Mortgage refinancing means paying off your existing mortgage and replacing it with a new one, usually to get a different rate, change the amortization, or access home equity. It is not the same as a renewal, and the costs — especially the prepayment penalty — often decide whether it is worth doing.

Mortgage refinancing replaces your current mortgage with a brand-new one, typically with a different rate, term, amortization or a larger balance, so you can lower your payments, pull equity out of your home, or fold other debts into the mortgage. It is not a renewal, and treating the two as interchangeable is one of the most expensive assumptions a Canadian homeowner can make.

Feature	Renewal	Transfer (switch)	Refinance
What happens	New rate and term with your existing lender	Same mortgage moves to a new lender	Old mortgage is paid out; a new one is registered
Can the balance increase?	No	No	Yes — equity take-out is allowed
Can the amortization change?	Rarely, and only within limits	Rarely	Yes, up or down
Prepayment penalty	Generally none at maturity	Depends on the terms you are leaving	Usually applies if you break the term early
Approval process	Light — often just a signature	New lender reviews your file	Full application, income verification, stress test
Default insurance	Unchanged	Unchanged	Not available on the refinanced amount

What mortgage refinancing actually does

When you refinance, your existing mortgage is paid out and discharged, and a fresh mortgage is registered against the property. Because the old loan is repaid before its term ends, the lender can charge a prepayment penalty — frequently the largest single cost in the whole transaction. The new mortgage can be shaped almost any way your lender allows: a new rate, a new term, a longer amortization to shrink the monthly payment, a shorter one to build equity faster, or a larger principal that pays the difference to you in cash.

Refinancing is generally limited to 80% of your home's appraised value. The reason is insurance: mortgage loan insurance from the Canada Mortgage and Housing Corporation and private insurers is not available for a refinanced loan, so lenders keep the loan-to-value ratio at or below 80%. That ceiling is lower than what a purchase can reach, which is why a large equity take-out is not always possible even when your home value has climbed sharply. The Financial Consumer Agency of Canada's mortgage resources explain the underlying rules on mortgage types and terms.

When refinancing helps — and when it does not

• You need equity for something concrete. A renovation that raises the home's value, an unavoidable large expense, or a down payment on another property.
• Your finances have improved. If your original mortgage was approved at a higher rate because of thin credit or a co-signer arrangement, a refinance lets you requalify on your current profile.
• You are consolidating high-interest debt. Moving credit card balances into a mortgage at a much lower rate cuts interest cost, but it also converts unsecured debt into debt secured by your home. Missed payments then put the house at risk. If your credit file is damaged, compare options carefully — see bad credit loans for how lenders treat weaker applications.
• You want to change the loan's shape. Stretching the amortization lowers the payment; shortening it raises the payment but cuts total interest.

Refinancing is usually a poor fit when the only goal is a slightly lower rate and you are mid-term on a fixed mortgage. The penalty can easily exceed the interest saved, particularly when rates have fallen a lot since you signed — the charge on a fixed-rate mortgage often grows as the gap between your contract rate and current rates widens. Waiting for maturity is often the cheaper path. Run the numbers with a loan payment calculator before committing to anything.

Timing matters, but not in the way most people assume. The Bank of Canada's published interest rates influence variable-rate mortgages directly and fixed rates indirectly, yet the decision should rest on your own penalty figure and remaining term rather than on a forecast of where rates go next.

What refinancing costs in Canada

Refinancing is not free, and the costs fall into three buckets.

1. Prepayment penalty. If you break a closed term, the lender charges a prepayment cost. On many variable-rate mortgages it is calculated as three months' interest; on fixed-rate mortgages it is usually the greater of three months' interest or an interest rate differential. Lenders calculate the differential in different ways and the result can run into thousands of dollars, so ask for the exact figure in writing before you decide.
2. Fees to set up the new mortgage. Appraisal, title search, legal or notary fees, discharge of the old charge, and registration of the new one. These vary by province and by lender, and some lenders waive portions when you refinance with them.
3. Lost promotional value. If you received a cash-back or a discounted rate, refinancing early may require you to repay part of it, depending on the contract.

Request a written disclosure of the prepayment charge and an itemised list of fees from every lender before you sign. Plain-language material on borrowing costs and borrower rights is published by the Financial Consumer Agency of Canada, and it is worth reading before you compare offers.

How refinancing differs from a renewal

A renewal happens at the end of your term with your existing lender. You agree a new rate and term, usually with no penalty, minimal paperwork and no full re-qualification. Nothing about the balance or the amortization changes unless the lender agrees to it. A transfer, sometimes called a switch, moves the same mortgage to a different lender at maturity — you get a new rate without breaking your term, and again the balance stays put.

A refinance is a new loan. The balance can go up, the amortization can change, borrowers can be added or removed, and the lender will assess your income, debts, credit score and the property all over again. For federally regulated lenders, an uninsured refinance must pass the mortgage stress test, which means qualifying at a minimum qualifying rate set by the Office of the Superintendent of Financial Institutions, not simply at the rate you are being offered. That is why some homeowners discover they cannot refinance as much as they hoped even though their equity looks substantial on paper.

The practical upshot: if all you want is a better rate, renew or transfer and skip the penalty. If you want to change the size or structure of the loan, you need a refinance, and you should plan it so the penalty is tolerable — usually by doing it at or near maturity.

How the process works

1. Check your current mortgage documents for the prepayment charge formula and any cash-back clawback.
2. Get a current payoff statement from your lender, valid for a set number of days.
3. Apply with one or more lenders, providing income, employment and equity documentation.
4. Arrange an appraisal if the lender requires one — the loan-to-value ratio is based on appraised value, not on a municipal assessment.
5. Review the commitment letter, including the fee list and the prepayment penalty, before signing.
6. Complete the legal work: discharge the old charge, register the new one, and collect any cash portion.

Adding or removing a borrower happens through the same application. Everyone who remains on the mortgage must requalify, and any new co-signer or guarantor is assessed on their own income and debts. If you are considering bringing someone in to help you qualify, read what a co-signer is first — it explains the obligations that come with the role before anyone signs.

Common mistakes to avoid

• Chasing a small rate cut mid-term. Compare the penalty plus fees against the total interest saved over the remaining term, not the monthly payment difference.
• Taking the maximum equity available. A larger mortgage means a larger payment and more interest over time; borrow what the purpose actually requires.
• Stretching the amortization to the limit. It lowers the payment but can add years of interest, and it slows how quickly you build equity.
• Ignoring the stress test. Assuming you qualify at the advertised rate leads to disappointment and wasted applications.
• Comparing monthly payments only. Ask for total cost over the term and the penalty rules in writing from each lender.
• Consolidating unsecured debt without a plan. The credit cards often refill, and now the balance is secured against your home.
• Assuming a renewal and a refinance cost the same. They do not, largely because of the prepayment charge.