It compares net worth, not payments. “$2,500 rent or a $2,500 mortgage payment” is the wrong comparison: part of a mortgage payment is principal, which you keep, and the down payment is money that could have been invested instead.
Both households start with the same cash: what the buyer needs to close. The renter invests it. The buyer spends it on the down payment, deed transfer tax and closing costs. Each month, each pays for housing. Whoever pays less has savings left over, and you choose whether those are kept, invested or spent.
- Renter’s net worth = investments + any savings kept.
- Owner’s net worth = home value − mortgage owing − selling costs − any prepayment penalty + any savings kept.
Opportunity cost. A down payment isn’t a cost the way rent is: you get it back in equity. But it stops earning anything else. On the default $66,462 at 5% a year, that forgone growth is about $41,798 over 10 years. That’s the number buying has to beat.
Principal is not an expense. The calculator keeps principal, interest, tax, insurance, maintenance and condo fees apart. In the first year of the default example, $978 of the $4,003 a month is principal.
Break-even is the first point after which buying stays ahead of renting through 30 years, worked out month by month as if you sold then. It is calculated from your inputs, never assumed.
Outside Halifax. Most rent vs buy calculators in Canada use a national land transfer tax and ignore local rents. Pick your municipality and it works as a rent vs buy calculator for Nova Scotia anywhere: the deed transfer tax changes with it, and you enter your own rent, price and property tax.
Mortgage payments compound semi-annually, as Canadian fixed-rate mortgages do (Interest Act, s.6), the same formula as our payment calculator.