A useful rent-versus-buy comparison does not place rent beside the full mortgage payment and stop. Mortgage principal builds equity, while mortgage interest, property tax, insurance, maintenance, condo fees, and transaction costs are ownership costs that may not be recovered.
Renting also has more than one cost, and it can leave cash available to invest. A fair model tracks both paths over the same time horizon and makes the uncertain assumptions visible.
Build the buying side
Enter the purchase price, down payment, rate, amortization, property tax, insurance, condo or association fees, maintenance, and expected selling cost. The model reduces the mortgage balance as principal is paid and applies the entered home-value growth rate.
At each year, buy net position equals modeled home value minus remaining mortgage and selling costs. This is not spendable cash unless the home is sold or equity is borrowed, and the result excludes tax or transaction details not entered.
Build the renting and investing side
Enter current rent and rent growth. Cash available today that is not used as a down payment begins on the renting side, and positive monthly differences between modeled ownership cost and rent are added to the investment balance.
The investment return is uncertain and may have fees and taxes. Test lower returns, and do not assume every renter will consistently invest the difference. The purpose is to expose opportunity cost, not to promise a portfolio outcome.
Interpret the break-even horizon
Review the difference at every year, not only the final result. Transaction costs often make a short ownership period less attractive, while a longer stay gives principal repayment and any home growth more time to accumulate. A small modeled lead can reverse after a minor assumption change.
The financial result is not the entire decision. Stability, control of the space, repair responsibility, mobility, job uncertainty, family plans, and access to cash can matter more than a narrow projected difference.
Use local data without confusing it with a forecast
For Toronto, Montréal, Edmonton, or another city, begin with the rent and purchase options actually available to you. National posted mortgage rates are useful benchmarks, but negotiated offers depend on the borrower, property, term, insurance, and lender rather than the city name alone.
Update the scenario when a written mortgage quote, target property, rent renewal, condo fee, tax bill, or inspection changes. A current local input is more useful than a confident long-range growth assumption.
Frequently asked questions
Is renting always worse because it builds no equity?
No. Owners also pay interest, tax, insurance, maintenance, and transaction costs, while renters may keep and invest more liquid cash.
What time horizon should I use?
Use the period you realistically expect to remain in the property, then compare shorter and longer cases because transaction costs make timing important.
Does a rent-versus-buy calculator predict home prices?
No. Home growth, rent growth, maintenance, selling costs, and investment returns are editable assumptions, not forecasts.
Sources and further reading
Mortgage rules and market data can change. Follow the links for current official information.