Mortgage Stress Test Calculator
By Hami Tahm · Last reviewed July 2026
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This calculator applies the OSFI B-20 qualifying rate formula to your mortgage scenario and returns a pass/fail result, your maximum qualifying mortgage, and the income required. Enter your contract rate — the calculator does the rest. When you are comparing renewal offers at a higher contract rate, add a mortgage renewal calculator pass to see payment differences before you sign.
What is the mortgage stress test qualifying rate in Canada?
The Canadian mortgage stress test requires you to qualify at the higher of your contract rate plus 2% or 5.25% — whichever is greater. At a contract rate of 4.79%, your qualifying rate is 6.79%. At a contract rate of 3.00%, the 5.25% floor applies. This rule is set by OSFI under Guideline B-20 and applies to all federally regulated lenders across Canada.
New to homebuying?
This is step one of four. Instead of jumping between calculators, use the guided Homebuyer Journey — enter your numbers once and carry them through the stress test, monthly payment, down payment plan, and closing costs.
Learn what lenders require
Passing the stress test still requires documented income and a verified down payment. See accepted down payment sources and proof, mortgage income verification, and How to Qualify for a Mortgage in Canada.
Your credit score is one of the main qualifiers that influence mortgage approval
For an insured mortgage (under 20% down), CMHC's baseline is that at least one borrower needs a credit score around 600+ — but this is a floor, not a guarantee: individual lenders often layer their own, stricter minimums on top, and some expect every applicant on the application to clear their bar. Other insurers and lenders set their own minimums, and alternative lenders may go lower at higher rates. You can get your credit report free at my.equifax.ca — useful as a guideline, but different bureaus and scoring models mean it may not match the exact score your lender pulls. Educational guidance only — not a lender decision.
Your Income
Only your base salary or guaranteed hours belong here. Earn overtime, bonuses, or commission on top of this job? Add that separately below under "Part-time (non-guaranteed) / overtime / commission" — lenders qualify it differently.
This isn't your official mortgage score — lenders pull their own. For the most accurate picture, check your Equifax score.
This doesn't change the numbers here — it changes which lender programs you can use, which is a conversation for your mortgage professional.
Property & Mortgage
This is our starting rate, last reviewed August 10, 2026 — replace it with your own quote if you have one
Estimated current 5-year rates (for direction only, not a quote)
Insured mortgages often price lower than conventional ones despite the insurance premium — the lender takes on less risk. With 20%+ down you may also see "insurable" pricing that lands between these two. The very lowest advertised rates often come with restrictions — limited prepayments, steep penalties, no porting — that not everyone qualifies for or wants. Ask your broker for a quote and terms specific to you.
Monthly Housing Costs
Enter 0 if not a condo
Your Other Debts
These only affect your TDS. Get your GDS working first — if the home fits your income before debt, then we add debt to check TDS.
Not sure what to enter? A quick guide
- Only count the minimum payment shown on your credit report.
- Student loan or other deferred loan with no payment showing yet? Use at least 1–3% of the balance.
- Credit card or line of credit balance? Use 3% of the balance as the monthly payment.
- Paying a loan bi-weekly? Convert to monthly: payment × 26 ÷ 12.
Your GDS Works — Now Add Your Debts
At 6.79% your housing costs fit within the 39% GDS limit (36.62%). TDS isn't evaluated yet — enter your monthly debts below. No other debts? Use the “I have no other debts” button and your TDS will match your GDS exactly.
Qualification Ratios
GDS
Housing Costs / Income
$3,052 housing / $8,333 income
TDS
All Debts / Income
Add your monthly debts below to evaluate TDS.
39% GDS / 44% TDS is a benchmark, not a hard cap
These are the CMHC-insured maximums, used here as the standard screen. With 20% down, you may have options to qualify at higher debt ratios — this tool shows the benchmark case. Either way, this is a ratio screen, not a lender approval: credit, income verification, and property still apply.
Payment Comparison
The monthly buffer the stress test protects against: $437/month (difference between your contract payment and the payment at the OSFI qualifying rate of 6.79%).
(at stress test rate)
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Key Takeaways
- The stress test qualifying rate is the higher of your contract rate + 2% or 5.25%. At a 4.79% contract rate, you qualify at 6.79%.
- The stress test reduces your maximum affordable mortgage by approximately 15–20% compared to qualifying at your actual contract rate.
- The stress test does NOT apply when renewing with the same lender. As of November 21, 2024, it also does not apply when uninsured mortgage holders switch lenders at renewal (same loan amount and amortization).
- OSFI's B-20 guideline governs the stress test for all federally regulated lenders. It has been in place since 2018 and was last adjusted in June 2021 (floor raised from 4.79% to 5.25%).
- If the stress test reduces your maximum below your target, options include: increasing your down payment, adding a co-borrower, extending amortization, or targeting a lower price.
What Is the Mortgage Stress Test in Canada?
