How HELOC Interest-Only Payments Work and Why That Structure Can Hurt You
A $300,000 line of credit tied to your house costs you $1,875 this month if you carry the full balance. That's interest only, at Prime plus one percent. No principal comes off. The balance doesn't shrink unless you choose to pay it down. Next month, if the Bank of Canada moves, the payment moves with it.
That's how a HELOC works in practice. Not as described in the brochure.
The Payment Structure No One Warns You About
Most Canadians think of a HELOC as a mortgage with better terms. It isn't. It's revolving debt structured like a credit card but secured against your house. The minimum monthly payment is the accrued interest. Nothing more. If you borrowed $50,000 three years ago and have been paying the minimum every month, you still owe $50,000.
Banks frame this as flexibility. You can pay as much or as little as you want. True, but incomplete. The flexibility cuts both ways. Without forced principal reduction, the balance becomes permanent unless you intervene. And most people don't intervene. They pay the minimum because the minimum is what gets billed.
The interest-only structure looks harmless when rates sit at 2.5 percent. Your $100,000 draw costs you about $208 a month. Manageable. But Canadian HELOCs float with Prime, and Prime moves when the Bank of Canada moves. Between March 2022 and July 2023, the policy rate went from 0.25 percent to 5 percent. A $100,000 HELOC that cost $200 per month in early 2022 was costing $550 per month by mid-2023, with zero principal reduction baked into either number.
Why the Revolving Limit Becomes a Trap
A HELOC is readvanceable. As you pay down the balance, your available credit resets to the approved limit. Borrow $40,000, pay back $10,000, and you immediately have $10,000 available again. It never closes. It never forces you to finish paying it off.
This is sold as a benefit. It's a trap for anyone without spending discipline. The line becomes a release valve. Furnace breaks, you tap the line. Roof needs replacing, you tap the line. Kid's tuition is due, you tap the line. Each time, you're converting an expense into debt that carries no repayment schedule. You're also converting frozen home equity into liquid spending capacity, which changes how people behave. Studies on consumer behaviour consistently show that accessible credit gets used more than inaccessible credit, regardless of need.
In Canada, the revolving portion of a HELOC is capped at 65 percent of your home's appraised value under OSFI rules. Total financing, including your mortgage, cannot exceed 80 percent loan-to-value. That ceiling matters when home prices drop. If your $500,000 house falls to $425,000, your $325,000 approved limit might get reduced to $276,250 overnight. The bank doesn't need your permission. HELOCs are demand debt. The lender can freeze or recall the facility at any time.
When It Fits and When It Doesn't
A HELOC makes sense in exactly two scenarios. First, as a short-term bridge you intend to clear within 12 months, a down payment on a rental property you'll refinance, or high-interest credit card debt you'll consolidate and then lock into a fixed-rate mortgage segment. Second, for the Smith Maneuver, where you invest the borrowed funds and claim the interest as a tax deduction.
It does not make sense as a permanent lifestyle account. Treating your home equity like a chequing account erodes wealth. The kitchen renovation financed at Prime plus 0.5 still costs you that rate every month, compounding, until you actively pay it off. And because the payment structure doesn't force you to, most people don't.
The flexibility is real. What's also real: flexibility without forced discipline transfers the entire burden of repayment onto willpower. Most balance sheets lose that fight.
A $300,000 line of credit tied to your house costs you $1,875 this month if you carry the full balance. That's interest only, at Prime plus one percent. No principal comes off. The balance doesn't shrink unless you choose to pay it down. Next month, if the Bank of Canada moves, the payment moves with it.
That's how a HELOC works in practice. Not as described in the brochure.
The Payment Structure No One Warns You About
Most Canadians think of a HELOC as a mortgage with better terms. It isn't. It's revolving debt structured like a credit card but secured against your house. The minimum monthly payment is the accrued interest. Nothing more. If you borrowed $50,000 three years ago and have been paying the minimum every month, you still owe $50,000.
Banks frame this as flexibility. You can pay as much or as little as you want. True, but incomplete. The flexibility cuts both ways. Without forced principal reduction, the balance becomes permanent unless you intervene. And most people don't intervene. They pay the minimum because the minimum is what gets billed.
The interest-only structure looks harmless when rates sit at 2.5 percent. Your $100,000 draw costs you about $208 a month. Manageable. But Canadian HELOCs float with Prime, and Prime moves when the Bank of Canada moves. Between March 2022 and July 2023, the policy rate went from 0.25 percent to 5 percent. A $100,000 HELOC that cost $200 per month in early 2022 was costing $550 per month by mid-2023, with zero principal reduction baked into either number.
Why the Revolving Limit Becomes a Trap
A HELOC is readvanceable. As you pay down the balance, your available credit resets to the approved limit. Borrow $40,000, pay back $10,000, and you immediately have $10,000 available again. It never closes. It never forces you to finish paying it off.
This is sold as a benefit. It's a trap for anyone without spending discipline. The line becomes a release valve. Furnace breaks, you tap the line. Roof needs replacing, you tap the line. Kid's tuition is due, you tap the line. Each time, you're converting an expense into debt that carries no repayment schedule. You're also converting frozen home equity into liquid spending capacity, which changes how people behave. Studies on consumer behaviour consistently show that accessible credit gets used more than inaccessible credit, regardless of need.
In Canada, the revolving portion of a HELOC is capped at 65 percent of your home's appraised value under OSFI rules. Total financing, including your mortgage, cannot exceed 80 percent loan-to-value. That ceiling matters when home prices drop. If your $500,000 house falls to $425,000, your $325,000 approved limit might get reduced to $276,250 overnight. The bank doesn't need your permission. HELOCs are demand debt. The lender can freeze or recall the facility at any time.
When It Fits and When It Doesn't
A HELOC makes sense in exactly two scenarios. First, as a short-term bridge you intend to clear within 12 months, a down payment on a rental property you'll refinance, or high-interest credit card debt you'll consolidate and then lock into a fixed-rate mortgage segment. Second, for the Smith Maneuver, where you invest the borrowed funds and claim the interest as a tax deduction.
It does not make sense as a permanent lifestyle account. Treating your home equity like a chequing account erodes wealth. The kitchen renovation financed at Prime plus 0.5 still costs you that rate every month, compounding, until you actively pay it off. And because the payment structure doesn't force you to, most people don't.
The flexibility is real. What's also real: flexibility without forced discipline transfers the entire burden of repayment onto willpower. Most balance sheets lose that fight.
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