How does my debt-to-income ratio affect
mortgage approval?
Will your debt make lenders slam the door on your mortgage? Read this and act.
What is debt-to-income (DTI) and why lenders care
DTI = (monthly debt payments ÷ gross monthly income) × 100. Simple math. Lenders use DTI to measure how much of your income is already spoken for. High DTI = higher risk. That affects mortgage approval, interest rates, and how much you can borrow.
How DTI is checked (quick and clear)
- Lenders review pay stubs, T4s (Canada) or W-2s (US), tax returns for self-employed borrowers, bank statements, and your credit report.
- They total monthly obligations: rent, car payments, minimum credit card payments, student loans, support payments, and the proposed mortgage payment.
- Then they divide by your gross monthly income to get the DTI.
Target DTI numbers you should know
- Canada (common rules): GDS (housing) ≤ 39%, TDS (total debt) ≤ 44% for insured mortgages. Lenders vary for uninsured deals.
- USA (typical rules): front-end ~28% of gross income for housing; back-end ~36% total debts. Many lenders will go to 43% and some government programs accept up to ~50% with compensating factors.
Aim: keep total DTI under 40% to open the most doors. Under 36% is ideal.
Real examples
- Income $6,000/month, monthly debts $1,800. DTI = 1,800 ÷ 6,000 = 0.30 → 30% DTI. Strong.
- Same income, debts $2,800. DTI = 47% → likely denied or requires a larger down payment or higher rate.
What lenders do with a high DTI
- Deny pre-approval.
- Approve with higher rates and stricter terms.
- Require bigger down payment, mortgage insurance, or proof of reserves.
Practical actions to lower your DTI before applying (do these now)
- Pay down high-interest credit cards — they count at minimum payment, so reduce monthly obligation fast.
- Refinance or consolidate high monthly payments into one lower payment.
- Increase documented income: overtime, bonuses, second job, or add a qualified co-borrower.
- Delay big purchases or new credit (new loans raise DTI and trigger lender concerns).
- Shop lenders and mortgage products — longer amortization or lower rates reduce monthly payments.
- Save for a larger down payment — reduces mortgage size and monthly payment.
- Get organized: have pay stubs, tax returns, and bank statements ready to prove income.
Remember: DTI isn’t the only gatekeeper
Credit score, job stability, down payment, property type, and reserves matter. A slightly higher DTI can be overcome with strong credit, substantial down payment, or large cash reserves.
Straight talk: what to do next
Calculate your DTI now. If it’s under 36–40% you’re in a strong position. If higher, pick 1–2 actions above and execute for 60–90 days before applying.
Need help running the numbers and choosing the fastest route to approval? Contact Tony Sousa — local mortgage-savvy realtor ready to map a plan: tony@sousasells.ca | 416-477-2620 | https://www.sousasells.ca
Act now — lenders move fast. Reduce DTI, save thousands in interest, and get the home you want.
