Secondly, as the size of the loan decreases more and more of the property value (equity) belongs to you. So if you move home, you may well have a bigger deposit next time. And, lastly, if house prices fall, at least what you owe is also going down and this offers protection against 'negative equity', which occurs when the value of the property is less than the amount you owe on it. When this happened back in the late eighties and early nineties, many people lost their homes as they could no longer afford to make the mortgage payments, and were not particularly inclined to do so anyway, on a house that was worth nothing to them.