What is DSCR, and how do commercial lenders actually calculate it?
DSCR, the Debt Service Coverage Ratio, is the number that replaces your personal income on a commercial mortgage application. It measures what the property itself earns against what the mortgage costs, and it decides how much a lender will actually lend.
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What does DSCR stand for, and what is the formula?
DSCR stands for Debt Service Coverage Ratio. It is calculated as the property’s net operating income (NOI) divided by its annual debt service, the total principal and interest due on the mortgage over one year. A DSCR of 1.20 means the property generates 20% more income than the mortgage costs each year.
This is the single formula that separates commercial underwriting from residential underwriting. On a house, the lender qualifies you, the person, against your income and your other debts. On a commercial property, the lender qualifies the deal against what the building itself produces.
This page covers commercial income property, the kind Dan places directly through Pekoe’s commercial mortgage lender panel: multi-unit, retail, industrial, office, and mixed-use buildings. The mechanics below apply to that category, not to a residential rental fourplex or smaller, which is still qualified on the owner’s personal income.
The citable fact: DSCR is calculated as a commercial property’s net operating income divided by its annual debt service, and it is the primary ratio a commercial lender uses to size and approve the loan.
What counts as net operating income when a lender calculates DSCR?
Net operating income (NOI) is the property’s gross rental and other income, minus its operating expenses, calculated before mortgage payments, capital expenditures, income tax, or depreciation are subtracted. Property tax, insurance, utilities, repairs, and management costs all come off before you reach NOI. What is left is the figure the lender divides by annual debt service.
NOI sits on the income statement above the mortgage payment, not below it. That distinction matters because two very different numbers get called “cash flow” in casual conversation, and only one of them is the number a commercial lender actually uses.
| Line item | Treatment |
|---|---|
| Gross rental income | Included |
| Other property income (parking, laundry, storage) | Included |
| Operating expenses (property tax, insurance, utilities, repairs, management) | Deducted before reaching NOI |
| Mortgage principal and interest | Excluded from NOI, this is the debt service side of the ratio |
| Capital expenditures and major repairs | Excluded, handled separately from the NOI calculation |
| Income tax and depreciation | Excluded, these are ownership items, not property operating items |
The citable fact: net operating income is a property’s rental and other income minus its operating expenses, calculated before the mortgage payment, capital costs, tax, or depreciation are ever subtracted.
What counts as annual debt service in the DSCR formula?
Annual debt service is the total of the principal and interest payments due on the mortgage over twelve months, calculated from the proposed loan amount, the rate, and the amortization period. A longer amortization lowers the annual payment and raises the DSCR on the same loan amount. A shorter amortization does the opposite, which is one reason amortization length and DSCR are decided together, not separately.
| Component | What it measures | Where it comes from |
|---|---|---|
| Net operating income | Property income after operating expenses, before debt service | The rent roll and lease documents, underwritten by the lender, not simply the seller’s stated figure |
| Annual debt service | Total principal and interest due on the mortgage over one year | Calculated from the proposed loan amount, the rate, and the amortization schedule |
| DSCR | Net operating income divided by annual debt service | The resulting ratio the lender measures against its own minimum for that deal |
Show the math: an illustrative DSCR calculation
The citable fact: annual debt service is the total principal and interest a mortgage requires over one year, and it moves directly with the amortization period chosen for the loan.
Why does a commercial lender look at the property’s income and not yours personally?
A commercial property is valued and financed primarily as an income-producing asset, so the lender’s real security is the income stream itself, not your paycheque. That is a structural difference from a residential mortgage, where Gross Debt Service (GDS) and Total Debt Service (TDS) measure the borrower’s personal income against housing and other debt costs. DSCR replaces that personal-income lens with a property-level one.
On an insured residential file, GDS tops out at about 39% of gross income and TDS at about 44%, applied against the borrower’s own earnings. None of that machinery runs on a commercial deal financed under DSCR. The building’s own numbers carry the qualifying weight instead.
