How Much Mortgage Can I Afford?

How to Use the Mortgage Qualifier Calculator

The mortgage qualifier calculator uses the same rules a Canadian lender applies: GDS and TDS debt ratios calculated at the OSFI stress test qualifying rate. Enter four inputs to get your approval estimate in real time.

Step 1 — Enter gross annual income

Enter your total gross annual household income before taxes. Include all income sources that lenders will verify: employment income, confirmed bonuses, self-employment income (typically averaged over 2 years), and rental income (lenders usually count 50% of gross rental income toward TDS). Do not enter net or after-tax income — lenders always use gross figures. To estimate take-home pay from gross income, use our Canadian income tax calculator.

Step 2 — Add monthly debt obligations

Enter total monthly minimum payments on all existing debts: car loans, credit cards (minimum payment only), student loans, lines of credit, and any other recurring obligations. Do not include rent or the proposed mortgage payment — those are accounted for separately in the GDS/TDS calculation. Note: many lenders count approximately 3% of your outstanding credit card balance as a monthly obligation regardless of what you actually pay; the exact rate varies by lender.

Step 3 — Input down payment

Enter the amount you plan to put down. The minimum down payment in Canada is 5% for homes priced under $500,000; for homes between $500,000 and $1,499,999, it is 5% on the first $500,000 and 10% on the remainder; homes at $1,500,000 or above require 20% (CMHC insurance is not available above this threshold). A larger down payment reduces your required mortgage and your CMHC premium if applicable.

Step 4 — Review your maximum mortgage and purchase price

The calculator outputs your maximum qualifying mortgage (the GDS- or TDS-constrained ceiling at the stress test rate), your estimated monthly payment at your contract rate, your maximum purchase price (mortgage + down payment), and your GDS and TDS percentages. The binding constraint badge tells you whether GDS or TDS is limiting your approval.

How Much Mortgage Can I Afford? — The Key Factors

How much mortgage you can afford in Canada is determined by four factors lenders measure: gross income, existing debts, down payment, and the stress test qualifying rate. The GDS and TDS ratios translate these inputs into hard dollar limits. For the full qualification framework — credit score, down payment, stress test, GDS/TDS ratios — see our complete guide on how to qualify for a mortgage in Canada.

GDS ratio — what it means and how it's calculated

The Gross Debt Service ratio measures housing costs as a percentage of gross income. Housing costs include: your mortgage payment (at the stress test qualifying rate), property tax, heat, and 50% of condo fees if applicable. The GDS formula: (Mortgage payment + Property tax + Heat + 50% condo fees) ÷ Gross monthly income × 100. CMHC insured-mortgage limits are 39% GDS and 44% TDS. Some lenders apply a stricter internal 32% GDS as a conservative practice.

TDS ratio — how your debts affect qualification

The Total Debt Service ratio adds all other monthly debt obligations to the GDS components. TDS formula: (All GDS components + Car loans + Credit cards + Student loans + Other debts) ÷ Gross monthly income × 100. The TDS limit is 44%. Every dollar of monthly debt reduces your qualification headroom: $500/month in car payments removes roughly $80,000–$90,000 from your maximum mortgage at current qualifying rates.

Down payment and CMHC insurance thresholds

Down payment affects both your mortgage amount and whether CMHC insurance applies. Below 20%, CMHC mortgage loan insurance is required — the premium (up to 4% of the mortgage) is added to your mortgage amount. Above 20% (conventional mortgage), no CMHC premium applies and 30-year amortization becomes available, reducing your monthly payment. As of December 2024, CMHC insures mortgages up to a purchase price of $1,499,999 — homes at $1,500,000 or above require conventional financing with a minimum 20% down payment.

How the stress test reduces your qualifying amount

The OSFI B-20 stress test requires lenders to qualify you at a rate higher than your actual contract rate — the greater of your contract rate plus 2%, or the OSFI minimum qualifying rate floor (currently 5.25%). On a $100,000 income with a 5% contract rate: qualifying at 5% produces a maximum mortgage of approximately $454,000. After the stress test at 7%, the ceiling drops to approximately $377,000. The stress test typically reduces approval by 15–20%.

How Banks Qualify You for a Mortgage in Canada

Canadian banks qualify mortgage applicants using two debt service ratios — GDS and TDS — calculated at the stress test qualifying rate. The bank approves the lower of the GDS-constrained and TDS-constrained maximums.

