The debt coverage ratio (DCR) — also called DSCR — is the first number any lender looks at before financing an income property. It answers a simple question: does the building's income cover the mortgage, with a safety margin? Understanding how it is calculated, what threshold you need to hit and how to improve it can make the difference between an approved loan and a declined file. Here is the DCR explained from A to Z, with a worked example for a multi-unit property.
What is the debt coverage ratio (DCR)?
The DCR measures an income property's ability to repay its debt from its own income. It compares net operating income (NOI) to annual debt service (principal plus interest). The higher the ratio, the larger the safety margin for both the lender and the owner.
The debt coverage ratio is a financial-strength indicator. A DCR of 1.25 means that for every dollar of mortgage payment, the property generates $1.25 of net income — a 25% cushion above the payments. Conversely, a DCR of 0.90 means income covers only 90% of the payments: the owner has to make up the rest out of pocket.
Unlike the capitalization rate (cap rate) or the gross rent multiplier (GRM), which mainly help estimate a building's value, the DCR is about its ability to repay. That is why it sits at the heart of every lender's analysis and every mortgage-insurance program.
The DCR formula and its two parts
DCR = Net operating income (NOI) ÷ Debt service. NOI is effective gross income minus operating expenses, before the mortgage. Debt service is the annual sum of principal and interest payments.
The formula is short, but each part deserves precision:
- Net operating income (NOI) = potential gross income − vacancy and bad-debt allowance − operating expenses (municipal and school taxes, insurance, maintenance, management, common-area utilities, snow removal). It excludes both the mortgage and tax depreciation.
- Debt service = the annual total of mortgage payments, principal and interest combined (12 monthly payments, for instance).
The golden rule
The mortgage payment belongs only in the denominator (debt service). Never subtract it from NOI in the numerator: otherwise you count the debt twice and understate your ratio.
Worked example: the DCR of a 6-plex, step by step
Take a 6-unit building whose annual income and expenses look like this. We start from gross income, compute NOI, then divide it by debt service.
| Line item | Annual amount |
|---|---|
| Potential gross income (6 units) | $84,000 |
| Less: vacancy and bad debt (4%) | − $3,360 |
| Effective gross income | $80,640 |
| Less: operating expenses (taxes, insurance, maintenance, management, utilities) | − $20,640 |
| Net operating income (NOI) | $60,000 |
| Annual debt service (principal + interest) | $48,000 |
| DCR = $60,000 ÷ $48,000 | 1.25 |
This 6-plex posts a DCR of 1.25: for every dollar of mortgage payment, it generates $1.25 of net income. That is a comfortable ratio, clearing most lenders' thresholds. If debt service rose to $55,000 (higher rate or shorter amortization), the DCR would fall to 1.09 — below several thresholds, and financing would become harder to obtain.
What DCR do lenders require?
Most conventional lenders require a minimum DCR of 1.10 to 1.30, with 1.20-1.25 very common for a multi-unit property. For CMHC mortgage insurance on a conventional building, the minimum debt service coverage ratio is generally around 1.10.
The exact threshold varies with the lender, the property type, its location and the program used:
| Financing context | Typical minimum DCR |
|---|---|
| Conventional lender — small multi-unit | 1.20 to 1.30 |
| Commercial loan — 5+ units | 1.20 to 1.25 |
| CMHC — conventional multi-unit mortgage insurance | 1.10 (min.) |
| CMHC MLI Select — highly affordable projects | May be lowered below 1.10 |
These figures are indicative. CMHC states that, for its standard multi-unit loans, it applies a minimum debt service coverage ratio, and that the MLI Select program can ease certain criteria for projects combining affordability, energy efficiency and accessibility. Always confirm the exact requirements with your lender and check the official parameters on the CMHC website before building your structure.
Sources: CMHC — MLI Select program and CMHC — Multi-unit mortgage loan insurance.
5 ways to improve your multi-unit DCR
The DCR depends on two variables: NOI (raise it) and debt service (lower it). Here are five concrete levers.