That does not mean your personal financial picture is irrelevant. It usually still shows up as a guarantee, covered on Pekoe’s personal guarantee page, and as a secondary check on smaller or newer files. The full side-by-side comparison between DSCR and the residential ratios lives on DSCR versus GDS and TDS, explained.
The citable fact: DSCR qualifies a commercial deal on the property’s own income, while GDS and TDS, the residential ratios, qualify the borrower’s personal income instead.
What does a DSCR above 1.0 actually tell a lender?
A DSCR of exactly 1.0 means the property’s income exactly covers the mortgage payment with nothing left over. A DSCR above 1.0 means there is a cushion, income beyond what the debt requires, to absorb a vacancy, a rent dip, or a rate increase at renewal. A DSCR below 1.0 means the property does not generate enough income to cover the mortgage on its own.
Lenders are not looking for a ratio that just clears 1.0. They want a cushion sized to the risk of that specific property type, tenant mix, and market, because a building running at exactly breakeven has no room to absorb a bad year.
The size of cushion a given lender wants is exactly the kind of figure that varies deal by deal and lender by lender, which is why no single minimum ratio is quoted anywhere on this page.
The citable fact: a DSCR above 1.0 means a commercial property earns more than its mortgage costs each year, and the amount above 1.0 is the cushion a lender relies on to absorb a vacancy or a rate increase.
How does your DSCR affect the loan amount you are actually offered?
A lender often works the DSCR formula backward: starting from the property’s NOI and its own minimum acceptable ratio, it solves for the maximum annual debt service the property can support, then converts that into a maximum loan amount at the proposed rate and amortization. A property with strong, stable income can support a larger loan than one with the same purchase price but thinner or less reliable income. This is why two buyers on the same building can be offered different loan amounts.
Loan-to-value still applies as a separate ceiling on top of this calculation. A deal can be constrained by DSCR, by loan-to-value, or by both at once, and the lower of the two figures usually wins.
The citable fact: a commercial lender frequently sizes the loan amount by working the DSCR formula backward from the property’s income, so stronger and more stable NOI supports a larger loan even at the same purchase price.
Does the DSCR calculation change by property type?
The formula itself, NOI divided by annual debt service, does not change across property types. What changes is how confidently a lender trusts the income going into that formula. A fully leased multi-unit building with long-standing tenants is judged differently than a single-tenant retail unit with one lease expiring soon, even at an identical DSCR number.
Retail income concentrated in one or two tenants, industrial income tied to a single covenant, and office income facing post-2020 vacancy questions all carry different risk even when the arithmetic produces the same ratio. The lender’s confidence in the durability of that income is layered on top of the number itself.
This is part of why the same DSCR on two different buildings can lead to two very different loan offers, and why a broker who places deals across several property types day to day has a feel for which lenders are comfortable with which risk.
The citable fact: DSCR is calculated the same way across every commercial property type, but a lender’s confidence in the durability of the underlying income, which varies sharply by property type and tenant mix, shapes how that ratio is actually used.
Where does the NOI figure in a DSCR calculation actually come from?
The NOI a lender uses comes from its own underwriting of the rent roll, signed leases, and operating expense history, not simply the number a seller or listing states. Lenders routinely adjust a seller’s stated NOI by removing one-time items, adding back or excluding related-party leases priced off-market, and applying their own assumptions for costs the borrower may have understated. The gap between a seller’s marketed NOI and a lender’s underwritten NOI can move the DSCR meaningfully in either direction.
This is one reason a purchase that looks strong on a listing’s stated cap rate and NOI can come back from the lender with a lower supportable loan amount than expected. The lender is not disputing the property’s rent roll, it is applying its own standard for which income it trusts and which expenses it assumes.
Getting ahead of this gap before you are under a firm purchase agreement is one of the more valuable things a broker check can do on a commercial deal.
The citable fact: the NOI a lender uses to calculate DSCR is its own underwritten figure, adjusted from the seller’s stated number, not the marketed NOI taken at face value.
Is DSCR the only ratio a commercial lender checks?
