Glossary
Gross Rent Multiplier
The gross rent multiplier is a property's price divided by its gross annual rent, giving a fast screen for comparing income properties..
The gross rent multiplier (GRM) is a property's price divided by its gross annual rental income, expressed as a number of years. A GRM of 15 means the asking price equals roughly 15 years of rent collected before any expenses. Investors use it as a quick first screen, not a final valuation.
How the calculation works
The formula is GRM = property price ÷ gross annual rent, where gross annual rent is the monthly rent multiplied by twelve. For illustration, a property priced at $500,000 with rent of $2,500 a month has gross annual rent of $30,000 and a GRM of about 16.7. Buyers can also reverse the maths: dividing the price by a target GRM gives the rent the property would need to produce to meet that screen.
A lower GRM means less price per dollar of rent. That is generally viewed as more attractive, but it can also reflect a weaker rental market, an older building, or heavy operating costs.
What the gross rent multiplier leaves out
Because it uses gross rent, GRM ignores nearly everything that determines whether a property actually pays for itself:
- Vacancy and credit loss
- Property tax, insurance, maintenance, and strata fees
- Mortgage payments, interest rate, and amortization
- Capital repairs and future rent growth
Two buildings with identical GRMs can produce very different cash flow. For that reason GRM is best treated as a filter that decides which properties deserve a closer look.
Why it matters to a Canadian borrower
Lenders do not generally qualify a mortgage on GRM. For a rental purchase they look at rental income qualification, often applying a rental offset to the subject property's rent and then testing the file against GDS and TDS ratios under OSFI Guideline B-20 for federally regulated lenders. Larger or commercial-style properties may instead be assessed on debt service coverage and capitalization rate.
That gap matters: a property can look cheap on GRM and still fail a lender's affordability test once taxes, heating, and other debt are counted. Use GRM to narrow a shortlist, then confirm the numbers with a lender or broker before removing conditions on an offer.
Frequently asked questions
What is a good gross rent multiplier?
There is no single benchmark that applies across Canada. A reasonable GRM depends on the local market, property type, and prevailing interest rates, and it shifts over time. Because GRM ignores expenses and financing, compare it only against similar properties in the same market, and confirm current local data rather than relying on a rule of thumb.
How do you calculate gross rent multiplier?
Divide the property's price by its gross annual rent. Gross annual rent is the monthly rent multiplied by twelve. The result tells you how many years of rent would equal the purchase price. Some investors run the same calculation on market rent rather than the rent currently being charged.
Is gross rent multiplier the same as cap rate?
No. The capitalization rate uses net operating income, which subtracts operating expenses from rent, while GRM uses gross rent and no expenses at all. Cap rate is generally more informative for valuation, but GRM is faster and needs less information, so it is often used first to screen listings.
Sources
Related terms
- Capitalization Rate — A property's net operating income divided by its value or purchase price, expressed as a percentage, used to compare income-producing real estate.
- Cash Flow — Cash flow is the money left from a rental property's rent after the mortgage payment and operating costs are paid each month.
- Rental Income Qualification — Rental income qualification is the share of rent a lender will actually count as income when assessing your Canadian mortgage application.
- Rental Offset — Rental offset is the rental income from a suite or second unit that a lender counts toward a borrower's income when qualifying for a mortgage.
- Debt Service Coverage — Debt service coverage is a lender's measure of whether a property's income is enough to cover its mortgage payments, used mainly in rental and commercial lending.