What is the difference between B-20 and the stress test?

The stress test is one requirement within Guideline B-20. B-20 is the broader set of underwriting rules covering income verification, loan-to-value limits, and documentation, with the stress test being its most well-known component.

Does B-20 apply to all lenders?

No. B-20 applies to federally regulated lenders like the big banks. Some provincially regulated credit unions and private lenders are not bound by it, though many voluntarily apply similar standards.

Why do I have to qualify at a higher rate?

B-20 requires the stress test so that you can still afford your mortgage if rates rise. You qualify at the greater of your contract rate plus 2% or 5.25%, even though you pay your actual contract rate.

Mortgage Glossary

What is B-20 Guideline?

B-20 is the residential mortgage underwriting guideline issued by OSFI, Canada's federal banking regulator, that sets the rules federally regulated lenders must follow when approving mortgages. It is the home of the mortgage stress test and covers how lenders verify income, assess borrowers, and document loans. It applies to banks and other federally regulated lenders.

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Quick answer

Also known as: B-20, OSFI B-20, Guideline B-20

Key points

B-20 is OSFI's underwriting guideline for federally regulated mortgage lenders.
It is the home of the mortgage stress test.
Borrowers qualify at the greater of contract rate plus 2% or 5.25%.
It covers income verification, loan-to-value limits, and documentation.
It applies to banks but not necessarily to credit unions or private lenders.
Its goal is to keep borrowers and the financial system resilient to rate changes.

B-20 Guideline explained

Guideline B-20 is OSFI's framework for sound residential mortgage underwriting at federally regulated financial institutions, such as the big banks. It requires lenders to verify a borrower's identity, income, and ability to repay, to set prudent loan-to-value limits, and to apply a qualifying rate when assessing affordability. The stress test, which requires borrowers to qualify at a rate higher than their actual contract rate, lives within B-20.

Under B-20, borrowers must qualify at the greater of their contract rate plus 2% or a minimum qualifying rate of 5.25%. Because B-20 applies only to federally regulated lenders, some provincially regulated lenders, like certain credit unions, and private lenders may not be bound by it, though many apply similar standards.

What a B-20 Guideline is for

B-20 exists to keep the mortgage system stable by making sure lenders approve borrowers who can withstand higher rates and changing circumstances, not just today's payment. By standardizing underwriting and embedding the stress test, it reduces the risk of widespread defaults if rates rise or incomes fall. It protects both lenders and the broader financial system.

How it can help you

Knowing how B-20 works helps you understand why you must qualify at a higher rate than you will actually pay, and why your approved amount may be lower than expected. It also explains why provincially regulated or private lenders sometimes offer different qualifying rules. Lenderoo shops 40+ lenders for free, including options outside the big banks, so you can find a lender whose underwriting fits your situation.

When it comes up

B-20 comes into play whenever you apply for a mortgage at a bank. Even if you can clearly afford the payment at, say, a 5% contract rate, B-20's stress test requires you to qualify at a higher rate, which can reduce your maximum mortgage. Borrowers who fall just short sometimes look to credit unions or other lenders not bound by B-20.

Example: Qualifying under B-20

Suppose a bank offers you a contract rate of 5%. Under B-20's stress test, you must qualify at the greater of your contract rate plus 2% (7%) or the 5.25% floor, so here you qualify at 7%.

That means the bank tests whether your income can support payments as if your rate were 7%, even though you will actually pay 5%. The result is a lower maximum mortgage than your real payment alone would suggest, which is exactly what B-20 is designed to ensure.

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Questions & answers

B-20 Guideline: frequently asked questions

Common questions Canadians ask about b-20 guideline.

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Related mortgage terms

Stress Test

A federal qualifying rule that requires borrowers to prove they could afford payments at a higher rate than their actual contract rate.

Read definition

Lender

A financial institution or company that provides the money for a mortgage.

Read definition

Pre-Approval

Conditional approval for a mortgage before house hunting.

Read definition

Debt Service Ratio

The percentage of gross income needed to cover debt payments

Read definition

Monoline Lender

A lender that offers only mortgages, usually working through brokers rather than retail branches.

Read definition

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Mortgage Glossary

What is B-20 Guideline?

Find my best mortgage Back to glossary

Quick answer

Also known as: B-20, OSFI B-20, Guideline B-20

Key points

B-20 is OSFI's underwriting guideline for federally regulated mortgage lenders.
It is the home of the mortgage stress test.
Borrowers qualify at the greater of contract rate plus 2% or 5.25%.
It covers income verification, loan-to-value limits, and documentation.
It applies to banks but not necessarily to credit unions or private lenders.
Its goal is to keep borrowers and the financial system resilient to rate changes.

B-20 Guideline explained

What a B-20 Guideline is for

How it can help you

When it comes up

Example: Qualifying under B-20

Suppose a bank offers you a contract rate of 5%. Under B-20's stress test, you must qualify at the greater of your contract rate plus 2% (7%) or the 5.25% floor, so here you qualify at 7%.

Have a question about b-20 guideline?

Lenderoo shops 40+ lenders for free and matches you with a mortgage professional who explains every term — and finds your best rate.

Get pre-approved free Talk to an expert

Questions & answers

B-20 Guideline: frequently asked questions

Common questions Canadians ask about b-20 guideline.

Keep learning

Back to full glossary

Understand your mortgage with confidence

Lenderoo shops 40+ lenders for free and pairs you with a mortgage professional who keeps the jargon simple — and gets you a great rate.

Find my best mortgage Explore the glossary