The connection between an HPI release and an individual owner's financial position runs through three mechanisms: appraisal-based borrowing limits, refinance loan-to-value caps, and property tax assessments. Each one is sensitive to current market value, and each one tightens when values come down.
HELOC Capacity Is Tied to Current Value, Not Original Price
A home equity line of credit is capped at a share of the home's current appraised value, not what was paid for it. According to the Financial Consumer Agency of Canada, homeowners may borrow up to 65% of the home's value through a HELOC, with the limit calculated from a current appraisal. The 65% cap is set by OSFI's B-20 Mortgage Underwriting Guideline; borrowers who want to reach 80% loan-to-value must do so through an amortizing mortgage product, not revolving credit.
Run the arithmetic on a Toronto home that appraised at $1.4 million in 2022 and would appraise at roughly $1.11 million today (a 20.7% from-peak adjustment, before considering renovations or condition). With an existing $700,000 mortgage, the HELOC room shifts from $210,000 in 2022 (65% of $1.4M, less the mortgage) to roughly $21,500 today. The mechanics did not change. The denominator did.
The same logic applies to qualifying for a HELOC in the first place. FCAC's guidance requires at least 20% equity for a HELOC combined with a mortgage, or more than 35% for a standalone HELOC, plus a mortgage-style stress test. Owners whose equity has been compressed by a double-digit from-peak decline may discover at renewal that the math no longer clears those thresholds, regardless of income.
Refinances Are Bounded by 80% Loan-to-Value
Refinancing is similarly anchored to current appraised value. The CMHC Mortgage Loan Insurance Quick Reference sets the maximum insured loan-to-value at 80% for owner-occupied homeowner refinance loans on 1–2 unit properties, alongside standard debt-service limits (GDS 39% / TDS 44%). An 80% LTV on a lower appraisal yields a lower allowable refinance balance. Owners who counted on consolidating debt or pulling equity into a renewed mortgage will find the absolute ceiling has come down with the index.
This is the part of the cycle where appraisal disputes start to matter. Lenders order their own appraisals; owners often have no visibility into the comparable sales the appraiser used. For owners in the Ontario CMAs sitting more than 20% below peak, asking the lender for the appraisal report — and the comparable sales pulled — is a reasonable first step when the number comes back lower than expected.
Property Tax Assessments Are a Separate Lever
Falling market values do not automatically translate into lower property tax bills. Ontario's Municipal Property Assessment Corporation administers the assessment roll that municipalities use to calculate property tax. Owners who believe the assessed value or classification on their Property Assessment Notice is wrong can file a Request for Reconsideration (RfR) free of charge. For residential, farm, and managed forest properties, an RfR decision is required before any appeal can proceed to the Assessment Review Board.
In markets where the index is 20–28% below peak, the case for filing an RfR — at least to understand the comparables MPAC used — is stronger than it was during the 2022 highs. Property tax is the one homeowner cost where a falling market value can produce a real reduction, but only if the owner takes the procedural step to challenge the existing assessment.