Buying a home is one of the biggest decisions you may make in your life time. Granted, it seems these days people tend to make that same big decision every five years or so. Still, it has significant effects on your finances. If you buy a home and sell it five years later, the interest rate pretty much equals the cost of rent. One way to lower that interest rate, or rent if you sell eventually, is to buy down home loan points. These vary regarding cost and how many you can buy down. An average cost is one point equals 1% of your total loan.