Certainly, the optimal moment to exchange security deposits for a down payment differs for each individual. But, if you're thinking of abandoning the landlord in favor of a mortgage, here are some things you should know to help you decide if you're ready to purchase a flat or continue renting. Before you start looking for a flat, decide where you want to reside. Before making a decision, consider factors like the schools you want your children to attend as well as the commute to and from work.