About one out of every five home loans at three big Canadian banks are now negatively amortizing, which happens when years get added to the payment term of the original loan because the monthly payments are no longer enough to cover anything but the interest.
An important caveat is your mortgage payment gets frozen for only a fixed term, then you have to renegotiate, which means it’s only fixed for now.
Rent can go up 10-15% in the same amount of time as that fixed mortgage. If there’s no rent control, it can go up much more than that.