I received a 0 % interest promotion with Best Buy for 18 months. It was explained to me that after 18 months, if the balance was not paid off I would start paying interest. It sounded like any normal credit card to me. It was NOT made clear that the interest would be charged on the entire original purchase at the end of 18 months. As such, I had gotten my balance from almost $ XXXX down to {$170.00} by the end of the XXXX month, and as it was XXXX time, I decided to pay the remaining balance off next month, as I had other purchases to make for the holidays ( in other stores ). I did not think it would be a big deal to wait to pay the last amount next month. Next thing I know I get hit with an interest charge just over {$400.00} on my Best Buy Card. They had sent out a notice before the final payment stating they were going to charge me interest, but did n't state how much or explain that it was interest on the entire original purchase. I had only made that XXXX purchase on the best buy card. I had not been delinquent in my payments in any way. What is the worst part is that I could have paid off the remaining {$170.00} at the time, but I was unaware of the severity of the impending interest charge, and chose to make other things a priority. Had I known I would not be in this situation. 
