<prompt> Human: Ive had times in the past where I paid more than the total balance on my credit card and I was simply credited that small amount onto my balance so my balance looked something like -15.35. I plan to pay off one of my better reward credit cards and use it every month for my basic expenses. However, to simplify the paying off, Id like to set it up so it auto-pays 500 a month, and just ensure I dont spend more than 500 a month. In this case, there will be times when I dont spend the full 500. My question is, is there a limit to how much beyond your balance can you pay? Im just trying to maximize the chance that I dont get an interest charge for waiting too long to pay the credit card.If you have any other suggestions for the notion of pay your credit card in full every month that avoids any interest, please share.  <response>: Eventually they will send you a refund. This is a really stupid idea. Just pay your statement in full every month. 