How a HELOC Works in Canada: the 65% and 80% Limits, Floating Rates and Interest-Only Payments

A home equity line of credit — a HELOC — is a revolving line of credit secured against your home. At federally regulated lenders, the line itself is generally limited to 65% of the appraised property value, while all secured lending against that same property is usually capped at 80%. Pricing floats against a benchmark rather than being fixed at signing, and the minimum payment is often interest-only — which is why a HELOC can sit completely flat for years while it quietly costs you money.

What is a home equity line of credit (HELOC)?

People asking “what is home equity line of credit HELOC” usually want the difference between it and a loan. The answer is in the word secured. A HELOC is a secured line of credit: the lender registers a charge against the property, and that collateral is what allows the interest rate to sit well below what unsecured credit costs.

Functionally it behaves like a credit card with a much lower rate and a much larger limit. You draw what you need, you repay, and the repaid principal generally becomes available again.

• Revolving access: borrowed funds can be redrawn, unlike a closed mortgage where principal repaid usually stays paid.
• Collateral: your home secures the debt, so default puts the property at risk.
• Registration: the charge sits on title and can affect how easily you move your first mortgage to another lender later.

Many HELOCs are set up as part of a readvanceable mortgage, where the mortgage and the line sit under one charge. The practical effect is that the lender re-tests collateral once rather than twice, and your borrowing room adjusts as the first mortgage is paid down.

How the 65% and 80% value limits actually work

These are two separate tests, and confusing them is the most common mistake borrowers make.

• The 65% test applies to the line of credit alone. At federally regulated lenders, the HELOC limit is generally no more than 65% of appraised property value.
• The 80% test applies to everything registered against the home. First mortgage + HELOC + any other secured charge, divided by appraised value, usually has to stay within 80%.

In practice the 80% test is the binding one. Your available room is not “65% of what my house is worth” — it is the gap between your existing secured debt and the 80% ceiling, capped again by the 65% rule on the line itself. A borrower with a large first mortgage can have substantial equity and still qualify for only a modest line.

Test	What it measures	Ceiling	Why it matters to you
HELOC-only limit	Line of credit balance ÷ appraised property value	65%	Caps how large the revolving portion can be on its own
Combined secured limit	First mortgage + HELOC + other secured charges ÷ appraised value	80%	This is your real available room, and it shrinks as the first mortgage grows
Debt service test	Total debt service ratio across all debts	About 44%	Equity alone does not qualify you
Stress test	Qualifying rate applied above the contract rate	Set under Guideline B-20	Reduces the amount you can actually qualify to borrow

Equity is not the same thing as affordability. Federally regulated mortgage lenders generally work to a total debt service ratio ceiling of about 44% and apply a qualifying stress-test rate above the contract rate, as described in OSFI’s Guideline B-20. The amount a lender will actually advance is frequently smaller than the arithmetic equity suggests. It is also worth knowing that the 65% and 80% limits are underwriting conventions used by federally regulated lenders; provincially regulated lenders work under their own frameworks, so a figure quoted by one lender does not automatically transfer to another.

Why HELOC pricing is variable

A HELOC is almost always priced as a variable rate: a benchmark — commonly the lender’s prime rate — minus or plus a margin. The margin reflects your credit history, income, property type and loan-to-value position. Your contract fixes the margin; the benchmark does not stay put.

That is the entire mechanism behind a payment that changes. Interest is charged on the outstanding balance at the current benchmark plus your margin. When the benchmark moves, the interest charged moves with it, and if you are paying interest only, your required payment changes without your balance changing at all.

Compare that with a fixed-rate mortgage, which in Canada is compounded semi-annually by law and whose cost is defined at signing. A line of credit has no such fixed schedule. The Financial Consumer Agency of Canada’s mortgage resources are a useful reference for how mortgage costs are disclosed and calculated, and the same underlying logic applies to any borrowing secured by the home.

What actually changes your rate over time

• The benchmark itself, which lenders move when funding conditions change.
• Any introductory discount on the margin, which may reset after a stated period.
• Renegotiation: as your loan-to-value ratio falls, there is more room to ask for a tighter margin.
• Lender-level repricing, where an institution adjusts margins across its portfolio rather than for you specifically.

