ImmoMulti — a direct buyer of plex and multi-unit properties on the North Shore — relies on two ratios to read an income property at a glance: the cap rate (capitalization rate) and the GRM (gross rent multiplier). Knowing how to read the cap rate and the GRM lets you judge a listing in seconds: the GRM serves as a quick filter, the cap rate confirms the real return after expenses. This guide explains how to calculate each one with a worked example, how to use them together, the typical North Shore ranges in 2026, and the mistakes that artificially inflate a return.
Cap Rate and GRM: Which Questions Do These Two Ratios Answer?
The GRM answers "how much am I paying per dollar of gross rent?" (price ÷ gross rents). The cap rate answers "how much does the property earn me net, after expenses?" (NOI ÷ price). The GRM is a quick filter that ignores expenses; the cap rate is the honest measure of return. You read them together to evaluate a plex or multi-unit property.
To calculate the return of a multi-unit property, two numbers serve as the starting point:
- Gross rents: the sum of annual rents, plus ancillary income (parking, laundry, storage).
- Net operating income (NOI): income minus operating expenses (taxes, insurance, energy, maintenance, management, vacancy), excluding the mortgage.
The GRM is built on the first number, the cap rate on the second. That is the whole difference: the GRM looks only at the "top" of the income statement, the cap rate looks at the "bottom." Mastering these two income property ratios is enough to filter the vast majority of listings.
How to Read the Cap Rate (Capitalization Rate)?
The cap rate = net operating income ÷ price × 100. A 6% cap rate means the property generates CA$6 of net income for every CA$100 of price, before financing. The higher the cap rate, the greater the net return per dollar invested — but a very high cap rate often reflects a riskier area or property condition.
The cap rate is the reference indicator for evaluating an income property. It is the ratio of net income to price:
Take a triplex listed at CA$650,000, with CA$39,000 of annual NOI. The calculation gives 39,000 ÷ 650,000 × 100 = 6.0%. You read this figure as a rate of return: at equal price, a property at 6% earns more net than a property at 4.5%.
What a "good" cap rate means
A high cap rate means more net income per dollar of price — but rarely for free. A cap rate of 7% or more often comes with a less desirable area, fragile rents or a property in need of renovation. A low cap rate (4% or less) reflects, by contrast, a sought-after location, solid leases and little perceived risk. The cap rate of a plex is therefore as much a measure of return as it is a measure of risk.
Cap rate and value: the inverse mechanics
The cap rate also lets you estimate a value. If the market "pays" 6% for a given type of property, an NOI of CA$48,000 implies a value of roughly 48,000 ÷ 0.06 = CA$800,000. Raising the NOI by CA$6,000 (rent increases, expense optimization) adds, at constant cap rate, CA$100,000 of value. This is the central lever of value creation in multi-unit real estate.
Sensitivity to interest rates
The cap rate is never read in a vacuum: it partly tracks the interest-rate curve. When the policy rate rises, financing a property costs more, so buyers demand a higher cap rate to compensate — which pushes prices down at constant NOI. Conversely, when rates fall, cap rates compress and prices rise. In 2026, it is precisely this sensitivity that explains why North Shore cap rates have eased slightly compared with the lows of the rock-bottom-rate years.
How to Read the GRM (Gross Rent Multiplier)?
The GRM = purchase price ÷ annual gross rents. A property at CA$650,000 generating CA$54,000 in gross rents has a GRM of 12.0. The lower the GRM, the faster the property is "paid off" by its rents. It is a quick sorting filter, but it completely ignores operating expenses, which is why the cap rate is a useful complement.
The GRM (gross rent multiplier), the English equivalent of the Quebec MRB, is the quickest ratio to calculate:
Going back to the CA$650,000 triplex with CA$54,000 in gross rents: 650,000 ÷ 54,000 = 12.0. You read this figure as the number of years of gross rents needed to "match" the price. A GRM of 12 is more favourable to the buyer than a GRM of 14 on comparable properties.
Its strength: speed
The GRM requires only two figures that are often available right in the listing: the asking price and the gross rents. It is the perfect tool to immediately rule out an apparent bargain, or to compare a list of properties before digging into detailed financial statements.
Its limit: it ignores expenses
The GRM is blind to expenses. Two properties with the same GRM can have opposite returns if one has owner-paid taxes and heating and the other does not. An "all-inclusive" property with a GRM of 11 can be less profitable than a "net" property with a GRM of 13. That is precisely why you never stop at the GRM: you then move on to the cap rate, which incorporates expenses.
What About the NIM (Net Income Multiplier)?
