DSCR for Commercial Mortgages: What Lenders Want to See

Direct answer: Most commercial lenders in Canada want to see a debt service coverage ratio (DSCR) of at least 1.25 — meaning the property's net operating income covers its mortgage payment with 25% room to spare. Some lenders will go as low as 1.10–1.15 on stronger properties or stronger borrowers, and alternative/private lenders can work with ratios below that, usually at a higher rate or lower loan-to-value.

What is DSCR, and why does it matter more than your personal income?

Debt service coverage ratio measures whether a property can pay for itself. Lenders divide the property's annual net operating income (NOI) by its annual mortgage payment (principal and interest, sometimes interest-only depending on the product):

DSCR	What it means
Below 1.00	Property doesn't generate enough income to cover the mortgage payment on its own
1.00–1.24	Covers the payment, but with little or no cushion
1.25+	Generally considered the benchmark most institutional commercial lenders look for
1.40+	Strong — often unlocks better pricing or higher leverage

This is the core difference between residential and commercial underwriting. On a residential file, your personal income and credit history carry most of the qualifying weight. On a commercial file, the property itself is the applicant in a very real sense — the lender is primarily asking whether the rent roll or business revenue generated by that property can service the debt, independent of what else is going on in your personal finances.

How do lenders calculate DSCR?

The formula is simple; the inputs are where deals get won or lost:

DSCR = Net Operating Income ÷ Annual Debt Service

Net operating income is gross rental or business income, minus operating expenses — but before the mortgage payment itself and before non-cash items like amortization. Expenses typically include property taxes, insurance, utilities, repairs and maintenance, management fees, and a vacancy allowance. What it does not include is the borrower's personal expenses or unrelated business costs, which is why a clean, well-documented set of financials (or a clear rent roll with lease terms) makes such a difference in how a lender sizes the deal.

Annual debt service is the total of principal and interest payments over a year at the rate and amortization being proposed — which is also why a longer amortization or an interest-only structure can sometimes move a marginal DSCR into qualifying range, even though the loan amount hasn't changed.

Illustration of property income balanced against debt obligations representing debt service coverage ratio calculation — DSCR is a balance: income the property actually generates, weighed against the debt it's being asked to carry.

What's considered a "good" DSCR for a commercial mortgage in Canada?

There's no single number that applies across every lender and asset class, but as a general guide:

Multi-unit residential / apartment buildings: often qualify down to 1.10–1.20 with institutional and CMHC-insured lenders, given the stability of residential rent rolls.
Retail, office, and industrial: usually need 1.25+ given more variable lease structures and tenant risk.
Owner-occupied commercial / business-for-self properties: lenders may blend DSCR with business financials, since the "tenant" and the owner are the same entity.
Hospitality and single-tenant specialty properties: typically held to a higher bar given concentration risk.

A one-and-done appraisal number isn't the full picture either — lenders will also want a trailing 12-month income statement, current leases or a rent roll, and often a pro-forma if there's been a recent change in occupancy or rents.

What happens when your DSCR falls short?

A DSCR under what an institutional lender needs doesn't automatically mean a deal is dead — it means the deal needs to be structured differently. A few common paths:

Lower the loan amount: reducing leverage directly improves the ratio, since annual debt service drops.
Extend the amortization: stretching payments over a longer period lowers the annual debt service figure without changing the loan amount.
Move to an alternative or private lender: many of the lenders I work with will underwrite to a lower DSCR than the big institutions, in exchange for a higher rate, a lower loan-to-value, or additional security — useful for newly stabilized properties, value-add situations, or properties still ramping up to full occupancy.
Add a personal guarantee or additional collateral: this can offset a thinner ratio for a lender who's otherwise comfortable with the asset and the sponsor.

This is exactly where running one file against a broad lender shelf pays off — a DSCR that gets declined outright at one institution can still fit comfortably inside another lender's guidelines, or be restructured to fit, without the borrower having to shop the deal around themselves.

Not sure where your deal lands?

Every commercial lender weighs DSCR a little differently, and the right structure often makes a marginal ratio work. Send over the basics on your property and I'll tell you straight where it stands.

Calculate Your DSCR

How is DSCR different from residential GDS/TDS qualifying?

Residential lenders use GDS (gross debt service) and TDS (total debt service) ratios, which measure a borrower's personal income against their housing costs and other debts. Commercial DSCR flips the lens onto the property's income against its own debt. The practical effect: a borrower with modest personal income but a strongly performing commercial property can qualify on the strength of the asset, while a borrower with excellent personal income but a property that doesn't cash flow may still be declined or need the deal restructured — the ratios are answering two different questions.

Illustration of one structured commercial mortgage deal unlocking multiple lending paths — A thin DSCR is usually a structuring question, not a dead end.

Frequently Asked Questions

What is a DSCR loan?

A DSCR loan is commercial financing where qualification is based primarily on the property's net operating income relative to its debt payments, rather than the borrower's personal income. It's the standard underwriting approach for income-producing commercial and multi-unit residential properties in Canada.

What DSCR do I need to qualify for a commercial mortgage?

Most institutional commercial lenders want a DSCR of at least 1.25, meaning the property's income covers the mortgage payment with 25% to spare. Multi-unit residential properties can sometimes qualify lower, around 1.10–1.20, while alternative and private lenders may accept lower ratios in exchange for a higher rate or lower leverage.

Can I get a commercial mortgage with a low DSCR?

Yes, in many cases. A lower DSCR usually means the deal needs to be restructured — a smaller loan amount, a longer amortization, additional security, or a lender further down the alternative/private spectrum — rather than being an automatic decline.

Does DSCR apply to residential rental properties too?

It can. Some lenders use DSCR-style underwriting for larger rental portfolios or properties held in a corporation, especially once a borrower moves beyond a handful of conventionally financed rental units.

What DSCR Do You Need to Qualify for a Commercial Mortgage?