- Raise NOI. Adjust rents within the Tribunal administratif du logement (TAL) guidelines and cut avoidable expenses. Every extra dollar of NOI lifts the numerator directly.
- Extend amortization. Moving from 25 to 30 years (or more, where eligible) reduces the annual payment and thus debt service in the denominator.
- Increase the down payment. Borrowing less mechanically reduces payments and improves the ratio.
- Negotiate a better rate or refinance. A lower interest rate lightens debt service. Compare scenarios before committing.
- Add ancillary income. Laundry, parking, storage: this income raises NOI without increasing base rent.
Common mistakes to avoid
Watch out
A miscalculated DCR can sink a financing at the last moment.
- Forgetting the vacancy allowance. A "fully leased" income with no allowance (3% to 5%) overstates NOI. The lender will deduct it anyway.
- Underestimating expenses. Taxes, insurance, maintenance, management: a lender normalizes expenses even if you self-manage. Use realistic figures.
- Subtracting the mortgage from NOI. The classic error: the payment goes in the denominator, never the numerator.
- Confusing DCR and cap rate. DCR depends on your financing; the cap rate depends on price and income. They are complementary, not interchangeable.
Master the DCR and you speak your lender's language — and you know, before you even file an application, whether your project holds up. If you are weighing whether to sell or refinance your plex, this ratio is often the starting point. For a full read on returns, pair it with a multi-unit yield calculation and an eye on current mortgage rates.
Frequently asked questions
The debt coverage ratio (DCR), also called DSCR, measures an income property's ability to repay its debt from its own income. It is calculated by dividing net operating income (NOI) by annual debt service (principal plus interest). A DCR of 1.25 means the property generates $1.25 of net income for every $1 of mortgage payment.
DCR = Net operating income (NOI) ÷ Debt service. NOI is effective gross income minus operating expenses (property and school taxes, insurance, maintenance, management, common-area utilities), excluding the mortgage and depreciation. Debt service is the annual total of principal and interest payments. Example: an NOI of $60,000 divided by debt service of $48,000 gives a DCR of 1.25.
Most conventional lenders require a minimum DCR of 1.10 to 1.30, with 1.20 to 1.25 very common. CMHC uses a minimum debt service coverage ratio of about 1.10 for conventional multi-unit mortgage insurance; the MLI Select program can lower that threshold for highly affordable projects. Always confirm the exact requirements with your lender and program.
DCR measures the safety margin between net income and debt payments; it matters most to the lender. The capitalization rate (cap rate) relates NOI to the price paid and is used to estimate value. The gross rent multiplier (GRM) relates price to gross income. DCR depends on your financing (rate, amortization, down payment), whereas cap rate and GRM depend mostly on price and income.
A DCR below 1.0 means net operating income does not cover debt service: the property runs at a deficit and the owner must cover the shortfall from other income. Lenders generally refuse to finance, or refinance, a property below 1.0, and often below their 1.10-1.25 threshold. A DCR under 1 signals negative cash flow that should be fixed before any financing application.
Five main levers: 1) raise NOI by increasing rents within the TAL guidelines and cutting expenses; 2) extend the amortization period to reduce the annual payment; 3) increase the down payment to borrow less; 4) negotiate a better interest rate or refinance; 5) add ancillary income (laundry, parking, storage). Every extra dollar of NOI or reduced debt service lifts the ratio.
DCR uses net operating income (NOI), meaning income BEFORE the mortgage payment and before tax depreciation. The mortgage appears only in the denominator, within debt service. Never subtract mortgage interest from NOI in the numerator, or you count the debt twice and distort the ratio.
Yes. A lender computes NOI from effective gross income, that is potential income minus a vacancy and bad-debt allowance (often 3% to 5% depending on the market), then subtracts normalized operating expenses. Using a fully-leased income with no allowance overstates NOI and produces a misleading DCR the lender will adjust downward.
DCR too tight? ImmoMulti gives you an exit
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