Plain-language definition
What does High-ratio mortgage mean?
A residential mortgage where the loan exceeds 80% of the property’s lending value or purchase price under applicable rules, normally requiring mortgage default insurance.
Practical significance
Why it matters in a mortgage file
It matters because a lender finances an acceptable, insurable and marketable property—not merely a borrower or purchase price.
The exact treatment depends on the lender, property, borrower profile, transaction structure and governing documents. A term used conversationally may be narrower or broader than the meaning used in a commitment, registered charge, appraisal, insurer guideline or statute.
For the broader transaction framework, read What a Mortgage Is and How to Use This Guide.
Underwriting perspective
How professionals apply the concept
In underwriting, high-ratio mortgage is not reviewed in isolation. The professional must identify the source document or policy controlling the term, verify the underlying facts, assess how it affects risk or qualification, and document any exception or assumption. For legal, tax, accounting or appraisal questions, the appropriate professional's opinion should control.
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This entry is general educational information. Mortgage rules and lender policies can change, and the result depends on the complete application and transaction. It is not legal, tax, accounting, appraisal, investment or financial advice.