How Much Mortgage Can You Afford in Canada? Three Limits Decide It
The rate you negotiate decides what you pay. It has little to do with what you are allowed to borrow. How much mortgage you can afford in Canada is largely settled before you ever see a rate sheet, by three separate rules that sit between a household and a lender. Whichever one binds first is your real budget.
The three limits are:
1. The stress test. You qualify at a rate higher than the one you will pay. 2. GDS and TDS. Housing costs and total debts each cap out at a share of gross income. 3. The minimum down payment. It has a cliff in it, not a slope.
Most coverage explains one and stops. The rules below are those in force as of September 9, 2026, and the dollar comparisons in the tables are our own calculations applying those published rules, not figures any agency publishes.
Limit 1: you qualify at a rate you will not pay
Canada’s stress test is a minimum qualifying rate. In OSFI’s words, it is “The greater of the mortgage contract rate plus 2% or 5.25%.” The buffer, currently 2%, is “a safety margin that shows that borrowers can absorb some negative impacts to their finances.” The floor, currently 5.25%, “accounts for risks that can emerge from changes in the broader economy.” OSFI reviews both at least annually and obliges federally regulated lenders to apply the test to uninsured mortgages, meaning a down payment of 20% or more. Buyers putting down less are stress tested under the mortgage insurance rules rather than OSFI’s, and FCAC states the same two components for borrowers generally, so the arithmetic below holds either way.
What the test actually costs
Assume a household budgeting $3,000 a month for principal and interest over a 25-year amortization, with interest compounded semi-annually as Canadian mortgages are. The qualifying rate is the greater of contract plus 2% and the 5.25% floor.
| Contract rate | Qualifying rate | Mortgage at contract rate | Mortgage you qualify for | Borrowing power lost |
|---|---|---|---|---|
| 2.50% | 5.25% (floor binds) | $669,693.34 | $503,424.95 | $166,268.39 (24.83%) |
| 4.00% | 6.00% | $570,320.30 | $468,891.68 | $101,428.62 (17.78%) |
| 5.00% | 7.00% | $515,814.01 | $428,317.04 | $87,496.97 (16.96%) |
| 6.00% | 8.00% | $468,891.68 | $393,074.83 | $75,816.84 (16.17%) |
Two things fall out of it.
The 5.25% floor only binds below a 3.25% contract rate. Above that, contract plus 2% is always larger and the floor does nothing. It mattered enormously in 2021 and is inert in most markets since.
The test costs proportionally more when rates are low. It takes 24.83% of borrowing power at a 2.50% contract rate against 16.17% at 6.00%. Part of that gap is the floor binding at 2.50%, but the effect survives without it: the same 2-point buffer costs 17.78% at 4.00% and 16.17% at 6.00%, because a fixed two-point increase is a smaller proportional shock the higher rates already are.
Note what the test does not do. Our 4.00% borrower qualifies for $468,891.68, and the payment on that mortgage at their actual 4.00% contract rate is $2,466.46, not the $3,000 they budgeted. The stress test never raises your payment. It lowers your loan.
One exemption is easy to miss. OSFI does “not expect lenders to apply the minimum qualifying rate for uninsured straight switches at renewal,” meaning a move between federally regulated lenders with no increase to the amortization period or the loan amount. That took effect on November 21, 2024. Renewing with your existing lender never required requalifying; what changed is that moving your business elsewhere at renewal no longer does either, provided you are not borrowing more or stretching the amortization.
Limit 2: 39% for the house, 44% for everything
The second limit is a pair of ratios. CMHC states them:
> “Your total monthly housing costs, including Principal, Interest, Property Taxes, Heating (P.I.T.H.), the annual site lease in the case of leasehold tenure and 50% of applicable condominium fees, shouldn’t represent more than 39%* of your gross household income (Gross Debt Service (GDS) ratio).”
> “Your total debt load shouldn’t be more than 44%* of your gross household income.”
