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Front-end and back-end DTI for Canada and the US — educational only.
Canada & US DTI rules Free
Debt-to-income (DTI) for mortgage planning — amounts in CAD or USD depending on your situation.
Enter income in the same currency you use for monthly debts.
Back-end DTI
21.2%
Excellent
Front-end DTI
21.2%
Excellent
Housing only ÷ gross monthly income.
Total monthly debts
$1,500
Includes housing plus all debt fields.
Back-end DTI scale (0–60%+)
Marker shows your back-end DTI (21.2%). Zones: ≤36% excellent · 37–43% acceptable · 44–49% high · ≥50% too high.
Lender benchmarks
Educational estimate only — lenders use verified income, credit reports, and underwriting overlays not captured here.
Your debt-to-income ratio compares what you owe each month to what you earn before taxes. It is one of the first filters lenders use because it summarizes whether you have enough room in your budget for a new mortgage payment after your existing obligations. A lower DTI generally means a safer borrower profile, while a high DTI suggests that even a small income disruption or rate change could strain payments.
Front-end DTI (sometimes called the housing ratio) looks only at housing—rent or proposed mortgage payment, and sometimes related items—relative to gross monthly income. Back-end DTI adds other recurring debts such as car loans, student loans, and credit card minimums. Underwriting systems evaluate both because you can pass the housing check while still failing overall if other debts consume too much of your paycheque.
In Canada, insured mortgage guidelines emphasize the Gross Debt Service (GDS) and Total Debt Service (TDS) caps—commonly 39% for housing costs and 44% for all debts as a share of gross income, alongside the federal stress test. In the United States, conventional loans often reference similar ideas with typical front-end guidance near the high twenties and back-end limits around 43–45%, though investor overlays and loan programs vary. Your broker or bank will apply the exact policy that applies to your file.
Improving DTI is rarely instant, but it is straightforward: pay down balances that carry high minimum payments, avoid new financing before a mortgage application, document stable income, and consider a larger down payment to reduce the loan amount and monthly payment. Use this calculator as a directional check, not a commitment letter—always confirm results with a licensed professional.
This tool provides estimates for education only. Lenders may use different definitions of income and debt, and approval depends on credit, employment, property, and program rules.
A DTI below 36% is considered excellent by most lenders. Between 37–43% is acceptable for mortgage qualification. Above 44% makes approval difficult, and above 50% will disqualify you from most conventional loans.
Canadian lenders use GDS (39% limit) and TDS (44% limit) ratios. Your total debt service ratio must be 44% or below to qualify for a mortgage with most lenders.
Front-end DTI (housing ratio) includes only your housing costs divided by income. Back-end DTI includes all monthly debt payments. Lenders look at both — front-end limit is typically 28–31%, back-end is 43–45%.
You can lower your DTI by paying down existing debts, increasing your income, avoiding new debt before applying for a mortgage, or making a larger down payment to reduce the required mortgage amount.
Yes. A lower DTI signals less risk to lenders and can result in better mortgage rates. Borrowers with DTI above 43% may face higher rates or require mortgage insurance.