math already done. Because BNQ Financial structures open terms directly as a platform, this is a deal you can submit and get a term sheet in 24 hours rather than route to a second lender, it gets assessed on the same deal-by-deal basis as any other complex-profile submission. Flagging the timeline explicitly on submission (sale pending, lump sum expected, bridge-to-refinance) speeds up how the file gets structured.
For commercial borrowers: the open/closed frame rarely applies cleanly to commercial financing, most commercial terms are structured around the deal itself (bridge, construction, stabilization, land) rather than a binary open/closed choice. What matters is whether the term matches your exit. A construction loan with a maturity date that doesn't line up with lease-up or a sale creates exactly the same problem an open mortgage solves for a homeowner, just at commercial scale. BNQ Financial's commercial team structures around that exit from the initial discussion, across multifamily, CMHC-insured, bridge, stabilization, and land and construction financing, discuss your deal and get a term sheet in 7–10 business days.
For direct borrowers: if you're weighing an open term against a closed one, the real question isn't just rate, it's whether your lender can actually structure either, on the same platform, without pushing you toward a product they want to sell. BNQ Financial does both, alongside first and second mortgages, bridge loans, and equity take-outs, assessed on your actual situation rather than a fixed product menu.
Frequently Asked Questions
Is an open mortgage ever cheaper than a closed one?
Rarely on rate, open rates run higher. It becomes cheaper in total cost only when the prepayment penalty you'd otherwise pay on a closed mortgage exceeds the extra interest from the open rate over your expected holding period.
Can I switch from a closed mortgage to an open one?
Only by paying the prepayment penalty to break the closed term, or waiting until it matures. Converting the other way, open to closed, is usually penalty-free, and most lenders make it straightforward.
Does BNQ Financial offer open mortgages?
Yes. As a private lender operating across residential and commercial financing, BNQ Financial structures open terms deal-by-deal alongside closed terms, first and second mortgages, bridge loans, and equity take-outs, one platform, assessed on the deal rather than a fixed product menu.
How long do open mortgage terms usually last?
Most are short, six to twelve months. Anything you'd need open flexibility for beyond three to six months is usually discussed on a case by case basis.
Why is the penalty on a closed mortgage sometimes much larger than three months' interest?
The interest rate differential (IRD) applies whenever current rates for your remaining term are lower than your contracted rate. The bigger that rate gap, and the more time left on your term, the larger the IRD, which is why breaking a closed mortgage early can cost far more than the flat three-months'-interest penalty on a variable-rate mortgage.
Does an open term make sense if I'm not sure exactly when I'll need the flexibility?
Not usually. Open terms are priced for a defined, short window, a known sale date, a known lump sum, a known refinance timeline. If the timing is genuinely uncertain, the cost of the open rate compounds without a clear payoff, and it's worth structuring the conversation around what would need to be true for a closed term's prepayment privileges to be enough instead.
Can a closed mortgage's prepayment privileges be enough for most borrowers?
Yes, for most. Standard 10% - 20% of principal, or the 10% - 15%-payment-increase privileges cover far more flexibility than the average borrower ends up using, the gap between what's allowed and what's actually used is one of the more underappreciated numbers in mortgage planning.
This article is for informational purposes only and doesn't constitute financial, legal, or investment advice. Financing terms, rates, and approval outcomes are assessed on a deal-by-deal basis and aren't guaranteed. BNQ Financial Corp. is a licensed Ontario mortgage brokerage, FSRA Licence #13618.