# How does OSFI's B-20 guideline affect mortgage underwriting and prepayment strategies?

> OSFI's B-20 guideline establishes standards for sound residential mortgage underwriting practices for federally regulated financial institutions (FRFIs), including borrower assessment and risk management .

Category: Strategy
Last verified: 2026-04-14
Source: https://ratellow.com/faqs/strategy/how-does-osfis-b-20-guideline-affect-mortgage-underwriting-and-prepayment-strategies

## Answer
OSFI's B-20 guideline establishes standards for sound residential mortgage underwriting practices for federally regulated financial institutions (FRFIs), including borrower assessment and risk management . The guideline aims to promote responsible lending and overall financial stability in Canada.

## Institutional highlights
- These rules apply only to federally regulated financial institutions (FRFIs), not all lenders in Canada.
- Lenders will check to see if you can comfortably manage your mortgage payments and other debts.
- You can't rely on mortgage insurance to get approved if you otherwise wouldn't qualify.
- Lenders are expected to carefully assess the mortgage insurance companies they work with.
- Lenders must follow careful and responsible practices when approving your mortgage.

## Related guide
- https://ratellow.com/guides/mortgage-prepayment-privileges

## Sources
- Mortgage Insurance Prepay and Re-Advance Policy — https://www.sagen.ca/ups/underwriting-documentation/#mortgage-insurance-prepay-and-re-advance-policy-638f55989d20b
- 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
- Page 2 — https://assets.cmhc-schl.gc.ca/sf/project/cmhc/pdfs/factsheets/new/cmhc-quick-reference.pdf#page=2
- Notes — https://www.bankofcanada.ca/rates/banking-and-financial-statistics/posted-interest-rates-offered-by-chartered-banks/#notes