What Is TDSR and Why It Matters When Applying for Credit in Canada

If you're applying for a mortgage, personal loan, or line of credit in Canada, you'll quickly hear one term over and over: TDSR. Short for Total Debt Service Ratio, this metric is one of the key things bankers and lenders look at when deciding whether to approve your credit application.
Let’s break down what TDSR is, how it’s calculated, what benchmarks banks use, and how you can improve it to boost your approval chances.
What Is TDSR?
TDSR stands for Total Debt Service Ratio. It’s the percentage of your gross monthly income that goes toward paying all of your monthly debt obligations, including:
- Mortgage or rent
- Property taxes
- Credit card minimum payments
- Car loans or leases
- Lines of credit
- Student loans
Formula:
TDSR = (Total Monthly Debt Payments / Gross Monthly Income) x 100
Example:
If your gross monthly income is $5,000 and your total debt payments are $1,800:
TDSR = ($1,800 / $5,000) x 100 = 36%
Why Does TDSR Matter?
TDSR helps banks evaluate how leveraged you are and whether you can comfortably handle additional debt.
Most lenders in Canada prefer to see a TDSR of 40% or less. Anything above that signals higher risk, and your chances of approval may drop — especially if your credit score or income stability are borderline.
GDSR vs. TDSR: What’s the Difference?
You might also hear about GDSR (Gross Debt Service Ratio). This metric only looks at your housing-related costs:
- Mortgage or rent
- Property taxes
- Utilities
- 50% of condo fees (if applicable)
While GDSR is mostly used for mortgage approval, TDSR is used more broadly for all kinds of credit.
What’s a Healthy TDSR?
TDSR Range | Risk Level | Likely Outcome |
---|---|---|
0–28% | Low Risk | Strong chance of approval |
29–35% | Moderate Risk | Approval depends on credit history |
36–40% | Borderline | Higher scrutiny by lenders |
41%+ | High Risk | Likely rejection unless mitigated |
How to Improve Your TDSR
- Pay down existing debts (especially high-interest credit cards)
- Avoid new credit applications before applying for large loans
- Increase your income (consider freelance or side work if applicable)
- Refinance or consolidate loans for lower monthly payments
Final Thoughts
Understanding your TDSR can help you better prepare for any credit application, from a mortgage to a personal line of credit. It’s one of the most important numbers your banker will review.
Want to make sure you’re talking to the right banker for your credit needs? Check out our guide to finding the right banker in Canada — and skip the guesswork next time you visit (or skip) the branch.

