How a HELOC Works in Canada: Value Limits, Variable Pricing and Interest-Only Payments

A home equity line of credit (HELOC) is a revolving line of credit secured against your home. At federally regulated lenders, the line itself is generally capped at 65% of the appraised property value, while all secured borrowing against that same home — your first mortgage included — is usually capped at 80%. The rate floats with a benchmark, and during the interest-only phase your payment covers interest alone, which means the balance does not fall unless you deliberately pay it down.

What “HELOC” means, and why “secured” is the operative word

A HELOC is a secured line of credit. The lender registers a charge against the title to your property, and that security is what allows the rate to sit well below unsecured credit cards or an unsecured line of credit. In exchange, the debt is attached to an asset you cannot easily walk away from.

It is also revolving. You draw up to the approved limit, repay, and draw again. That flexibility is the point of the product — and it is also the reason a balance can sit high for years without anything pushing it down.

Most HELOCs are registered as a collateral charge rather than a standard mortgage charge. In practice that means the lender's security is set up to cover future lending on the same property, and moving the whole arrangement to another lender later can involve legal work and discharge costs. Ask about registration and discharge costs before you sign, not after.

The 65% and 80% limits: two tests running at the same time

These percentages are usually quoted as if they were one rule. They are two separate constraints, and both apply to you.

Your usable room is the lower of the two results. In words: the line can never exceed 65% of the appraised value, and it can never push everything secured against the home past 80%. If you already owe a large amount on a first mortgage, the 80% test binds first and your line is small. If your mortgage is nearly paid off, the 65% test binds instead.

This is also why paying down your mortgage increases HELOC room even when your property value has not moved: the total secured figure drops, and the gap to the 80% ceiling widens.

Why the cushions exist

A HELOC almost always sits behind a first mortgage in priority. If you default and the home is sold, the first mortgage is paid first, then the costs of the sale, and the lender holding the line is left with whatever remains — which is why the 80% total cap exists as a buffer against falling values and transaction costs.

The 65% sub-cap is a second buffer of a different kind. It stops the entire equity cushion from being consumed by a revolving product that has no repayment schedule attached to it. OSFI's Guideline B-20 sets out the underwriting expectations that produce this structure at federally regulated lenders.

Variable pricing: how the rate on a HELOC is actually built

A HELOC rate is normally quoted as a benchmark plus or minus a spread. Two separate things move:

• The benchmark. When the lender's prime rate changes, your rate changes with it, typically within a short period. Your payment changes too, because it is calculated on the outstanding balance at the new rate.
• The spread. This is the negotiable part. It reflects your credit history, the combined loan-to-value position, the size of the line, and whether the lender already holds your first mortgage.

Structurally, this differs from a fixed-rate mortgage. Canadian fixed-rate mortgages are compounded semi-annually by law, so the posted rate and the true annual cost are not the same number — the Financial Consumer Agency of Canada explains how mortgage interest and prepayment work. A HELOC does not behave that way. It floats, so your cost is whatever the benchmark plus spread happens to be across the months you carry the balance, and you cannot know that in advance.

When you compare home equity line of credit lenders, ask each one to quote the benchmark and the spread separately, and ask what the spread would be if you moved your first mortgage over as well. A single headline rate tells you very little about what you will actually pay, because the spread is the part that varies borrower to borrower.

Interest-only payments: the part people underestimate

During the draw period, most HELOCs require a payment that covers accrued interest and nothing else. No principal is retired. The balance stays where it is — and if you keep drawing, it grows.

The consequence is simple: an interest-only HELOC has no built-in end date. It is repaid when you repay it, when part of the balance is converted to a fixed-rate amortising portion, or when the lender requires it. Many HELOC products allow you to convert a portion of the balance to an amortising term, which is usually the sensible move once the balance stops being short-term. Read what your specific agreement says about conversion and repayment.

Two risks follow directly from the structure:

1. Rate risk. Your payment rises with the benchmark while the principal stays put, so an increase hits your cash flow without any offsetting reduction in what you owe.
2. Value risk. If property values fall after you draw, the debt stays fixed while the asset backing it shrinks.

For context on how high rates can legally go, the Criminal Code criminal rate of interest is 35% per year (s. 347), calculated using a defined method that aggregates interest and certain charges. That is a criminality threshold, not a benchmark — a HELOC priced anywhere near it would be extraordinary.

What lenders look at, and where to check your own file

Approval comes down to equity, income and credit:

• Equity — the 65% and 80% tests above.
• Income and existing debt — a total debt service ratio ceiling of about 44% at federally regulated lenders, with qualification at a stress-test rate above the contract rate, as set out in OSFI Guideline B-20.
• Credit — repayment history and current obligations. Canada has two national credit reporting bureaus, Equifax Canada and TransUnion Canada, and a free copy of your credit report is available from each.

Timing matters if your file has a history. A consumer proposal stays on a credit report for three years after completion, or six years from filing, whichever comes first. A first bankruptcy stays on a credit report for six years after discharge. Lenders see those dates, so how recently they fall is often as important as the fact itself.

How to compare HELOC offers: a practical order of operations

1. Establish the numbers. Get your current secured balance and a defensible appraised value, not an online estimate.
2. Run both tests. Work out 65% of the value, and work out 80% of the value minus everything already secured against the home. The smaller figure is your ceiling.
3. Ask for benchmark and spread separately from each lender, plus the conditions that would change the spread.
4. Ask what it costs to register, and to discharge later. A collateral charge that is cheap to set up can be expensive to unwind.
5. Ask what happens after the draw period — whether the balance converts, amortises, or becomes payable.
6. Ask what triggers a rate change and confirm the current spread in writing, not verbally.
7. Know your escalation route. Complaints about federally regulated financial institutions go to the Financial Consumer Agency of Canada; provinces license and supervise most other lenders and each maintains a consumer protection office.

When a HELOC is the wrong tool

A HELOC is not cheap money simply because the rate looks low next to a credit card. It converts unsecured debt or spending into debt secured by your home, and it removes the repayment pressure that would otherwise force the balance down. If your plan depends on a balance being retired on a schedule, an amortising product is the more honest fit.

Alternatives worth pricing include refinancing your first mortgage to pull out funds on an amortising schedule, or an unsecured instalment loan or line of credit that leaves your home out of it — usually at a higher rate, but without your property as collateral. If your situation involves serious debt difficulty, note that only a licensed insolvency trustee can administer a consumer proposal or bankruptcy in Canada, and trustees are regulated by the Office of the Superintendent of Bankruptcy Canada.

Borrowing against your home is a significant decision, and the right answer depends on your income stability, your equity position and your timeline. That is a conversation to have with a regulated professional — a mortgage broker, an accountant, or a licensed insolvency trustee where debt is already unmanageable — rather than a decision to make from a rate headline.

loanwolf.ca is a matching and comparison service, not a lender. We do not make loans, set rates or make credit decisions. The lowest advertised rates are only ever available to the most qualified applicants — those with strong credit, stable documented income and comfortable loan-to-value positions — and the rate you are actually offered will depend on your own circumstances.