Ontario HELOC Guide: How Home Equity Lines of Credit Actually Work

So You're Thinking About a HELOC

Most Ontario homeowners hear "HELOC" for the first time from a friend who used one to renovate, or from a bank rep at renewal who suggests "freeing up some equity." Both situations skip the part where you actually understand what you're signing up for.

A Home Equity Line of Credit isn't a mortgage and it isn't a loan in the usual sense. It's a revolving line — like a credit card secured by your house — and that one detail changes almost everything about how you should use it.

What an Ontario HELOC Actually Is

You borrow against the equity you've built in your home. The bank approves a credit limit, you draw as much or as little as you want, and you pay interest only on what you've actually borrowed. The rate floats with prime.

With prime sitting at 4.45% today, a typical HELOC posted rate runs prime + 0.50%, which puts most Ontario borrowers around 4.95%. Negotiated, you can sometimes get prime + 0.25%.

The 65% rule

Federal regulation (OSFI Guideline B-20) caps the HELOC portion of any home secured borrowing at 65% of your home's appraised value. You can stack a mortgage on top, but the total of mortgage plus HELOC can't exceed 80% of the home's value.

A worked example for a Mississauga home appraised at $950,000:

• Maximum HELOC stand-alone: $617,500 (65%)
• Maximum combined mortgage + HELOC: $760,000 (80%)
• If your existing mortgage is $500,000, your HELOC room is $260,000 — not $617,500

This trips up a lot of people. The 65% is a ceiling, not an allowance.

Stand-Alone HELOC vs Readvanceable Mortgage

Ontario lenders sell two flavours, and the difference matters more than the branch staff usually explain.

Stand-alone HELOC

A single revolving line, registered as a collateral charge against the title. Pay it down, the credit becomes available again. Simple to understand, easy to close.

Readvanceable (combined) mortgage

A mortgage and a HELOC bundled under one registration, with the HELOC limit growing automatically as you pay down the mortgage. Every dollar of principal you pay frees up a dollar of HELOC room.

The Ontario big players each have their own version:

• Scotia STEP — three to five sub-accounts, mix of fixed mortgages, variable mortgages, lines of credit, and credit cards under one umbrella registration
• RBC Homeline Plan — up to five rate segments, separate term mortgage segments alongside the HELOC
• TD FlexLine — single HELOC with an optional fixed-rate "term portion" you can carve out
• National Bank All-In-One — your entire pay deposits into the HELOC, classic Smith-manoeuvre setup
• Manulife One — same all-in-one structure, popular with self-employed Ontario clients

If you're disciplined and want flexibility, readvanceable is excellent. If you've ever carried a credit card balance month-to-month, it's a trap.

What HELOCs Cost You

Interest, the real number

HELOCs use simple daily interest, not compound. On a $100,000 balance at 4.95%, your monthly interest is roughly $458. But here's what most calculators don't show you: most Ontario HELOCs require interest-only minimum payments. You can pay forever and never touch the principal.

If you only made the minimum payment for 20 years on that $100,000 balance, you'd pay over $110,000 in interest and still owe the original $100,000.

Set-up costs in Ontario

• Appraisal: $350–$550 in most of Ontario, higher for rural or unique properties
• Legal fees: $750–$1,400 for a collateral charge registration with an Ontario real estate lawyer
• Title insurance: $200–$400
• Discharge fee if you ever switch lenders: $200–$400 plus legal

Many Ontario lenders waive or cover most of these for a HELOC over $200,000. Always ask before you sign.

The collateral charge problem

Ontario HELOCs are registered as collateral charges, often for 125% of the value of the home. This is the lender protecting future advances, but it has consequences: switching lenders at renewal usually means paying a lawyer to discharge and re-register, which most lenders won't cover for a transfer-in. You're stickier than you'd be with a standard mortgage charge.

When a HELOC Is the Right Tool

• Major renovation with uncertain timing or final cost. You draw as the work happens, only pay interest on what you've drawn.
• Down payment on a second property, when the second-property mortgage will be financed conventionally and the HELOC gets paid back from sale proceeds or rental cash flow.
• Bridge financing between buying your next home and selling your current one. Cheaper than a formal bridge loan from most Ontario lenders.
• Smith Manoeuvre — converting non-deductible mortgage interest to tax-deductible investment loan interest. Only works if you have the cash flow and risk tolerance to invest the borrowed money in non-registered accounts.
• Emergency reserve for self-employed Ontarians whose income is lumpy. The line sits unused until needed.

When a HELOC Is the Wrong Tool

• Debt consolidation when you haven't fixed the spending. You'll free up credit cards and refill them within 18 months. Now you have HELOC debt and credit card debt, secured by your home.
• Funding a depreciating asset. Borrowing against your home to buy a boat or finance a vehicle stretches a short-term purchase across decades of interest.
• Topping up monthly income. If you're using HELOC draws to cover groceries or your mortgage payment, you're in financial trouble that more debt won't fix. Talk to a Licensed Insolvency Trustee, not your bank.

How Ontario Land Transfer Tax Interacts

This catches people switching from a HELOC to a refinance, or rolling a HELOC balance into a new mortgage at a different lender. Ontario charges Land Transfer Tax on purchase, not on refinance or HELOC set-up, so the act of opening a HELOC doesn't trigger LTT.

But if you're in Toronto and you ever sell to buy a bigger home using HELOC funds as part of your down payment, you'll pay both Ontario LTT and the Toronto Municipal LTT on the new purchase price. For a $1.2M Toronto home, that's roughly $40,000 in combined LTT. First-time buyers get rebates up to $4,000 (provincial) and $4,475 (Toronto).

HELOC vs Home Equity Loan vs Refinance

People use these terms interchangeably and they shouldn't.

If you know exactly how much you need and you want a fixed end date, a home equity loan is usually cheaper than a HELOC over its life. If you're cash-flow tight and want the lowest possible monthly carrying cost, refinance into a longer amortization. If you want flexibility, HELOC.

What Stress Test Applies

HELOCs are subject to the qualifying rate stress test like any other federally regulated mortgage product. As of 2026, you have to qualify at the greater of:

• 5.25%, or
• Your contract rate plus 2%

So a HELOC priced at prime + 0.50% = 4.95% gets stress-tested at 6.95%. The lender qualifies you on the full credit limit, not what you plan to draw. Ask for a $400,000 line and they assess your debt service ratios as if you owe $400,000 at the stress test rate. This is why HELOC applications get declined more often than people expect.

What This Means for You

A HELOC is the right tool for a specific kind of borrower: someone with steady income, low or no other debt, a clear use case, and the discipline to pay down draws aggressively. For that person, it's the cheapest, most flexible borrowing available against a home.

For everyone else, it's a slow leak. The interest-only minimum makes it feel affordable, the collateral charge makes it sticky, and the variable rate means your costs can climb without warning. Before you apply, write down exactly what you'll spend the money on, the date you'll have it repaid by, and the dollar amount you'll pay each month above the interest-only minimum. If you can't answer those three questions, you don't need a HELOC yet.

Want to model what the payments look like before you call a lender? Try our HELOC payment calculator or run the numbers in our refinance calculator to see which option costs less.

Frequently Asked Questions