What paying off a mortgage with a line of credit actually does
Paying off a mortgage with a line of credit means discharging an amortizing loan and carrying the same balance on a revolving account secured by the same property. You have not reduced your debt. You have changed its shape: a scheduled payment with a fixed end date becomes a minimum payment with no end date, and a balance that fell a little with every payment becomes a balance that stays where you leave it.
The mechanics are ordinary. A lender advances funds from a secured line, those funds discharge the existing mortgage, and the lender registers or maintains a charge on the home. The account then behaves like a line of credit: you can draw on it, repay it, and draw again. Whether that helps or hurts turns on what you do with the flexibility.
Rates are the first thing people compare. The Bank of Canada publishes the policy interest rate, the prime rate, conventional mortgage rates and Government of Canada benchmark bond yields, and you can follow them at the Bank of Canada's rates page. Those are benchmarks, not offers, and no lender is obliged to lend at them. A line priced off prime moves when prime moves, so a comparison made today is not the one that applies later.
Why using a home equity line of credit to pay off a mortgage shifts risk onto your home
Both a mortgage and a secured line are secured by the property, so the home was collateral either way. The difference is how the debt behaves when something goes wrong.
A mortgage is designed to end. Each payment reduces the principal, so the amount exposed to the property shrinks over time even if your income stays flat. A revolving line, especially one paid interest-only, does not shrink. If you pay only the minimum, the balance does not fall on its own; it can stay level or grow. That keeps the full amount at risk for as long as the account is open.
Payment shock is the second part. A variable rate line re-prices as prime changes, and a lender can change the required payment accordingly. A mortgage payment can change too, but the amortization schedule absorbs part of the movement. On a line, the full effect lands on your cash flow.
The third part is conduct. When you retire the mortgage, you free up a large monthly payment. If the freed cash goes into the line, you can pay the balance down faster than the mortgage schedule allowed, because a line typically has no fixed amortization and often no prepayment charge. If the freed cash goes elsewhere, you have extended the life of the debt and kept the house as collateral for longer.
Comparing the routes side by side
| Route | What happens to the debt | Payment behaviour | What mainly decides the outcome |
|---|---|---|---|
| Keep the mortgage as-is | Stays an amortizing loan with a scheduled end date | Scheduled payment, principal falls on schedule | Your budget discipline and the rate you already hold |
| Pay off mortgage using line of credit | Same balance moves to a revolving secured account | Minimum payment, often interest-heavy; balance can sit flat | Whether you keep paying the old mortgage-sized amount into the line |
| Refinance into a new mortgage | New amortizing loan, usually a new term and rate | Fixed or variable scheduled payment | Prepayment charges on the old mortgage and underwriting at the new rate |
| Blend and extend with the current lender | Remaining mortgage combined with new money at a new rate | Scheduled payment continues | Lender policy, your equity position, and the blended rate |
| Sell and downsize | Debt is discharged from sale proceeds | No ongoing payment | Transaction costs, timing and where you live next |
The table is deliberately about behaviour rather than price, because price is the part you can see and behaviour is the part that decides the result. A lower rate on a revolving account you never pay down can cost more over time than a higher rate on a loan that amortizes on schedule.
When it is a strategy and when it is a cure
Using a home equity line of credit to pay off mortgage debt is a strategy when the debt is already manageable and the swap is used for a defined purpose: smoothing uneven income, funding a renovation while keeping one secured account, or consolidating a smaller higher-cost balance while keeping total secured borrowing inside the limits the lender applies. The plan is written down, the payment into the line is at least what the mortgage payment was, and there is a target balance and a target date.
It is a cure attempt when the mortgage payment itself has become unaffordable. In that case, extending the repayment horizon does not fix the shortfall; it postpones the point where the shortfall shows up. Moving unaffordable secured debt onto a revolving account can make the monthly number smaller while raising the total cost and keeping the home fully exposed.
The lowest rates are only available to the most qualified applicants.
If the real problem is that income has dropped or debts have grown past what you can service, a line of credit is the wrong instrument. Options in that situation include talking to the existing lender about a modified payment schedule, credit counselling, or a formal insolvency process; only a licensed insolvency trustee can administer a consumer proposal or bankruptcy. A consumer proposal stays on a credit report for 3 years after completion, or 6 years from filing, whichever comes first, and a first bankruptcy stays on a credit report for 6 years after discharge. Equifax Canada and TransUnion Canada each maintain a file on you and may report differently.
What lenders look at before they agree
At federally regulated lenders, a home equity line of credit is generally limited to 65% of appraised property value, with total secured lending usually capped at 80%. That means the room available to retire a mortgage is not simply the equity in the house; it is the equity the lender is willing to secure, measured against an appraisal.
Income testing matters as much as equity. Federally regulated mortgage lenders generally work to a total debt service ratio ceiling of about 44%, and they qualify an uninsured mortgage at the greater of the contract rate plus 2 percentage points and 5.25%. Those figures come from OSFI Guideline B-20, which sets expectations that federally regulated lenders apply when they underwrite residential mortgage and secured lending. Lenders can layer their own policies on top.
The FCAC's mortgage material explains how a mortgage works, what a prepayment charge is, and what you are entitled to know, at the Financial Consumer Agency of Canada's mortgage pages. Read it before you compare offers, because the discharge and registration costs of moving a secured charge are often left out of the headline comparison.
Two structural facts are worth holding onto. Canadian fixed-rate mortgages are compounded semi-annually by law, so a quoted rate on a fixed mortgage is not directly comparable to a line whose interest is calculated on a different basis. And lending in Canada is licensed provincially, so the regulator and the rules differ depending on where you live and who is lending. Federally regulated financial institutions' consumer complaints go to the Financial Consumer Agency of Canada; provinces license and supervise most other lenders.
How to test the decision before you sign anything
- Write down the balance you would move, the current mortgage rate, the rate on the offered line, and any prepayment charge on the existing mortgage.
- Work out the payment you would need to make on the line to clear it in the time the mortgage had left. If you cannot make that payment, the swap does not change your situation.
- Set a floor. Decide the highest balance you will allow on the line and refuse to treat it as a general spending account.
- Check the equity caps. Ask the lender how it calculates the limit against property value and what total secured borrowing it allows.
- Ask what happens to the payment if the rate rises, and how much the payment would change.
- Confirm the discharge and registration costs in writing, and who pays them.
- Ask whether the line can be converted to a fixed-rate amortizing segment later, and on what terms.
If you cannot answer the second step with a number you can actually pay, the plan is not a plan yet.
Where loanmoose.ca fits
loanmoose.ca is not a lender. It does not make loans, set rates, or make credit decisions. It is a matching and comparison service that connects Canadian consumers with licensed lenders and brokers, and any approval decision, rate and term come from the lender that reviews your file.
A swap like this is a significant financial decision. The right answer depends on your income stability, your equity, your other debts, your tolerance for a payment that can move, and your plans for the property. For anything of that size, get advice from a regulated professional who can look at your full picture rather than a general guide.