House-hacking refers to buying a multifamily property on an owner-occupied mortgage, living in one unit and renting the others.  If you're thinking about becoming a rental mogul, starting early is an advantage.  Not only will you have longer to accumulate a larger portfolio, but you can also increase the leverage on the first owner-occupied acquisitions.  Leverage is the use of other people's money to finance an investment.  The higher the loan-to-value, the greater the leverage which can increase the yield.  The lower down payment gives the investor more leverage which can increase the return on their investment.  FHA, VA, Fannie Mae, and Freddie Mac each have programs for buying o…