Dennis Eckert:

Special financing offers have been around for years. One type works by offering you, the customer, no interest on a purchase if you pay off the balance before the promotional period ends. This can be a good deal, so long as you do pay off your purchase before the promotional period ends.
 
 The issue is that, if you haven’t paid off the balance of your purchase by the time the grace period ends – let’s say that’s 12 months, for example – you may be stuck with a pile of interest that was building up during that time. So, even if you have just a fraction of the purchase price left to pay on day 366, you could owe 12 months’ worth of interest based on the balance. That means your wallet could take a significant hit.
 
 The reality is most people’s lives are anything but predictable, and paying off a purchase within a set period of time doesn’t always happen as planned. We have responsibilities that weigh on us – tasks and relationships to juggle and, of course, a never-ending stack of bills to pay.