GDS ratio — formula and example

GDS = (Monthly mortgage payment at qualifying rate + Property tax + Heat + 50% condo fees) ÷ Gross monthly income × 100. CMHC insured-mortgage cap: 39%. Example: $7,500 gross monthly income, $400 property tax, $150 heat. GDS limit (39%): $2,925 available for housing costs. With $550 in tax and heat, the qualifying mortgage payment ceiling is $2,375/month — supporting approximately $400,000 in mortgage at a 7% qualifying rate over 25 years.

TDS ratio — formula and example

TDS = (All GDS components + All other monthly debt payments) ÷ Gross monthly income × 100. CMHC insured-mortgage cap: 44%. Using the same $7,500 income: TDS limit allows $3,300/month for all debt obligations combined. If this borrower has a $500/month car loan, the remaining $2,800 must cover housing costs — lower than the GDS ceiling of $2,925, so TDS becomes the binding constraint.

How the stress test qualifying rate is applied

Qualifying rate = MAX(contract rate + 2%, 5.25% floor). At a 5% contract rate: MAX(7%, 5.25%) = 7%. All GDS and TDS calculations use this 7% qualifying rate, not 5%. At a 3% contract rate: MAX(5%, 5.25%) = 5.25% floor applies. Important exemption: some provincially regulated credit unions are not subject to OSFI B-20 and may qualify you without the stress test — this typically results in higher approval amounts but also higher rates.

What lenders look at beyond the ratios

Beyond GDS/TDS, lenders review: credit score (generally 680+ for best rates; some lenders accept 600+), employment stability (salaried vs. contract vs. self-employed affects income verification requirements), down payment source (gifted down payments from immediate family are accepted; borrowed down payments affect TDS), and property type (some lenders restrict approval on rural, leasehold, or non-standard properties). This calculator models the ratio-based rules only — a lender may decline even a calculator-eligible file on other grounds.

What Is the Mortgage Qualifying Rate in Canada?

The mortgage qualifying rate in Canada is the rate used in the stress test — the higher of your lender's contract rate plus 2%, or the OSFI minimum qualifying rate floor (currently 5.25%, fixed by OSFI since June 2021). You are qualified at this rate even if your actual mortgage rate is lower.

Why the qualifying rate exists — the stress test backstory

OSFI introduced the B-20 stress test for uninsured mortgages in January 2018 and applied it to insured mortgages in 2016. The rationale: mortgage rates fluctuate over a 5-year term, and borrowers who qualify at a rock-bottom rate may not be able to afford payments if rates rise at renewal. The stress test forces borrowers to demonstrate they can carry the mortgage at a meaningfully higher rate — a buffer against rate shock.

How a higher qualifying rate affects your maximum mortgage

Each 1% increase in the qualifying rate reduces maximum mortgage approval by roughly 8–10%. At a $120,000 household income with no other debts: qualifying at 5.25% → approximately $560,000 maximum mortgage; qualifying at 6.5% → approximately $490,000; qualifying at 7.0% → approximately $455,000. The stress test alone accounts for a $100,000+ difference compared to qualifying at the contract rate.

When the floor rate changes and how to check it

OSFI publishes the minimum qualifying rate (MQR) for uninsured mortgages. Since June 2021, OSFI's floor has been fixed at 5.25%. The qualifying rate is the greater of your contract rate + 2% or 5.25%. To verify the current floor, check the OSFI minimum qualifying rate page. This calculator uses the floor — if your contract rate is higher than 3.25%, your qualifying rate will be your contract rate + 2%.

How to Pre-Qualify for a Mortgage in Canada

To pre-qualify for a mortgage in Canada, a lender reviews your gross income, monthly debts, down payment, and credit score, then applies GDS and TDS ratio limits at the stress test qualifying rate. Pre-qualification is an informal first step — no documents are verified and no credit check is required.

Pre-qualification vs. pre-approval — the difference

Pre-qualification is a self-reported estimate: you provide income, debts, and down payment numbers; a broker or tool runs them through GDS/TDS math. No credit pull, no income verification. Pre-approval is a formal application: the lender pulls your credit bureau, verifies income documents (T4s, NOAs, pay stubs), and issues a conditional commitment letter with a rate hold. Pre-approval carries far more weight with sellers — a pre-qualification alone is not sufficient for a competitive offer in most Canadian markets.

