The maximum credit limit a bank or credit union will approve for a HELOC depends on two primary metrics: your Combined Loan-to-Value (CLTV) and your Debt-to-Income (DTI) ratio.
1. The CLTV Rule Explained
Most institutional lenders cap total property financing at 80% to 85% of your home's certified appraisal value:
HELOC Maximum Borrowing Formula
Max HELOC = (Appraised Property Value × Max CLTV %) − Outstanding Mortgage Balance
2. Canadian vs. US HELOC Lending Rules
- United States: Lenders typically allow up to 85% CLTV (with select credit unions going up to 90%). Interest is tax-deductible if funds are used to substantially improve the residence.
- Canada (OSFI Rules): Under Canadian regulatory guidelines, a standalone HELOC cannot exceed 65% Loan-to-Value. When bundled with an existing mortgage in a collateral charge, the combined total can reach up to 80% LTV.
3. Underwriting Criteria for Approval
Beyond home equity, lenders verify your credit profile:
- Credit Score: 680 minimum for standard approval; 720+ for lowest margin above Prime.
- Debt-to-Income (DTI): Total monthly debt obligations including the new HELOC should not exceed 43% of gross income.
- Income Verification: 2 years of W-2s, tax returns, or notice of assessments (NOA in Canada).
🧮 Use the Free HELOC Calculator
Ready to run your real numbers? Use our full interactive calculator with current official rates, charts, and detailed schedules.
Open HELOC Calculator →