From what I know, income from a job is not considered if you plan on leaving you job in order to buy the house. You will need to have jobs (or promise of emplyment) in Alberta in order to have income in the eyes of the mortgage lender. Not sure how maternity leave fits in all that, but from my guess since it's a temporary income it won't be considered. (I am not a financial advisor, bought a house in Quebec last year and did a bit of research)