Add-back and offset both blend a rental treatment into the borrower's overall GDS and TDS. Debt service coverage ratio (DSCR) lending asks a narrower question about the property itself: does its net operating income cover its own debt payment, judged largely on its own terms rather than folded into the borrower's personal ratios.
DSCR is net operating income (rent, minus realistic operating costs — not the mortgage payment itself) divided by the annual debt service on the property. A DSCR of 1.00 means the property's income exactly matches its payment. Above 1.00 is a cushion; below 1.00 means the property doesn't fully pay for itself and the borrower has to fund the gap from other resources.
Mainstream insured and insurable 1-to-4-unit rental lending in Canada mostly runs on add-back or offset through the borrower's personal GDS/TDS, not DSCR. DSCR-style qualifying is far more common with B lenders and private or alternative lenders financing rental portfolios, and it becomes the default logic once financing moves into genuinely commercial scale — properties of five units or more. See B-Lender & Alternative Underwriting for how alternative lenders use it, and Commercial Mortgage Underwriting for the 5+ unit territory this course does not cover.
For an investor with several properties, re-running the borrower's entire personal income and debt picture every time a new property is added gets unwieldy fast. A DSCR test isolates each property's own economics instead, which scales much more cleanly as the number of properties grows — a theme this course returns to in Module 09.
DSCR-qualified financing generally sits with lenders who charge a premium — in rate, fee, or both — for the flexibility of qualifying primarily on the property rather than the person. That premium varies by lender and isn't something to quote as a fixed number here; the fair way to frame it for a client is that it's a real trade-off, not automatically cheaper or easier than a conventional add-back or offset file for a borrower whose personal income already supports the debt.
A rental property has a DSCR of 0.92. What does that tell you?
Anything below 1.00 means the property doesn't fully pay for itself — the borrower is subsidizing the shortfall, not necessarily disqualified because of it. The "ineligible under any circumstances" option is the tempting overreaction; a DSCR under 1.00 is a data point some lenders will still work with if the borrower's outside income realistically covers the gap, not an automatic wall.
The intro and first module are free to read. Add your name and email once and the rest of this course opens — along with every other course on the site. No card, no trial.
Already unlocked on another device?
