Every mortgage is a contract about leaving early. Some exits are free. Some are priced. The price is called a pre-payment penalty, and how it is calculated varies between lenders more than the rates do. Here is the fine print, translated.
First, the free exits: your privileges
Most closed mortgages include generous pre-payment privileges — ways to pay extra without any penalty:
- Lump-sum payments. Most lenders allow 10–20% of the original amount per year, straight against the balance. Bonuses, tax refunds, inheritances — this is where they do the most good.
- Payment increases. Raise your regular payment by 10–20% (some lenders allow doubling). It quietly cuts years off the mortgage.
- Accelerated bi-weekly payments. Paying half your monthly amount every two weeks sneaks in one extra monthly payment a year. That alone trims years off a typical mortgage.
Open vs. closed mortgages
An open mortgage can be fully repaid any time, penalty-free — and you pay for that freedom with a clearly higher rate. It suits short, known situations: a house about to be sold, an inheritance in probate.
A closed mortgage is everyone else's mortgage: lower rate, fixed term, and a penalty if you break it early. Closed is not a trap — the trap is not knowing which kind of closed you signed.
How the penalty is calculated
For variable rates, it is simple: three months' interest. For fixed rates, the lender charges the greater of three months' interest or the IRD — the interest rate differential. IRD is the gap between your rate and the rate the lender could charge today for your remaining time, applied to your balance.
A worked example:
- Balance at breakage: $400,000, contract rate 5.4%, two years left.
- Lender's comparison rate for a 2-year term: 3.9% → the gap is 1.5%.
- IRD: $400,000 × 1.5% × 2 years = $12,000.
- Three months' interest: $400,000 × 5.4% × ¼ = $5,400.
- Penalty charged — the greater of the two: $12,000.
Now the important part: some lenders use their posted (inflated) rates in that comparison instead of real ones. The same numbers can push the gap past 2.5% — a $20,000+ penalty on the identical mortgage. The lender you choose today decides the exit price you would pay in three years.
What this means for you
Three practical rules:
- If there is any real chance you will sell, separate, or relocate mid-term, the penalty formula matters as much as the rate. Choose the lender accordingly.
- Before breaking a term, use your free privileges first — a lump-sum payment before the break shrinks the balance the penalty is calculated on.
- Never sign a break before seeing the lender's written payout statement. The estimate on the phone is not the number.
Where this comes up most: refinancing mid-term, and deciding whether to leave your lender at renewal (where, at maturity, there is no penalty at all).
Quick answers
Variable or fixed — which has smaller penalties?
Variable, almost always: the penalty is three months' interest, simple to calculate. A fixed-rate penalty can be the same — or it can be an IRD several times larger, especially with lenders that use posted rates. If there is a real chance you'll break the term early, penalty math belongs in the product choice, not just the rate.
What is a 'bona fide sale' clause?
A restriction on some deep-discount mortgages: you can only pay the mortgage out if you genuinely sell the property. No refinancing your way to another lender mid-term. It's an acceptable trade for some people — and a nasty surprise if nobody flagged it before signing.
Can a penalty be negotiated?
Rarely head-on — the formula is in the contract. But there are side doors: lenders may fold the penalty into a new term to keep your business, porting can carry your rate to a new property, and breaking close to your renewal date shrinks the number naturally.
Do pre-payment privileges reset every year?
Usually yes, on a calendar or anniversary basis — but unused room typically does not carry forward, and a few lenders only allow lump sums on payment dates. If a windfall is coming, a five-minute check of your exact wording can save a five-figure mistake.