The NIM = price ÷ net operating income. It is the mathematical inverse of the cap rate: a NIM of 16.7 equals a cap rate of 6% (1 ÷ 0.06). The NIM expresses in years of NOI what the cap rate expresses as a percentage. Some analysts prefer it to the GRM because it accounts for expenses, like the cap rate.
For completeness, let's mention a third ratio: the NIM (net income multiplier). It is calculated like the GRM, but from net income rather than gross:
On the CA$650,000 triplex with CA$39,000 of NOI: 650,000 ÷ 39,000 = 16.7. And 1 ÷ 16.7 ≈ 6.0%: exactly the cap rate calculated above. The NIM and the cap rate therefore say the same thing in two forms — one in "years," the other in "percentage." The NIM fixes the GRM's main weakness (it accounts for expenses), but it remains less common than the cap rate in conversations between investors.
How to Use the Cap Rate and the GRM Together?
Read the GRM first to quickly rule out a property that is too expensive for its rents, then the cap rate to confirm the real return after expenses. Two properties with the same GRM can have opposite cap rates depending on their expense structure; two properties with the same cap rate can have different GRMs depending on who pays the energy bill. Read together, the two ratios give a reliable picture.
Here is the concrete sequence on the same triplex at CA$650,000:
| Figure | Value |
|---|---|
| Annual gross rents | CA$54,000 |
| Operating expenses (≈ 28%) | CA$15,000 |
| Net operating income (NOI) | CA$39,000 |
| GRM | 650,000 ÷ 54,000 = 12.0 |
| Cap rate | 39,000 ÷ 650,000 = 6.0% |
| NIM | 650,000 ÷ 39,000 = 16.7 |
A GRM of 12 and a cap rate of 6% are both consistent with a North Shore area in 2026: the property is neither a bargain nor a trap. If the GRM had been 12 but the cap rate only 4%, you would know that expenses are "eating" the return — a warning sign invisible to the GRM alone. Conversely, a high GRM with a good cap rate can indicate a "net" property where the owner pays few expenses. Our deal analyzer computes these ratios at once and delivers an instant verdict, and the capital gains calculator rounds out the analysis on the resale side.
The golden rule: always start from real figures
The GRM and the cap rate are only as good as their inputs. Before calculating, verify the lease rents, the signed leases and the actual financial statements — not the advertised "potential." A nice ratio built on optimistic figures protects no one.
Which Cap Rate and GRM Ranges Should You Target on the North Shore?
On the North Shore in 2026: typical GRMs run from 9 to 14 (lower = better income-to-price ratio) and healthy cap rates sit between 5% and 6.5% depending on the city, size and condition of the property. Below a 4.5% cap rate, the property is expensive for its net income; above 7%, the high return often reflects greater risk.
| Ratio | Prudent benchmark (North Shore, 2026) |
|---|---|
| GRM | 9 to 14 — the lower, the better |
| Cap rate | 5% to 6.5% depending on area and condition |
| NIM | 15 to 20 (equivalent to a cap rate of 5%–6.7%) |
These ranges vary from one city to another: the same property will not show the same cap rate in Laval, Terrebonne, Blainville or Saint-Jérôme, because prices and demand differ. Always compare properties within the same market. To place a price by area, market data on median plex prices across the North Shore gives useful benchmarks before you calculate your ratios.
Which Mistakes Most Often Distort the Cap Rate and the GRM?
Three mistakes come up constantly: confusing gross rents with net income in the formula, ignoring vacancy and bad debt, and using outdated rents (theoretical potential instead of actual lease rents). Each one artificially inflates the displayed return and leads to overpaying for a property.
- Confusing gross and net. Calculating a "cap rate" from gross rents produces a falsely high figure. The cap rate always starts from NOI, after expenses; the GRM always starts from gross. Mixing the two is the most costly mistake.
- Ignoring vacancy and bad debt. A property is never rented at 100% all year. Subtracting a realistic allowance (often 2% to 5%) before calculating NOI avoids an overly optimistic cap rate.
- Using outdated or "potential" rents. Many listings show the "market" rent rather than the actual lease rent. In Quebec, you cannot raise rents at will: calculate on actual rents, not potential.
- Forgetting expenses. Management (even if you manage it yourself), caretaking, major maintenance (roof, windows) and contingencies are often missing from the seller's figures. Omitting them inflates the NOI — and therefore the cap rate.
- Comparing properties in different markets. A cap rate of 5.5% does not mean the same thing in a prime area and a fragile one. Compare properties with comparable structures and areas.
By avoiding these traps, the cap rate and the GRM become reliable tools to calculate the return of a multi-unit property in a few minutes. The key is to always calculate before making an offer — and to validate the real figures with the financial statements, an inspector and, if needed, an accountant. Our tools are informational and help you understand the mechanics of return, not replace due diligence.
