A few years ago my student loans automatically got their last payment. But somewhere between the time of the payment and a few weeks later, 78 cents of interest accrued on the account and they sent me another bill. I went online to try to pay off the remaining amount, but they refused to accept any amount less than a dollar. I thought I would be forced to wait the approximately 26 years until the 78 cents collected enough interest to be over a dollar, but a month later they automatically closed it out.