Two clients called me this week with the same question.

Both owned their homes. Both had equity. Both wanted to consolidate some high-interest debt — credit cards, a line of credit, the usual suspects that quietly drain $500 to $1,000 a month in interest alone.

And both asked: “Should I just refinance?”

It’s the default move. Break the mortgage, roll everything into one new loan, one payment, done. Clean and simple.

But here’s the thing — “simple” isn’t always “cheapest.” And in one of those conversations, the refinance would’ve actually cost more than the debt it was meant to eliminate.

Let me break down both options so you can see what I showed them.

Option 1: The Full Refinance

A full refinance means breaking your current mortgage and replacing it with a new, larger one. You borrow enough to pay off the existing balance plus whatever you’re consolidating — credit cards, car loans, a line of credit.

What you get:

• One mortgage, one payment, one rate
• A fixed rate locked in for the full term — or a variable rate at prime − 0.50% (3.95% today)
• A clean structure — everything under one roof
• Forced principal repayment built into every payment

What it costs:

• A prepayment penalty to break your existing mortgage
• Legal fees (typically $1,000–$2,000)
• An appraisal ($300–$500)
• Full re-qualification — income verification, stress test, the works

That penalty is the big variable. And most people assume it’s a fixed number — something you check once and plan around. It’s not.

Your prepayment penalty is a moving target. It changes when interest rates go up. It changes when rates go down. And it shrinks as you get closer to your maturity date. It’s driven by something called the Interest Rate Differential (IRD), which compares your contract rate to what the lender could re-lend that money at today.

That means there are windows — sometimes weeks or months — where the penalty drops significantly. This is something I track for my clients. If we know a refinance makes sense for your situation, we’re not guessing at the timing. We’re watching for the right moment to pull the trigger.

Option 2: Keep the Mortgage, Add a HELOC

A Home Equity Line of Credit lets you borrow against your home’s equity without touching your existing mortgage. You layer a HELOC on top, and your existing mortgage stays exactly where it is — no penalty.

What you get:

• Your current mortgage stays untouched — no penalty
• Revolving access to the funds (pay it down, use it again)
• Flexibility — borrow only what you need, when you need it

What it costs:

• Legal fees and an appraisal — same as a refinance on that front
• A higher interest rate: HELOCs are typically priced at prime + 0.50%, which is 4.95% today — compared to 3.95% on a variable-rate mortgage
• Two products to manage instead of one

Two things most people don’t realize about HELOCs:

First, your HELOC payments are interest-only. That’s the minimum. Which means unless you’re making a conscious effort to pay down the principal each month, the balance just sits there. A mortgage forces you to repay principal with every single payment. A HELOC doesn’t. That flexibility can be a trap if you’re not disciplined about it.

Second, not every lender offers a HELOC, and the rules change depending on who holds your mortgage. If your mortgage and HELOC are with the same lender, your combined borrowing can go up to 80% of your home’s value. But if they’re with different lenders — say your mortgage is with TD and you want a HELOC from Scotia — the HELOC portion caps at 65% loan-to-value. That can significantly limit how much you’re able to borrow.

Here’s the key upfront difference: you skip the penalty entirely. The legal fees and appraisal are comparable either way. So when someone tells you a HELOC is “cheaper to set up” — what they really mean is you’re avoiding the prepayment penalty on your existing mortgage. That’s where the real savings is.

The Math Side by Side

Let’s use a simplified example.

Your situation: Home worth $600,000. Current mortgage balance: $350,000 at a 4.89% fixed rate with 3 years left on the term. You want to consolidate $60,000 in credit card debt at 20% interest.

Scenario A — Full Refinance (variable rate):

• New mortgage: $410,000 at prime − 0.50% (3.95%) over 25 years
• Prepayment penalty: ~$8,000 (mid-term IRD — this number moves)
• Legal + appraisal: ~$2,000
• Total upfront cost: ~$10,000
• Monthly payment: ~$2,150 (principal + interest — balance goes down every month)
• One payment. Forced repayment. Done.