What documents you need to pre-qualify

For a formal pre-approval (beyond a calculator estimate), lenders typically require: T4 slips and/or Notices of Assessment for the past 2 years, recent pay stubs (within 30 days), employment letter on company letterhead, bank statements showing down payment (90 days of history), and statement of liabilities. Self-employed borrowers need 2 years of T1 General returns and corporate financial statements if incorporated.

How pre-approval amounts are calculated

Pre-approval amounts follow the same GDS/TDS rules as this calculator — the lender runs your verified numbers through the stress test and issues a maximum. The conditional letter typically specifies a maximum purchase price, not a specific property. The pre-approval is conditional on the property appraisal, title search, and no material changes to your income or debts before closing.

How long does a mortgage pre-approval last in Canada?

Most major Canadian lenders hold pre-approval rates for 90 to 120 days (RBC, TD, Scotiabank, and CIBC typically offer 120 days). During the hold period, if rates fall below your locked rate, you generally get the lower rate — if rates rise, your locked rate is protected. After expiry, the lender re-qualifies you at current rates and conditions. If you are close to expiry and still searching, contact your broker to request a renewal before the hold lapses.

Income Required for a $700K and $800K Mortgage

To qualify for an $800,000 mortgage in Canada, you generally need a gross annual household income of approximately $152,000–$163,000, depending on amortization and debts. For a $700,000 mortgage, the range is approximately $135,000–$145,000. These figures use the 5.25% stress test floor and CMHC's 39% insured GDS cap — if your contract rate pushes the qualifying rate above 5.25%, or your lender applies a stricter internal 32% cap, income requirements increase.

Assumptions: 5.25% qualifying rate (stress test floor), Canadian semi-annual compounding, property tax + heat = $550/month, GDS cap 39% (CMHC insured-mortgage maximum). Income shown is minimum gross annual household income required with no other debts unless noted.

How additional debts reduce your qualifying income threshold

When monthly debts are high enough to make TDS the binding constraint (above approximately $1,650/month at $145,000 income at the 39% GDS cap), every additional dollar of monthly debt raises the required income further. A borrower targeting a $700K mortgage with $1,000/month in existing debts needs approximately $158,000 in gross household income — $13,000 more than the no-debt scenario — because TDS has become the binding constraint. Use the calculator above to model your specific debt load.

Canadian Qualifier Plus — The 4× Income Rule

The "4× income rule" is an informal Canadian mortgage qualifier heuristic: multiply your gross annual household income by 4 to estimate a rough maximum mortgage. On a $120,000 income, this gives a $480,000 mortgage estimate ($120,000 × 4 = $480,000). Some practitioners use 4.5× for borrowers with minimal debt.

Why the 4× rule understates or overstates for many borrowers

The 4× rule ignores three material factors. First, it doesn't apply the stress test qualifying rate — the actual qualifying ceiling can be 15–20% lower at current rates. Second, it ignores existing monthly debts: even $400/month in car payments can reduce approval by $60,000–$80,000. Third, it ignores property tax and heat assumptions that vary by market — a $550/month tax-and-heat assumption in Calgary vs. $800/month in Toronto produces meaningfully different GDS ceilings.

When the 4× rule is useful as a first estimate

The 4× rule works as a rough back-of-envelope check when you have no existing debts, plan a standard 20–25% down payment, and are in an early stage of planning. At $150,000 household income, 4× = $600,000 gives you a reasonable ballpark before diving into GDS/TDS math. For anything more precise — especially if you carry car debt, student loans, or credit card balances — use this calculator.

CMHC Mortgage Qualifier — Owner-Occupied Rules

CMHC-insured mortgages apply to owner-occupied properties with a purchase price under $1,500,000 and a down payment below 20%. CMHC insurance allows lenders to extend higher loan-to-value mortgages that they otherwise could not legally fund — in exchange, the borrower pays an insurance premium added to the mortgage principal.

CMHC insurance and how it affects qualifying

When CMHC insurance applies, the insurance premium is added to your mortgage balance — not paid at closing. At 5% down, the CMHC premium is 4% of the mortgage amount. This increases your total mortgage and monthly payment slightly, and reduces the home price your income can support. Example: $500,000 home, 5% down → $475,000 mortgage → $19,000 CMHC premium → $494,000 total insured mortgage. The calculator reflects CMHC when your down payment is below 20%.