The Canadian mortgage stress test, governed by OSFI's B-20 guideline, requires borrowers to prove they can afford their mortgage at a qualifying rate higher than their actual contract rate. You must qualify at the greater of your contract rate plus 2% or the minimum qualifying rate of 5.25%. This rule applies to all federally regulated lenders — every major bank in Canada.
The stress test was introduced in its current form in 2018 to ensure Canadian borrowers have a financial buffer against rising interest rates. OSFI last revised the minimum qualifying rate floor in June 2021, raising it from 4.79% to 5.25%, where it has remained since. The stress test is a federal rule and applies uniformly across all provinces.
The OSFI B-20 Qualifying Rate
Stress Test Qualifying Rate Formula
Who Is Subject to the Stress Test?
The stress test applies to all borrowers at federally regulated lenders — Schedule I and II banks (RBC, TD, BMO, Scotiabank, CIBC, National Bank, and others), as well as federally chartered trust companies. This covers the vast majority of Canadian mortgages. Provincial credit unions are governed by provincial rules, not OSFI B-20, so their stress test requirements may vary. Private and alternative lenders are not required to apply the OSFI stress test, though many set their own qualification standards.
How to Calculate the Mortgage Stress Test
To calculate your stress test qualifying rate, add 2% to your lender's offered contract rate, then compare to 5.25% and use whichever is higher. At a contract rate of 4.79%, the qualifying rate is 6.79%. Your lender then uses this rate to assess whether your income — measured by GDS and TDS ratios — can support the higher qualifying payment. Your Gross Debt Service (GDS) ratio must not exceed 39% and your Total Debt Service (TDS) ratio must not exceed 44% at the qualifying rate.
Stress Test Qualifying Rate — Quick Reference
| Contract Rate | Qualifying Rate | Floor Applies? | Buffer |
|---|---|---|---|
| 2.50% | 5.25% | Yes — floor applies | +2.75% |
| 3.00% | 5.25% | Yes — floor applies | +2.25% |
| 3.25% | 5.25% | Yes — at floor | +2.00% |
| 4.00% | 6.00% | No — contract + 2% | +2.00% |
| 4.79% | 6.79% | No — contract + 2% | +2.00% |
| 5.50% | 7.50% | No — contract + 2% | +2.00% |
| 6.00% | 8.00% | No — contract + 2% | +2.00% |
The buffer column shows the difference between qualifying rate and contract rate. Above 3.25%, the buffer is always exactly 2% (contract + 2% always exceeds 5.25%). Below 3.25%, the floor creates a larger buffer — protecting against rate shock if rates rise significantly.
How Much Does the Stress Test Reduce Your Buying Power?
The mortgage stress test typically reduces your maximum affordable mortgage by 15–20% compared to qualifying at your actual contract rate. On a household income of $120,000, the stress test at a 6.79% qualifying rate reduces the maximum mortgage from approximately $640,000 (at 4.79%) to approximately $530,000 — a reduction of roughly $110,000. This is the core financial impact most borrowers notice.
Buying Power Before and After the Stress Test
| Household Income | Contract Rate | Stress Test Rate | Max @ Contract | Max @ Stress Test | Reduction |
|---|---|---|---|---|---|
| $80,000 | 4.79% | 6.79% | $425,000 | $355,000 | −$70,000 (−16%) |
| $100,000 | 4.79% | 6.79% | $535,000 | $445,000 | −$90,000 (−17%) |
| $120,000 | 4.79% | 6.79% | $640,000 | $530,000 | −$110,000 (−17%) |
| $150,000 | 4.79% | 6.79% | $800,000 | $665,000 | −$135,000 (−17%) |
Options If the Stress Test Reduces Your Maximum Below Target
If the stress test reduces your qualifying mortgage below your target purchase price, several paths can help. A larger down payment reduces the required mortgage amount directly. Adding a co-borrower increases combined income used in GDS/TDS calculations. Extending amortization to 30 years (available with 20% or more down) reduces the monthly qualifying payment. Paying down existing debts before applying reduces your TDS ratio. Finally, targeting a lower purchase price or waiting for lower contract rates — which increase your qualifying maximum — are both effective strategies.
Use the Mortgage Affordability Calculator to model these scenarios with your actual income and debt profile.
When Does the Stress Test NOT Apply?
The mortgage stress test does not apply in three main situations: same-lender renewals, uninsured straight switches at renewal (as of November 21, 2024), and mortgages at non-federally regulated lenders (provincial credit unions and private lenders).
Mortgage Renewals — Same Lender Exemption
Renewal Exemption — Updated November 21, 2024
Switching Lenders at Renewal
Renewal switch rules now reduce requalification friction for both insured and qualifying uninsured borrowers. For insured mortgages, the Canadian Mortgage Charter says insured mortgage holders are not required to requalify under the insured minimum qualifying rate when switching lenders at renewal. For uninsured mortgages, OSFI's Nov. 21, 2024 update removes the prescribed MQR for straight switches where the loan amount and amortization are not increased. Refinances, equity take-out, or extended amortizations still require full qualification.
