HELOC payment & interest
See interest-only servicing, amortized comparisons, and stress test prime adjustments.
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HELOC payment & interest
Model interest-only payments, compare an amortized overlay, and review prime sensitivity.
Calculation notes
Methodology for the heloc payment & interest
Calculate your Home Equity Line of Credit availability, payment requirements, and the true cost of borrowing against home equity.
See how much HELOC room you have based on home value, mortgage balance, and lender loan-to-value limits (65% standard, up to 80% combined).
Model HELOC interest costs and compare against refinancing, second mortgages, and personal loans for different borrowing scenarios.
Understand the flexibility and risks — HELOC access is powerful but interest-only minimum payments can extend repayment indefinitely.
Inputs to check
- Property value and mortgage balance
- HELOC rate and limit
- Interest-only vs amortized payments
Assumptions
- Standard HELOC limit: 65% of appraised home value minus outstanding mortgage balance.
- Combined mortgage + HELOC cannot exceed 80% of home value for most conventional lenders.
- HELOC interest is calculated daily at prime plus a spread, charged monthly.
- Interest-only minimum payments do not reduce principal — disciplined repayment is essential.
How this calculator works
Calculate your Home Equity Line of Credit availability, payment requirements, and the true cost of borrowing against home equity.
See how much HELOC room you have based on home value, mortgage balance, and lender loan-to-value limits (65% standard, up to 80% combined).
Model HELOC interest costs and compare against refinancing, second mortgages, and personal loans for different borrowing scenarios.
Understand the flexibility and risks — HELOC access is powerful but interest-only minimum payments can extend repayment indefinitely.
Inputs you will need
- Property value and mortgage balance
- HELOC rate and limit
- Interest-only vs amortized payments
Assumptions and limitations
- Standard HELOC limit: 65% of appraised home value minus outstanding mortgage balance.
- Combined mortgage + HELOC cannot exceed 80% of home value for most conventional lenders.
- HELOC interest is calculated daily at prime plus a spread, charged monthly.
- Interest-only minimum payments do not reduce principal — disciplined repayment is essential.
Example scenarios
Maximum HELOC availability
$700K home, $350K mortgage. Standard limit: 65% of value = $455K minus mortgage = $105K available. Some lenders allow up to 80% combined LTV with portion as term loan.
HELOC interest cost
$50K HELOC at prime + 0.50% (5.95%). Interest-only minimum: $248/month. Making only minimum payments means you never pay down principal — balance stays $50K forever.
HELOC vs refinance for renovation
$80K renovation: HELOC at 5.95% = $397/month minimum (interest-only). Refinance at 4.50% adds ~$405/month but includes principal repayment. Refinance forces payoff; HELOC offers flexibility.
HELOC as emergency fund
A $100K HELOC with zero balance costs nothing until drawn. Provides instant liquidity at competitive rates — but requires discipline not to use for discretionary spending.
Related tools
Turn this savings math into a refinancing decision
Use the break-even, penalty, or renewal output alongside the refinance and renewal playbooks so you compare timing, costs, and fallback options before you switch.
Guides
Read the Canada-specific playbook before you commit to the next step.
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Frequently asked questions
What is the maximum HELOC I can get?
Standard limit: 65% of appraised value minus outstanding mortgage. Combined mortgage + HELOC cannot exceed 80% of value. On $700K home with $350K mortgage: max HELOC = $455K - $350K = $105K. Total borrowing ($455K) is 65% LTV, within the 80% cap.
Is HELOC interest tax-deductible?
Only if borrowed funds are used to earn investment income. Using a HELOC for principal residence renovations is not deductible. Using it to invest in a non-registered account (Smith Manoeuvre) makes interest deductible. Always consult a tax accountant.
What is the difference between a HELOC and second mortgage?
A HELOC is revolving credit — draw and repay as needed, with interest-only minimums. A second mortgage is a fixed-term loan with scheduled principal and interest payments. HELOCs offer flexibility but higher rates and risk of perpetual debt.
Can the bank reduce or freeze my HELOC?
Yes. Lenders can reduce or freeze HELOC availability if home value declines, credit changes, or economic conditions deteriorate. During 2008 and 2020, some lenders froze unused HELOC portions without notice. Never rely on a HELOC as your only emergency fund.
How does a HELOC affect mortgage qualification?
A HELOC with zero balance has minimal impact — lenders may count a small portion of available credit in TDS. A HELOC with a balance is treated like any debt: the payment is included in TDS, reducing mortgage qualification for future purchases.