Updated: April 2025  |  bremo.io financial guides

Debt-to-Income Ratio in Canada: What Lenders Look For

Your credit score gets most of the attention when it comes to loan approval, but your debt-to-income ratio (DTI) is equally important — and sometimes the deciding factor when a lender is on the fence. Understanding what DTI is, how lenders calculate it, and what you can do to improve it before applying for a loan can significantly improve your chances of approval and the rate you're offered.

How to Calculate Your Debt-to-Income Ratio

The formula is straightforward:

DTI = Total Monthly Debt Payments ÷ Gross Monthly Income × 100

For example:

• Gross monthly income: $6,000
• Monthly debt payments: mortgage $1,400 + car loan $350 + credit card minimums $150 = $1,900
• DTI = $1,900 ÷ $6,000 × 100 = 31.7%

Note: use gross income (before taxes and deductions), not net (take-home) income. Lenders use gross income as the standard.

What Counts as "Debt Payments"?

Include all recurring debt obligations:

• Mortgage or rent (lenders include rent even though it's not technically debt)
• Car loan payments
• Personal loan payments
• Student loan payments
• Credit card minimum payments
• Line of credit minimum payments
• Any other installment loan payments
• Child support or alimony payments (in some lender assessments)

Do not include: utility bills, insurance premiums, groceries, or other living expenses. DTI is about debt payments specifically.

DTI Thresholds: What Lenders in Canada Use

Personal Loans and Unsecured Credit

For personal loans, banks and online lenders generally use these rough benchmarks:

• Under 35%: Good — most lenders will approve
• 35–43%: Acceptable — approval likely but may affect rate
• 43–50%: Caution zone — many lenders will decline; some alternative lenders may proceed
• Over 50%: High risk — mainstream lenders typically decline; subprime lenders may approve at high rates

Mortgage Lending: GDS and TDS Ratios

For mortgages in Canada, lenders use two specific DTI variants defined by OSFI (Office of the Superintendent of Financial Institutions):

• Gross Debt Service (GDS) ratio: Housing costs only (mortgage principal + interest + property taxes + 50% of condo fees) ÷ gross income. Maximum 39% under standard guidelines.
• Total Debt Service (TDS) ratio: All debt payments including housing costs ÷ gross income. Maximum 44% under standard guidelines.

These mortgage-specific ratios are strictly enforced by federally regulated lenders under Canada's stress test rules.

Why DTI Matters Beyond Credit Score

A high credit score doesn't automatically mean a lender will approve a new loan if your DTI is already stretched. Consider: someone earning $5,000/month with a 750 credit score but $2,200 in existing monthly debt payments (44% DTI) presents more repayment risk than someone with a 680 score but only $1,000 in monthly debt obligations (20% DTI). Income available to repay new debt matters as much as credit history.

How Adding a New Loan Affects Your DTI

Lenders calculate your DTI including the new loan you're applying for. If your current DTI is 32% and the new loan would add $300/month, your post-loan DTI would be approximately 37% (assuming $6,000 gross income: ($1,920 + $300) ÷ $6,000 = 37%). If this pushes you into the caution zone, the lender may offer a smaller loan amount or a shorter term to keep the ratio acceptable.

How to Improve Your Debt-to-Income Ratio

There are only two levers: reduce debt payments or increase income. Both are easier said than done, but here are practical approaches:

Reduce Debt Payments

• Pay off the highest-payment debt first: Focus extra cash on the debt with the largest monthly obligation (often a credit card) to eliminate it entirely
• Refinance existing debt at lower rates: A lower rate on an existing loan reduces the monthly payment
• Extend the term of existing loans: This reduces monthly payments but increases total interest — only do this strategically, not as a default habit
• Avoid taking on any new debt before applying

Increase Income

• A second job or freelance income that can be documented (typically needs 2 years of history for lenders to count it)
• Rental income from a property you own (counted at 50–80% of gross rent by many lenders)
• A raise or promotion that appears on recent pay stubs
• Adding a co-borrower with income — their income is included in the DTI calculation, potentially making the ratio much more favorable

DTI vs. Credit Utilization: What's the Difference?

These are related but distinct concepts:

• DTI: A lender's assessment tool — monthly debt payments as a share of income. Not directly part of your credit score.
• Credit utilization: How much of your revolving credit limits you're using. Directly impacts your credit score (about 30% of the calculation).

You can have excellent credit utilization (e.g., using only 10% of your credit card limits) but a poor DTI if your income is low relative to your total debt payments. And vice versa. Both matter — lenders look at both.

Self-Employed Borrowers and DTI

If you're self-employed, calculating your DTI from a lender's perspective is more complex. Lenders typically use your net business income from tax returns, often averaged over two years. If you aggressively deduct business expenses (reducing taxable income), your declared income may be much lower than your actual cash flow — which hurts your DTI in lender calculations.

Some lenders offer "stated income" products for self-employed borrowers, but these come with higher rates. Alternatively, building a solid relationship with a credit union that does relationship-based underwriting can help self-employed borrowers get fair assessments.

Quick Reference: Target DTI Before Applying for a Loan

• Personal loan: aim for under 40% DTI (including the new payment)
• Mortgage: aim for under 39% GDS and under 44% TDS
• Car loan: most lenders want total DTI under 45–50%
• Line of credit: same as personal loan guidelines