HELOC vs Second Mortgage in Canada (2026): When to Use Which

If you have substantial home equity but need to access it, you have two main borrowing options in Canada: a HELOC (Home Equity Line of Credit) or a second mortgage. They’re both secured by your home but they work very differently. Picking the wrong one costs thousands. Here’s the 2026 comparison.

HELOC: revolving credit secured by your home

A HELOC is essentially a credit card or line of credit, but with your home as collateral. The bank gives you an approved credit limit (typically up to 65% of your home value minus your primary mortgage balance). You can borrow, repay, borrow again — like any line of credit.

• Interest rate: Variable, typically Prime + 0.5% to Prime + 1.5%. At Prime 6.95%, that’s 7.45-8.45%.
• Payments: Interest-only payments allowed (no principal repayment required). Or you can pay down principal whenever you want.
• Setup costs: Legal fees + appraisal + registration = $1,000-$2,000 one-time
• Maximum limit: Total mortgage + HELOC can’t exceed 80% of home value (65% for HELOC portion alone)

Second mortgage: lump-sum amortized loan

A second mortgage is a separate mortgage loan, secured by your home but RANKING BELOW your primary mortgage. The bank holding your primary mortgage gets paid first in foreclosure; the second mortgage holder gets paid second. This makes second mortgages riskier for lenders, which means higher rates for you.

• Interest rate: 7-15% from B-lenders or private lenders (way higher than HELOC)
• Payments: Fixed monthly payment of principal + interest, amortized over the term
• Setup costs: $2,000-$5,000+ in legal, broker, appraisal fees
• Term: Usually 1-3 years (much shorter than primary mortgage)
• Maximum: Combined first + second mortgage typically capped at 90-95% of home value

Side-by-side: $50K need

When HELOC is the right tool

• Ongoing renovation project: draw money in stages as work progresses
• Emergency fund alternative: approved line you can tap if needed; only pay interest when used
• Tax-deductible investment borrowing: if you borrow from HELOC to invest in income-producing assets, interest is tax-deductible (Smith Manoeuvre strategy)
• Bridge financing: short-term gap between selling old home and buying new
• Business cash flow: self-employed using HELOC as working capital reserve

When a second mortgage makes more sense

• You can’t qualify for a HELOC: bad credit, recent job change, self-employed with thin paperwork — B-lenders will lend at higher rates
• Need exceeds HELOC limit: your combined first + HELOC at 80% LTV isn’t enough; second mortgage can go higher (with risk premium)
• Want forced discipline: fixed amortization makes you pay it down; HELOC interest-only allows the debt to linger forever
• Specific one-time large expense: debt consolidation, business buyout, divorce settlement — clear use, clear repayment plan

The HELOC trap: never paying down principal

HELOC’s biggest danger is its flexibility. With interest-only payments allowed, many Canadians borrow, never pay down principal, and carry the debt for decades. Net interest paid can equal the original principal over 15-20 years.

OSFI tightened rules in 2018 requiring banks to amortize HELOC principal over time (cap the interest-only period). But many borrowers still treat HELOCs as perpetual debt. Discipline matters.

The “readvanceable mortgage” hybrid

Some lenders (Scotiabank STEP, RBC Homeline, BMO ReadiLine) bundle your primary mortgage + HELOC into one product. As you pay down the mortgage, your HELOC limit automatically grows by the same amount. Convenient if you want easy access to equity as you build it.

Smith Manoeuvre fans use these explicitly: borrow from HELOC to invest in dividend stocks, deduct interest, pay down primary mortgage with dividends. Aggressive strategy, requires sophistication, not for everyone.

What about cash-out refinancing?

Third option: refinance your existing mortgage at a higher principal balance and take the difference as cash. Lower rate than HELOC or second mortgage (you get your primary mortgage rate), but you trigger the stress test on the entire new mortgage + may face break penalty on existing mortgage if you refinance mid-term.

Cash-out refinance often wins when: you’re due to renew anyway, you need a substantial amount ($100K+), you want lower rate over a HELOC. HELOC wins when: you need flexibility, lower amounts, or your existing mortgage has favorable terms.

The bottom line. For most homeowners with stable income and good credit, a HELOC is the better-priced and more flexible tool — keep it as standby liquidity. Second mortgages are mostly for borrowers who can’t qualify for HELOCs or who need a specific lump-sum financing event with clear repayment plan. Either way, treat home equity borrowing as serious debt — your house is collateral, defaults trigger foreclosure.