HELOC Calculator Canada 2026

Calculate interest costs and monthly payments on a home equity line of credit. Estimate how much you can borrow against your Canadian home equity.

Key Takeaways

  • HELOCs allow borrowing up to 65% of your home's value, with mortgage + HELOC combined capped at 80%.
  • Rates are variable (prime + margin) — your cost fluctuates with the Bank of Canada rate.
  • Minimum payments are interest-only, so your principal never decreases without extra payments.
  • HELOC interest may be tax-deductible if funds are used for eligible investment purposes (Smith Manoeuvre).

Understanding HELOCs in Canada

A Home Equity Line of Credit (HELOC) allows Canadian homeowners to borrow against the equity in their property on a revolving basis, similar to a credit card but at much lower interest rates. HELOCs are a flexible borrowing tool commonly used for renovations, investing, debt consolidation, or as an emergency fund. In Canada, you can borrow up to 65% of your home's appraised value through a HELOC, with the combined total of your mortgage and HELOC not exceeding 80% of the property's value.

Unlike a mortgage where you receive a lump sum and repay it on a fixed schedule, a HELOC lets you draw funds as needed up to your credit limit and repay on your own timeline — with only interest-only minimum payments required. The flexibility is powerful but requires discipline, as the revolving nature means your balance can remain high indefinitely if you only make minimum payments. Understanding the terms, rates, and risks helps you use a HELOC effectively as part of your overall financial strategy.

How It Works

Enter your home's current appraised value, your outstanding mortgage balance, and the HELOC interest rate (typically prime rate plus a margin). The calculator determines your maximum available HELOC limit based on the 65% LTV ceiling and the 80% combined ceiling, then computes the interest cost on any drawn amount.

The calculator shows your monthly interest-only payment for different draw amounts and illustrates how the interest cost changes as prime rate fluctuates. You can model repayment scenarios to see how making principal payments beyond the interest-only minimum accelerates your paydown. This helps you plan your borrowing and ensure the HELOC cost fits within your budget.

Readvanceable Mortgages and the Smith Manoeuvre

A readvanceable mortgage combines a traditional mortgage with a HELOC under one facility. As you make mortgage payments that reduce your principal, the HELOC limit automatically increases by the same amount. This keeps the total facility at the original approved amount and gives you ongoing access to your equity.

This structure is the foundation of the Smith Manoeuvre — a Canadian tax strategy where you reborrow the principal paid down on your mortgage and invest it in income-producing assets. The interest on the borrowed-to-invest portion becomes tax-deductible, effectively converting your non-deductible mortgage interest into a deductible expense over time. Trailfolio has a dedicated Smith Manoeuvre calculator for modeling this strategy.

HELOC vs Other Borrowing Options

HELOCs typically offer the lowest borrowing rates available to consumers because they are secured against your home. Compare this to unsecured lines of credit (prime + 2-5%), credit cards (19-29%), and personal loans (6-15%). However, lower rates come with higher stakes — your home is the collateral.

For renovations, a HELOC is often more cost-effective than a home equity loan if you need funds in stages rather than all at once, since you only pay interest on the amount drawn. For debt consolidation, a HELOC can dramatically reduce interest costs, but requires discipline to avoid running up the consolidated debts again.

Key Facts

  • Canadian regulations limit HELOC borrowing to 65% of your home's appraised value. Combined with a mortgage, the total cannot exceed 80% of the home's value.
  • HELOC rates are variable, typically set at prime rate plus a margin ranging from 0% to 1%. Your rate fluctuates with the Bank of Canada's overnight rate.
  • Minimum payments are interest-only, meaning your principal balance does not decrease unless you make additional payments.
  • A readvanceable mortgage combines a traditional mortgage with a HELOC — as you pay down mortgage principal, the HELOC limit automatically increases by the same amount.
  • HELOC interest may be tax-deductible if the borrowed funds are used for eligible investment purposes (such as investing in income-producing assets).
  • Lenders can reduce your HELOC limit or demand full repayment at any time, though this is rare in practice.
  • To qualify for a HELOC, you typically need a minimum credit score of 680 and proof of sufficient income to service the interest payments.

FAQ

What is the difference between a HELOC and a home equity loan?

A HELOC is a revolving line of credit — you draw and repay funds as needed, paying interest only on the amount currently borrowed. A home equity loan (sometimes called a second mortgage) provides a lump sum upfront with fixed payments over a set term, similar to a regular mortgage. HELOCs offer more flexibility but have variable rates, while home equity loans offer payment predictability with a fixed rate. Choose based on whether you need ongoing access to funds or a one-time lump sum.

How is HELOC interest calculated in Canada?

HELOC interest is calculated daily on your outstanding balance and charged monthly. The rate is variable, typically expressed as prime plus a margin (e.g., prime + 0.5%). When the Bank of Canada raises or lowers its policy rate, your HELOC rate changes accordingly. For example, if prime is 5.95% and your margin is 0.5%, your HELOC rate is 6.45%. Daily interest is calculated as (balance x annual rate) / 365.

What is a readvanceable mortgage?

A readvanceable mortgage is a combined product that includes a fixed mortgage portion and a HELOC under one umbrella. As you make mortgage payments that reduce your principal, the HELOC credit limit automatically increases by the same amount, keeping the total facility at the original approved amount. This structure is particularly useful for strategies like the Smith Manoeuvre, where you reborrow the paid-down principal to invest and make the interest tax-deductible.

Can HELOC interest be tax-deductible?

Yes, but only if the HELOC funds are used for eligible investment purposes — specifically, to earn income from a business or investments. If you borrow from your HELOC to invest in stocks, bonds, or rental property, the interest may be deductible against your investment income. The CRA requires you to maintain a clear paper trail showing the borrowed funds were used for income-producing purposes. Interest on HELOC funds used for personal expenses (renovations, vacations, etc.) is not deductible.

What are the risks of a HELOC?

The main risks include: variable interest rates can increase your costs significantly if rates rise; interest-only payments make it easy to carry a large balance indefinitely without building equity; your home serves as collateral, so default could result in foreclosure; and lenders can technically reduce or freeze your credit limit. Additionally, using a HELOC for consumption spending (rather than investments or value-adding renovations) reduces your home equity without building assets. Treat HELOC borrowing as strategically as you would a mortgage.

Updated March 2026. Information on this page is provided for educational purposes only. Tax rules, rates, and government programs may change — verify details with the CRA or a qualified financial advisor.