Interest-only payments: how they work

Most HELOCs require only an interest payment during the draw period. The account stays current; the principal does not move.

Two things follow from that:

1. The payment is not evidence of progress. Paying interest only means you have rented the money, not repaid it.
2. The repayment risk is deferred, not removed. When the draw period ends, the lender may require a lump-sum repayment, convert the balance to an amortising schedule, or — where the agreement allows — demand repayment.

That last point deserves attention, because HELOCs are commonly structured so the balance is repayable on demand. A lender does not usually exercise that right while you are current, but the option shapes how much certainty the facility genuinely gives you.

Think of every payment as rent plus repayment

Split any payment mentally into two parts: the interest charge, which is rent, and everything above it, which is repayment. If the benchmark rises, the rent portion grows and the same payment repays less principal — your schedule quietly lengthens without you doing anything wrong. This is why choosing a payment you could sustain if rates move against you matters more than negotiating the lowest possible starting margin.

What to compare between home equity line of credit lenders

1. Who regulates them. Consumer complaints about federally regulated financial institutions go to the Financial Consumer Agency of Canada; provinces license and supervise most other lenders and each has a consumer protection office. Knowing which applies tells you where a dispute actually goes.
2. The margin and its benchmark. Ask what the margin is measured against, whether any discount is temporary, and how the lender notifies you when the benchmark changes.
3. The combined loan-to-value position. Ask for the figure after the line is fully drawn, not just the headline HELOC limit.
4. Payment options. Confirm whether the minimum is interest-only, and whether you can set a higher payment without penalty.
5. Conversion terms. Some lenders let you convert part of the balance into a fixed-rate term with a defined amortisation. Ask whether that option exists and how the rate would be set.
6. Costs and exit terms. Ask about setup, appraisal, annual administration and discharge charges, and specifically what happens if you want to move the first mortgage to another lender while the line remains registered.

Risks worth understanding before you draw

• Your home is the collateral. A secured line is cheaper than unsecured credit precisely because the lender has a claim on the property. Unsecured debt cannot cost you your home; this can.
• Property values fall as well as rise. A drop in appraised value can push combined secured lending past the lender’s 80% threshold, which limits your ability to refinance or renew on favourable terms.
• Variable pricing cuts both ways. The mechanism that lowers your cost when the benchmark falls raises it when the benchmark rises.
• Interest-only minimums disguise the real cost. A flat balance is easy to read as stability. It is not.
• Registration complicates refinancing. A collateral charge can make switching lenders more expensive and more administrative than a standard mortgage transfer.

Regulation, complaints and consequences

Underwriting at federally regulated mortgage lenders sits under Guideline B-20, which sets expectations for income verification, debt service ratios and stress testing. If you have a complaint about a federally regulated institution and cannot resolve it directly, the Financial Consumer Agency of Canada handles consumer complaints; for other lenders, the relevant provincial consumer protection office is the route.

If the debt becomes unmanageable, only a licensed insolvency trustee can administer a consumer proposal or a bankruptcy, and trustees are regulated by the Office of the Superintendent of Bankruptcy Canada. The credit-report consequences run long: a consumer proposal stays on your report for three years after completion or six years from filing, whichever comes first, and a first bankruptcy stays for six years after discharge. You can review your own file at no cost through either of Canada’s two national credit reporting bureaus, Equifax Canada and TransUnion Canada. That is background information, not advice — for a decision this size, regulated professional advice is appropriate.

loanloon.ca is a matching and comparison service, not a lender. We do not make loans, set rates or make credit decisions; we connect you with lenders whose criteria fit your situation, and the terms you are offered come from them. The lowest rates on any secured product are only available to the most qualified applicants — strong credit, verifiable income, a conservative loan-to-value position and a property that appraises where you expect. If your profile is weaker in any of those areas, expect a wider margin, a smaller limit or a decline, and plan what you borrow around that reality rather than around the best-case number.

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• Financial Consumer Agency of Canada — mortgages — Financial Consumer Agency of Canada
• OSFI Guideline B-20 — residential mortgage underwriting — OSFI Guideline B-20