If I buy a home with less than 20% down, my understanding is that it generally has to be my primary residence. How long does it have to be my primary residence? Until I have 20% equity? For context, we are considering buying a second home and living there for awhile (while renting out our first home) and then returning to the first home after a few years. (We have a genuine interest in living there while our child is young, it’s not just a financial decision- it’s in a vacation town a couple hours away.) Are there other better strategies for financing the second home, like a HELOC on our first home, or something like that? We have about 30% equity in our first home and the two homes are around $300-$350k each.