Total Debt Service is P.I.T.H., plus the site lease and half the condo fees where they apply, plus payments on all other debt, over gross annual household income. CMHC attaches a qualifier note to both percentages. FCAC’s mortgage guidance gives the same ratios and adds a softener: “You may still qualify for a mortgage even if your GDS ratio is slightly higher. However, you’re increasing the risk of taking on more debt than you can afford.”
The structural point is the gap between the two. GDS counts the house and only the house. TDS counts that plus every other payment you make, and it is only five points wider. A car loan does not change your GDS at all. It eats your TDS room dollar for dollar. Two households with identical incomes and identical stress-tested rates get different answers because of debts unrelated to the property. If a lender’s number comes back lower than you expected and your income is solid, look at the other debts before you look at the house.
Limit 3: the down payment, and the cliff at $1.5 million
The minimum is tiered:
- Purchase price of $500,000 or less: 5% of the price.
- Between $500,000 and $1.5 million: 5% of the first $500,000, plus 10% of the portion above it.
- Above that: 20% of the whole price.
FCAC’s worked example on a $600,000 home: 5% of the first $500,000 is $25,000, plus 10% of the remaining $100,000 is $10,000, for $35,000. That middle tier is why “5% down” is a phrase to distrust. On a $700,000 home the minimum is $45,000, which is 6.43% of the price.
The cliff
The third tier is a threshold, not a slope. CMHC requires that “the maximum purchase price / lending value or as-improved property value must be below $1,500,000 for homeowner loans and $1,000,000 for small rental loans.” Below the line the tiered minimum applies and the loan can be insured. At the line the home is not insurable, so 20% of the whole price becomes the floor.
| Purchase price | Minimum down payment |
|---|---|
| $1,499,999 | $124,999.90 |
| $1,500,000 | $300,000.00 |
One more dollar of purchase price requires $175,000.10 more cash, with no gradient and no partial relief above the line. The federal government raised this cap from $1 million on December 15, 2024, so the cliff moved. It did not soften.
What the insurance costs
Under 20% down the loan must be insured, and the premium scales with loan-to-value. CMHC’s published rates:
| Loan-to-value | Premium on total loan |
|---|---|
| Up to and including 65% | 0.60% |
| 65.01% to 75% | 1.70% |
| 75.01% to 80% | 2.40% |
| 80.01% to 85% | 2.80% |
| 85.01% to 90% | 3.10% |
| 90.01% to 95% | 4.00% |
| 90.01% to 95% with non-traditional down payment | 4.50% |
Applied to that $700,000 home:
| Down payment | Loan | Loan-to-value | Premium rate | Premium |
|---|---|---|---|---|
| $45,000 (the minimum) | $655,000 | 93.57% | 4.00% | $26,200.00 |
| $70,000 (10%) | $630,000 | 90.00% | 3.10% | $19,530.00 |
| $105,000 (15%) | $595,000 | 85.00% | 2.80% | $16,660.00 |
| $140,000 (20%) | $560,000 | 80.00% | none | none |
Going from the $45,000 minimum to $70,000 costs $25,000 more up front and saves $6,670.00 of premium, because it crosses a rate band as well as cutting the balance. Reaching $140,000 removes the premium entirely. Two footnotes: premiums in Quebec, Ontario and Saskatchewan attract provincial sales tax, which cannot be added to the loan, and rolling the premium into the mortgage means you pay interest on it. CMHC also puts closing costs at 1.5% to 4% of the purchase price.
Where the cash comes from
A traditional down payment comes from savings, the sale of a property, or a non-repayable gift from a relative, and two registered accounts exist to build the first of those. The First Home Savings Account takes up to $8,000 a year to a $40,000 lifetime limit, described by the government as “Tax-free in; tax-free out.” The Home Buyers’ Plan lets a first-time buyer withdraw up to $60,000 from an RRSP, raised from $35,000 in Budget 2024, and the two can be combined.
Knowing the target is one thing. Reaching it is the harder half, and we have looked at how long a first-home down payment takes to save at realistic contribution rates.
Twenty-five years or thirty
With under 20% down, FCAC caps amortization at 30 years for a first-time buyer and/or a buyer of a new build, and 25 years in all other cases. With 20% or more down, your lender sets the maximum. The 30-year option came into force on December 15, 2024.
