Housing · Canada
Mortgage prepayment privileges in Canada: how to cut interest without triggering penalties
Owners either ignore prepayment room or send a heroic extra payment and meet an interest-rate differential. Both mistakes cost shelter money. Privileges exist so you can cut principal inside the contract. The penalty exists so you cannot refinance the lender’s book for free. The playbook is: read the percentage, stay inside it, track the interest you actually avoided.
This is housing-cost education, not a rate call. Shop the privilege the same day you shop the rate — the renewal scorecard already has a row for it.
Disclosure: Mortgage-rate comparison tools are an offer type. Saving Optimizer may earn a commission if we later add partner links. We do not currently claim lender or broker partnerships. This is comparison education, not brokerage, credit, or legal advice.
Key takeaways
- Most closed Canadian mortgages allow a yearly lump-sum (often 10–20% of original principal) and a payment increase (often 10–20%). Read your commitment.
- Going over the privilege on a fixed term can trigger IRD; variables are often three months’ interest. Get a written penalty quote before you wire extra.
- A labelled $10,000 year-1 lump on a $400,000 / 4.50% / 25-year sketch trims several thousand dollars of lifetime interest if the rate path holds — not a quote.
- Privilege percentages often reset at renewal. Ask whether the % is of original or current balance.
- Do not skip the emergency fund to “save interest” you will re-borrow on a card at 20%.
Common privilege structures (annual %, increased payment)
Closed-mortgage commitments in Canada commonly allow, each year of the term:
- A lump-sum prepayment of about 10%, 15%, or 20% of the original principal (sometimes of the current balance — ask).
- An increase to the regular payment of about 10–20%, which you can often decrease later within rules.
- Accelerated weekly or biweekly as a payment-timing choice, not always a “privilege,” but it behaves like a small ongoing prepay.
Open mortgages let you pay extra more freely and cost more in rate. Portable and assumable language is a different clause. Do not paste a bank blog’s “20%” onto a credit-union letter that says 10%.
Lump-sum vs payment-increase strategies
A lump-sum from a bonus or FHSA leftover (after closing) hits principal once. A payment increase is the boring machine: $2,214 → $2,546 on a 15% bump. The increase usually wins if your income is stable and you will forget to send the annual cheque. The lump-sum wins if cash is lumpy (bonus, inheritance) and you do not want a higher locked payment before a maternity leave. You can often use both in the same year if the letter allows it — confirm stacking, not a forum.
| Move in year 1 | What it does | Watch-out |
|---|---|---|
| $10,000 lump (inside 15% of $400k) | Cuts balance immediately; later interest falls | Do not exceed remaining privilege room |
| +15% payment (~$332/mo) | Steady extra principal | Cash-flow in a thin month |
| Accelerated weekly | Roughly one extra monthly payment per year | Payday timing vs NSF risk |
| $80,000 extra on a 15% privilege | Likely a penalty conversation | IRD or 3-month interest |
Variable vs fixed penalty basics (high-level)
If you break the mortgage or exceed privileges, consumer explainers and the fixed vs variable page use this map: variable products are often three months’ interest on the outstanding balance; fixed products are often the greater of three months or IRD using the lender’s comparison rate. IRD is where “I’ll just dump the inheritance in” dies. Get the penalty in writing before the wire. This paragraph is a map, not your lender’s formula.
When to prepay vs invest surplus (light Housing framing: shelter cost)
Housing lens, not a portfolio lecture: if the mortgage rate is 4.50% and a high-interest unsecured card is 20%, the card is the prepay. If the emergency fund is under three essential months, the fund is the “prepay.” If you have surplus inside privilege room and no higher-interest debt, extra principal is a guaranteed cut to shelter interest — with the trade-off that the cash is no longer in a TFSA. We do not pick the mix. We do say: do not skip last-month’s reserve to shave $40 of interest.
Renewal timing and privilege resets
Many lenders reset the annual privilege clock on the anniversary or on the renewal date. Unused room often does not roll forever. A 120-day renewal shop is when you ask: what % next term, original vs current balance, and whether a cashback clawback applies if you prepay hard in year one of a new term. OSFI’s 21 Nov 2024 uninsured straight-switch context does not erase the need to read the new privilege clause.
Track interest saved with a simple schedule
Once a year, write: starting balance, extra principal sent, ending balance vs the original amortization schedule (your annual statement or a spreadsheet). The gap is the interest you did not owe on that extra principal going forward. You do not need a 25-year forecast. You need proof you stayed inside the privilege and that the balance moved.
Mistakes that cause unexpected penalties
- Sending 20% because a blog said “most banks allow 20%” when your letter says 10%.
- Double-counting: lump-sum plus a payment increase that the lender treats as one bucket.
- Prepaying so hard after a cashback that the cashback is clawed back.
- Breaking the mortgage to “refinance cheaper” without an IRD quote.
- Using the entire emergency fund in May and putting June’s roof on a card.
If the goal is a lower payment rather than less interest, that is a different — and often costlier — lever: payment-cut pitfalls.
Sources & date stamps
- Lender and broker consumer pages on Canadian prepayment privileges — 10–20% lump-sum and payment-increase patterns (used 20 Sep 2026; your commitment governs).
- OSFI MQR / 21 Nov 2024 uninsured straight-switch context — renewal shopping, not a privilege formula (see our renewal guide).
- CMHC home-buying consumer hub — high-level mortgage literacy (used 20 Sep 2026).
- Financial Post mortgage-rate coverage — market colour only; not a quote on this page.
Frequently asked questions
What is a mortgage prepayment privilege in Canada?
A contract right to pay extra principal — usually a yearly lump-sum percentage and/or a payment increase — without the full break penalty. The percentage and whether it is of original or current balance are in your commitment letter.
What happens if I prepay more than the privilege allows?
The lender can charge a prepayment penalty on the excess or treat it as a break. Fixed mortgages often use the greater of three months’ interest or IRD. Variables are often three months’ interest. Get the number in writing first.
Is an accelerated weekly payment a prepayment privilege?
It is usually a payment-frequency choice that results in roughly one extra monthly payment per year. It may sit beside, not inside, the lump-sum percentage. Ask how your lender counts it.
Do privileges reset when I renew?
Often yes. Unused room may expire. The next term can have a different percentage. Read the renewal offer; do not assume last term’s 20% is still there.
Is this brokerage advice?
No. Comparison education only. Confirm OSFI, insurer, and lender rules for your mortgage type with a licensed professional.