My wife and I are buying an investment/vacation property. As such we're looking at rates in the 4.25 - 4.5%. The lender mentioned a loan where we only pay 5% down and the PMI is paid by the lender that results in the 4.5% rate instead of the 4.25% on the normal 20% down. We itemize as Cali state taxes are silly high. I ran an analysis assuming we keep the other 15% in the market and it returns 8% annually, and it seems like a slam dunk to keep the extra 15% to earn a higher interest rate than the loan amount. It also frees up more liquidity in the case of emergencies or potentially buying a house here in the city if I get hit by a truck or find a suitcase full of money. Is there something I'm missing?