# Underwriting Guidelines and OSFI B-20: Renewal Hill Foundations

> Federally Regulated Financial Institutions (FRFIs) adhere to OSFI's Guideline B-20, establishing standards for prudent residential mortgage underwriting.

Category: Newcomers
Last verified: 2026-02-18
Source: https://ratellow.com/faqs/newcomers/underwriting-guidelines-and-osfi-b-20-renewal-hill-foundations

## Answer
Federally Regulated Financial Institutions (FRFIs) adhere to OSFI's Guideline B-20, establishing standards for prudent residential mortgage underwriting. This encompasses rigorous assessment of borrower identity, background, credit history, and debt servicing capacity. OSFI mandates sound risk management and internal controls within FRFIs.

## Related guide
- https://ratellow.com/guides/newcomer-canada-mortgage

## Sources
- Page 3 — https://assets.cmhc-schl.gc.ca/sf/project/cmhc/pdfs/factsheets/new/cmhc-quick-reference.pdf#page=3
- Page 2 — https://assets.cmhc-schl.gc.ca/sf/project/cmhc/pdfs/factsheets/new/cmhc-quick-reference.pdf#page=2
- I. Purpose and scope of the guideline — https://www.osfi-bsif.gc.ca/en/guidance/guidance-library/residential-mortgage-underwriting-practices-procedures-guideline-2017#1.0
- Canada Guaranty — https://www.canadaguaranty.ca/lenders/underwriting-guidelines/