HELOC Calculator
Calculate your Home Equity Line of Credit borrowing limit under Canadian OSFI guidelines (65% revolving sub-cap and 80% maximum CLTV), monthly interest-only payments, rate stress testing, and debt consolidation savings.
Property & Mortgage Equity
OSFI B-20 RulesEnter $0 if your home is fully paid off with no outstanding liens.
Under Canadian banking regulations (OSFI B-20), you can borrow up to a revolving line of credit of $300,000, bringing your total combined debt to $680,000 (80% LTV).
Variable Rate Sensitivity & Stress Test ($75,000 Drawn)
Monthly InterestUnder CRA income tax rules, interest paid on borrowed funds is 100% tax-deductible if the capital is directly invested to generate taxable investment income (such as dividend-paying Canadian stocks, REITs, or rental properties). Interest used for personal living or consumer goods is not deductible.
With a readvanceable collateral mortgage (e.g. RBC Homeline, Scotiabank STEP, TD FlexLine), every dollar of principal you pay down on your regular mortgage automatically increases your HELOC borrowing limit dollar-for-dollar up to the 65% sub-cap.
What is a HELOC and How Does Home Equity Borrowing Work?
A Home Equity Line of Credit (HELOC) is one of the most powerful and flexible financial instruments available to Canadian homeowners. It is a revolving line of credit secured against the equity in your home—the market value of your property minus any outstanding mortgage balance.
Unlike a traditional mortgage or personal loan that disburses a fixed lump sum with mandatory monthly principal payments, a HELOC operates much like a giant, low-interest credit card. You are approved for a maximum credit limit, but you only borrow what you need, when you need it. You only pay interest on the exact balance you have drawn, and once you pay the balance down, your credit limit is replenished without needing to reapply.
The Canadian 65% and 80% LTV Rules Explained (OSFI Guideline B-20)
In Canada, the Office of the Superintendent of Financial Institutions (OSFI) sets strict regulatory limits on how federally regulated banks (such as RBC, TD, Scotiabank, BMO, and CIBC) can lend against home equity:
Maximum Total Debt Limit
The total amount of all loans secured against your home (your first mortgage + your HELOC) cannot exceed 80% of your home's fair market value. You must always maintain at least 20% home equity as a financial buffer.
Maximum Revolving HELOC Limit
The revolving, interest-only HELOC portion alone is capped at 65% of the property's value. Any borrowing between 65% and 80% must be structured as an amortizing fixed or variable mortgage segment.
| Home Value | Mortgage Balance | Max Combined Debt (80%) | Max Revolving HELOC (65% Cap) | Available New HELOC Limit |
|---|---|---|---|---|
| $600,000 | $250,000 | $480,000 | $390,000 | +$140,000 |
| $850,000 | $380,000 | $680,000 | $552,500 | +$172,500 |
| $1,200,000 | $450,000 | $960,000 | $780,000 | +$330,000 |
| $800,000 | $0 (Paid Off) | $640,000 | $520,000 | +$520,000 |
How HELOC Payments Work: Draw Period vs. Amortization
Understanding the distinction between interest-only payments and principal reduction is critical for managing your HELOC safely:
During the draw period, your required monthly payment equals only the interest accrued:Monthly Payment = Drawn Balance × (Annual Rate ÷ 12)
On a $100,000 balance at 5.95%, your payment is approximately $495.83 per month. You are not building equity, but your cash flow commitment remains low.
To prevent long-term debt accumulation, savvy borrowers use an amortization schedule (e.g. 15 or 20 years) to systematically pay down both principal and interest. You can also lock portions of your HELOC into fixed-rate amortizing mortgage terms at any time.
Advanced Financial Strategies: Debt Consolidation & The Smith Manoeuvre
1. High-Interest Debt Consolidation
Unsecured credit cards in Canada carry interest rates of 19.99% to 22.99%, and personal lines of credit often charge 10% to 14%. By borrowing against your home equity at Prime + 0.50% (approx. 5.95%), you can consolidate your expensive debts, slashing your interest expenses by over 70% and saving thousands of dollars every year.
2. The Smith Manoeuvre (Tax Strategy)
Under CRA Income Tax Act provisions (Paragraph 20(1)(c)), interest on borrowed money is 100% tax-deductible if the funds are directly invested in taxable income-producing assets (such as Canadian dividend stocks or real estate). The Smith Manoeuvre leverages a readvanceable mortgage to transform non-deductible mortgage debt into deductible investment debt, accelerating wealth creation.
Real-World HELOC Scenarios
Legal Basement Apartment
A couple in Hamilton with an $850,000 home and $380,000 mortgage accessed a $160,000 HELOC. They drew $85,000 to build a basement rental unit that generates $1,800/month, easily covering the $420/month interest payment.
Credit Card Payoff
A homeowner in Calgary owed $30,000 across two credit cards at 19.99% ($500/month interest). Using a 5.95% HELOC, their monthly interest plummeted to $148.75, saving over $4,200 annually.
Emergency Reserve Fund
Retirees in Ottawa with a paid-off $750,000 home established a $487,500 HELOC (65% LTV). Keeping a $0 drawn balance costs nothing, serving as standby emergency liquidity without selling investments during market downturns.
Frequently Asked Questions About HELOCs
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Open toolThis HELOC Calculator calculates borrowing limits in compliance with OSFI Guideline B-20 rules (65% revolving sub-cap and 80% maximum CLTV) for residential properties in Canada. Actual credit approval, borrowing limits, and interest rates depend on individual property appraisal, credit score, debt service ratios (GDS/TDS), and lender underwriting criteria. CalcVault is not a lender, mortgage brokerage, or financial advisory firm.