Do you want to pay your mortgage off quicker and save thousands of dollars in interest over the life of your loan? Okay—that sounded a little bit like an infomercial, but really, if you want to pay your mortgage off ahead of schedule, and therefore cut down on the interest you pay, there’s a simple trick to help you do just that: Pay a little more on your mortgage each month. You can do this by rounding up to the nearest hundred with every monthly payment.