
Originally Posted by
Ksandra
What happens is when you run your card sometimes the transaction is listed as pending and could take a day or two to go through. (Gas stations are notorious for this fyi.) So while that money doesn't get counted, it "thinks" you have money, but once all those pending payments finally go through, you get overdrafted. Banks make billions of dollars a year doing this (I shit you not, this is one of their main sources of money.)
There really is no reason to not get overdraft protection as the fees are smaller.
^
If this is your first time overdrafting (or you haven't done it in awhile) they will often reverse it. I'd call them instead of going to an actual bank as banking centers take a hit towards their monthly goals whenever they reverse fees, so they are usually less inclined to do them.