Scenario B — Mortgage + HELOC:

• Keep existing mortgage: $350,000 at 4.89% (no change, no penalty)
• New HELOC: $60,000 at prime + 0.50% (4.95%)
• Legal + appraisal: ~$2,000
• Total upfront cost: ~$2,000
• Monthly: ~$1,800 mortgage + ~$248 HELOC (interest only) = ~$2,048
• Two payments. $8,000 less out of pocket on day one — but the HELOC balance stays at $60,000 unless you actively pay it down.

At first glance, Scenario B looks like the clear winner. You save $8,000 upfront and your monthly payment is actually lower.

But look closer. That $2,048 payment in Scenario B includes zero principal repayment on the HELOC. After 12 months, you still owe $60,000 on the line. In Scenario A, after 12 months your total balance has dropped by several thousand because every payment chips away at principal.

And the rate gap matters: 4.95% on the HELOC vs. 3.95% on the variable mortgage is a full percentage point more on every dollar borrowed. Over a short period — say, three to six months — it doesn’t move the needle much. But if that $60,000 is sitting on the HELOC for a year or more, you’re paying roughly $600 more per year in interest and not reducing the balance.

The 6-Month Rule of Thumb

Here’s the mental model I give my clients:

If you’re going to pay back the borrowed amount within about six months, the HELOC usually wins. You avoid the penalty, you pay slightly more interest for a short window, and you’re done. The math works in your favour.

If you’re going to carry that balance for longer than six months, it’s worth looking at rolling it into the mortgage. The lower rate saves you more over time than the penalty costs upfront — especially if we can time the break to minimize that penalty. And your mortgage payment forces you to make progress on the balance every month.

It’s not a hard rule. The exact crossover depends on the penalty amount, the rate spread, and how aggressively you plan to pay down the HELOC. But six months is a good starting point for the conversation.

Option 3: Do Both

Here’s what most articles on this topic won’t tell you — it doesn’t have to be one or the other.

You can refinance your mortgage and add a HELOC in the same transaction. Consolidate the high-interest debt into your new mortgage at a lower rate with forced repayment, and set up a HELOC on the remaining equity for future needs — renovations, an emergency buffer, an investment opportunity.

One set of legal fees. One appraisal. You get the structure and discipline of a mortgage on the debt that needs it, plus the flexibility of a revolving line for whatever comes next.

This is often the best of both worlds — and it’s something I set up for clients regularly.

When Each Structure Wins

Full refinance makes sense when:

• The penalty is manageable (or we’ve found a low-penalty window)
• You’re consolidating a large amount
• You want the simplicity of one payment with forced principal repayment
• You’re not planning to re-borrow against the equity

Refinance + HELOC makes sense when:

• You want to consolidate now and keep future access to your equity
• You’d rather not come back in a year for another set of legal fees
• Your equity supports both the new mortgage and a line on top

HELOC only makes sense when:

• You’re mid-term and the penalty is steep
• You only need a portion of your available equity
• You want revolving access without disrupting your current mortgage
• You have a clear repayment plan and the discipline to stick to it
• Your mortgage lender offers a HELOC (or the 65% LTV cap with a second lender still gives you enough room)

Neither works when:

• Your loan-to-value is already too high
• Income or credit won’t qualify for additional borrowing
• The underlying issue isn’t structural — it’s a spending pattern that’ll repeat

That last point matters. If high-interest debt keeps coming back, consolidating it into your mortgage — or parking it on a HELOC you never pay down — is a temporary fix. The structure only works if the behaviour changes too.

The Bottom Line

“Should I refinance?” is never a yes-or-no question. The answer depends on how much you need, how long you’ll carry it, what your penalty looks like right now, what the rate environment is doing, and whether your lender even offers the product you need.

That’s why the first thing I do with any client asking this question is pull the actual numbers — the current penalty, the rate options, the setup costs, the lender constraints — and lay both scenarios side by side. No assumptions. No guessing.

If you’re sitting on equity and wondering whether to tap into it, reach out. We’ll run your numbers and figure out which structure actually saves you money — not which one just sounds simpler.

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