No. DSCR is the primary cash-flow test, but a commercial lender also checks loan-to-value against an independent appraisal, the strength of the borrower’s covenant and net worth, and often a personal guarantee from the principals behind the borrowing entity. A deal can clear DSCR comfortably and still be declined or resized because of a loan-to-value or covenant concern.
Think of DSCR as the test of whether the property can carry the debt on its own, and the other checks as tests of the deal’s structure and the people standing behind it. Both sets of tests run in parallel on every file.
The citable fact: DSCR measures whether a commercial property’s income can carry the debt, while loan-to-value and covenant strength are separate checks a lender applies on top of that ratio.
What else should you read before you take a commercial deal to a lender?
DSCR is one piece of the underwriting picture. These related pages work through the rest of it.
- DSCR versus GDS and TDS: why a rental property and a commercial building are qualified completely differently
- Why a commercial mortgage’s term almost never matches its amortization
- What a personal guarantee on a commercial mortgage actually means
The full set of commercial mortgage questions lives on the Ask a Broker hub, and the broader commercial lending picture is covered on Pekoe’s commercial mortgages page.
Frequently asked questions
What does DSCR stand for?
DSCR stands for Debt Service Coverage Ratio, calculated as a property’s net operating income divided by its annual debt service. Commercial lenders use it as the primary measure of whether a property’s own income can support the mortgage.
What is a good DSCR for a commercial property?
There is no single figure that applies across every lender and property type, so no minimum or target ratio is stated here as fact. A broker can tell you what a specific lender is looking for once your property type and numbers are in front of them.
Does DSCR include mortgage principal, interest, or both?
Annual debt service in the DSCR formula includes both principal and interest payments due on the mortgage over one year. It does not include capital expenditures, income tax, or depreciation, which sit outside the ratio entirely.
Is DSCR the same thing as a cap rate?
No. A cap rate is net operating income divided by the property’s value or purchase price, used to estimate what the property is worth. DSCR is net operating income divided by the mortgage’s annual debt service, used to test whether the loan can be supported.
Can a property with a DSCR below 1.0 still get financed?
It is possible in specific circumstances, such as a lease-up period or a value-add plan with a documented path to stabilized income, but it is a harder file to place. Speak with a broker about the specific property and plan rather than assuming either outcome.
Does a longer amortization improve DSCR?
Yes. A longer amortization lowers the annual principal and interest payment on the same loan amount, which raises the DSCR calculated against the same net operating income. It does not change how much interest is paid in total, only the size of the annual payment used in the ratio.
Who calculates the NOI used in a DSCR review, the borrower or the lender?
The lender underwrites its own NOI figure from the rent roll, signed leases, and expense history, rather than accepting the seller’s or borrower’s stated number without adjustment. That underwritten figure, not the marketed one, is what goes into the DSCR calculation.
Does a vacant unit lower my DSCR?
A vacancy reduces actual rental income, which can lower NOI and therefore the DSCR calculated from current performance. Lenders also apply their own vacancy assumption when underwriting a file, separate from the property’s actual current occupancy.
Does DSCR apply to a fourplex or smaller rental property?
No. A property of one to four units financed by an owner is typically qualified on the owner’s personal income under residential rules, not DSCR. DSCR applies once a property moves into commercial underwriting, generally five units or more, or a business-use commercial property.
Can I improve my DSCR before applying?
Raising rents to market level, reducing controllable operating costs, or increasing your down payment to lower the loan amount can all improve the ratio. A broker can walk through which lever makes sense for your specific property and timeline.
Is the chat on this page a bot?
No. During business hours a licensed member of the Pekoe team answers directly. Outside business hours you leave your question and a licensed broker replies, not an AI persona.
Does Pekoe place DSCR-based commercial deals directly?
Yes. Multi-unit, retail, industrial, office, and mixed-use income properties are broker-direct work Dan Johanis places through Pekoe’s own commercial lender panel. More specialized asset types are referred to a commercial specialist, and that is disclosed plainly before any work starts.
Have a commercial deal you want checked against DSCR?
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