On a $500,000 mortgage at 4.00%, the 25-year payment is $2,630.10 and total interest is $289,030.31. Over 30 years the payment falls to $2,377.59 and total interest rises to $355,933.66. That is $252.51 a month saved and $66,903.35 more paid.
The trade is defensible if the lower payment is what gets you past GDS. It is expensive if it simply buys more house. FCAC is blunt: “Think twice before extending your amortization to lower your payments. The interest costs that you’ll need to pay will be higher. This may add up to thousands or tens of thousands of dollars.”
Why Canadian mortgage math is not American
Every figure above uses semi-annual compounding, which is not a stylistic choice. Section 6 of the Interest Act provides that no interest is chargeable, payable or recoverable on the principal advanced unless the mortgage states the principal and the rate of interest “calculated yearly or half-yearly, not in advance.” A Canadian fixed-rate mortgage is therefore quoted on a rate compounded semi-annually, and a calculator built on the American monthly convention will overstate your payment.
One check against a published figure. FCAC works through a $400,000 home with 5% down at 4.00% over 25 years, giving a $395,200 mortgage including the premium and a total cost of $643,649. The same case on the semi-annual convention gives $643,649.56, a difference of 56 cents. That validates our method against the government’s own arithmetic, and nothing more.
New builds carry a rebate resale homes do not
If the home is newly built, one more number enters. Under the first-time home buyers’ GST/HST rebate, CRA says an eligible buyer “could recover up to 100% of the GST (or federal portion of the HST) paid, up to $50,000.” At or below $1 million the rebate is up to 100%, to that $50,000 maximum. Between $1 million and $1.5 million it is gradually reduced. At or above $1.5 million there is none. CRA’s own example: a $1.25 million home is the mid-point of the range and qualifies for 50% of the maximum, a rebate of $25,000.
The limit most coverage buries: it applies to a newly built or substantially renovated home, an owner-built home or a co-op share. Not a resale home. The agreement with the builder must be entered into on or after March 20, 2025 and before 2031, construction must begin before 2031, and the home must be substantially completed before 2036. First-time here means neither you nor your spouse or common-law partner has lived in a home either of you owned, in or outside Canada, as a primary residence in the current calendar year or the previous four, and neither has received the rebate before. In Ontario, CRA notes you may also be eligible for a rebate of some of the 8% provincial part of the HST.
Note that $1.5 million is now a threshold in two separate federal rules. Above it a mortgage cannot be insured, and above it the GST rebate is zero. We have no source saying the two were coordinated, but the same number governs both.
Which limit binds you
Work out all three and take the smallest.
- Strong income, clean balance sheet, 20% or more saved. The stress test binds, and the bite is largest when rates are low.
- Solid income, a car loan or student debt. TDS binds, because other payments consume the five points between GDS and TDS without touching the housing side.
- Buying near $1.5 million, or under 20% saved. The down payment binds, and near the cap it binds hard.
Two things to check before you talk to a lender. Total every recurring debt payment in the household and see how much of the 44% is gone before the house enters the equation. And if your target price is near $1.5 million, price the same home at $1,499,999 and at $1,500,000, then decide which side of that line you are shopping on.
Disclaimer: The content on bestcanadianstocks.ca is for informational and entertainment purposes only and does not constitute financial advice. Past performance is not indicative of future results. Always consult a qualified financial advisor before making investment decisions. The minimum qualifying rate, its 2% buffer and 5.25% floor, and the straight-switch exemption from the Office of the Superintendent of Financial Institutions; the gross and total debt service ratios, the insured mortgage cap and the mortgage loan insurance premium schedule from Canada Mortgage and Housing Corporation; the minimum down payment tiers and the maximum amortization periods from the Financial Consumer Agency of Canada; the semi-annual compounding requirement from section 6 of the Interest Act; the first-time home buyers’ GST/HST rebate amounts and eligibility from the Canada Revenue Agency; the December 2024 mortgage reforms from the Department of Finance. All sources retrieved September 9, 2026. The dollar comparisons in the tables are our own calculations applying those published rules.
