Nine Mortgage Renewal Mistakes That Cost Canadians Thousands

Roughly 1.2 million Canadian mortgages come up for renewal every year, and the same handful of mistakes gets repeated across an astonishing share of them. None of these errors requires bad luck — every one is avoidable with a little lead time and a calculator.

Here are the nine that cost the most, roughly in the order people commit them.

1. Treating the Renewal Letter as the Offer

The letter that arrives from your lender is an opening position priced for people who don't shop — typically 0.30–0.75% above what the same lender will accept from a customer holding a competing quote. Signing it as-is on a $400,000 balance can cost $6,000–$15,000 over a five-year term.

The fix costs three phone calls: one to a broker for an outside quote, one to your lender's retention desk with that quote, one to accept whoever wins. Scripts are in our negotiation guide.

2. Starting Too Late

Every renewal power move — collecting quotes, holding rates, negotiating in rounds, executing a switch — needs runway. Start six months out and all options are open; start two weeks out and your only realistic option is the letter. Lenders' retention desks visibly firm up their pricing as your maturity date approaches, because they can see your alternatives dying on the calendar.

The timeline that preserves your leverage is in the 120-day rule guide. The one-sentence version: put a reminder in your calendar six months before maturity, today.

3. Letting the Mortgage Auto-Renew

Ignore the letters entirely and most lenders roll you into a short term — often six months — at their posted rate, which can sit one to two full percentage points above market. On $400,000, six months of posted-rate drift costs $2,000–$4,000, and plenty of auto-renewed borrowers don't notice for far longer than six months.

If life circumstances mean you genuinely can't deal with the renewal right now, even fifteen minutes on the phone accepting your lender's discounted offer beats the auto-renewal default. Bad beats worst.

4. Assuming You Can't Switch

For years, the stress test meant many borrowers couldn't qualify to move their mortgage, and banks priced renewals accordingly. That world ended in November 2024: uninsured straight switches — same loan amount, same amortization, new federally regulated lender — no longer require re-qualifying at the stress-test rate. Insured mortgages already had this treatment.

If you've been telling yourself you're stuck at your bank, verify it against the current rules before paying the loyalty tax again. Details in the switching guide.

5. Shopping the Rate but Not the Product

Two mortgages at the same rate can differ by thousands in real cost. The fine print that matters: prepayment privileges (10% vs 20% annual lump-sum room — the difference compounds if you're an aggressive prepayer), penalty method (big-bank IRD formulas versus a monoline's gentler calculation can differ by five figures if you break mid-term), portability (can the mortgage move with you to a new home?), and registration type (collateral charges can complicate future switching).

If there's any real chance you'll sell, refinance, or prepay heavily during the term, the product terms may matter more than a 0.05% rate difference. Our prepayment penalty guide shows how brutal the wrong penalty clause gets.

6. Renewing Into the Wrong Term by Default

Five-year fixed is the default Canadian choice, and defaults are chosen by habit, not analysis. Renewing into five years of fixed money makes sense if you're staying put and value certainty — and it's a quietly expensive mistake if you're likely to sell in year two, when breaking that term triggers an IRD penalty.

Match the term to your actual horizon: shorter fixeds or a variable for flexible plans, five years for stability. The renewal-specific version of the fixed-vs-variable decision — which is genuinely different from the one you made as a buyer — is in Fixed or Variable at Renewal?

7. Ignoring the Amortization Reset

Renewal quietly re-anchors your amortization, and two versions of this mistake run in opposite directions. Some borrowers coming off fixed-payment variables discover their effective amortization stretched during the rate hikes, and accept a payment reset without checking the schedule they're being reset onto. Others let a lender casually re-extend them ("we can take you back out to 25 years to keep the payment comfortable") without registering that they're adding years of interest — and that extending amortization converts a simple renewal into a refinance, stress test included.

Before signing, ask one question: "What amortization is this payment based on?" Then decide the number deliberately. Shortening from 20 to 17 years on $350,000 at 4.3% raises the payment about $230/month and saves roughly $25,000 in interest. That trade should be made on purpose, in whichever direction — model it in the mortgage calculator.

8. Missing the Prepayment Window

Most mortgages allow a 10–20% penalty-free lump-sum prepayment each year, and renewal eve is the single best moment to use it: every dollar paid down before renewal is a dollar that doesn't get financed at the new rate for another five years. Renewers sitting on idle savings who skip this step are financing money they didn't need to borrow.

Even $10,000 prepaid on the eve of a 4.3% renewal saves about $2,100 in interest over the following five years alone — more over the full amortization.

9. Never Asking Whether the Mortgage Still Fits

The renewal is a free checkpoint on your whole housing setup, and most people waste it. Income up since last term? Consider shortening the amortization or raising payments 10%. Carrying expensive consumer debt? Renewal is the cheapest moment to consolidate — compare against a blend or HELOC honestly. Struggling to make the current payment? You have far more options five months before maturity than one missed payment after it; see renewing under financial hardship. Thinking of selling within the term? That changes the right term and product entirely.

The lender's letter asks one question: "same mortgage, new rate?" The better question is "is this still the right mortgage?" — and only you will ask it.

The Pattern Behind All Nine

Read the list again and one cause repeats: defaulting. Signing the default letter, in the default month, at the default term, on the default amortization, without the default hour of shopping. Renewal mistakes aren't mostly analytical failures — they're attention failures, which is good news, because attention is free.

Six months before your maturity date: one calendar reminder, one broker call, one retention call, one hour with the mortgage calculator. That routine, repeated every term, is worth more per hour than nearly anything else in your financial life.