DSCR in Commercial Real Estate: How Debt Service Coverage Sizes Your Loan
Debt service coverage ratio (DSCR) is a property’s net operating income divided by its annual debt service, and it is the main test commercial lenders use to decide how much they will lend against an income property. A DSCR of 1.0 means the property’s income exactly covers its mortgage payments; anything below means it does not. Lenders require a cushion above 1.0, so DSCR effectively limits the loan an investor can obtain regardless of the price they are willing to pay. This guide is for Ontario investors and owners who want to understand how DSCR is calculated, how it sizes a loan, how it changes with interest rates and NOI, and how buyers and sellers should use it. All numerical examples are hypothetical.
The Formula
DSCR = net operating income ÷ annual debt service. NOI is effective gross income less operating expenses, before debt service and income tax. Annual debt service is the total of principal and interest payments on the mortgage over a year. For loans with interest-only periods, debt service in that period is lower, but lenders may test coverage on the amortizing payment as well. See how to calculate NOI.
A Hypothetical Example
The figures below are an arithmetic illustration only. The loan, rate and amortization are assumptions, not market data or lender terms. Suppose a property has NOI of $300,000 and a $3,250,000 loan on a 25-year amortization with monthly payments.
| Assumed interest rate | Annual debt service (approx.) | DSCR | Cash flow after debt service (approx.) |
|---|---|---|---|
| 4.5% | $216,800 | 1.38 | $83,200 |
| 5.5% | $239,500 | 1.25 | $60,500 |
| 6.5% | $263,300 | 1.14 | $36,700 |
| 7.5% | $288,200 | 1.04 | $11,800 |
The same property and the same loan amount go from comfortable coverage to almost no cushion as the assumed rate rises by three points. That is why lenders test loans at the actual rate and often also stress them.
How DSCR Sizes a Loan
Lenders work backwards from a required minimum DSCR to the largest loan the property can support. The maximum annual debt service is NOI divided by the required DSCR, and the maximum loan is that amount divided by the loan constant, which is annual debt service per dollar of loan. At the assumed 5.5% rate and 25-year amortization, the constant is about 7.37 cents per dollar of loan. With NOI of $300,000:
| Required minimum DSCR | Maximum loan (approx.) |
|---|---|
| 1.20 | $3,393,000 |
| 1.25 | $3,257,000 |
| 1.30 | $3,132,000 |
| 1.40 | $2,908,000 |
Each lender sets its own requirement, which depends on the property type, tenant quality, lease term, borrower and market conditions, and it is set out in the lender’s commitment. Ask your lender or mortgage broker what applies to your deal. The loan is normally also limited by a maximum loan-to-value ratio, so the amount the borrower can actually obtain is the lower of the two tests.
What Affects DSCR
- NOI: higher rents, lower vacancy and controlled expenses all improve DSCR. Lenders will use their own view of NOI, often more conservative than the seller’s, with vacancy, management and reserves included.
- Interest rate: a higher rate means higher debt service.
- Amortization: longer amortization lowers annual payments and raises DSCR; shorter amortization does the opposite.
- Loan amount: larger loans mean higher debt service.
- Lease profile: lenders may give more credit to long leases with strong tenants than to short or rolling ones.
Break-Even and Stress Testing
DSCR also shows how much room a property has. In the 5.5% example above, annual debt service is about $239,500 against NOI of $300,000, so NOI could fall by about 20% before coverage reaches 1.0. Investors should test what happens if vacancy rises, if a major tenant leaves, if expenses increase or if rates reset higher at renewal. Loans in Ontario commonly have terms shorter than the amortization, so refinancing risk is real: at renewal, the rate, lender requirements and property income may all differ from what they were at closing.
DSCR vs Other Measures
- Cap rate: measures NOI relative to price and ignores financing. See cap rate vs ROI.
- Cash-on-cash return: measures cash flow after debt service relative to the equity invested.
- Loan-to-value: the loan as a percentage of the property’s value.
- Debt yield: NOI divided by the loan amount, used by some lenders as another test.
A property can meet a DSCR test and still produce a weak return on equity, and vice versa. The measures answer different questions.
Practical Points for Buyers
- Ask lenders early what DSCR and loan-to-value they require for your property type.
- Build your own NOI conservatively, including vacancy, management and reserves, before relying on the seller’s figure.
- Model different rates, amortizations and NOI scenarios.
- Consider how the lease profile will look at loan renewal.
- Budget for lender fees, appraisals, environmental reports and legal costs.
See how to finance a commercial property in Ontario and CapRate.ca’s mortgage page.
Practical Points for Sellers
Buyers financing the purchase can pay only what their lender will support, so DSCR influences your buyer pool and price. Provide a well-supported NOI, current leases and records that a lender’s underwriter can verify, and you reduce the risk that a buyer’s financing is reduced late in the process.
Common Mistakes
- Sizing a loan on the seller’s NOI instead of the lender’s.
- Ignoring rate risk at renewal.
- Assuming interest-only payments reflect the property’s real coverage.
- Forgetting that lenders apply both DSCR and loan-to-value tests.
- Treating DSCR as a measure of return.
Frequently Asked Questions
What is a good DSCR?
It depends on the lender, property type and market conditions. Lenders set minimums in their commitments, and higher coverage gives more cushion.
What does a DSCR below 1.0 mean?
The property’s NOI does not cover its debt payments, so the owner must fund the shortfall from other sources.
How is DSCR different from cap rate?
Cap rate compares NOI with price and ignores financing. DSCR compares NOI with the loan payments.
Can I improve my DSCR?
You can raise NOI, reduce the loan amount, lengthen the amortization or negotiate a lower rate, subject to lender terms.
Do all lenders use the same DSCR?
No. Requirements vary by lender, property type, borrower and the specific deal.
What is a loan constant?
Annual debt service per dollar of loan, which depends on the interest rate and amortization.
Conclusion
DSCR determines how much a lender will advance against an income property and how much margin of safety the investment has. Investors who calculate it conservatively and stress it for changes in NOI and interest rates make better decisions, and sellers who help buyers’ lenders verify income support stronger pricing. Before acquiring a commercial property, investors should understand not only the asking price, but also the property’s income, leases, expenses, physical condition and future potential. CapRate.ca works with commercial property buyers and sellers across the GTA and Southern Ontario.
Sources and Further Reading
- Government of Ontario: Calculating land transfer tax
- Canada Revenue Agency: GST/HST Memorandum 19-4-1, Commercial Real Property Sales and Rentals
The figures in the tables are hypothetical illustrations, not market data, lender terms or financial advice. This article is general information and is not legal, tax, accounting or financial advice.
Before acquiring a commercial property, investors should understand the property’s income, leases, expenses and financing. CapRate.ca works with commercial property buyers and sellers across the GTA and Southern Ontario.
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