# How do lenders qualify four or more borrowers on one mortgage?

> Technically, most lenders allow up to 4 borrowers on a single residential mortgage.

Category: Strategy
Last verified: 2026-02-18
Source: https://ratellow.com/faqs/strategy/how-do-lenders-qualify-four-or-more-borrowers-on-one-mortgage

## Answer
Technically, most lenders allow up to 4 borrowers on a single residential mortgage. They will combine all incomes and all debts. However, the B-20 stress test applies to the SUM of all borrowers. This can be tricky if one family member has high personal debt (car loans, student loans) as it drags down the qualification for the entire group.

## Related guide
- https://ratellow.com/guides/multi-generational-garden-suite

## Sources
- FCAC Guide: Shared Homeownership — https://www.canada.ca/en/financial-consumer-agency/services/industry/laws-regulations/guideline-existing-mortgage-loans-exceptional-circumstances.html#toc3
- CMHC Multi-Unit Policy — https://assets.cmhc-schl.gc.ca/sf/project/cmhc/pdfs/factsheets/new/cmhc-quick-reference.pdf