Rental suite qualifier
See an illustrative debt-service sketch with and without a rent offset. You type the payment, the market rent, and the percent of rent to test. A legal suite and the lender's program decide whether any rent counts.
Any rate or payment mentioned is illustrative and on approved credit (OAC). It is not a quote, a commitment, or a current offer. You may qualify with a legal suite's rent included the way the program allows, subject to lender and insurer approval.
Enter income, the mortgage payment, tax, heat, other debts, market rent, and an offset percent. Nothing is prefilled.
A basement apartment or a secondary suite can change a mortgage file, and it can also be irrelevant to the file. The difference is whether the unit is legal and whether the program the lender is using is allowed to count any of the rent. This page lets you type your gross annual income, the mortgage payment, monthly tax, monthly heat, other monthly debts, the market rent, and the percentage of that rent you want to test as an offset. It then shows an illustrative debt-service sketch with the offset and without it. It does not decide that the suite qualifies. It does not fill in a rate.
Start with the unit, not the rent. A legal secondary suite is a self-contained place to live: its own kitchen, its own bathroom, and usually its own entrance, allowed by the municipality. A room with a lock and a hot plate is not that unit. A suite that was finished without permits is a common GTA fact, and it is not income in the mortgage file. You may qualify with the rent included the way the program allows, subject to lender and insurer approval. You do not qualify by describing the rent and skipping the permit question.
Programs that do count rent rarely count all of it. A lender may use a percentage of market rent as an offset against the payment, or it may add a percentage of the rent to income. Those are different formulas that can land in a similar place, and they are not interchangeable on a commitment. This calculator uses the offset method because it is the one you can see: you type the percent, it multiplies the rent, and it subtracts that amount from the housing costs before the ratios are calculated. If a lender adds rent to income instead, this page is only a rough cousin of their math.
The percent box is yours. It starts empty. People ask for a standard, and the honest answer is that the standard is the program. Some owner-occupied insured files have used a large share of market rent from a legal suite, and some conventional files use less, or none, until a lease and an appraisal support it. Type the percent the lender already told you, or type more than one percent on separate passes so you can see how sensitive the sketch is. Do not type 100 because you collect 100. Vacancy, repairs, and the lender's haircut are why the offset exists.
Market rent is not the rent you hope to charge a relative. It is the rent a similar legal unit would obtain, and an appraiser or the lender's form is what supports it. A lease you wrote last week to a family member, at a number chosen for the application, is the kind of document that gets the rent removed. If you do not have a supportable rent, leave the sketch at zero offset and underwrite the house on your income alone. The house has to carry itself when the suite is empty.
The ratios on this page are the same illustrations used on the required-income calculator: housing costs against about 39 percent of gross monthly income, and housing plus other debts against about 44 percent. They are ceilings you can compare, not a decision. With the offset, housing costs drop by the rent amount you allowed. Without it, they do not. If the sketch fits only with the offset, the file depends on the lender accepting the suite. If it fits without the offset, the suite is a cushion rather than the reason the mortgage exists. That second version is the sturdier file.
Owner-occupied matters. The programs that are generous with a basement suite are usually for a borrower who lives in the building, in one or two units, not for a house you will never occupy. CMHC's insured self-employed program, for example, is aimed at owner-occupied properties of one to two units, up to 95 percent loan-to-value, with the equity structured as 5 percent of the first $500,000 and 10 percent of the rest. A stated-income program such as Sagen BFS Alt A is a different product, currently around 90 percent loan-to-value, and it still wants the income documents. A pure rental, where you do not live there, is an investment-property mortgage. Use that service page, not this sketch, as the description of the file.
Laneway suites, garden suites, and multiplexes are the Toronto version of the same question. A laneway suite is a second unit on the lot. A multiplex is more than one unit in the building. The North York office sees these on Toronto purchases, and Etobicoke houses show up in the same conversation. The rule does not change because the unit is new: it is in the file when it is legal, and the rent is in the file when the program can use it. A brand-new laneway suite with no lease yet is a market-rent question for the appraiser, not a number you invent in this box.
Brampton and Vaughan files often involve a separate-entrance basement in a freehold house. Woodbridge resales and Brampton towns are full of them. The neighbourhood does not make the suite legal. The permit, the zoning, and the way the unit was built do. If the listing says 'income potential' and does not say permitted, assume the rent is not in the mortgage until someone proves it. The illustrative examples on the city pages are labelled as examples for that reason.
Heat, tax, and the mortgage payment are typed by you so this page stays away from inventing a rate. If you do not yet have a payment, use the payment calculator or the required-income page to sketch one from a rate you were actually offered, then paste the payment here. Do not type a payment from a rate you wish a lender would post. The offset is only as honest as the payment underneath it. A payment that is too low makes both ratios look fine and wastes the afternoon.
Other debts still count. A suite does not pay the car loan. Total debt service uses the housing costs after the offset, plus the other payments you typed. If the rent offset fixes the housing ratio and the total ratio is still over the sketch ceiling, the suite was not the constraint. Paying down a debt, or leaving it out only because you plan to, is a conversation for the file, not a blank box.
Insurance and liability sit outside the calculator and inside the purchase. A legal suite can change the home insurance, and a lender wants the insurance to match the use. A suite you did not disclose to the insurer is a problem even when the mortgage offset was allowed. Tell the insurer the truth about the unit. The mortgage broker is not the insurer.
What to gather if the with-offset column is the one that works. Proof the unit is legal, a rent number you can defend, the listing or the appraisal instruction, your income documents, and the debts. Bring them to the same review as the agreement of purchase and sale. The first call is free. The lender and, where the mortgage is insured, the insurer decide whether any of the rent is used. This page only shows the arithmetic of a percent you were willing to type, next to the arithmetic of using none of it.
