djandseb wrote:1. Is it possible to do this transfer with a declaration of trust if the property is not owned in joint names? (which I believe is our case since I’m sole owner with mortgage in my name – although we are a married couple)
Yes. You would decalre that you hold the property on trust for the benefit of each of you and your wife in proportion 1:99.
djandseb wrote:2. If so, can the mortgage (in my name) be considered as an expense to calculate her rental income? In which proportion (1%?)?
There are differing views on this forum around this point. In my view, no. If your wife is not a borrower then she cannot claim a deduction for any interest.