How Much Can I Borrow for a Mortgage in Canada?

How much can I borrow for a mortgage? There is no single number you can look up, because the maximum depends on your income, your existing debts, your down payment, and the rate a lender must use to test your payments under the federal stress test. Lenders calculate a ceiling; the amount you should actually borrow is usually lower than that ceiling.

What lenders are really measuring

A lender is asking one question: if this borrower's income fell or rates rose, could they still carry the home? To answer it, the lender projects your gross income, tallies the housing costs the property will carry, adds your other debts, and runs the totals through two debt-service ratios. Those ratios are the GDS and TDS ratios, and they are the backbone of every mortgage approval in Canada.

Two borrowers with identical salaries can be offered very different maximums. Credit history, the size of the down payment, whether the mortgage is insured, the property type, and even the lender's own risk appetite all shift the number. That is why comparing pre-approvals from several lenders is worth the effort rather than accepting the first number you are given.

Lenders also treat insured and uninsured mortgages differently. An insured loan, where the down payment is below 20%, must satisfy federal insurance rules on top of the lender's own policy. An uninsured loan is governed by the lender and by the regulator's underwriting expectations, which can allow slightly different limits. The practical effect is that two lenders can reach different answers for the same borrower.

The income and debt math

The gross debt service ratio looks at housing costs as a share of gross income. The total debt service ratio adds everything else you owe. Both use income before tax, not take-home pay.

• Housing costs — mortgage principal and interest, property taxes, heating, and half of any condo fees.
• Other debts — credit card minimums, car loans or leases, lines of credit, student loans, and support payments.
• Income — salary, guaranteed bonuses, and, for some borrowers, rental income and part-time earnings.

Not all income counts equally. A base salary is treated as reliable, while overtime, commissions, and bonuses may be averaged over a period or discounted entirely until there is a track record. Rental income is often counted at only a portion of the gross rent. If your income is variable, expect the lender to use a conservative figure, which lowers your maximum.

If your ratios exceed the lender's limits, the maximum loan shrinks. Paying down a credit card or a car loan before you apply can raise your borrowing room more than shopping for a slightly lower rate, because debt reduction changes the ratio directly.

How the stress test shrinks your maximum

Federally regulated lenders must confirm you could afford payments at a qualifying rate that is higher than the rate you actually sign. Under the federal stress test, that rate is the higher of your contract rate plus two percentage points or a published qualifying-rate floor. The mortgage stress test does not change your real payment, but it can cut how much you are allowed to borrow, because the lender tests a larger payment against the same income.

The floor and the two-point buffer are set by regulation and can change over time. Confirm the current qualifying rate with OSFI, CMHC, or your lender before you rely on any estimate. A rate hold from one lender may also produce a different maximum than a pre-approval from another, because the qualifying rate used can differ.

Down payment, insurance, and the loan cap

Your down payment sets the loan-to-value ratio and, with it, whether the loan must be insured. Below 20% down, the lender normally requires mortgage default insurance, and the premium is added to the balance, which slightly increases what you owe. Insured loans also carry their own price ceilings and amortization rules. A larger down payment lowers the loan, removes the insurance premium, and often improves the rate you are offered.

Why your real ceiling is lower than the maximum

A maximum approval is the point at which a lender is still willing to lend, not the point at which you are comfortable. Approvals often leave little room for a job change, a repair, or a rate increase at renewal. Many buyers choose a purchase price below their maximum and keep a cushion, then use the mortgage affordability calculator to see how different payments feel.

There is also a difference between what a lender will approve and what a seller will accept. In a competitive market your maximum matters, but so does your deposit, your conditions, and how quickly you can close. Being approved for more than you plan to spend is a negotiating position, not a target.

Ways to increase how much you can borrow

1. Pay down revolving debt such as credit cards and lines of credit, which weigh heavily on the TDS ratio.
2. Save a larger down payment to reduce the loan and the insurance cost.
3. Add a co-borrower whose income and credit strengthen the application.
4. Choose a longer amortization to lower the tested payment, if you can still meet the rules.
5. Improve your credit score before applying, since a stronger file can widen the terms available to you.

None of these steps guarantees a larger approval, because every lender sets its own limits. They do, however, move the math in your favour and give you more choice when you negotiate. Start by understanding the basics of how a mortgage works, then build the strongest file you can before you apply.