Income matters, but it is not the full answer
Gross income is where most mortgage affordability checks begin. Higher income can support a larger payment, but only if the rest of the budget is not already claimed by debt, childcare, transportation, taxes, insurance, and basic living costs.
Use household income carefully. A two-income household may qualify for more, but it can also carry more risk if one income stops. A variable-income worker should avoid using their best year as the base case.
The useful question is not just how much the bank may lend. It is what payment still works after savings, emergencies, repairs, and non-housing goals are funded.
Debt ratios set the lender ceiling
Canadian lenders use debt-service ratios to test whether your income can support the mortgage. Gross debt service looks at housing costs compared with gross income. Total debt service adds other debts such as car loans, credit cards, student loans, lines of credit, and other required payments.
These ratios are approval tools, not lifestyle tools. A household can pass a lender ratio and still feel squeezed if the rest of the budget is heavy.
| Ratio | What it includes | Why it matters |
|---|---|---|
| GDS | Mortgage principal and interest, property taxes, heating, and usually part of condo fees | Tests the housing load against gross income |
| TDS | GDS costs plus other required debt payments | Tests the full debt load against gross income |
| Your safe payment | Housing costs, debts, savings, repairs, life costs, and income risk | Tests whether the home works in real life |
Down payment changes the mortgage
The down payment reduces the mortgage amount. It can also change whether mortgage loan insurance is required. A larger down payment lowers the loan and interest cost, but using every dollar can leave you exposed after closing.
Current federal down-payment rules generally start at 5% for homes up to $500,000, then 10% on the portion above $500,000 up to $1.5 million, with 20% generally required at $1.5 million or more. Confirm the current rule before relying on it.
A bigger down payment is not automatically better if it destroys your emergency fund. Keep cash for closing costs, moving, repairs, and the first year of ownership.
Closing costs need cash
Closing costs are not optional extras. They are the cash costs needed to complete the purchase and move in. They can include land transfer tax or municipal transfer duties, legal or notary fees, title insurance, inspection, appraisal, adjustments for prepaid taxes or utilities, moving, setup costs, and sales tax on some new builds or insurance premiums.
Do not count every dollar of savings as down payment. If the down payment empties your account, the first repair, tax bill, or insurance surprise becomes debt.
- Set aside a closing-cost buffer before choosing the purchase price.
- Ask your lender, broker, lawyer, or notary for province-specific estimates.
- Budget separately for immediate repairs and basic setup costs.
Stress test basics
The mortgage stress test checks whether you could qualify at a higher rate than the contract rate. For uninsured mortgages at federally regulated lenders, OSFI currently lists the qualifying rate as the greater of the mortgage contract rate plus 2% or 5.25%.
The stress test affects how much you can borrow. It does not mean your actual payment will be calculated at that rate, but it does mean your approval is tested against a tougher payment.
Your personal stress test should go further: test a higher renewal rate, one lost income, higher condo fees, higher property taxes, and at least one major repair.
Property taxes, condo fees, and maintenance
Property taxes vary by municipality and property value. They can rise over time, and they are part of the real monthly ownership cost even when they are billed a few times per year.
Condo fees can make the mortgage look affordable while the total payment is not. A low condo fee is not always good; it may mean the building is underfunded. Review the status certificate or condo documents before treating the fee as stable.
Maintenance is the cost buyers most often understate. Houses need roofs, appliances, plumbing, heating, drainage, paint, landscaping, and occasional ugly surprises. Condos shift some maintenance to the building, but special assessments can still happen.
What monthly payment feels safe
A safe payment is not one number for every household. It depends on income stability, debt, dependants, car needs, retirement savings, emergency fund, and whether you would still be okay after a repair or job change.
One practical test: after the full housing cost is paid, can you still save, cover normal bills, handle annual costs, and avoid credit-card debt? If the answer depends on bonuses, overtime, roommates, or no repairs, the budget is fragile.
Use lender ratios as the outer boundary. Use your own monthly budget as the decision.
Example budgets
These examples are not recommendations. They show how the same income can support very different home prices once debt, condo fees, taxes, and repair risk are included.
| Household | Risk to check | What may be safer |
|---|---|---|
| Single buyer with stable salary and no debt | One income carries the full payment | Keep a larger cash buffer and avoid maxing the approval |
| Couple with two incomes and car loans | TDS can tighten quickly | Pay down consumer debt before increasing the purchase price |
| Buyer choosing a condo | Monthly fee and future special assessments | Add full condo fees to the real payment and review building documents |
| Family stretching for a detached home | Repairs, childcare, cars, and property tax can collide | Price the home using a repair reserve, not just the mortgage payment |
| Variable-income or self-employed buyer | Approval and real cash flow may not match | Use conservative income and keep a deeper emergency fund |