CMHC purchase price cap — current limit

As of December 15, 2024, CMHC mortgage loan insurance is available for homes with a purchase price under $1,500,000. Homes at or above $1,500,000 require a conventional mortgage with a minimum 20% down payment — CMHC insurance is not available regardless of down payment size. For homes between $500,000 and $1,499,999, the federal blended minimum applies: 5% on the first $500,000 plus 10% on the remainder. Use the Down Payment Calculator to model your minimum and CMHC premium.

Mortgage Qualifier vs. Major Bank Calculators

RBC, TD, Scotiabank, CIBC, BMO, and the FCAC all offer online mortgage qualifier calculators. These tools use the same underlying GDS/TDS ratio framework and OSFI stress test rules — the inputs and outputs are largely the same. The key differences are in default assumptions for property tax and heat.

RBC mortgage qualifier — how it compares

The RBC mortgage qualifier calculator uses the standard GDS/TDS framework with a 120-day rate hold on pre-approval. RBC and other Canadian banks follow CMHC's 39% GDS and 44% TDS limits for insured mortgages, though many apply a stricter internal 32% GDS as a conservative approval threshold. RBC's tool is widely used and generally produces results consistent with this calculator within 3–5%.

TD mortgage qualifier — key inputs

TD's mortgage affordability calculator applies the same stress test and ratio rules. TD is known for conservative property tax defaults that can make their calculator show slightly lower approvals than peers in lower-tax provinces. The "TD mortgage — how much can I afford" searches land on TD's affordability tool, which models the buyer-side budget question — similar to our mortgage affordability calculator.

Scotiabank, CIBC, and FCAC mortgage qualifier tools

Scotiabank's "What Can I Afford" calculator and CIBC's mortgage qualifier apply standard OSFI stress test rules. The Financial Consumer Agency of Canada (FCAC) also provides a government mortgage qualifier tool at canada.ca — this is the most neutral reference, as it has no product attached. All of these tools produce comparable results because they follow the same regulatory framework. Use any as a cross-check; verify inputs match before comparing outputs.

Mortgage Qualifier vs. Mortgage Affordability — What's the Difference?

Many homebuyers discover they can qualify for significantly more than they can comfortably afford. A $180,000 income household may qualify for a $750,000 mortgage — but after taxes, retirement contributions, childcare, car costs, and a reasonable savings buffer, the actual affordable payment may support only a $550,000–$600,000 mortgage. Using your maximum qualifier as your purchase budget is a common and costly mistake.

Use this calculator to understand your lender's ceiling. Then use the mortgage affordability calculator to find your personal floor — the number that lets you keep your financial life intact after the purchase. The right mortgage is somewhere between the two.

Debt-to-Income Ratio and Mortgage Qualification

In Canada, lenders use GDS and TDS ratios rather than a single debt-to-income ratio (DTI) as used in the United States. The TDS ratio is the closest Canadian equivalent to DTI: it measures total monthly debt payments (including the proposed mortgage) as a percentage of gross monthly income, capped at 44%.

How to calculate your TDS ratio

TDS = (Monthly mortgage P&I at qualifying rate + Property tax + Heat + 50% condo fees + All other monthly debt payments) ÷ Gross monthly income × 100. Example: $8,000 gross monthly income; $2,200 mortgage P&I; $400 tax; $150 heat; $400 car loan. TDS = ($2,200 + $400 + $150 + $400) / $8,000 × 100 = 39.4% — within the 44% limit.

Which debts count toward TDS

Canadian lenders include: car loans (minimum payment), personal loans, student loans, lines of credit (minimum or roughly 3% of balance), credit cards (typically about 3% of outstanding balance — not your minimum payment), child support and alimony payments. The exact percentage varies by lender. Lenders do not include: utilities (beyond heat), groceries, insurance premiums, subscription services, or living expenses. The credit card treatment is important: a $30,000 credit card balance can add roughly $900/month to your TDS calculation under the common 3% rule, regardless of what you actually pay each month.

How to improve your TDS ratio before applying

The most effective moves to improve your TDS ratio before a mortgage application: pay down high-balance credit cards (under the common 3% rule, $10,000 paid off reduces TDS by roughly $300/month); pay off or consolidate smaller loans to reduce the minimum payment count; avoid taking on new debt obligations in the 6–12 months before application; and if applicable, add a co-borrower whose income increases the TDS headroom more than their debts erode it.

Frequently Asked Questions