Refinances
Refinancing always triggers the stress test — even with the same lender. A refinance involves changing the loan amount (accessing equity), which is treated as a new application. If you are refinancing to access home equity or change your amortization, you must qualify at the stress test rate. This applies regardless of whether you stay with your current lender or move to a new one.
Is the Mortgage Stress Test Going Away?
As of May 2026, there is no indication that OSFI plans to eliminate the mortgage stress test. OSFI reviews its B-20 guideline periodically and has adjusted the qualifying rate floor in the past — most recently in June 2021 when it was raised from 4.79% to 5.25%. The stress test is considered a core pillar of Canada's financial stability framework.
OSFI's loan-to-income (LTI) limits are now in force as a portfolio-level supplement for newly originated uninsured mortgages. They limit how much high-LTI lending a regulated institution can hold in its portfolio; they are not a hard borrower-by-borrower cap and do not replace the stress test. See OSFI's OSFI Guideline B-20 mortgage underwriting rules for the latest official updates, or our mortgage stress test guide for a fuller explanation of how the rules have evolved.
The OSFI Stress Test — What Borrowers Need to Know
OSFI — the Office of the Superintendent of Financial Institutions — is Canada's federal regulator for banks and federally incorporated financial institutions. Its B-20 guideline (Residential Mortgage Underwriting Practices and Procedures) sets the stress test qualifying rate for all federally regulated lenders. The stress test in its current form was implemented in January 2018 and is the primary affordability safeguard for the Canadian mortgage market.
The OSFI stress test applies to federally chartered banks and trust companies. Provincial credit unions are regulated by their respective provincial bodies — most have voluntarily adopted similar stress test standards, but the specific rules may vary. Private and alternative lenders (MICs, mortgage finance companies) are not required to apply OSFI B-20, though they set their own underwriting criteria. If you are working with a broker who sources from multiple lender types, confirm the applicable qualification standard.
How Lenders Qualify Your Income
The income a lender counts — often called qualifying income — is not always the same as what you earn. Lenders usually distinguish between guaranteed income and variable income. Salary and guaranteed hours may be used when documented. Overtime, bonus, commission, casual, seasonal, and non-guaranteed part-time income usually need a two-year history, and lenders often use the lower of the latest year or the two-year average. Self-employed income typically requires two years of NOA/T1 support; some insurer guidelines allow a 15% gross-up or eligible add-backs. Non-taxable income and benefits such as the Canada Child Benefit may be treated differently by lender and insurer.
What lenders ask for
Prime lenders typically require two forms of employment confirmation. For employees this is usually a recently dated letter of employment (signed and dated) plus a recent pay stub that backs up the letter. Self-employed applicants are usually asked for two years of NOAs and T1s or financial statements.
| Income type | How it is typically treated |
|---|---|
| Salary / guaranteed hours | Generally used as documented (letter of employment, pay stub, T4/NOA). |
| Overtime, bonus, commission | Usually needs a 2-year history; lenders often use the lower of the latest year or the 2-year average. |
| Casual / seasonal / non-guaranteed part-time | Treated as variable income — typically requires a 2-year history before it counts. Recent casual income may count as $0 until then. |
| Self-employed | Typically 2 years of NOA/T1 support; some insurer guidelines allow a 15% gross-up or eligible add-backs (e.g. CCA). |
| Non-taxable income (e.g. disability, WSIB) | May be grossed up under insurer guidelines (commonly ~25–35%) with documentation confirming it is non-taxable. |
| Canada Child Benefit (CCB) | Some insurers accept it with limits — e.g. capped as a share of qualifying income and requiring the benefit to continue for years after funding. |
| Probationary employment | Depends on the lender's own probation policy and due diligence — not a universal yes or no. Odds of approval increase significantly with prior history in the same occupation. |
| Term / contract positions | Often assessed on your history with the employer or in the occupation, similar to probation — both are usually approved on an exception basis. |
A common surprise
Someone who started a casual or non-guaranteed position six months ago — even working 50 hours a week — may have that income counted as $0 until a two-year history exists. If your situation involves variable income, probation, or benefits, confirm with a licensed mortgage broker how much of your income a lender will actually use before you set your budget.
Rules differ between lenders and mortgage insurers (CMHC, Sagen, Canada Guaranty) and change over time — this calculator and guide are educational, not a lender approval. Sources: Sagen underwriting policies and the FCAC guide to preparing for a mortgage.
Frequently Asked Questions
The mortgage stress test estimates and qualifying rate calculations on this page are for general informational purposes only and do not constitute financial or mortgage advice. Actual qualification is determined by your lender based on your complete financial profile, the property, and current lender policies. Consult a licensed mortgage professional for advice specific to your situation.
Sources
- OSFI — B-20 Residential Mortgage Underwriting Practices and Procedures
- OSFI — Minimum Qualifying Rate for Uninsured Mortgages (includes Nov 21, 2024 lender-switch exemption)
- CMHC mortgage loan insurance minimum down payment rules
- FCAC mortgage stress test and affordability ratios
- OSFI minimum qualifying rate for uninsured mortgages
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